如题：
/** * 将单级目录H:\\aa 目录下，.java 复制到 h:\\bb,并重命名为.jdg文件 * @author ZYxiao * */ public class FileCopyRename { public static void main(String[] args) throws IOException{ File inputFile = new File("h:\\aa"); File outputFileFolder = new File("h:\\bb"); if(!outputFileFolder.exists()){ outputFileFolder.mkdir(); //若没有指定文件夹，就创建 } File[] files = inputFile.listFiles(new FilenameFilter() { //条件判断子目录 @Override public boolean accept(File dir, String name) { // TODO Auto-generated method stub return new File(dir,name).isFile() && name.endsWith(".java"); } }); for (File file : files) { String name = file.getName(); File outputFile = new File(outputFileFolder,name); copyFile(file,outputFile); } files = outputFileFolder.listFiles(); //获取复制完的目标目录下的子文件 for (File file : files) { renameFile(outputFileFolder,file); } } private static void renameFile(File outputFileFolder, File file) { // TODO Auto-generated method stub String name = file.getName().replace(".java", ".jdg"); File newNameFile =new File(outputFileFolder,name); file.renameTo(newNameFile); } private static void copyFile(File inputFile, File outputFile) throws IOException { // TODO Auto-generated method stub BufferedInputStream bis=new BufferedInputStream(new FileInputStream(inputFile)); BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(outputFile)); byte[] b=new byte[1024]; int len=0; while((len = bis.read(b))!= -1){ bos.write(b, 0, len); } bis.close(); bos.close(); } }