网络编程_多线程实现聊天室程序

package cn.itcast_05;

import java.io.IOException;
import java.net.DatagramSocket;

/*
 * 通过多线程改进聊天室程序,这样就可以实现在一个窗口发送和接收数据了
 */
public class ChatRoom {
  public static void main(String[] args) throws IOException {
    // 发送端对象
    DatagramSocket dsSed = new DatagramSocket();
    // 接收端对象
    DatagramSocket dsReceive = new DatagramSocket(12306);

    // 发送端
    SedThread st = new SedThread(dsSed);
    // 接收端
    ReceiveThread rt = new ReceiveThread(dsReceive);

    Thread t1 = new Thread(st);
    Thread t2 = new Thread(rt);

    // 启动线程
    t1.start();
    t2.start();
  }
}

package cn.itcast_05;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class ReceiveThread implements Runnable {
  private DatagramSocket ds;

  public ReceiveThread(DatagramSocket ds) {
    this.ds = ds;
  }

  @Override
  public void run() {
    // 创建接收数据包
    byte[] bys = new byte[1024];
    DatagramPacket dp = new DatagramPacket(bys, bys.length);

    try {
      while (true) {
        // 接收数据
        ds.receive(dp);

        // 解析数据,并显示在控制台
        String ip = dp.getAddress().getHostAddress();
        String s = new String(dp.getData(), 0, dp.getLength());
        System.out.println("form " + ip + " data is:" + s);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

package cn.itcast_05;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class SedThread implements Runnable {
  // 发送端Socket对象
  private DatagramSocket ds;

  public SedThread(DatagramSocket ds) {
    this.ds = ds;
  }

  @Override
  public void run() {
    try {
      // 键盘录入数据并打包
      BufferedReader br = new BufferedReader(new InputStreamReader(
          System.in));
      String line = null;
      while ((line = br.readLine()) != null) {
        if ("886".equals(line)) {
          break;
        }

        byte[] bys = line.getBytes();
        DatagramPacket dp = new DatagramPacket(bys, bys.length,
            InetAddress.getByName("192.168.31.255"), 12306);

        // 发送数据
        ds.send(dp);
      }

      // 释放资源
      ds.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

}