java 高效率文件复制

 1 　　　　　　　　　 File sourFile = new File(start);　　//来源文件
 2                 File tarFile = new File(end); 4                 if(!tarFile.exists()){
 5                     tarFile.mkdirs();
 6                 }10                 if(!sourFile.exists()){
11                     System.out.println("跳出本次循环"+start);
12                     continue;
13                 }
16                 FileInputStream fis = null;
17                 FileOutputStream fos = null;19                 FileChannel in = null;
20                 FileChannel out = null;22                 try {
23                     
24                      
25                     fis = new FileInputStream(new File(start));
26                     fos = new FileOutputStream(new File(end+imagess));28                     
29                     in = fis.getChannel();
30                     out = fos.getChannel();
31                     smallOut = smallFos.getChannel();
32                     
33                     in.transferTo(0, in.size(), out);35                 } catch (Exception e) {
36                     e.printStackTrace();
37                 }finally{
38                     in.close();40                     out.close();42                     fos.close();
43                     fis.close();
44                 }