• Java最全文件操作实例汇总

    本文实例汇总了Java文件操作。分享给大家供大家参考，具体如下：

    1.创建文件夹

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    //import java.io.*;
    File myFolderPath = new File(%%1);
    try {
    if (!myFolderPath.exists()) {
    myFolderPath.mkdir();
    }
    }
    catch (Exception e) {
    System.out.println("新建目录操作出错");
    e.printStackTrace();
    }

    2.创建文件

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    //import java.io.*;
    File myFilePath = new File(%%1);
    try {
    if (!myFilePath.exists()) {
    myFilePath.createNewFile();
    }
    FileWriter resultFile = new FileWriter(myFilePath);
    PrintWriter myFile = new PrintWriter(resultFile);
    myFile.println(%%2);
    resultFile.close();
    }
    catch (Exception e) {
    System.out.println("新建文件操作出错");
    e.printStackTrace();
    }

    3.删除文件

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    //import java.io.*;
    File myDelFile = new File(%%1);
    try {
    myDelFile.delete();
    }
    catch (Exception e) {
    System.out.println("删除文件操作出错");
    e.printStackTrace();
    }

    4.删除文件夹

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    //import java.io.*;
    File delFolderPath = new File(%%1);
    try {
    delFolderPath.delete(); //删除空文件夹
    }
    catch (Exception e) {
    System.out.println("删除文件夹操作出错");
    e.printStackTrace();
    }

    5.删除一个文件下夹所有的文件夹

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    //import java.io.*;
    File delfile=new File(%%1);
    File[] files=delfile.listFiles();
    for(int i=0;i<files.length;i++){
    if(files[i].isDirectory()){
    files[i].delete();
    }
    }

    6.清空文件夹

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    //import java.io.*;
    File delfilefolder=new File(%%1);
    try {
    if (!delfilefolder.exists()) {
    delfilefolder.delete();
    }
    delfilefolder.mkdir();
    }
    catch (Exception e) {
    System.out.println("清空目录操作出错");
    e.printStackTrace();
    }

    7.读取文件

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    //import java.io.*;
    // 逐行读取数据
    FileReader fr = new FileReader(%%1);
    BufferedReader br = new BufferedReader(fr);
    String %%2 = br.readLine();
    while (%%2 != null) {
    %%3
    %%2 = br.readLine();
    }
    br.close();
    fr.close();

    8.写入文件

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    //import java.io.*;
    // 将数据写入文件
    try {
    FileWriter fw = new FileWriter(%%1);
    fw.write(%%2);
    fw.flush();
    fw.close();
    } catch (IOException e) {
    e.printStackTrace();
    }

    9.写入随机文件

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    //import java.io.*;
    try {
    RandomAcessFile logFile=new RandomAcessFile(%%1,"rw");
    long lg=logFile.length();
    logFile.seek(%%2);
    logFile.writeByte(%%3);
    }catch(IOException ioe){
    System.out.println("无法写入文件："+ioe.getMessage());
    }

    10.读取文件属性

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    //import java.io.*;
    // 文件属性的取得
    File af = new File(%%1);
    if (af.exists()) {
    System.out.println(f.getName() + "的属性如下： 文件长度为：" + f.length());
    System.out.println(f.isFile() ? "是文件" : "不是文件");
    System.out.println(f.isDirectory() ? "是目录" : "不是目录");
    System.out.println(f.canRead() ? "可读取" : "不");
    System.out.println(f.canWrite() ? "是隐藏文件" : "");
    System.out.println("文件夹的最后修改日期为：" + new Date(f.lastModified()));
    } else {
    System.out.println(f.getName() + "的属性如下：");
    System.out.println(f.isFile() ? "是文件" : "不是文件");
    System.out.println(f.isDirectory() ? "是目录" : "不是目录");
    System.out.println(f.canRead() ? "可读取" : "不");
    System.out.println(f.canWrite() ? "是隐藏文件" : "");
    System.out.println("文件的最后修改日期为：" + new Date(f.lastModified()));
    }
    if(f.canRead()){
    %%2
    }
    if(f.canWrite()){
    %%3
    }

    11.写入属性

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    //import java.io.*;
    File filereadonly=new File(%%1);
    try {
    boolean b=filereadonly.setReadOnly();
    }
    catch (Exception e) {
    System.out.println("拒绝写访问："+e.printStackTrace());
    }

    12.枚举一个文件夹中的所有文件

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    //import java.io.*;
    //import java.util.*;
    LinkedList<String> folderList = new LinkedList<String>();
    folderList.add(%%1);
    while (folderList.size() > 0) {
    File file = new File(folderList.peek());
    folderList.removeLast();
    File[] files = file.listFiles();
    ArrayList<File> fileList = new ArrayList<File>();
    for (int i = 0; i < files.length; i++) {
    if (files[i].isDirectory()) {
    folderList.add(files[i].getPath());
    } else {
    fileList.add(files[i]);
    }
    }
    for (File f : fileList) {
    %%2=f.getAbsoluteFile();
    %%3
    }
    }

    13.复制文件夹

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    //import java.io.*;
    //import java.util.*;
    LinkedList<String> folderList = new LinkedList<String>();
    folderList.add(%%1);
    LinkedList<String> folderList2 = new LinkedList<String>();
    folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("//")));
    while (folderList.size() > 0) {
    (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹
    File folders = new File(folderList.peek());
    String[] file = folders.list();
    File temp = null;
    try {
    for (int i = 0; i < file.length; i++) {
    if (folderList.peek().endsWith(File.separator)) {
    temp = new File(folderList.peek() + File.separator
    + file[i]);
    } else {
    temp = new File(folderList.peek() + File.separator
    + file[i]);
    }
    if (temp.isFile()) {
    FileInputStream input = new FileInputStream(temp);
    FileOutputStream output = new FileOutputStream(
    folderList2.peek() + File.separator
    + (temp.getName()).toString());
    byte[] b = new byte[5120];
    int len;
    while ((len = input.read(b)) != -1) {
    output.write(b, 0, len);
    }
    output.flush();
    output.close();
    input.close();
    }
    if (temp.isDirectory()) {// 如果是子文件夹
    for (File f : temp.listFiles()) {
    if (f.isDirectory()) {
    folderList.add(f.getPath());
    folderList2.add(folderList2.peek()
    + File.separator + f.getName());
    }
    }
    }
    }
    } catch (Exception e) {
    //System.out.println("复制整个文件夹内容操作出错");
    e.printStackTrace();
    }
    folderList.removeFirst();
    folderList2.removeFirst();
    }

    14.复制一个文件夹下所有的文件夹到另一个文件夹下

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    //import java.io.*;
    //import java.util.*;
    File copyfolders=new File(%%1);
    File[] copyfoldersList=copyfolders.listFiles();
    for(int k=0;k<copyfoldersList.length;k++){
    if(copyfoldersList[k].isDirectory()){
    ArrayList<String>folderList=new ArrayList<String>();
    folderList.add(copyfoldersList[k].getPath());
    ArrayList<String>folderList2=new ArrayList<String>();
    folderList2.add(%%2+"/"+copyfoldersList[k].getName());
    for(int j=0;j<folderList.length;j++){
    (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
    File folders=new File(folderList.get(j));
    String[] file=folders.list();
    File temp=null;
    try {
    for (int i = 0; i < file.length; i++) {
    if(folderList.get(j).endsWith(File.separator)){
    temp=new File(folderList.get(j)+"/"+file[i]);
    }
    else{
    temp=new File(folderList.get(j)+"/"+File.separator+file[i]);
    }
    FileInputStream input = new FileInputStream(temp);
    if(temp.isFile()){
    FileInputStream input = new FileInputStream(temp);
    FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" +
    (temp.getName()).toString());
    byte[] b = new byte[5120];
    int len;
    while ( (len = input.read(b)) != -1) {
    output.write(b, 0, len);
    }
    output.flush();
    output.close();
    input.close();
    }
    if(temp.isDirectory()){//如果是子文件夹
    folderList.add(folderList.get(j)+"/"+file[i]);
    folderList2.add(folderList2.get(j)+"/"+file[i]);
    }
    }
    }
    catch (Exception e) {
    System.out.println("复制整个文件夹内容操作出错");
    e.printStackTrace();
    }
    }
    }
    }

