一、日期工具类
package com.ebd.application.common.utils; import java.sql.Timestamp; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import org.apache.commons.lang.time.DateFormatUtils; /** * 日期工具类, 继承org.apache.commons.lang.time.DateUtils类 */ public class DateUtils extends org.apache.commons.lang.time.DateUtils { private static String[] parsePatterns = { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm" }; /** * 得到当前日期字符串 格式(yyyy-MM-dd) */ public static String getDate() { return getDate("yyyy-MM-dd"); } /** * Timestamp to Date String */ public static String timestamptoString(Long timestampStr) { Timestamp ts = new Timestamp(timestampStr); String dateStr = ""; DateFormat sdf = new SimpleDateFormat(parsePatterns[1]); try { dateStr = sdf.format(ts); } catch (Exception e) { e.printStackTrace(); } return dateStr; } /** * 得到当前日期字符串 格式(yyyy-MM-dd) pattern可以为:"yyyy-MM-dd" "HH:mm:ss" "E" */ public static String getDate(String pattern) { return DateFormatUtils.format(new Date(), pattern); } /** * 得到日期字符串 默认格式(yyyy-MM-dd) pattern可以为:"yyyy-MM-dd" "HH:mm:ss" "E" */ public static String formatDate(Date date, Object... pattern) { String formatDate = null; if (pattern != null && pattern.length > 0) { formatDate = DateFormatUtils.format(date, pattern[0].toString()); } else { formatDate = DateFormatUtils.format(date, "yyyy-MM-dd"); } return formatDate; } /** * 得到日期时间字符串,转换格式(yyyy-MM-dd HH:mm:ss) */ public static String formatDateTime(Date date) { return formatDate(date, "yyyy-MM-dd HH:mm:ss"); } /** * 得到当前时间字符串 格式(HH:mm:ss) */ public static String getTime() { return formatDate(new Date(), "HH:mm:ss"); } /** * 得到当前日期和时间字符串 格式(yyyy-MM-dd HH:mm:ss) */ public static String getDateTime() { return formatDate(new Date(), "yyyy-MM-dd HH:mm:ss"); } /** * 得到当前年份字符串 格式(yyyy) */ public static String getYear() { return formatDate(new Date(), "yyyy"); } /** * 得到当前月份字符串 格式(MM) */ public static String getMonth() { return formatDate(new Date(), "MM"); } /** * 得到当天字符串 格式(dd) */ public static String getDay() { return formatDate(new Date(), "dd"); } /** * 得到当前星期字符串 格式(E)星期几 */ public static String getWeek() { return formatDate(new Date(), "E"); } /** * 日期型字符串转化为日期 格式 { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", * "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm" } */ public static Date parseDate(Object str) { if (str == null) { return null; } try { return parseDate(str.toString(), parsePatterns); } catch (ParseException e) { return null; } } /** * 获取过去的天数 * * @param date * @return */ public static long pastDays(Date date) { long t = new Date().getTime() - date.getTime(); return t / (24 * 60 * 60 * 1000); } public static Date getDateStart(Date date) { if (date == null) { return null; } SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { date = sdf.parse(formatDate(date, "yyyy-MM-dd") + " 00:00:00"); } catch (ParseException e) { e.printStackTrace(); } return date; } public static Date getDateEnd(Date date) { if (date == null) { return null; } SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { date = sdf.parse(formatDate(date, "yyyy-MM-dd") + " 23:59:59"); } catch (ParseException e) { e.printStackTrace(); } return date; } }
二、文件目录工具
package com.ebd.application.common.utils; import java.io.File; import java.io.IOException; public class CreateFileUtil { public static boolean createFile(String destFileName) { File file = new File(destFileName); if(file.exists()) { System.out.println("创建单个文件" + destFileName + "失败,目标文件已存在!"); return false; } if (destFileName.endsWith(File.separator)) { System.out.println("创建单个文件" + destFileName + "失败,目标文件不能为目录!"); return false; } //判断目标文件所在的目录是否存在 if(!file.getParentFile().exists()) { //如果目标文件所在的目录不存在,则创建父目录 System.out.println("目标文件所在目录不存在,准备创建它!"); if(!file.getParentFile().mkdirs()) { System.out.println("创建目标文件所在目录失败!"); return false; } } //创建目标文件 try { if (file.createNewFile()) { System.out.println("创建单个文件" + destFileName + "成功!"); return true; } else { System.out.println("创建单个文件" + destFileName + "失败!"); return false; } } catch (IOException e) { e.printStackTrace(); System.out.println("创建单个文件" + destFileName + "失败!" + e.getMessage()); return false; } } public static boolean createDir(String destDirName) { File dir = new File(destDirName); if (dir.exists()) { System.out.println(destDirName + "目录已经存在"); return true; } if (!destDirName.endsWith(File.separator)) { destDirName = destDirName + File.separator; } //创建目录 if (dir.mkdirs()) { System.out.println("创建目录" + destDirName + "成功!"); return true; } else { System.out.println("创建目录" + destDirName + "失败!"); return false; } } public static String createTempFile(String prefix, String suffix, String dirName) { File tempFile = null; if (dirName == null) { try{ //在默认文件夹下创建临时文件 tempFile = File.createTempFile(prefix, suffix); //返回临时文件的路径 return tempFile.getCanonicalPath(); } catch (IOException e) { e.printStackTrace(); System.out.println("创建临时文件失败!" + e.getMessage()); return null; } } else { File dir = new File(dirName); //如果临时文件所在目录不存在,首先创建 if (!dir.exists()) { if (!CreateFileUtil.createDir(dirName)) { System.out.println("创建临时文件失败,不能创建临时文件所在的目录!"); return null; } } try { //在指定目录下创建临时文件 tempFile = File.createTempFile(prefix, suffix, dir); return tempFile.getCanonicalPath(); } catch (IOException e) { e.printStackTrace(); System.out.println("创建临时文件失败!" + e.getMessage()); return null; } } } public static void main(String[] args) { //创建目录 String dirName = "D:/work/temp/temp0/temp1"; CreateFileUtil.createDir(dirName); //创建文件 String fileName = dirName + "/temp2/tempFile.txt"; CreateFileUtil.createFile(fileName); //创建临时文件 String prefix = "temp"; String suffix = ".txt"; for (int i = 0; i < 10; i++) { System.out.println("创建了临时文件:" + CreateFileUtil.createTempFile(prefix, suffix, dirName)); } //在默认目录下创建临时文件 for (int i = 0; i < 10; i++) { System.out.println("在默认目录下创建了临时文件:" + CreateFileUtil.createTempFile(prefix, suffix, null)); } } }
三、中文判断工具类
package com.ebd.application.common.utils; import java.util.regex.Pattern; /** * 中文判断工具类 * @author Administrator */ public class CharUtil { public static void main(String[] args) { String[] strArr = new String[] { "www.micmiu.com", "!@#$%^&*()_+{}[]|"'?/:;<>,.", "!¥……()——:;“”‘’《》,。?、", "不要啊", "やめて", "韩佳人", "???" }; for (String str : strArr) { System.out.println("===========> 测试字符串:" + str); System.out.println("正则判断结果:" + isChineseByREG(str) + " -- " + isChineseByName(str)); System.out.println("Unicode判断结果 :" + isChinese(str)); System.out.println("详细判断列表:"); char[] ch = str.toCharArray(); for (int i = 0; i < ch.length; i++) { char c = ch[i]; System.out.println(c + " --> " + (isChinese(c) ? "是" : "否")); } } } // 根据Unicode编码完美的判断中文汉字和符号 private static boolean isChinese(char c) { Character.UnicodeBlock ub = Character.UnicodeBlock.of(c); if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) { return true; } return false; } // 完整的判断中文汉字和符号 public static boolean isChinese(String strName) { char[] ch = strName.toCharArray(); for (int i = 0; i < ch.length; i++) { char c = ch[i]; if (isChinese(c)) { return true; } } return false; } // 只能判断部分CJK字符(CJK统一汉字) public static boolean isChineseByREG(String str) { if (str == null) { return false; } Pattern pattern = Pattern.compile("[\u4E00-\u9FBF]+"); return pattern.matcher(str.trim()).find(); } // 只能判断部分CJK字符(CJK统一汉字) public static boolean isChineseByName(String str) { if (str == null) { return false; } // 大小写不同:\p 表示包含,\P 表示不包含 // \p{Cn} 的意思为 Unicode 中未被定义字符的编码,\P{Cn} 就表示 Unicode中已经被定义字符的编码 String reg = "\p{InCJK Unified Ideographs}&&\P{Cn}"; Pattern pattern = Pattern.compile(reg); return pattern.matcher(str.trim()).find(); } }
四、文件上传工具
