java-> 利用IO操作与递归实现目录的复制

 1 public class CopyDir {
 2 
 3     public static void main(String[] args) {
 4         copyDir(new File("d:\a"), new File("d:\b"));
 5     }
 6     
 7     
 8     //file1为被复制目录， file2为目标目录
 9     public static void copyDir(File file1 ,File file2) {
10         //目标目录不存在则创建
11         if(!file2.exists()) {
12             file2.mkdir();
13         }
14         //将源目录所有对象取出存入File[]数组中
15         File[] fList =file1.listFiles();
16         //遍历源目录
17         for (File f : fList) {
18             //当子对象为目录时在目标目录中创建此目录
19             if(f.isDirectory()) {
20                 File file =new File(file2,f.getName());
21                 file.mkdir();
22                 //调用自己
23                 copyDir(f, file);
24             }else if(f.isFile()) {
25                 //当子对象为文件时用字节流读取并写入目标目录中（复制）
26                 BufferedInputStream bis = null ;
27                 BufferedOutputStream bos = null;
28                 try {
29                     bis = new BufferedInputStream(new FileInputStream(f));
30                     bos = new BufferedOutputStream(new FileOutputStream(new File(file2,f.getName())));
31                     int len = 0;
32                     byte[] bytes = new byte[1024];
33                     while((len = bis.read(bytes)) != -1) {
34                         bos.write(bytes, 0, len);
35                     }
36                 } catch (IOException e) {
37                     throw new RuntimeException("操作失败！");
38                 }finally {
39                     try {
40                         bis.close();
41                         bos.close();
42                     } catch (IOException e) {
43                         throw new RuntimeException("关闭失败！");
44                     }        
45                 }        
46             }
47         }
48     }
49 }