    15.移动文件夹

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    //import java.io.*;
    //import java.util.*;
    LinkedList<String> folderList = new LinkedList<String>();
    folderList.add(%%1);
    LinkedList<String> folderList2 = new LinkedList<String>();
    folderList2.add(%%2 + %%1.substring(%%1.lastIndexOf("//")));
    while (folderList.size() > 0) {
    (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹
    File folders = new File(folderList.peek());
    String[] file = folders.list();
    File temp = null;
    try {
    for (int i = 0; i < file.length; i++) {
    if (folderList.peek().endsWith(File.separator)) {
    temp = new File(folderList.peek() + File.separator
    + file[i]);
    } else {
    temp = new File(folderList.peek() + File.separator
    + file[i]);
    }
    if (temp.isFile()) {
    FileInputStream input = new FileInputStream(temp);
    FileOutputStream output = new FileOutputStream(
    folderList2.peek() + File.separator
    + (temp.getName()).toString());
    byte[] b = new byte[5120];
    int len;
    while ((len = input.read(b)) != -1) {
    output.write(b, 0, len);
    }
    output.flush();
    output.close();
    input.close();
    if (!temp.delete())
    System.out.println("删除单个文件操作出错!");
    }
    if (temp.isDirectory()) {// 如果是子文件夹
    for (File f : temp.listFiles()) {
    if (f.isDirectory()) {
    folderList.add(f.getPath());
    folderList2.add(folderList2.peek()
    + File.separator + f.getName());
    }
    }
    }
    }
    } catch (Exception e) {
    // System.out.println("复制整个文件夹内容操作出错");
    e.printStackTrace();
    }
    folderList.removeFirst();
    folderList2.removeFirst();
    }
    File f = new File(%%1);
    if (!f.delete()) {
    for (File file : f.listFiles()) {
    if (file.list().length == 0) {
    System.out.println(file.getPath());
    file.delete();
    }
    }
    }

    16.移动一个文件夹下所有的文件夹到另一个目录下

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    //import java.io.*;
    //import java.util.*;
    File movefolders=new File(%%1);
    File[] movefoldersList=movefolders.listFiles();
    for(int k=0;k<movefoldersList.length;k++){
    if(movefoldersList[k].isDirectory()){
    ArrayList<String>folderList=new ArrayList<String>();
    folderList.add(movefoldersList[k].getPath());
    ArrayList<String>folderList2=new ArrayList<String>();
    folderList2.add(%%2+"/"+movefoldersList[k].getName());
    for(int j=0;j<folderList.length;j++){
    (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
    File folders=new File(folderList.get(j));
    String[] file=folders.list();
    File temp=null;
    try {
    for (int i = 0; i < file.length; i++) {
    if(folderList.get(j).endsWith(File.separator)){
    temp=new File(folderList.get(j)+"/"+file[i]);
    }
    else{
    temp=new File(folderList.get(j)+"/"+File.separator+file[i]);
    }
    FileInputStream input = new FileInputStream(temp);
    if(temp.isFile()){
    FileInputStream input = new FileInputStream(temp);
    FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" +
    (temp.getName()).toString());
    byte[] b = new byte[5120];
    int len;
    while ( (len = input.read(b)) != -1) {
    output.write(b, 0, len);
    }
    output.flush();
    output.close();
    input.close();
    temp.delete();
    }
    if(temp.isDirectory()){//如果是子文件夹
    folderList.add(folderList.get(j)+"/"+file[i]);
    folderList2.add(folderList2.get(j)+"/"+file[i]);
    }
    }
    }
    catch (Exception e) {
    System.out.println("复制整个文件夹内容操作出错");
    e.printStackTrace();
    }
    }
    movefoldersList[k].delete();
    }
    }

    17.以一个文件夹的框架在另一个目录创建文件夹和空文件

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    //import java.io.*;
    //import java.util.*;
    boolean b=false;//不创建空文件
    ArrayList<String>folderList=new ArrayList<String>();
    folderList.add(%%1);
    ArrayList<String>folderList2=new ArrayList<String>();
    folderList2.add(%%2);
    for(int j=0;j<folderList.length;j++){
    (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
    File folders=new File(folderList.get(j));
    String[] file=folders.list();
    File temp=null;
    try {
    for (int i = 0; i < file.length; i++) {
    if(folderList.get(j).endsWith(File.separator)){
    temp=new File(folderList.get(j)+"/"+file[i]);
    }
    else{
    temp=new File(folderList.get(j)+"/"+File.separator+file[i]);
    }
    FileInputStream input = new FileInputStream(temp);
    if(temp.isFile()){
    if (b) temp.createNewFile();
    }
    if(temp.isDirectory()){//如果是子文件夹
    folderList.add(folderList.get(j)+"/"+file[i]);
    folderList2.add(folderList2.get(j)+"/"+file[i]);
    }
    }
    }
    catch (Exception e) {
    System.out.println("复制整个文件夹内容操作出错");
    e.printStackTrace();
    }
    }

    18.复制文件

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    //import java.io.*;
    int bytesum = 0;
    int byteread = 0;
    File oldfile = new File(%%1);
    try {
    if (oldfile.exists()) { //文件存在时
    FileInputStream inStream = new FileInputStream(oldfile); //读入原文件
    FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
    byte[] buffer = new byte[5120];
    int length;
    while ( (byteread = inStream.read(buffer)) != -1) {
    bytesum += byteread; //字节数 文件大小
    System.out.println(bytesum);
    fs.write(buffer, 0, byteread);
    }
    inStream.close();
    }
    }
    catch (Exception e) {
    System.out.println("复制单个文件操作出错");
    e.printStackTrace();
    }

    19.复制一个文件夹下所有的文件到另一个目录

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    //import java.io.*;
    File copyfiles=new File(%%1);
    File[] files=copyfiles.listFiles();
    for(int i=0;i<files.length;i++){
    if(!files[i].isDirectory()){
    int bytesum = 0;
    int byteread = 0;
    try {
    InputStream inStream = new FileInputStream(files[i]); //读入原文件
    FileOutputStream fs = new FileOutputStream(new File(%%2,files[i].getName());
    byte[] buffer = new byte[5120];
    int length;
    while ( (byteread = inStream.read(buffer)) != -1) {
    bytesum += byteread; //字节数 文件大小
    System.out.println(bytesum);
    fs.write(buffer, 0, byteread);
    }
    inStream.close();
    } catch (Exception e) {
    System.out.println("复制单个文件操作出错");
    e.printStackTrace();
    }
    }
    }

    20.提取扩展名

    复制代码代码如下:
    String %%2=%%1.substring(%%1.lastIndexOf(".")+1);


    21.提取文件名 

    复制代码代码如下:
    String %%2=%%1.substring(%%1.lastIndexOf("//")+1);


    22.提取文件路径 

    复制代码代码如下:
    String %%2=%%1.substring(0,%%1.lastIndexOf("//"));


