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java学习笔记: 实现简易局域网聊天程序
Java代码- /*
- 使用UDP模式,编写一个聊天程序
- 有发送和接收数据2部分,
- 一个线程接收,一个线程发送
-
- 由于发送和接收动作是不一致的,所以要使用2个run方法
- 而且这两个方法要封装到不同的类中
-
- 本程序忽略了部分异常的处理,也未加入UI组件
- 这样比较简洁
-
- 发送端口9998
- 接受端口9999
- 用的是局域网广播地址,所以自己发的消息自己也收到了
-
- [示例]:简易控制台聊天程序
- */
- import java.net.*;
- import java.io.*;
- class Demo
- {
- public static void main(String[] args) throws Exception
- {
- DatagramSocket sendSocket = new DatagramSocket(9998); //发送端
- DatagramSocket receSocket = new DatagramSocket(9999); //接收端
- new Thread(new MsgSend(sendSocket)).start(); //发送线程
- new Thread(new MsgRece(receSocket)).start(); //接受线程
- }
- }
-
- class MsgSend implements Runnable //发送
- {
- private DatagramSocket dsock;
- public MsgSend(DatagramSocket dsock)
- {
- this.dsock= dsock;
- }
-
- public void run()
- {
- BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
- String lineStr = null;
- try
- {
- while(true)
- {
- lineStr = bufr.readLine();
- if(lineStr!=null)
- {
- if(lineStr.equals("over886"))
- {
- break;
- }
- else
- {
- byte[] dataBuf = lineStr.getBytes();
- DatagramPacket dataPack = //数据打包
- new DatagramPacket( dataBuf,
- dataBuf.length,
- InetAddress.getByName("192.168.1.255"), //广播
- 9999 //目标端口
- );
- dsock.send(dataPack);
- }
- }
- }
- bufr.close();
- dsock.close();
- }
- catch(Exception e)
- {
- throw new RuntimeException("发送失败!");
- }
- }
- }
-
- class MsgRece implements Runnable //接收
- {
- private DatagramSocket dsock;
- public MsgRece(DatagramSocket dsock)
- {
- this.dsock= dsock;
- }
-
- public void run()
- {
- try
- {
- while(true)
- {
- byte[] dataBuf = new byte[1024];
- DatagramPacket dataPack = new DatagramPacket(dataBuf,dataBuf.length);
- dsock.receive(dataPack); //将获取的数据保存到指定的数据包
- String ip = dataPack.getAddress().getHostAddress();
- String data = new String(dataPack.getData(),0,dataPack.getLength());
- int port = dataPack.getPort();
- System.out.println();
- System.out.println("来自ip为 "+ip+" <对方端口>: "+port+" 的消息");
- System.out.println(data);
- }
- }
- catch(Exception e)
- {
- throw new RuntimeException("接受失败!");
- }
- finally
- {
- dsock.close();
- }
- }
- }
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