package com.ebd.application.common.utils; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import org.apache.commons.lang3.StringUtils; import org.springframework.web.multipart.MultipartFile; public class FileUploadUtils { public static final String UPLOAD_URL = "c:/pp"; /** * 上传图片,图片的名称filename是根据时间+随机数组装成的 * @param file MultipartFile file * @param request HttpServletRequest request, * @param uploadDir 上传的目的文件夹 * @return 返回文件的上传地址 (uploadDir/filename) */ public static String upload(MultipartFile file, HttpServletRequest request,String uploadDir) { String logoUrl = null; if (file != null && !file.isEmpty()) { System.out.println(request.getSession().getServletContext()); String filePath = request.getSession().getServletContext() .getRealPath(uploadDir); //目录不存在时,新建目录 createDirectory(filePath); //得到原图片的后缀名 String srcfilename = file.getOriginalFilename(); String suffix=srcfilename.substring(srcfilename.lastIndexOf(".")); //组装新图片的名称 SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmssSSS"); String format = dateFormat.format(new Date()); String filename = format+ new Random().nextInt(1000000)+suffix; File destFile = new File(filePath, filename); //如果文件存在,继续随机名称 while(destFile.exists()){ filename = format+ new Random().nextInt(1000000)+suffix; destFile = new File(filePath, filename); } try { file.transferTo(destFile); logoUrl = uploadDir + "/" + filename; } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return logoUrl; } /** * 上传文件,文件名为源文件的名称 * @param file * @param request * @param uploadDir * @return 上传文件的路径:uploadDir + "/" + srcfilename */ public static String uploadFile(MultipartFile file, HttpServletRequest request,String uploadDir) { String logoUrl = null; if (file != null && !file.isEmpty()) { //获取上传文件夹的真实地址 String dirPath = request.getSession().getServletContext() .getRealPath(uploadDir); //目录不存在时,新建目录 createDirectory(dirPath); //得到源文件的名称 String srcfilename = file.getOriginalFilename(); //构建目标文件 File destFile = new File(dirPath, srcfilename); try { //上传文件 file.transferTo(destFile); logoUrl = uploadDir + "/" + srcfilename; } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return logoUrl; } /** * 新建目录 * @param dirPath */ public static void createDirectory(String dirPath){ if(StringUtils.isNotBlank(dirPath)){ // 获得文件对象 File file = new File(dirPath); if(!file.exists()){ // 如果路径不存在,则创建 file.mkdirs(); } } } /** * 删除单个文件 * @param path 被删除文件的文件名 * @return 单个文件删除成功返回true,否则返回false */ public static boolean deleteFile(String path){ boolean flag = false; File file = new File(path); // 路径为文件且不为空则进行删除 if(file.isFile() && file.exists()){ file.delete(); flag = true; } return flag; } /** * 生产缩略图 * @param src 原图 * @param dir 缩略图 * @param fileName 缩略图名称 * @return */ public static String thumb(File src,File dir,String fileName,int nw,int nh){ try { /* AffineTransform 类表示 2D 仿射变换,它执行从 2D 坐标到其他 2D 坐标的线性映射,保留了线的“直线性”和“平行性”。可以使用一系 列平移、缩放、翻转、旋转和剪切来构造仿射变换。 */ AffineTransform transform = new AffineTransform(); //读取图片 BufferedImage bis = ImageIO.read(src); int w = bis.getWidth(); int h = bis.getHeight(); double sx = (double)nw/w; double sy = (double)nh/h; //将此变换设置为缩放变换。 transform.setToScale(sx,sy); /* * AffineTransformOp类使用仿射转换来执行从源图像或 Raster 中 2D 坐标到目标图像或 * Raster 中 2D 坐标的线性映射。所使用的插值类型由构造方法通过 * 一个 RenderingHints 对象或通过此类中定义的整数插值类型之一来指定。 * 如果在构造方法中指定了 RenderingHints 对象,则使用插值提示和呈现 * 的质量提示为此操作设置插值类型。要求进行颜色转换时,可以使用颜色 * 呈现提示和抖动提示。 注意,务必要满足以下约束:源图像与目标图像 * 必须不同。 对于 Raster 对象,源图像中的 band 数必须等于目标图像中 * 的 band 数。 */ AffineTransformOp ato = new AffineTransformOp(transform,null); BufferedImage bid = new BufferedImage(nw,nh,BufferedImage.TYPE_3BYTE_BGR); /* * TYPE_3BYTE_BGR 表示一个具有 8 位 RGB 颜色分量的图像, * 对应于 Windows 风格的 BGR 颜色模型,具有用 3 字节存 * 储的 Blue、Green 和 Red 三种颜色。 */ ato.filter(bis,bid); ImageIO.write(bid,"jpeg",dir); } catch(Exception e) { e.printStackTrace(); } return dir + "/" + fileName; } /** * 复制整个文件夹内容 * @param oldPath * @param newPath * @return boolean */ public static void copyFolder(String oldPath, String newPath) { try { //如果文件夹不存在 则建立新文件夹 (new File(newPath)).mkdirs(); File a=new File(oldPath); String[] file=a.list(); File temp=null; for (int i = 0; i < file.length; i++) { if(oldPath.endsWith(File.separator)){ temp=new File(oldPath+file[i]); } else{ temp=new File(oldPath+File.separator+file[i]); } if(temp.isFile()){ FileInputStream input = new FileInputStream(temp); FileOutputStream output = new FileOutputStream(newPath + "/" + (temp.getName()).toString()); byte[] b = new byte[1024 * 5]; 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 copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]); } } } catch (Exception e) { System.out.println("复制整个文件夹内容操作出错"); e.printStackTrace(); } } /** * 删除文件夹 * @param filePathAndName * @param fileContent * @return boolean */ public static void delFolder(String folderPath) { try { delAllFile(folderPath); //删除完里面所有内容 String filePath = folderPath; filePath = filePath.toString(); java.io.File myFilePath = new java.io.File(filePath); myFilePath.delete(); //删除空文件夹 } catch (Exception e) { System.out.println("删除文件夹操作出错"); e.printStackTrace(); } } /** * 删除文件夹里面的所有文件 * @param path */ public static void delAllFile(String path) { File file = new File(path); if (!file.exists()) { return; } if (!file.isDirectory()) { return; } String[] tempList = file.list(); File temp = null; for (int i = 0; i < tempList.length; i++) { if (path.endsWith(File.separator)) { temp = new File(path + tempList[i]); } else { temp = new File(path + File.separator + tempList[i]); } if (temp.isFile()) { temp.delete(); } if (temp.isDirectory()) { delAllFile(path+"/"+ tempList[i]);//先删除文件夹里面的文件 delFolder(path+"/"+ tempList[i]);//再删除空文件夹 } } } /** * 移动文件到指定目录 * @param oldPath * @param newPath */ public static void moveFile(String oldPath, String newPath) { copyFolder(oldPath, newPath); delFolder(oldPath); } public static void main(String[] args) { // System.out.println(new Date().getTime()); // System.out.println(String.valueOf(new Date().getTime())); //// File f =new File("TileTest.doc"); // String fileName="TileTest....6.6doc"; // String prefix=fileName.substring(fileName.lastIndexOf(".")); // System.out.println(prefix); // System.out.println(new Random().nextInt(1000000)); // System.out.println(new Random().nextInt(1000000)); // File f = new File("d:/1.txt"); // System.out.println(f.exists()); File src = new File("D:\dcd01448724c402a8cf8b852e1307510\qrcode_for_gh_cf64bce34a18_344.jpg"); File dir = new File("D:\dcd01448724c402a8cf8b852e1307510"); // File src = new File("D:\architecture\vungu\workspace0428\vp-standweb\src\main\webapp\fileUpload\images\subscribe\dcd01448724c402a8cf8b852e1307510\20160120171448178836077.png"); // File dir = new File("D:\architecture\vungu\workspace0428\vp-standweb\src\main\webapp\fileUpload\images\subscribe\dcd01448724c402a8cf8b852e1307510"); String fileName = "20160120171448178836077thumb.jpg"; int nw=360; int nh=200; thumb(src, dir, fileName, nw, nh); } }
五、UUID简单工具
package com.ebd.application.common.utils; import java.security.SecureRandom; import java.util.UUID; public class Identities { private static SecureRandom random = new SecureRandom(); public static String uuid() { return UUID.randomUUID().toString().replaceAll("-", ""); } public static long randomLong() { return Math.abs(random.nextLong()); } }
六、JDBC工具
package com.ebd.application.common.utils; import java.lang.reflect.Field; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * JDBC工具类 * @author Administrator */ public class JdbcUtils { //数据库用户名 private static final String USERNAME = "root"; //数据库密码 private static final String PASSWORD = "root"; //驱动信息 private static final String DRIVER = "com.mysql.jdbc.Driver"; //数据库地址 private static final String URL = "jdbc:mysql://localhost:3306/test"; private Connection connection; private PreparedStatement pstmt; private ResultSet resultSet; public JdbcUtils() { // TODO Auto-generated constructor stub try{ Class.forName(DRIVER); System.out.println("数据库连接成功!"); }catch(Exception