    23.替换扩展名

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    //import java.io.*;
    File replaceExt=new File(%%1);
    replaceExt.renameTo(replaceExt.getName().split(".")[0]+"."+%%2);

    24.追加路径

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    final String path=%%1.endsWith("//")?%%1:%%1+"//";
    %%3=path+%%2;

    25.移动文件

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    //import java.io.*;
    int bytesum = 0;
    int byteread = 0;
    File oldfile = new File(%%1);
    try {
    if (oldfile.exists()) { //文件存在时
    InputStream inStream = new FileInputStream(oldfile); //读入原文件
    FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
    byte[] buffer = new byte[5120];
    int length;
    while ( (byteread = inStream.read(buffer)) != -1) {
    bytesum += byteread; //字节数 文件大小
    //System.out.println(bytesum);
    fs.write(buffer, 0, byteread);
    }
    inStream.close();
    oldfile.delete();
    }
    }
    catch (Exception e) {
    System.out.println("复制单个文件操作出错");
    e.printStackTrace();
    }

    26.移动一个文件夹下所有文件到另一个目录

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    //import java.io.*;
    File movefile=new File(%%1);
    File[] movefiles=movefile.listFiles();
    for(int i=0;i<movefiles.length;i++){
    if(movefiles[i].isFile()){
    int bytesum = 0;
    int byteread = 0;
    File oldfile = new File(movefiles[i]);
    try {
    if (oldfile.exists()) { //文件存在时
    InputStream inStream = new FileInputStream(oldfile); //读入原文件
    FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
    byte[] buffer = new byte[5120];
    int length;
    while ( (byteread = inStream.read(buffer)) != -1) {
    bytesum += byteread; //字节数 文件大小
    //System.out.println(bytesum);
    fs.write(buffer, 0, byteread);
    }
    inStream.close();
    oldfile.delete();
    }
    }
    catch (Exception e) {
    System.out.println("复制单个文件操作出错");
    e.printStackTrace();
    }
    }
    }

    27.指定目录下搜索文件

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    //import java.io.*;
    String filter="*.*";
    String path=%%1;
    File file = new File(path);
    if(file.exists()) {
    if(file.isDirectory()) {
    File[] fileArray = file.listFiles();
    for(File f:fileArray) {
    if(f.isDirectory()) {
    doSearch(filter,f.getPath());
    } else {
    if(f.getName().indexOf(filter) >= 0) {
    countFiles++;
    result.append(f.getPath() + "/r/n");
    }
    }
    statusShow1.setText(f.getPath());
    }
    statusShow2.setText("The numbers of files had been found:" + countFiles);
    } else {
    System.out.println("Couldn't open the path!");
    }
    } else {
    System.out.println("The path had been apointed was not Exist!");
    }

    28.打开对话框

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    //import java.io.*;
    //import javax.swing.*;
    JFileChooser Jfc = new JFileChooser(); //建立选择档案对话方块盒 Jfc
    if (Jfc.isFileSelectionEnabled()) {
    File %%1 = Jfc.getSelectedFile();
    }

    29.文件分割

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    //import java.io.*
    try {
    File f=new File(%%1);
    FileInputStream fileInputStream = new FileInputStream(f);
    byte[] buffer = new byte[fileInputStream.available()];
    FileInputStream.read(buffer);
    fileInputStream.close();
    String strFileName = f.getName();
    FileOutputStream fileOutputStream = new FileOutputStream(new File(%%2+"//"+ strFileName + "1"));
    fileOutputStream.write(buffer,0,buffer.length/2);
    fileOutputStream.close();
    fileOutputStream = new FileOutputStream(new File(%%2+"//"+ strFileName + "2"));
    fileOutputStream.write(buffer, buffer.length/2, buffer.length-buffer.length/2);
    fileOutputStream.close();
    } catch (ArrayIndexOutOfBoundsException e) {
    System.out.print("using FileStreamDemo src des");
    e.printStackTrace();
    }
    catch(IOException e){
    e.printStackTrace();
    }

    30.文件合并

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    //import java.io.*
    String strFileName = %%1.substring(%%1.LastIndexOf("//") + 1);
    try {
    FileInputStream fileInputStream1 = new FileInputStream(new File(%%2 + strFileName + "1"));
    FileInputStream fileInputStream2 = new FileInputStream(new File(%%2 + strFileName + "2"));
    byte[] buffer = new byte[fileInputStream1.available()+fileInputStream2.available()];
    FileInputStream.read(buffer, 0, fileInputStream1.available());
    FileInputStream2.read(buffer, fileInputStream1.available(), fileInputStream2.available());
    fileInputStream.close();
    fileInputStream2.close();
    FileOutputStream fileOutputStream = new FileOutputStream(new File(%%2+"//"+ strFileName));
    fileOutputStream.write(buffer,0,buffer.length);
    fileOutputStream.close();
    catch(IOException e){
    e.printStackTrace();
    }

    31.文件简单加密

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    //import java.io.*
    try {
    File f=new File((new File(%%1)).getPath()+"//enc_"+(new File(%%1)).getName().split("//")[1]);
    String strFileName = f.getName();
    FileInputStream fileInputStream = new FileInputStream(%%2+"//"+strFilename);
    byte[] buffer = new byte[fileInputStream.available()];
    FileInputStream.read(buffer);
    fileInputStream.close();
    for(int i=0;i<buffer.length;i++)
    {
    int ibt=buffer[i];
    ibt+=100;
    ibt%=256;
    buffer[i]=(byte)ibt;
    }
    FileOutputStream fileOutputStream = new FileOutputStream(f);
    fileOutputStream.write(buffer,0,buffer.length);
    fileOutputStream.close();
    }
    catch(ArrayIndexOutOfBoundException e){
    e.printStackTrace();
    }
    catch(IOException e){
    e.printStackTrace();
    }

    32.文件简单解密

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    //import java.io.*
    try {
    File f=new File(%%1);
    String strFileName = f.getName();
    FileInputStream fileInputStream = new FileInputStream(%%2+"//enc_"+strFilename);
    byte[] buffer = new byte[fileInputStream.available()];
    FileInputStream.read(buffer);
    fileInputStream.close();
    for(int i=0;i<buffer.length;i++)
    {
    int ibt=buffer[i];
    ibt-=100;
    ibt+=256;
    ibt%=256;
    buffer[i]=(byte)ibt;
    }
    FileOutputStream fileOutputStream = new FileOutputStream(f);
    fileOutputStream.write(buffer,0,buffer.length);
    fileOutputStream.close();
    }
    catch(ArrayIndexOutOfBoundException e){
    e.printStackTrace();
    }
    catch(IOException e){
    e.printStackTrace();
    }

