疯狂Java讲义习题11.3

题目描述：
实现一个工具类，该工具可实现copy功能，若被copy的对象是文件，程序将制定文件复制到制定目录下，如过被copy对象是目录，程序应将该目录及其目录下的所有文件复制到指令目录下。 
代码如下：

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1. import java.io.*;
   
2. public class cpft
   
3. {
   
4.     public static void copyFile(String dst,String src) throws IOException
   
5.     {
   
6.         FileOutputStream fos = null;
   
7.         FileInputStream fis = null;    
   
8.             fos = new FileOutputStream(dst+"\\"+src.substring(src.lastIndexOf('\\')+1));
   
9.             fis = new FileInputStream(src);
   
10.             int hasRead = 0;
    
11.             byte[] bbuf = new byte[1024];
    
12.             while ((hasRead = fis.read(bbuf)) > 0)
    
13.             {
    
14.                 
    
15.                 fos.write(bbuf,0,hasRead);
    
16.             }
    
17.         
    
18.     }
    
19.     public static void copy(String dst,String src) throws IOException
    
20.     {
    
21.         File newFile = new File(src);
    
22.         File[] fileList = newFile.listFiles();
    
23.         //File dstFile = new File(dst+"//"+newFile.getName());
    
24.         if (newFile.isFile())
    
25.         {
    
26.             
    
27.             copyFile(dst,src);
    
28.         }
    
29.         else
    
30.         {
    
31.             File dstFile = new File(dst+"//"+newFile.getName());
    
32.             if (!dstFile.exists())
    
33.             {
    
34.                 dstFile.mkdirs();
    
35.             }
    
36.             for (File file:fileList)
    
37.             {
    
38.                 if (file.isFile())
    
39.                         copyFile(dstFile.getAbsolutePath(),file.getAbsolutePath());
    
40.                 else
    
41.                         copy(dstFile.getAbsolutePath(),file.getAbsolutePath());
    
42.             }            
    
43.         }
    
44.     }
    
45.     public static void main(String[] args) throws IOException
    
46.     {
    
47.         
    
48.         String src = "F:\\paper";
    
49.         String dst = "F:\\冰点文库";
    
50.         copy(dst,src);
    
51.         System.out.println("finished Copy");
    
52.     }
    
53. }

运行结果：（完成复制）
finished Copy