e){ } } /** * 获得数据库的连接 * @return */ public Connection getConnection(){ try { connection = DriverManager.getConnection(URL, USERNAME, PASSWORD); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return connection; } /** * 增加、删除、改 * @param sql * @param params * @return * @throws SQLException */ public boolean updateByPreparedStatement(String sql, List<Object> params)throws SQLException{ boolean flag = false; int result = -1; pstmt = connection.prepareStatement(sql); int index = 1; if(params != null && !params.isEmpty()){ for(int i=0; i<params.size(); i++){ pstmt.setObject(index++, params.get(i)); } } result = pstmt.executeUpdate(); flag = result > 0 ? true : false; return flag; } /** * 查询单条记录 * @param sql * @param params * @return * @throws SQLException */ public Map<String, Object> findSimpleResult(String sql, List<Object> params) throws SQLException{ Map<String, Object> map = new HashMap<String, Object>(); int index = 1; pstmt = connection.prepareStatement(sql); if(params != null && !params.isEmpty()){ for(int i=0; i<params.size(); i++){ pstmt.setObject(index++, params.get(i)); } } resultSet = pstmt.executeQuery();//返回查询结果 ResultSetMetaData metaData = resultSet.getMetaData(); int col_len = metaData.getColumnCount(); while(resultSet.next()){ for(int i=0; i<col_len; i++ ){ String cols_name = metaData.getColumnName(i+1); Object cols_value = resultSet.getObject(cols_name); if(cols_value == null){ cols_value = ""; } map.put(cols_name, cols_value); } } return map; } /**查询多条记录 * @param sql * @param params * @return * @throws SQLException */ public List<Map<String, Object>> findModeResult(String sql, List<Object> params) throws SQLException{ List<Map<String, Object>> list = new ArrayList<Map<String, Object>>(); int index = 1; pstmt = connection.prepareStatement(sql); if(params != null && !params.isEmpty()){ for(int i = 0; i<params.size(); i++){ pstmt.setObject(index++, params.get(i)); } } resultSet = pstmt.executeQuery(); ResultSetMetaData metaData = resultSet.getMetaData(); int cols_len = metaData.getColumnCount(); while(resultSet.next()){ Map<String, Object> map = new HashMap<String, Object>(); for(int i=0; i<cols_len; i++){ String cols_name = metaData.getColumnName(i+1); Object cols_value = resultSet.getObject(cols_name); if(cols_value == null){ cols_value = ""; } map.put(cols_name, cols_value); } list.add(map); } return list; } /**通过反射机制查询单条记录 * @param sql * @param params * @param cls * @return * @throws Exception */ public <T> T findSimpleRefResult(String sql, List<Object> params, Class<T> cls )throws Exception{ T resultObject = null; int index = 1; pstmt = connection.prepareStatement(sql); if(params != null && !params.isEmpty()){ for(int i = 0; i<params.size(); i++){ pstmt.setObject(index++, params.get(i)); } } resultSet = pstmt.executeQuery(); ResultSetMetaData metaData = resultSet.getMetaData(); int cols_len = metaData.getColumnCount(); while(resultSet.next()){ //通过反射机制创建一个实例 resultObject = cls.newInstance(); for(int i = 0; i<cols_len; i++){ String cols_name = metaData.getColumnName(i+1); Object cols_value = resultSet.getObject(cols_name); if(cols_value == null){ cols_value = ""; } Field field = cls.getDeclaredField(cols_name); field.setAccessible(true); //打开javabean的访问权限 field.set(resultObject, cols_value); } } return resultObject; } /**通过反射机制查询多条记录 * @param sql * @param params * @param cls * @return * @throws Exception */ public <T> List<T> findMoreRefResult(String sql, List<Object> params, Class<T> cls )throws Exception { List<T> list = new ArrayList<T>(); int index = 1; pstmt = connection.prepareStatement(sql); if(params != null && !params.isEmpty()){ for(int i = 0; i<params.size(); i++){ pstmt.setObject(index++, params.get(i)); } } resultSet = pstmt.executeQuery(); ResultSetMetaData metaData = resultSet.getMetaData(); int cols_len = metaData.getColumnCount(); while(resultSet.next()){ //通过反射机制创建一个实例 T resultObject = cls.newInstance(); for(int i = 0; i<cols_len; i++){ String cols_name = metaData.getColumnName(i+1); Object cols_value = resultSet.getObject(cols_name); if(cols_value == null){ cols_value = ""; } Field field = cls.getDeclaredField(cols_name); field.setAccessible(true); //打开javabean的访问权限 field.set(resultObject, cols_value); } list.add(resultObject); } return list; } /** * 释放数据库连接 */ public void releaseConn(){ if(resultSet != null){ try{ resultSet.close(); }catch(SQLException e){ e.printStackTrace(); } } } /** * @param args */ public static void main(String[] args) throws SQLException { // TODO Auto-generated method stub JdbcUtils jdbcUtils = new JdbcUtils(); jdbcUtils.getConnection(); /*******************增*********************/ /* String sql = "insert into userinfo (username, pswd) values (?, ?), (?, ?), (?, ?)"; List<Object> params = new ArrayList<Object>(); params.add("小明"); params.add("123xiaoming"); params.add("张三"); params.add("zhangsan"); params.add("李四"); params.add("lisi000"); try { boolean flag = jdbcUtils.updateByPreparedStatement(sql, params); System.out.println(flag); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }*/ /*******************删*********************/ //删除名字为张三的记录 /* String sql = "delete from userinfo where username = ?"; List<Object> params = new ArrayList<Object>(); params.add("小明"); boolean flag = jdbcUtils.updateByPreparedStatement(sql, params);*/ /*******************改*********************/ //将名字为李四的密码改了 /* String sql = "update userinfo set pswd = ? where username = ? "; List<Object> params = new ArrayList<Object>(); params.add("lisi88888"); params.add("李四"); boolean flag = jdbcUtils.updateByPreparedStatement(sql, params); System.out.println(flag);*/ /*******************查*********************/ //不利用反射查询多个记录 /* String sql2 = "select * from userinfo "; List<Map<String, Object>> list = jdbcUtils.findModeResult(sql2, null); System.out.println(list);*/ //利用反射查询 单条记录 // String sql = "select * from userinfo where username = ? "; // List<Object> params = new ArrayList<Object>(); // params.add("李四"); // UserInfo userInfo; // try { // userInfo = jdbcUtils.findSimpleRefResult(sql, params, UserInfo.class); // System.out.print(userInfo); // } catch (Exception e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } String sql2 = "select * from student "; List<Map<String, Object>> list = jdbcUtils.findModeResult(sql2, null); System.out.println(list); } }
七、JsonUtil
package com.ebd.application.common.utils; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.lang3.BooleanUtils; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JSONSerializer; public class JsonUtil extends BaseController{ @SuppressWarnings("unused") private HttpServletRequest request; private HttpServletResponse response ; public JsonUtil(HttpServletRequest request, HttpServletResponse response) { this.request = request; this.response = response; } /** * ajax后台封装jsonString * @param jsonStr * @throws IOException */ public void sendJson(String jsonStr) throws IOException { response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); out.print(jsonStr); out.flush(); out.close(); } /** * json字符串转成Java的Array数组 * @param json * @param clazz * @return */ @SuppressWarnings("rawtypes") public static Object[] readJSON2Array(String json, Class clazz) { JSONArray jsonArray = JSONArray.fromObject(json); Object[] infoList = (Object[]) JSONArray.toArray(jsonArray, clazz); return infoList; } /** * JSON字符串转成Java的List集合 * @param json * @param clazz * @return */ @SuppressWarnings({ "rawtypes", "deprecation" }) public static List<?> readJSON2List(String json, Class clazz) { JSONArray jsonArray = JSONArray.fromObject(json); List<?