    33.写入ini文件属性

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    //import java.io.*;
    //import java.util.*;
    //import java.util.regex.*;
    if (configMap == null) {
    String WriteBuffer = "";
    configMap = new HashMap<String, Serializable>();
    String strLine = null;
    String currentNode = null;
    String previousNode = null;
    Vector<Properties> vec = new Vector<Properties>();
    int row = 0;
    FileReader fileReader = null;
    try {
    fileReader = new FileReader("Config.ini");
    } catch (FileNotFoundException e1) {
    e1.printStackTrace();
    }
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    try {
    while ((strLine = bufferedReader.readLine()) != null) {
    String oneLine = strLine.trim();
    if (oneLine.length() >= 1) {
    Pattern p = Pattern.compile("//[//s*.*//s*//]");
    int nodelen = oneLine.split("[;]").length;
    String[] strArray1 = new String[4];
    if (nodelen == 1) {
    oneLine = oneLine.split("[;]")[0].trim();
    } else if (nodelen == 2) {
    strArray1[3] = oneLine.split("[;]")[1].trim();
    oneLine = oneLine.split("[;]")[0].trim();
    }
    Matcher m = p.matcher(oneLine);
    if (m.matches()) {
    strArray1[0] = "@Node";
    strArray1[1] = oneLine;
    strArray1[2] = "";
    } else {
    int keylen = oneLine.split("=").length;
    if (keylen == 1) {
    strArray1[0] = "@Key";
    strArray1[1] = oneLine.split("=")[0];
    strArray1[2] = "";
    } else if (keylen == 2) {
    strArray1[0] = "@Key";
    strArray1[1] = oneLine.split("=")[0];
    strArray1[2] = oneLine.split("=")[1];
    } else {
    strArray1[0] = "@ElementError";
    strArray1[1] = "";
    strArray1[2] = "";
    strArray1[3] = "";
    }
    }
    if (strArray1[0].equals("@Node")) {
    previousNode = currentNode;
    currentNode = strArray1[1];
    if (row > 0) {
    configMap.put(previousNode, vec.elementAt(0));
    vec.clear();
    row = 0;
    }
    WriteBuffer += (oneLine + "/r/n");
    } else if (strArray1[0].equals("@Key") && row == 0) {
    Properties ht = new Properties();
    ht.setProperty(strArray1[1], strArray1[2]);
    if (strArray1[1].equals(%%1)) {
    WriteBuffer += (%%1+"=" + %%2 + "/r/n");
    } else
    WriteBuffer += (oneLine + "/r/n");
    vec.add(0, ht);
    row++;
    } else if (strArray1[0].equals("@Key") && row > 0) {
    Properties ht2 = new Properties();
    ht2.put(strArray1[1], strArray1[2]);
    vec.clear();
    vec.add(0, ht2);
    WriteBuffer += (oneLine + "/r/n");
    row++;
    }
    }
    }
    configMap.put(currentNode, vec.elementAt(0));
    } catch (FileNotFoundException e) {
    configMap = null;
    e.printStackTrace();
    } catch (IOException e) {
    configMap = null;
    e.printStackTrace();
    } finally {
    vec.clear();
    try {
    bufferedReader.close();
    fileReader.close();
    } catch (IOException e) {
    e.printStackTrace();
    }
    try {
    FileWriter fw = new FileWriter("Config.ini");
    fw.write(WriteBuffer);
    fw.flush();
    fw.close();
    } catch (IOException e) {
    e.printStackTrace();
    }
    }
    }

    34.读取ini文件属性

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    //import java.io.*;
    //import java.util.*;
    //import java.util.regex.*;
    //private HashMap configMap=null;
    private Map<String, Serializable> configMap=null;
    String %%2=null;
    if (configMap == null) {
    configMap = new HashMap<String, Serializable>();
    String strLine = null;
    String currentNode = null;
    String previousNode = null;
    Vector<Properties> vec = new Vector<Properties>();
    int row = 0;
    FileReader fileReader = null;
    try {
    fileReader = new FileReader("Config.ini");
    } catch (FileNotFoundException e1) {
    e1.printStackTrace();
    }
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    try {
    while ((strLine = bufferedReader.readLine()) != null) {
    String oneLine = strLine.trim();
    if (oneLine.length() >= 1) {
    Pattern p = Pattern.compile("//[//s*.*//s*//]");
    int nodelen = oneLine.split("[;]").length;
    String[] strArray1 = new String[4];
    if (nodelen == 1) {
    oneLine = oneLine.split("[;]")[0].trim();
    } else if (nodelen == 2) {
    strArray1[3] = oneLine.split("[;]")[1].trim();
    oneLine = oneLine.split("[;]")[0].trim();
    }
    Matcher m = p.matcher(oneLine);
    if (m.matches()) {
    strArray1[0] = "@Node";
    strArray1[1] = oneLine;
    strArray1[2] = "";
    } else {
    int keylen = oneLine.split("=").length;
    if (keylen == 1) {
    strArray1[0] = "@Key";
    strArray1[1] = oneLine.split("=")[0];
    strArray1[2] = "";
    } else if (keylen == 2) {
    strArray1[0] = "@Key";
    strArray1[1] = oneLine.split("=")[0];
    strArray1[2] = oneLine.split("=")[1];
    } else {
    strArray1[0] = "@ElementError";
    strArray1[1] = "";
    strArray1[2] = "";
    strArray1[3] = "";
    }
    }
    if (strArray1[0].equals("@Node")) {
    previousNode = currentNode;
    currentNode = strArray1[1];
    if (row > 0) {
    configMap.put(previousNode, vec.elementAt(0));
    vec.clear();
    row = 0;
    }
    } else if (strArray1[0].equals("@Key") && row == 0) {
    Properties ht = new Properties();
    ht.setProperty(strArray1[1], strArray1[2]);
    if(strArray1[1].equals(%%1))
    {
    %%2=strArray1[2];
    return;
    }
    vec.add(0, ht);
    row++;
    } else if (strArray1[0].equals("@Key") && row > 0) {
    Properties ht2 = new Properties();
    ht2.put(strArray1[1], strArray1[2]);
    vec.clear();
    vec.add(0, ht2);
    row++;
    }
    }
    }
    configMap.put(currentNode, vec.elementAt(0));
    } catch (FileNotFoundException e) {
    configMap = null;
    e.printStackTrace();
    } catch (IOException e) {
    configMap = null;
    e.printStackTrace();
    } finally {
    vec.clear();
    try {
    bufferedReader.close();
    fileReader.close();
    } catch (IOException e) {
    e.printStackTrace();
    }
    }
    }

    35.合并一个文件下所有的文件

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    File combinefiles=new File(%%1);
    File[] files=combinefiles.listFiles();
    FileOutputStream fs;
    try {
    fs=new FileOutputStream(new File(%%2));
    }
    catch(IOException e){
    e.printStackTrace();
    }
    for(int i=0;i<files.length;i++){
    if(files[i].isFile()){
    int bytesum=0;
    int byteread=0;
    try {
    FileInputStream inStream=new FileInputStream(files[i]);
    byte[] buffer = new byte[5120];
    int length;
    while((byteread=inStream.read(buffer))!=-1){
    bytesum+=byteread;
    fs.write(buffer,0,byteread);
    }
    inStream.close();
    }
    catch(Exception e){
    //复制文件出错
    e.printStackTrace();
    }
    }
    }
    try {
    fs.close();
    }
    catch(IOException e){
    {
    e.printStackTrace();
    }

