迟到的第14周作业

一、题目1

　　编写一个应用程序，输入一个目录和一个文件类型，显示该目录下符合该类型的所有文件。之后，将这些文件中的某一个文件剪切到另外一个目录中。

二、代码

Test4.java

/*
 * 创建一个主类和方法类，手动输入目录 列出所有文件，指定某类型 列出该类型文件
 * 并将文件剪切到其他目录
 * 
 */
package g;

import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.Scanner;

class W implements FilenameFilter{
    String lx;
    W(String lx){
        this.lx=lx;
    }
    public boolean accept(File file,String name){
        return name.endsWith(lx);//尾部查询
    }
}
public class Test4 {

    public static void main(String[] args) {
        Scanner reader=new Scanner(System.in);
        System.out.println("请输入路径:");
        String path=reader.nextLine();
        File file=new File(path);
        String filename[]=file.list();//将所有文件名放入数组里
        for(String name:filename){
            System.out.println(name);
        }
        System.out.println("输入查询后缀:");
        W filew = new W(reader.nextLine());
        String filename1[]=file.list(filew);//将查询后的文件名放入数组里
        for(String name:filename1){
            System.out.println(name);
        }
             System.out.println("请输入需要剪切的文件名：");
            String cut = reader.nextLine();
            File cutfile = new File(path+"\"+cut);//存入原文件
            System.out.println("请输入该文件需要移动到的目录：");
            String cutway = reader.nextLine(); 
            File cutlist = new File(cutway);//存入目录        
            File newfile = new File(cutway+"\"+cut);//存入新目录下新文件
            try {
                newfile.createNewFile();//创建新文件
            } catch (IOException e) {
                e.printStackTrace();
            }
            InputStream inputStream = null;
            BufferedInputStream bufferedInputStream = null;
            String filedata="";
            Writer writer = null;
            BufferedWriter bufferedWriter = null;
            try {
                inputStream = new FileInputStream(cutfile);
                bufferedInputStream = new BufferedInputStream(inputStream);
                byte[] b = new byte[1024];
                int count = 0;
                while((count = bufferedInputStream.read(b, 0, 1024))!=-1){
                    filedata=filedata+new String(b, 0, count);//遍历到字节存入字符串
                }
                writer = new FileWriter(newfile);
                bufferedWriter = new BufferedWriter(writer);
                bufferedWriter.write(filedata);//字符串写入新文件
            } catch (FileNotFoundException e1) {
                e1.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }finally{
                try {
                    bufferedInputStream.close();//关闭流
                    inputStream.close();
                    bufferedWriter.close();
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            cutfile.delete();//删除原文件
    }

}

三、运行结果