根据图片的exif时间信息-重命名jpg文件
由于本人经常上poco网看一些摄影师的作品，遇到喜欢的就会保存到本地，于是乎久了积了一堆的图片，自己做一个工具代码来整理这些图片，很简单就是根据图片的exif信息来重命名图片。
首先可以简单了解下关于如何得到exif信息。参考:http://yexin218.iteye.com/blog/340884 和 http://www.drewnoakes.com/code/exif/
实现代码如下：

import java.io.File;import com.drew.imaging.jpeg.JpegMetadataReader;import com.drew.imaging.jpeg.JpegProcessingException;import com.drew.metadata.Directory;import com.drew.metadata.Metadata;import com.drew.metadata.MetadataException;import com.drew.metadata.Tag;import com.drew.metadata.exif.ExifDirectory;public class ReNamePic {   /** * @param args */private String srcFilePath;    //修改前图片所在文件夹private String desFilePath;   //修改后图片所在文件夹public String getDesFilePath() {return desFilePath;}public void setDesFilePath(String desFilePath) {this.desFilePath = desFilePath;}public String getSrcFilePath() {return srcFilePath;}public void setSrcFilePath(String srcFilePath) {this.srcFilePath = srcFilePath;}public ReNamePic(String srcFilePath,String desFilePath) { //带参数的构造方法super();    this.srcFilePath = srcFilePath;    this.desFilePath = desFilePath;}protected void run(String dir){     try {             File d = new File(this.srcFilePath);             if (!d.isDirectory()) {                 System.out.println("文件路径错误");             return;             }             File[] files = d.listFiles();             for (int i = 0; i < files.length; i++) {                 if (files[i].isDirectory()) {                     run(files[i].getAbsolutePath());                 } else {                     String filename = files[i].getAbsolutePath(); //得到图片绝对路径                     if(filename.endsWith("jpg")){                     doReName(filename);                     }                  }             }         } catch (Exception e) {             e.printStackTrace();         }    }    public void doReName(String filePath){    File  jf=new File(filePath);try {Metadata metadata = JpegMetadataReader.readMetadata(jf);Directory exif = metadata.getDirectory(ExifDirectory.class);  if(exif.containsTag(ExifDirectory.TAG_DATETIME)){                try {              String reName=exif.getDescription(ExifDirectory.TAG_DATETIME).replace(":","_").replace(" ","_"); //去除时间中的：和空格      System.out.println(reName);              jf.renameTo(new File(desFilePath+reName+".jpg"));              } catch (MetadataException e) {// TODO Auto-generated catch blocke.printStackTrace();}            }else{         System.out.println("没有exif信息：    "+filePath);                  }} catch (JpegProcessingException e) {// TODO Auto-generated catch blocke.printStackTrace();}         }public static void main(String[] args) {// TODO Auto-generated method stubReNamePic rep=new ReNamePic("C:/Documents and Settings/Administrator/桌面/文件/","C:/Documents and Settings/Administrator/桌面/文件2/");rep.run("");    }}