java-> 利用IO操作与递归实现目录的复制

 public class CopyDir {

     public static void main(String[] args) {
         copyDir(new File("d:\\a"), new File("d:\\b"));
     }

     //file1为被复制目录， file2为目标目录
     public static void copyDir(File file1 ,File file2) {
         //目标目录不存在则创建
         if(!file2.exists()) {
             file2.mkdir();
         }
         //将源目录所有对象取出存入File[]数组中
         File[] fList =file1.listFiles();
         //遍历源目录
         for (File f : fList) {
             //当子对象为目录时在目标目录中创建此目录
             if(f.isDirectory()) {
                 File file =new File(file2,f.getName());
                 file.mkdir();
                 //调用自己
                 copyDir(f, file);
             }else if(f.isFile()) {
                 //当子对象为文件时用字节流读取并写入目标目录中（复制）
                 BufferedInputStream bis = null ;
                 BufferedOutputStream bos = null;
                 try {
                     bis = new BufferedInputStream(new FileInputStream(f));
                     bos = new BufferedOutputStream(new FileOutputStream(new File(file2,f.getName())));
                     int len = 0;
                     byte[] bytes = new byte[1024];
                     while((len = bis.read(bytes)) != -1) {
                         bos.write(bytes, 0, len);
                     }
                 } catch (IOException e) {
                     throw new RuntimeException("操作失败！");
                 }finally {
                     try {
                         bis.close();
                         bos.close();
                     } catch (IOException e) {
                         throw new RuntimeException("关闭失败！");
                     }
                 }
             }
         }
     }
 }