Java 基础 3 多线程和 socket 结合 ---- 聊天室

思路
1、一个线程负责发送数据。一个负责接收数据。两个任务同时执行
2、收到 over 时结束聊天

//send 
class Send implements Runnable{
   private DatagramSocket ds;
   
   public Send(DatagramSocket ds){
   	super();
   	this.ds = ds;
   	
   }
   public void run() {
   	// TODO Auto-generated method stub
      BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
   
      String line = null;
      try{
   	   while((line = bufr.readLine())!=null){
   		   //数据封装到数据包中
   		   byte[] buf = line.getBytes();
   		   DatagramPacket dp =new DatagramPacket(buf,buf.length, InetAddress.getByName("127.0.0.1"),10002);
   		   ds.send(dp);
   		   if("over".equals(line)){
   			   break;
   		   }
   	   }
   	   ds.close();
      }catch(IOException e){
   	   e.printStackTrace();
   	   
      }
   }
   
   
}

// receive



class Receive implements Runnable{
   private DatagramSocket ds;
   
   public Receive(DatagramSocket ds){
   	super();
   	this.ds = ds;
   	
   }
   public void run() {
   	while(true){
   	// TODO Auto-generated method stub
   	byte[] buf = new byte[1024];
   	
   	DatagramPacket dp = new DatagramPacket(buf, buf.length);
   	
   	try {
   		ds.receive(dp);
   	} catch (IOException e) {
   		// TODO Auto-generated catch block
   		e.printStackTrace();
   	}
   	
   	String ip = dp.getAddress().getHostAddress();
   	
   	String data = new String(dp.getData(),0,dp.getLength());
   	if("over".equals(data)){
   		System.out.println(ip+"...离开聊天室!");
   		
   	}
   	System.out.println(ip+":"+data);
   	}
   }
   
   
}



//主函数

public class ChatTest {
public static void main(String [] args) throws SocketException{
   
   DatagramSocket send =new DatagramSocket(8888);
   DatagramSocket receive = new DatagramSocket(10002);    //注意接收端端口号 与send中的相同
   
   new Thread(new Send(send)).start();
   new Thread(new Receive(receive)).start();
}
}
​