> infoList = JSONArray.toList(jsonArray, clazz); return infoList; } /** * JSON对象反序列化成Java对象 * @param json * @param clazz * @return */ @SuppressWarnings("rawtypes") public static Object readJSON2Bean(String json, Class clazz) { JSONObject jsonObject = JSONObject.fromObject(json); Object bean = JSONObject.toBean(jsonObject, clazz); return bean; } /** * 生成json格式串 * @param bean * @param isSeri * @param isFix * @return */ public static String writeBean2JSON(Object bean, boolean isSeri, boolean isFix) { if (bean == null) { return null; } String jsonStr = null; if (BooleanUtils.isTrue(isSeri)) { jsonStr = JSONSerializer.toJSON(bean).toString(); if (BooleanUtils.isTrue(isFix)) { jsonStr = "[" + jsonStr + "]"; } } else { if (BooleanUtils.isTrue(isFix)) { jsonStr = JSONArray.fromObject(bean).toString(); } else { jsonStr = JSONObject.fromObject(bean).toString(); } } return jsonStr; } /** * List生成Json * @param list * @param isSeri * @param isFix * @return */ public static String writeList2JSON(List<?> list, boolean isSeri, boolean isFix) { if (list == null) { return null; } String jsonStr = null; if (BooleanUtils.isTrue(isSeri)) {// 需要序列化 jsonStr = JSONSerializer.toJSON(list).toString(); if (BooleanUtils.isTrue(isFix)) { jsonStr = "[" + jsonStr + "]"; } } else { if (BooleanUtils.isTrue(isFix)) { jsonStr = JSONArray.fromObject(list).toString(); } else { jsonStr = JSONObject.fromObject(list).toString(); } } return jsonStr; } /** * Map生成Json * @param map * @param isSeri * @param isFix * @return */ public static String writeMap2JSON(Map<String, Object> map, boolean isSeri, boolean isFix) { String jsonStr = null; if (BooleanUtils.isTrue(isSeri)) {// 序列化 jsonStr = JSONSerializer.toJSON(map).toString(); if (BooleanUtils.isTrue(isFix)) { jsonStr = "[" + jsonStr + "]"; } } else { if (BooleanUtils.isTrue(isFix)) { jsonStr = JSONArray.fromObject(map).toString(); } else { jsonStr = JSONObject.fromObject(map).toString(); } } return jsonStr; } /** * Json串转为Bean * @param json * @param clazz * @param subList * @return */ @SuppressWarnings("rawtypes") public static Object readJSON2Bean(String json, Class clazz, Map<String, Object> subList) { JSONObject jsonObject = JSONObject.fromObject(json); Object bean = JSONObject.toBean(jsonObject, clazz, subList); return bean; } }
八、SpringUtils
package com.ebd.application.common.utils; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import org.springframework.beans.factory.config.BeanFactoryPostProcessor; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; public final class SpringUtils implements BeanFactoryPostProcessor { private static ConfigurableListableBeanFactory beanFactory; // Spring应用上下文环境 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { SpringUtils.beanFactory = beanFactory; } /** * 获取对象 * @param name * @return Object 一个以所给名字注册的bean的实例 * @throws org.springframework.beans.BeansException */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) throws BeansException { return (T) beanFactory.getBean(name); } /** * 获取类型为requiredType的对象 * @param clz * @return * @throws org.springframework.beans.BeansException * */ public static <T> T getBean(Class<T> clz) throws BeansException { T result = (T) beanFactory.getBean(clz); return result; } /** * 如果BeanFactory包含一个与所给名称匹配的bean定义,则返回true * * @param name * @return boolean */ public static boolean containsBean(String name) { return beanFactory.containsBean(name); } /** * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 * 如果与给定名字相应的bean定义没有被找到,将会抛出一个异常(NoSuchBeanDefinitionException) * * @param name * @return boolean * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException { return beanFactory.isSingleton(name); } /** * @param name * @return Class 注册对象的类型 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { return beanFactory.getType(name); } /** * 如果给定的bean名字在bean定义中有别名,则返回这些别名 * * @param name * @return * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException * */ public static String[] getAliases(String name) throws NoSuchBeanDefinitionException { return beanFactory.getAliases(name); } }