UDP---编写一个聊天程序

超、凢脫俗 2021-09-15 09:08 372阅读 0赞

**需求：编写一个聊天程序；**

**功能：** 有接收数据的部分，有发送数据的部分，这两部分需要同时执行，也就是说需要用到多线程技术。一个线程控制数据的接收，另一个线程控制数据的发送。

>     import java.io.BufferedReader;
>     import java.io.InputStreamReader;
>     import java.net.DatagramPacket;
>     import java.net.DatagramSocket;
>     import java.net.InetAddress;
>     import java.net.SocketException;
>     
>     public class ChatDemo {
>     
>     	public static void main(String[] args) throws SocketException {
>     		DatagramSocket sendSocket=new DatagramSocket();
>     		DatagramSocket reciveSocket=new DatagramSocket(10001);
>     		
>     		new Thread(new Send(sendSocket)).start();
>     		new Thread(new Recive(reciveSocket)).start();
>     		
>     	}
>     }
>     
>     //因为接收和发送是不一致，所有要定义两个run方法。而且这两个方法要封装到不同的类中。
>     class Send implements Runnable{
>     	private DatagramSocket ds;
>     	Send(DatagramSocket ds){
>     		this.ds=ds;
>     	}
>     	
>     	public void run() {
>     		try {
>     			BufferedReader buff=new BufferedReader(new InputStreamReader(System.in));
>     			
>     			String line=null;
>     			
>     			while((line=buff.readLine())!=null){
>     				if("886".equals(line))
>     					break;
>     				byte[] buf=line.getBytes();
>     				DatagramPacket dp=new DatagramPacket(buf, buf.length,InetAddress.getByName("10.1.9.34"),10001);
>     				ds.send(dp);
>     			}
>     			
>     		} catch (Exception e) {
>     			throw new RuntimeException("发送端失败！");
>     		}
>     		
>     	}
>     }
>     
>     class Recive implements Runnable{
>     	private DatagramSocket ds;
>     	Recive(DatagramSocket ds){
>     		this.ds=ds;
>     	}
>     	
>     	public void run() {
>     		try {
>     			while(true){
>     				byte[] buf=new byte[1024];
>     				DatagramPacket dp=new DatagramPacket(buf, buf.length);
>     				
>     				ds.receive(dp);
>     				
>     				String ip=dp.getAddress().getHostAddress();
>     				String data=new String(dp.getData(),0,dp.getLength());
>     				
>     				System.out.println(ip+"::"+data);
>     			}
>     			
>     		} catch (Exception e) {
>     			throw new RuntimeException("接收端失败！");
>     		}
>     	}
>     	
>     }
> 
> 运行结果为：

> > ![20180503195158574][]  
> >

[20180503195158574]: /images/20210720/678334ffb1534221816b56a7f95e1fef.png