    36.写入ini文件属性

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    //import java.io.*;
    //import java.util.*;
    //import java.util.regex.*;
    //private HashMap configMap=null;
    private Map<String, Serializable> configMap=null;
    if(configMap==null) {
    String strLine=null;
    String currentNode=null;
    String previousNode=null;
    Vector<Properties> vec=new Vector<Properties>();
    int row=0;
    FileReader fileReader = null;
    try {
    fileReader = new FileReader(%%1);
    } catch (FileNotFoundException e1) {
    e1.printStackTrace();
    }
    BufferedReader bufferedReader=new BufferedReader(fileReader);
    try {
    while((strLine=bufferedReader.readLine())!=null) {
    String oneLine=strLine.trim();
    if(oneLine.length()>=1) {
    Pattern p=Pattern.compile("//[//s*.*//s*//]");
    int nodelen=oneLine.split("[;]").length;
    String[] strArray1=new String[4];
    if(nodelen==1) {
    oneLine=oneLine.split("[;]")[0].trim();
    }
    else if(nodelen==2) {
    strArray1[3]=oneLine.split("[;]")[1].trim();
    oneLine=oneLine.split("[;]")[0].trim();
    }
    Matcher m=p.matcher(oneLine);
    if(m.matches()) {
    strArray1[0]="@Node";
    strArray1[1]=oneLine;
    strArray1[2]="";
    } else {
    int keylen=oneLine.split("=").length;
    if(keylen==1) {
    strArray1[0]="@Key";
    strArray1[1]=oneLine.split("=")[0];
    strArray1[2]="";
    } else if(keylen==2) {
    strArray1[0]="@Key";
    strArray1[1]=oneLine.split("=")[0];
    strArray1[2]=oneLine.split("=")[1];
    } else {
    strArray1[0]="@ElementError";
    strArray1[1]="";
    strArray1[2]="";
    strArray1[3]="";
    }
    }
    if(strArray1[0].equals("@Node")) {
    previousNode=currentNode;
    currentNode=strArray1[1];
    if(row>0) {
    configMap.put(previousNode,vec.elementAt(0));
    //"size:"+configMap.size()
    vec.clear();
    row=0;
    }
    } else if(strArray1[0].equals("@Key") && row==0) {
    Properties ht=new Properties();
    ht.setProperty(strArray1[1],strArray1[2]);
    vec.add(0,ht);
    row++;
    } else if(strArray1[0].equals("@Key") && row>0) {
    Properties ht2=new Properties();
    ht2.put(strArray1[1],strArray1[2]);
    vec.clear();
    vec.add(0,ht2);
    row++;
    }
    }
    }
    configMap.put(currentNode,vec.elementAt(0));
    } catch (FileNotFoundException e) {
    configMap=null;
    e.printStackTrace();
    } catch (IOException e) {
    configMap=null;
    e.printStackTrace();
    } finally {
    vec.clear();
    try {
    bufferedReader.close();
    fileReader.close();
    } catch (IOException e) {
    e.printStackTrace();
    }
    }
    }
    String nodeKey="["+%%2+"]";
    Properties ht=null;
    if(configMap.containsKey(nodeKey)) {
    ht=(Properties)configMap.get(nodeKey);
    } else {
    ht=(Properties)configMap.put(nodeKey,%%3);
    }
    try {
    ht.setProperty(%%3,%%4);
    } catch (NullPointException e) {
    e.printStackTrace();
    }
    FileWriter fw= null;
    BufferedWriter bw= null;
    try {
    fw = new FileWriter(%%1);
    bw=new BufferedWriter(fw);
    } catch (IOException e) {
    e.printStackTrace();
    }
    Set keys=configMap.keySet();
    Iterator ite=keys.iterator();
    while(ite.hasNext()) {
    String oneKey=(String)ite.next();
    try {
    bw.write(oneKey+"/n");
    } catch (IOException e) {
    e.printStackTrace();
    }
    ht=(Properties)configMap.get(oneKey);
    ht.list(new PrintWriter(bw,true));
    }

    37.获得当前路径

    复制代码代码如下:
    String %%1=this.getClass().getResource("/").getPath();


    38.读取XML数据库

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    //import java.io.*;
    //import javax.xml.parsers.*;
    //import org.xml.sax.*;
    //import org.w3c.dom.*;
    private Document document;
    File xml_file=new File(%%1);
    DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
    try {
    DocumentBuilder builder=factory.newDocumentBuilder();
    document=builder.parse(xml_file);
    } catch(Exception e) {
    e.printStackTrace();
    }
    String subNodeTag=%%2;
    Element rootNode=document.getDocumentElement();
    //%%2="serverList" //%%4="id" //%%6="port"
    //%%3="server" //%%5="ipaddr"
    NodeList nlist=rootNode.getElementsByTagName(subNodeTag);
    int len=nlist.getLength();
    Node x=null;
    for(int i=0;i<len;i++) {
    x=nlist.item(i);
    String getNodeAttrValue=null;
    NamedNodeMap attrList=node.getAttributes();
    for(int j=0;j<attrList.getLength();j++) {
    if(attrList.item(j).getNodeName().compareTo(%%7)==0) {
    getNodeAttrValue=attrList.item(j).getNodeValue();
    break;
    }
    }
    if(getNodeAttrValue.compareTo(%%8)==0)
    break;
    }
    String %%9=null;
    if(x!=null) {
    NodeList nlist=node.getChildNodes();
    int len=nlist.getLength();
    Node currentNode;
    String nodeName;
    for(int i=0;i<len;i++) {
    currentNode=nlist.item(i);
    nodeName=currentNode.getNodeName();
    if(nodeName.equals(%%5)==0) {
    %%9=document.getElementValue(currentNode);
    break;
    }
    }
    }

    39.写入XML数据库

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    //import java.io.*;
    //import javax.xml.parsers.*;
    //import org.xml.sax.*;
    //import org.w3c.dom.*;
    //import javax.xml.transform.*;
    //import javax.xml.transform.dom.*;
    //import javax.xml.transform.stream.*;
    private Document document;
    private Element node;
    File xml_file=new File(%%1);
    DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
    try {
    DocumentBuilder builder=factory.newDocumentBuilder();
    document=builder.parse(xml_file);
    } catch(Exception e) {
    e.printStackTrace();
    }
    String subNodeTag=%%2;
    Element rootNode=document.getDocumentElement();
    //%%2="serverList" //%%4="id" //%%6="port"
    //%%3="server" //%%5="ipaddr"
    NodeList nlist=rootNode.getElementByTagName(subNodeTag);
    node=document.createElement(%%3);
    node.setAttribute(%%4,nlist.getLength()+1).toString());
    node.appendChild(document.createTextNode("/n");
    Element ipNode=document.createElement(%%5);
    ipNode.appendChild(document.createTextNode(%%8));
    node.appendChild(ipNode);
    node.appendChild(document,createTextNode("/n");
    Element port=document.createElement(%%6);
    port.appendChild(document.createTextNode(%%9));
    node.appendChild(port);
    node.appendChild(document,createTextNode("/n");
    nlist.appendChild(node);
    TransformerFactory tFactory=TransformerFactory.newInstance();
    Transformer transformer=null;
    try {
    transformer=tFactory.newTransformer();
    DOMSource source=new DOMSource(document);
    StreamResult result=new StreamResult(xml_file);
    transformer.transform(source,result);
    } catch(Exception e) {
    e.printStackTrace();
    }

    40.ZIP压缩文件

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    //import java.io.*;
    //import java.util.zip.*;
    //创建文件输入流对象
    FileInputStream fis=new FileInputStream(%%1);
    //创建文件输出流对象
    FileOutputStream fos=new FileOutputStream(%%2);
    //创建ZIP数据输出流对象
    ZipOutputStream zipOut=new ZipOutputStream(fos);
    //创建指向压缩原始文件的入口
    ZipEntry entry=new ZipEntry(args[0]);
    zipOut.putNextEntry(entry);
    //向压缩文件中输出数据
    int nNumber;
    byte[] buffer=new byte[1024];
    while((nNumber=fis.read(buffer))!=-1)
    zipOut.write(buffer,0,nNumber);
    //关闭创建的流对象
    zipOut.close();
    fos.close();
    fis.close();
    }
    catch(IOException e)
    {
    System.out.println(e);
    }

    41.获得应用程序完整路径 

    复制代码代码如下:
    String %%1=System.getProperty("user.dir");


