java 如何比较两个文件夹内的文件并取出修改过的文件
现有文件夹二
1．D:\\OLD\\LOOK
2. D:\\NEW\\LOOK
欲比较俩LOOK中是否有文件操作(增删改)
并将增改的文件取出存入D:\\CHECKED\\LOOK
并将需要删除的文件写入DELETE.TXT存放至D:\\CHECKED\\LOOK下
求高手
[解决办法]
import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.List;public class TestFile { /** * @param args */ public static void main(String[] args) { File folderOld = new File("C:/testF/OLD"); File folderNew = new File("C:/testF/NEW"); File folderLock = new File("C:/testF/LOCK"); File[] fielsOld = folderOld.listFiles(); File[] fielsNew = folderNew.listFiles(); List<File> add = new ArrayList<File>(); List<File> modify = new ArrayList<File>(); List<File> delete = new ArrayList<File>(); for(int i = 0; i < fielsOld.length; i++) { delete.add(fielsOld[i]); } for(int i = 0; i < fielsNew.length; i++) { int diff = 0; for(int j = 0; j < fielsOld.length; j++) { if(fielsNew[i].getName().equals(fielsOld[j].getName())){ delete.remove(j); // modify if(fielsNew[i].lastModified() != fielsOld[j].lastModified()) { modify.add(fielsNew[i]); } } else { diff++; } } // add if(fielsOld.length == diff) { add.add(fielsNew[i]); } } System.err.println(java.util.Arrays.toString(add.toArray())); System.err.println(java.util.Arrays.toString(modify.toArray())); System.err.println(java.util.Arrays.toString(delete.toArray())); if(!folderLock.exists()) { folderLock.mkdir(); } File deleteFile = new File(folderLock.getAbsolutePath() + File.separatorChar + "DELETE.TXT"); try { OutputStream out = new FileOutputStream(deleteFile); for(int i = 0; i < delete.size(); i++) { out.write((delete.get(i).getAbsolutePath() + "\n").getBytes()); } out.flush(); out.close(); // put add and modify together. add.addAll(modify); for(int i = 0; i < add.size(); i++) { InputStream in = new FileInputStream(add.get(i)); out = new FileOutputStream(folderLock.getAbsolutePath() + File.separatorChar + add.get(i).getName()); byte[] bytes = new byte[512]; while(in.read(bytes) != -1) { out.write(bytes); } out.flush(); out.close(); in.close(); } } catch (Exception e) { e.printStackTrace(); } }}