java 复制文件的方法

使用文件通道的方法进行文件复制

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1. public void fileChannelCopy(File s, File t) {
   
2. 
   
3.         FileInputStream fi = null;
   
4. 
   
5.         FileOutputStream fo = null;
   
6. 
   
7.         FileChannel in = null;
   
8. 
   
9.         FileChannel out = null;
   
10. 
    
11.         try {
    
12. 
    
13.             fi = new FileInputStream(s);
    
14. 
    
15.             fo = new FileOutputStream(t);
    
16. 
    
17.             in = fi.getChannel();//得到对应的文件通道
    
18. 
    
19.             out = fo.getChannel();//得到对应的文件通道
    
20. 
    
21.             in.transferTo(0, in.size(), out);//连接两个通道，并且从in通道读取，然后写入out通道
    
22. 
    
23.         } catch (IOException e) {
    
24. 
    
25.             e.printStackTrace();
    
26. 
    
27.         } finally {
    
28. 
    
29.             try {
    
30. 
    
31.                 fi.close();
    
32. 
    
33.                 in.close();
    
34. 
    
35.                 fo.close();
    
36. 
    
37.                 out.close();
    
38. 
    
39.             } catch (IOException e) {
    
40. 
    
41.                 e.printStackTrace();
    
42. 
    
43.             }
    
44. 
    
45.         }
    
46. 
    
47.     }

以文件缓冲区的方式进行文件复制

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1. private boolean copyFile (String fileFrom, String fileTo) {
   
2.         try {
   
3.             FileInputStream in = new java.io.FileInputStream(fileFrom);
   
4.             FileOutputStream out = new FileOutputStream(fileTo);
   
5.             byte[] bt = new byte[1024];
   
6.             int count;
   
7.             while ((count = in.read(bt)) > 0) {
   
8.                 out.write(bt, 0, count);
   
9.             }
   
10.             in.close();
    
11.             out.close();
    
12.             return true;
    
13.         } catch (IOException ex) {
    
14.             return false;
    
15.         }
    
16.     }