    42.ZIP解压缩

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    //import java.io.*;
    //import java.util.zip.*;
    try{
    //创建文件输入流对象实例
    FileInputStream fis=new FileInputStream(%%1);
    //创建ZIP压缩格式输入流对象实例
    ZipInputStream zipin=new ZipInputStream(fis);
    //创建文件输出流对象实例
    FileOutputStream fos=new FileOutputStream(%%2);
    //获取Entry对象实例
    ZipEntry entry=zipin.getNextEntry();
    byte[] buffer=new byte[1024];
    int nNumber;
    while((nNumber=zipin.read(buffer,0,buffer.length))!=-1)
    fos.write(buffer,0,nNumber);
    //关闭文件流对象
    zipin.close();
    fos.close();
    fis.close();
    }
    catch(IOException e) {
    System.out.println(e);
    }

    43.递归删除目录中的文件

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    //import java.io.*;
    //import java.util.*;
    ArrayList<String> folderList = new ArrayList<String>();
    folderList.add(%%1);
    for (int j = 0; j < folderList.size(); j++) {
    File file = new File(folderList.get(j));
    File[] files = file.listFiles();
    ArrayList<File> fileList = new ArrayList<File>();
    for (int i = 0; i < files.length; i++) {
    if (files[i].isDirectory()) {
    folderList.add(files[i].getPath());
    } else {
    fileList.add(files[i]);
    }
    }
    for (File f : fileList) {
    f.delete();
    }
    }

    43.ZIP压缩文件夹

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    //import java.io.*;
    //import org.apache.tools.zip.ZipOutputStream;
    //这个包在ant.jar里，要到官方网下载
    //import java.util.zip.*;
    try {
    String zipFileName = %%2; //打包后文件名字
    File f=new File(%%1);
    ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));
    String base= "";
    if (f.isDirectory()) {
    File[] fl = f.listFiles();
    out.putNextEntry(new org.apache.tools.zip.ZipEntry(base + "/"));
    base = base.length() == 0 ? "" : base + "/";
    for (int i = 0; i < fl.length; i++) {
    zip(out, fl[i], base + fl[i].getName());
    }
    }else {
    out.putNextEntry(new org.apache.tools.zip.ZipEntry(base));
    FileInputStream in = new FileInputStream(f);
    int b;
    while ( (b = in.read()) != -1) {
    out.write(b);
    }
    in.close();
    }
    out.close();
    }catch (Exception ex) {
    ex.printStackTrace();
    }

    44.Java验证DTD

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    //import java.io.*;
    //import javax.xml.parsers.*;
    //import org.xml.sax.*;
    //import org.w3c.dom.*;
    try {
    InputStream in=new FileInputStream(filePath);
    SAXReader saxReader = new SAXReader();
    this.document = saxReader.read(in);
    DocumentBuilderFactory factory = null;
    factory = DocumentBuilderFactory.newInstance();
    //进行dtd检查
    factory.setValidating(true);
    } catch (Exception e) {
    }

    45.验证Schema

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    //import java.io.*;
    //import javax.xml.parsers.*;
    //import org.xml.sax.*;
    //import org.w3c.dom.*;
    String xsdFileName = /"Q:////_dev_stu////xsdtest////src////note.xsd/";
    try {
    //创建默认的XML错误处理器
    XMLErrorHandler errorHandler = new XMLErrorHandler();
    //获取基于 SAX 的解析器的实例
    SAXParserFactory factory = SAXParserFactory.newInstance();
    //解析器在解析时验证 XML 内容。
    factory.setValidating(true);
    //指定由此代码生成的解析器将提供对 XML 名称空间的支持。
    factory.setNamespaceAware(true);
    //使用当前配置的工厂参数创建 SAXParser 的一个新实例。
    SAXParser parser = factory.newSAXParser();
    //创建一个读取工具
    SAXReader xmlReader = new SAXReader();
    //获取要校验xml文档实例
    Document xmlDocument = (Document) xmlReader.read(new File(xmlFileName));
    //设置 XMLReader 的基础实现中的特定属性。核心功能和属性列表可以在 http://sax.sourceforge.net/?selected=get-set 中找到。
    parser.setProperty(
    /"http://java.sun.com/xml/jaxp/properties/schemaLanguage",
    /"http://www.w3.org/2001/XMLSchema");
    parser.setProperty(
    /"http://java.sun.com/xml/jaxp/properties/schemaSource",
    /"file:/" + xsdFileName);
    //创建一个SAXValidator校验工具，并设置校验工具的属性
    SAXValidator validator = new SAXValidator(parser.getXMLReader());
    //设置校验工具的错误处理器，当发生错误时，可以从处理器对象中得到错误信息。
    validator.setErrorHandler(errorHandler);
    //校验
    validator.validate(xmlDocument);
    XMLWriter writer = new XMLWriter(OutputFormat.createPrettyPrint());
    //如果错误信息不为空，说明校验失败，打印错误信息
    if (errorHandler.getErrors().hasContent()) {
    System.out.println(/"XML文件通过XSD文件校验失败！/");
    writer.write(errorHandler.getErrors());
    } else {
    System.out.println(/"Good! XML文件通过XSD文件校验成功！/");
    }
    } catch (Exception ex) {
    System.out.println(/"XML文件: /" + xmlFileName + /" 通过XSD文件:/" + xsdFileName + /"检验失败。/n原因： /" + ex.getMessage
    ());
    ex.printStackTrace();
    }
    }

    46.Grep

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    //import java.util.regex.*;
    //import java.io.*;
    /**
    * Simple implementation of the ubiquitous grep command.
    * First argument is the regular expression to search for (remember to
    * quote and/or escape as appropriate). All following arguments are
    * filenames to read and search for the regular expression.
    *
    * Created: April, 2002
    * @author Ron Hitchens (ron@ronsoft.com)
    * @version $Id: SimpleGrep.java,v 1.1 2002/05/07 02:21:08 ron Exp $
    */
    public static void main (String [] argv)
    throws Exception
    {
    if (argv.length < 2) { // 如果参数行没有输入参数，结束程序
    System.out.println ("Usage: regex file [ ... ]");
    return;
    }
    Pattern pattern = Pattern.compile (argv [0]); // 第一个参数为需要匹配的字符串
    Matcher matcher = pattern.matcher ("");
    // 一次读取各个文件
    for (int i = 1; i < argv.length; i++) {
    String file = argv [i]; // 第2个参数开始，均为文件名。
    BufferedReader br = null;
    String line;
    try {
    br = new BufferedReader (new FileReader (file)); // 打开文件
    } catch (IOException e) {
    // 没有打开文件，则产生异常
    System.err.println ("Cannot read '" + file
    + "': " + e.getMessage());
    continue;
    }
    while ((line = br.readLine()) != null) { // 读入一行，直到文件结束
    matcher.reset (line); // 匹配字符串
    if (matcher.find()) { // 如果有匹配的字符串，则输出
    System.out.println (file + ": " + line);
    }
    }
    br.close(); // 关闭文件
    }
    }

    47.直接创建多级目录

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    //import java.io.*;
    File f=new File(%%1);
    f.mkdirs();

    48.批量重命名

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    //import java.io.*;
    File target = new File("%%1");
    String[] files = target.list();
    File f = null;
    String filename = null;
    for (String file : files) {
    f = new File(fl, file);
    filename = f.getName();
    if (filename.substring(filename.lastIndexOf
    (".")).equalsIgnoreCase(
    "%%2")) {
    f.renameTo(new File(target.getAbsolutePath(),
    filename.replace(
    "%%2", "%%3")));
    // 这里可以反复使用replace替换,当然也可以使用正则表达式来
    //替换了 ".txt" ".bat"
    }
    }

