nio通道通信实现的文件复制

Posted 2021-01-05 kill-9

 1 package edzy.nio;
 2 
 3 import org.junit.Test;
 4 
 5 import java.io.FileInputStream;
 6 import java.io.FileOutputStream;
 7 import java.io.IOException;
 8 import java.nio.ByteBuffer;
 9 import java.nio.MappedByteBuffer;
10 import java.nio.channels.FileChannel;
11 import java.nio.file.Paths;
12 import java.nio.file.StandardOpenOption;
13 
14 public class Channel {
15  @Test
16     public void transfer(){
17         FileChannel in = null;
18         FileChannel out = null;
19         try {
20             in = FileChannel.open(Paths.get("./src/main/java/edzy/nio/s.jpg"),StandardOpenOption.READ);
21             out = FileChannel.open(Paths.get("./src/main/java/edzy/nio/s5.jpg"),StandardOpenOption.READ,StandardOpenOption.WRITE,StandardOpenOption.CREATE_NEW);
22             //nio通道通信
　　　　　　　　　out.transferFrom(in,0,in.size());
23 
24         } catch (IOException e) {
25             e.printStackTrace();
26         }finally {
27             if(out != null){
28                 try {
29                     out.close();
30                 } catch (IOException e) {
31                     e.printStackTrace();
32                 }
33             }
34 
35             if(in != null){
36                 try {
37                     in.close();
38                 } catch (IOException e) {
39                     e.printStackTrace();
40                 }
41             }
42 
43 
44         }
45     }
46 
47 
48 }