本文實例為大家分享了Java實現多線程在線聊天的具體代碼，供大家參考，具體內容如下

上一篇博客通過UDP實現了聊天，但只能單方面發送消息，這次實現了多線程在線聊天，也就是可以雙方互發消息。

發送消息：

1. package com.kuang.chat;
2.  
3. import java.io.BufferedReader;
4. import java.io.IOException;
5. import java.io.InputStreamReader;
6. import java.net.DatagramPacket;
7. import java.net.DatagramSocket;
8. import java.net.InetSocketAddress;
9. import java.net.SocketException;
10.  
11. public class TalkSend implements Runnable {
12. DatagramSocket socket = null;
13. BufferedReader reader = null;
14.  
15. private int fromPort;
16. private String toIP;
17. private int toPort;
18.  
19. public TalkSend(int fromPort, String toIP, int toPort) {
20. this.fromPort = fromPort;
21. this.toIP = toIP;
22. this.toPort = toPort;
23.  
24. try {
25. socket = new DatagramSocket(fromPort);
26. reader = new BufferedReader(new InputStreamReader(System.in));
27. } catch (Exception e) {
28. e.printStackTrace();
29. }
30. }
31.  
32. @Override
33. public void run() {
34. while (true) {
35. try {
36. String data = reader.readLine();
37. byte[] datas = data.getBytes();
38. DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toIP,this.toPort));
39.  
40. socket.send(packet);
41. if (data.equals("bye")) {
42. break;
43. }
44. } catch (IOException e) {
45. e.printStackTrace();
46. }
47. }
48. socket.close();
49. }
50. }

接收消息：

1. package com.kuang.chat;
2.  
3. import java.io.IOException;
4. import java.net.DatagramPacket;
5. import java.net.DatagramSocket;
6. import java.net.SocketException;
7.  
8. public class TalkReceive implements Runnable {
9. DatagramSocket socket = null;
10. private int port;
11. private String msgFrom;
12.  
13. public TalkReceive(int port,String msgFrom) {
14. this.port = port;
15. this.msgFrom = msgFrom;
16. try {
17. socket = new DatagramSocket(port);
18. } catch (SocketException e) {
19. e.printStackTrace();
20. }
21. }
22.  
23. @Override
24. public void run() {
25.  
26. while (true) {
27. try {
28. //準備接收數據
29. byte[] container = new byte[1024];
30. DatagramPacket packet = new DatagramPacket(container,0,container.length);
31. socket.receive(packet);//阻塞式接受包裹
32.  
33. //斷開連接 bye
34. byte[] data = packet.getData();
35. String receiveData = new String(data,0,data.length);
36.  
37. System.out.println(msgFrom + ":" +receiveData);
38. if (receiveData.equals("bye")) {
39. break;
40. }
41. } catch (IOException e) {
42. e.printStackTrace();
43. }
44. }
45. socket.close();
46. }
47. }

用戶1：學生

1. package com.kuang.chat;
2.  
3. public class TalkStudent {
4. public static void main(String[] args) {
5. //開啟兩個線程
6. new Thread(new TalkSend(7777,"localhost",9999)).start();
7. new Thread(new TalkReceive(8888,"老師")).start();
8. }
9. }

用戶2：老師

1. package com.kuang.chat;
2.  
3. public class TalkTeacher {
4. public static void main(String[] args) {
5. new Thread(new TalkSend(5555,"localhost",8888)).start();
6. new Thread(new TalkReceive(9999,"學生")).start();
7. }
8. }

運行結果：

1、啟動學生端，開始運行

2、啟動教師端，開始運行

3、學生發送消息，教師收到

4、教師發送消息，學生收到

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持我們。

原文鏈接：https://blog.csdn.net/weixin_44668898/article/details/107319623