    49.文本查找替换

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    //import java.nio.*;
    String s1=%%1;
    String s2=%%2;
    String s3=%%3;
    int pos=%%4;
    /*变量i和j分别表示主串和模式串中当前字符串的位置，k表示匹配次数*/
    int i,j,k=0;
    i = pos;
    j = 0;
    //将s1转化成StringBuffer型进行操作
    repStr = new StringBuffer(s1);
    while(i<repStr.length()&&j<s2.length())
    {
    if(repStr.charAt(i) == s2.charAt(j))
    {
    ++i; ++j;
    if(j==s2.length())
    {
    /*j=s2.length()表示字符串匹配成功，匹配次数加1，此外对主串进行字符串替换*/
    k = k+1;
    repStr.replace(i-j,i,s3);
    //将j进行重新赋值开始新的比较
    j = 0;
    }
    }
    else {i = i-j+1; j = 0;}
    }
    return k;

    50.文件关联

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    //import java.io.*;
    try {
    Runtime.getRuntime().exec(%%1); //"assoc .txt =mynote" "assoc [.ext[=[filetype]]]"
    } catch (IOException e) {
    e.printStackTrace();
    }

    52.设置JDK环境变量

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    @echo off
    IF EXIST %1/bin/java.exe (
    rem 如输入正确的 Java2SDK 安装目录，开始设置环境变量
    @setx JAVA_HOME %1
    @setx path %path%;%JAVA_HOME%/bin
    @setx classpath %classpath%;.
    @setx classpath %classpath%;%JAVA_HOME%/lib/tools.jar
    @setx classpath %classpath%;%JAVA_HOME%/lib/dt.jar
    @setx classpath %classpath%;%JAVA_HOME%/jre/lib/rt.jar
    @echo on
    @echo Java 2 SDK 环境参数设置完毕，正常退出。
    ) ELSE (
    IF "%1"=="" (
    rem 如没有提供安装目录，提示之后退出
    @echo on
    @echo 没有提供 Java2SDK 的安装目录,不做任何设置，现在退出环境变量设置。
    ) ELSE (
    rem 如果提供非空的安装目录但没有bin/java.exe，则指定的目录为错误的目录
    @echo on
    @echo 非法的 Java2SDK 的安装目录,不做任何设置，现在退出环境变量设置。
    )
    )
    //http://sourceforge.net/projects/jregistrykey/
    //import ca.beq.util.win32.registry.*;
    //import java.util.*;

    1.打开键

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    RegistryKey r = new RegistryKey(RootKey.HKEY_LOCAL_MACHINE,
    "SOFTWARE//Microsoft//Windows//CurrentVersion//Explorer//Shell Folders");

    2.添加键

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    RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ
    Technologies");
    r.create();

    3.写入字符串值

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    RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
    RegistryValue v = new RegistryValue("myVal", ValueType.REG_SZ, "data");
    r.setValue(v);

    4.获取DWORD值

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    RegistryKey r = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Software//BEQ Technologies");
    if(r.hasValue("myValue")) {
    RegistryValue v = r.getValue("myValue");
    v.setType(ValueType.REG_DWORD);
    } // if

    53.选择文件夹对话框

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    /*
    import java.io.*;
    import javax.swing.*;
    */
    JFileChooser chooser = new JFileChooser();
    chooser.setCurrentDirectory(new File("."));
    chooser.setFileFilter(new javax.swing.filechooser.FileFilter() {
    public boolean accept(File f) {
    return f.getName().toLowerCase().endsWith(".gif")
    || f.isDirectory();
    }
    public String getDescription() {
    return "GIF Images";
    }
    });
    int r = chooser.showOpenDialog(null);
    if (r == JFileChooser.APPROVE_OPTION) {
    String name = chooser.getSelectedFile().getPath();
    // label.setIcon(new ImageIcon(name));
    }

    54.删除空文件夹

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    //import java.io.*;
    File f=new File(%%1);
    if (isFolerNull(f)) {
    for (File file :f.listFiles()) {
    if (file.list().length == 0) {
    System.out.println(file.getPath());
    file.delete();
    }
    }
    }

    55.发送数据到剪贴板

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    //import java.awt.*;
    //import java.awt.datatransfer.*;
    Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
    Transferable tText = new StringSelection(%%1);
    clipboard.setContents(tText, null);

    56.从剪贴板中取数据

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    //import java.awt.*;
    //import java.awt.datatransfer.*;
    // 取得系统剪贴板里可传输的数据构造的Java对象
    Transferable t = Toolkit.getDefaultToolkit()
    .getSystemClipboard().getContents(null);
    try {
    if (t != null
    && t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
    // 因为原系的剪贴板里有多种信息, 如文字, 图片, 文件等
    // 先判断开始取得的可传输的数据是不是文字, 如果是, 取得这些文字
    String s = (String) t
    .getTransferData(DataFlavor.stringFlavor);
    // 同样, 因为Transferable中的DataFlavor是多种类型的,
    // 所以传入DataFlavor这个参数, 指定要取得哪种类型的Data.
    System.out.println(s);
    }
    } catch (UnsupportedFlavorException ex) {
    ex.printStackTrace();
    } catch (IOException ex) {
    ex.printStackTrace();
    }

    57.获取文件路径的父路径 

    复制代码代码如下:
    String %%2=%%1.substring(0,%%1.lastIndexOf("//"));


    58.创建快捷方式

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    //import java.io.*;
    try {
    PrintWriter pw=new PrintWriter(new FileOutputStream("C:/a.bat"));
    pw.println(%%1);"C:/a.txt"
    pw.close();
    }
    catch(IOException e){
    e.printStackTrace();
    }

    59.弹出快捷菜单

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    //MouseEvent e
    JPopupMenu jpm=new JPopupMenu();
    show(jpm,x,y);

    60.文件夹复制到整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径"); // 建立选择档案对话
    //方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径"); // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();
    LinkedList<String> folderList = new LinkedList<String>();
    folderList.add(%%1);
    LinkedList<String> folderList2 = new LinkedList<String>();
    folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("//")));
    while (folderList.size() > 0) {
    (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹
    File folders = new File(folderList.peek());
    String[] file = folders.list();
    File temp = null;
    try {
    for (int i = 0; i < file.length; i++) {
    if (folderList.peek().endsWith(File.separator)) {
    temp = new File(folderList.peek() + File.separator
    + file[i]);
    } else {
    temp = new File(folderList.peek() + File.separator
    + file[i]);
    }
    if (temp.isFile()) {
    FileInputStream input = new FileInputStream(temp);
    FileOutputStream output = new FileOutputStream(
    folderList2.peek() + File.separator
    + (temp.getName()).toString());
    byte[] b = new byte[5120];
    int len;
    while ((len = input.read(b)) != -1) {
    output.write(b, 0, len);
    }
    output.flush();
    output.close();
    input.close();
    }
    if (temp.isDirectory()) {// 如果是子文件夹
    for (File f : temp.listFiles()) {
    if (f.isDirectory()) {
    folderList.add(f.getPath());
    folderList2.add(folderList2.peek()
    + File.separator + f.getName());
    }
    }
    }
    }
    } catch (Exception e) {
    //System.out.println("复制整个文件夹内容操作出错");
    e.printStackTrace();
    }
    folderList.removeFirst();
    folderList2.removeFirst();
    }

    61.文件夹移动到整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径"); // 建立选择档案对话
    //方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径"); // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();

    62.目录下所有文件夹复制到整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径");
    // 建立选择档案对话
    //方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径"); // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();

    63.目录下所有文件夹移动到整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径");
    // 建立选择档案对话
    //方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径");
    // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();

