java——拷贝文件夹方法

 public void copyFolder(String oldPath, String newPath) {
        try {
            (new File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹
            File a=new File(oldPath);
            String[] file=a.list();
            File temp=null;
            for (int i = 0; i < file.length; i++) {
                if(oldPath.endsWith(File.separator)){
                    temp=new File(oldPath+file[i]);
                }
                else{
                    temp=new File(oldPath+File.separator+file[i]);
                }   

                if(temp.isFile()){
                    FileInputStream input = new FileInputStream(temp);
                    FileOutputStream output = new FileOutputStream(newPath + "/" +
                            (temp.getName()).toString());
                    byte[] b = new byte[1024 * 5];
                    int len;
                    while ( (len = input.read(b)) != -1) {
                        output.write(b, 0, len);
                    }
                    output.flush();
                    output.close();
                    input.close();
                }
                if(temp.isDirectory()){//如果是子文件夹
                    copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);
                }
            }
        }
        catch (Exception e) {
            System.out.println("复制整个文件夹内容操作出错");
            e.printStackTrace();
        }
    }