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/IBM_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();
	}
}