java文件搜索 public void getDir(String strPath) throws Exception { try { File f=new File(strPath); if(f.isDirectory()) { File[] fList=f.listFiles(); for(int j=0;j<fList.length;j++) { if(fList[j].isDirectory()) { System.out.println(fList[j].getPath()); getDir(fList[j].getPath()); //在getDir函数里面又调用了getDir函数本身 } } for(int j=0;j<fList.length;j++) { if(fList[j].isFile()) { System.out.println(fList[j].getPath());//把这话换成你要处理的语句.比如 fList[j].substring(fList[j].length-3,3)=="txt" } } } } catch(Exception e) { e.printStackTrace(); } } java 文件与文件夹拷贝 File fileOld = new File(pathOld); File fileNew = new File(pathNew); if(fileOld.exists()){ try { FileInputStream fis = new FileInputStream(fileOld); FileOutputStream fos = new FileOutputStream(fileNew); int read = 0; while ((read = fis.read()) != -1) { fos.write(read); fos.flush(); } fos.close(); fis.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } java文件重命名 File file = new File("D:\\123.txt"); if(file.exists()) { file.renameTo(new File("D:\\1234.txt")); }