统一批量修改照片名字

在给小宝拍的照片中，有我手机拍的，有媳妇手机拍的，还有相机拍的，于是每个月给小宝选的30张照片中，文件命名很乱。现在根据文件修改属性，统一按时间戳命名，精确到秒。

程序如下：（程序规模小，因此未考虑潜在的重名问题）

import java.io.File;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
  
public class UpdateFileName {  
    private static final String dir = "C:/Documents and Settings/Administrator/My Documents/My Pictures/dir/";  
  
    public static void updateName() {  
        File fdir = new File(dir);  
        File[] list = fdir.listFiles();  
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH.mm.ss");  
          
        for (File f : list) {  
            if (f.isFile() && f.getName().toUpperCase().endsWith(".JPG")) {  
                Date date = new Date(f.lastModified());  
                String newName = sdf.format(date);  
                  
                System.out.print(f.getName() + "\t");  
                System.out.println(newName + ".jpg");  
  
                f.renameTo(new File(dir + newName + ".jpg"));  
            }  
        }  
    }  
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        updateName();  
    }  
}

即使就是今天，还是遇到了同名的问题，可见，作为一个合格而严谨的代码工，一定不能心存任何侥幸。程序更新如下，对于同一秒拍摄的照片，使用毫秒级的时间戳加6位随机整数来命名，以此解决上面程序的同名问题：

import java.io.File;  
import java.text.SimpleDateFormat;  
import java.util.Date;  
import java.util.HashMap;  
import java.util.Random;  
  
public class UpdateFileName {  
    private static final String PROCESS_DIR = "C:/Documents and Settings/Administrator/My Documents/My Pictures/dir/";  
    private static final Random RANDOM = new Random();  
      
    /** 
     * update the picture file names 
     */  
    public static void updateName() {  
        File fdir = new File(PROCESS_DIR);  
        File[] list = fdir.listFiles();  
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH.mm.ss");  
          
        // 需要考虑重名文件问题  

        HashMap<String, Integer> fileAllNames = new HashMap<String, Integer>();  
        SimpleDateFormat sdfAnother = new SimpleDateFormat("yyyy-MM-dd HH.mm.ss.SSS");  
          
        for (File f : list) {  
            if (f.isFile() && f.getName().toUpperCase().endsWith(".JPG")) {  
                Date date = new Date(f.lastModified());  
                String newName = sdf.format(date);  
                  
                if (fileAllNames.containsKey(newName) ){ // 有重名的  

                    newName = sdfAnother.format(date);  
                    int rint = RANDOM.nextInt(999999-100000+1)+100000 ; // get a number between [a,b]  

                    newName = newName + "."+ String.valueOf(rint);  
                }  
                  
                fileAllNames.put(newName, 1);  
                  
                System.out.print(f.getName() + "\t\t\t");  
                System.out.println(newName + ".jpg");  
  
                boolean succeed = f.renameTo(new File(PROCESS_DIR + newName + ".jpg"));  
                  
                if (!succeed) {  
                    System.err.println("Rename failed: New File Name - " + newName);  
                }  
            }  
        }  
    }  
       
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        updateName();  
    }  
}

程序再次更新，源于变态的apple使用iTunes导出文件，导致modified date time跟拍摄时间不一致。下面程序读取Exif信息做为拍摄时间，需要导入外部JAR包 metadata-extractor-2.4.0-beta-1.jar

import java.io.File;  
import java.util.HashMap;  
import java.util.Random;  
  
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.exif.ExifDirectory;  
  
public class UpdateJPGNameWithTimeStamp {  
    private static final String PROCESS_DIR = "C:/Users/ADMIN/Pictures/11/";  
    private static final Random RANDOM = new Random();  
    private static String model = "";  
  
    public static String findEXIFDateTime(File jpegFile) {  
        Metadata metadata;  
        try {  
            metadata = JpegMetadataReader.readMetadata(jpegFile);  
            Directory exif = metadata.getDirectory(ExifDirectory.class);  
            String newname = exif  
                    .getDescription(ExifDirectory.TAG_DATETIME_ORIGINAL);  
            // System.out.println(newname);  

            if (newname!=null && newname.contains(":")){  
                newname = newname.replaceFirst(":", "-");  
                newname = newname.replaceFirst(":", "-");  
                newname = newname.replaceFirst(":", ".");  
                newname = newname.replaceFirst(":", ".");  
                newname = newname.replaceFirst(":", ".");  
            }  
            model = exif.getDescription(ExifDirectory.TAG_MODEL);  
            // System.out.println(exif.getDescription(ExifDirectory.TAG_EXIF_VERSION));  

            return newname;  
        } catch (JpegProcessingException e) {  
            e.printStackTrace();  
        } catch (MetadataException e) {  
            e.printStackTrace();  
        }  
  
        return null;  
    }  
  
    public static void updateAll() {  
        File fdir = new File(PROCESS_DIR);  
        File[] list = fdir.listFiles();  
        // 需要考虑重名文件问题  

        HashMap<String, Integer> fileAllNames = new HashMap<String, Integer>();  
  
        for (File f : list) {  
            if (f.isFile() && f.getName().toUpperCase().endsWith(".JPG")) {  
                String newName = findEXIFDateTime(f);  
                  
                if (newName == null || newName.equals("")) {  
                    continue;  
                }  
                  
                if (fileAllNames.containsKey(newName + ".jpg")) { // 有重名的  

                    int rint = RANDOM.nextInt(999999 - 100000 + 1) + 100000;  
                    newName = newName + "." + String.valueOf(rint);  
                }  
                  
                newName = newName + ".jpg";  
                fileAllNames.put(newName, 1);  
  
                System.out.print("Old name: " + f.getName() + "\t");  
                System.out.print("New name: " + newName + "\t");  
                System.out.println("by " + model);  
  
                boolean succeed = f.renameTo(new File(PROCESS_DIR + newName));  
  
                if (!succeed) {  
                    System.err.println("Rename failed: New File Name - "  
                            + newName);  
                }  
            }  
        }  
        System.out.println("Done! Totally updated " + fileAllNames.keySet().size() );  
    }  
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        UpdateJPGNameWithTimeStamp.updateAll();  
    }  
}