【转】javaUDP套接字通信

Java UDP网络编程 - 最简单示例

 

转自 http://blog.csdn.net/wintys/article/details/3525643

1. /**
2. *UDPServer
3. *@author Winty wintys@gmail.com
4. *@version 2008-12-15
5. */
6. import java.io.*;
7. import java.net.*;
8. class UDPServer{
9. publicstaticvoid main(String[] args)throws IOException{
10. DatagramSocket server = new DatagramSocket(5050);
11. byte[] recvBuf = newbyte[100];
12. DatagramPacket recvPacket
13. = new DatagramPacket(recvBuf , recvBuf.length);
14. server.receive(recvPacket);
15. String recvStr = new String(recvPacket.getData() , 0 , recvPacket.getLength());
16. System.out.println("Hello World!" + recvStr);
17. int port = recvPacket.getPort();
18. InetAddress addr = recvPacket.getAddress();
19. String sendStr = "Hello ! I'm Server";
20. byte[] sendBuf;
21. sendBuf = sendStr.getBytes();
22. DatagramPacket sendPacket
23. = new DatagramPacket(sendBuf , sendBuf.length , addr , port );
24. server.send(sendPacket);
25. server.close();
26. }
27. }

1. /**
2. *UDPClient
3. *@author Winty wintys@gmail.com
4. *@version 2008-12-15
5. */
6. import java.io.*;
7. import java.net.*;
8. class UDPClient{
9. publicstaticvoid main(String[] args)throws IOException{
10. DatagramSocket client = new DatagramSocket();
11. String sendStr = "Hello! I'm Client";
12. byte[] sendBuf;
13. sendBuf = sendStr.getBytes();
14. InetAddress addr = InetAddress.getByName("127.0.0.1");
15. int port = 5050;
16. DatagramPacket sendPacket
17. = new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
18. client.send(sendPacket);
19. byte[] recvBuf = newbyte[100];
20. DatagramPacket recvPacket
21. = new DatagramPacket(recvBuf , recvBuf.length);
22. client.receive(recvPacket);
23. String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
24. System.out.println("收到:" + recvStr);
25. client.close();
26. }
27. }