    64.目录下所有文件复制到整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径");
    // 建立选择档案对话
    //方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径");
    // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();

    65.目录下所有文件移动到整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径");
    // 建立选择档案对话
    //方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径");
    // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();

    66.对目标压缩文件解压缩到指定文件夹

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */

    67.创建目录副本整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */
    JFileChooser Jfc = new JFileChooser("请选择源路径");
    // 建立选择档案对话
    方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%1 = Jfc.getSelectedFile().getParent();
    Jfc = new JFileChooser("请选择目标路径");
    // 建立选择档案对话方块盒 Jfc
    if (!Jfc.isFileSelectionEnabled()) {
    return;
    }
    String %%2 = Jfc.getSelectedFile().getParent();

    68.打开网页

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    //import java.io.*;
    try{
    String command = "C://Program Files//Internet Explorer//Iexplore.exe "+%%1;
    Runtime.getRuntime().exec(command);
    } catch (IOException ex) {
    ex.printStackTrace();
    }

    69.删除空文件夹整合操作

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    /*
    import java.io.*;
    import java.util.*;
    import javax.swing.*;
    */

    70.获取磁盘所有分区后再把光驱盘符去除(用"/0"代替)，把结果放在数组allfenqu[] 中，数组中每 
    个元素代表一个分区盘符，不包括 :// 这样的路径，allfenqu[]数组开始时存放的是所有盘符。  
    当我用这样的代码测试结果是正确的，光驱盘符会被去掉：

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    String root; //root代表盘符路径
    for(i=0;i<20;i++) //0-20代表最大的盘符数
    {
    root.Format("%c://",allfenqu[i]);
    if(GetDriveType(root)==5)
    allfenqu[i]='/0';
    }
    但我用这样的代码时结果却无法去掉光驱盘符，allfenqu[]中还是会包含光驱盘符：
    String root;
    for(i=0;i<20;i++)
    {
    root=allfenqu[i]+"://";
    if(GetDriveType(root)==5)
    allfenqu[i]='/0';
    }

    71.激活一个程序或程序关联的文件

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    //import java.io.*;
    try {
    Runtime.getRuntime().exec(%%1);
    } catch (IOException e) {
    e.printStackTrace();
    }

    72.HTTP下载

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    public class DownloadCSVFileAction extends Action{
    public ActionForward execute(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response) throws Exception {
    try {
    String fileName = request.getParameter( "fileName ");
    long maID = Long.parseLong(request.getParameter( "maID "));
    String filePath = request.getSession().getServletContext
    ().getRealPath( "/ ")+ "csv/ "+maID+ "/ "+fileName;
    File fdown = new File(filePath);
    int filelength = Integer.parseInt(String.valueOf
    (fdown.length()));
    //下载类型
    response.setContentType( "application/text;charset=GB2312 ");
    response.setHeader( "Content-Dispositon ", "attachment;filename=
    销售详细记录.csv "); //销售详细记录.csv是我想要的下载文件的文件名,但是下载对话框中显
    示的是 downLoadCSVFile.do
    response.setContentLength(filelength);
    byte b[]=new byte[filelength];
    FileInputStream fi=new FileInputStream(fdown);
    OutputStream o=response.getOutputStream();
    int n = 0;
    while((n=fi.read(b))!=-1) {
    o.write(b,0,n);
    }
    fi.close();
    o.close();
    return null;
    }catch (Exception e) {
    request.setAttribute( "ERROR ", e);
    return mapping.findForward( "error ");
    }
    }
    }

    对应的下载类型

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    private String getContentType(String fileName) {
    String fileNameTmp = fileName.toLowerCase();
    String ret = "";
    if (fileNameTmp.endsWith("txt")) {
    ret = "text/plain";
    }
    if (fileNameTmp.endsWith("gif")) {
    ret = "image/gif";
    }
    if (fileNameTmp.endsWith("jpg")) {
    ret = "image/jpeg";
    }
    if (fileNameTmp.endsWith("jpeg")) {
    ret = "image/jpeg";
    }
    if (fileNameTmp.endsWith("jpe")) {
    ret = "image/jpeg";
    }
    if (fileNameTmp.endsWith("zip")) {
    ret = "application/zip";
    }
    if (fileNameTmp.endsWith("rar")) {
    ret = "application/rar";
    }
    if (fileNameTmp.endsWith("doc")) {
    ret = "application/msword";
    }
    if (fileNameTmp.endsWith("ppt")) {
    ret = "application/vnd.ms-powerpoint";
    }
    if (fileNameTmp.endsWith("xls")) {
    ret = "application/vnd.ms-excel";
    }
    if (fileNameTmp.endsWith("html")) {
    ret = "text/html";
    }
    if (fileNameTmp.endsWith("htm")) {
    ret = "text/html";
    }
    if (fileNameTmp.endsWith("tif")) {
    ret = "image/tiff";
    }
    if (fileNameTmp.endsWith("tiff")) {
    ret = "image/tiff";
    }
    if (fileNameTmp.endsWith("pdf")) {
    ret = "application/pdf";
    }
    return ret;
    }

    73.FTP下载

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    /*
    import sun.net.ftp.FtpClient;
    import java.io.*;
    import sun.net.*;
    */
    //如果文件在某个目录下，则加入fc.cd("foodir");
    //比如要下载ftp://ftp.xx.com/index.html则：
    try
    {
    FtpClient fc=new FtpClient("ftp.xx.com");
    fc.login("username","888888");
    int ch;
    File fi = new File("c://index.html");
    RandomAccessFile getFile = new RandomAccessFile(fi,"rw");
    getFile.seek(0);
    TelnetInputStream fget=fc.get("index.html");
    DataInputStream puts = new DataInputStream(fget);
    while ((ch = puts.read()) >= 0) {
    getFile.write(ch);
    }
    fget.close();
    getFile.close();
    fc.closeServer();
    }
    catch (IOException ex)
    {
    ex.printStackTrace();
    }

    74.写图像到剪切板 setClipboardImage 

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    /*
    import java.awt.*;
    import java.awt.datatransfer.*;
    import java.io.*;
    */
    private final Image image;
    Transferable trans = new Transferable() {
    public DataFlavor[] getTransferDataFlavors() {
    return new DataFlavor[] { DataFlavor.imageFlavor };
    }
    public boolean isDataFlavorSupported(DataFlavor flavor) {
    return DataFlavor.imageFlavor.equals(flavor);
    }
    public Object getTransferData(DataFlavor flavor)
    throws UnsupportedFlavorException, IOException {
    if (isDataFlavorSupported(flavor))
    return image;
    throw new UnsupportedFlavorException(flavor);
    }
    };
    Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans,
    null);

    75.从剪贴板复制图像到窗体

    76.删除文件夹下的所有文件且不删除文件夹下的文件夹 

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    //import java.io.*;
    //import java.util.*;
    LinkedList<String> folderList = new LinkedList<String>();
    folderList.add(%%1);
    while (folderList.size() > 0) {
    File file = new File(folderList.peek());
    folderList.removeLast();
    File[] files = file.listFiles();
    ArrayList<File> fileList = new ArrayList<File>();
    for (int i = 0; i < files.length; i++) {
    if (files[i].isDirectory()) {
    folderList.add(files[i].getPath());
    } else {
    fileList.add(files[i]);
    }
    }
    for (File f : fileList) {
    f.delete();
    }
    }

    希望本文所述对大家Java程序设计有所帮助。

    from: http://www.jb51.net/article/75169.htm
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  • 原文地址：https://www.cnblogs.com/GarfieldEr007/p/5745817.html
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