UDP聊天室（代码）

我们已经了解了UDP的协议，那么现在我们就简单的做一个UDP的聊天室

我们定义一个 UDPChatDemo类，里面有主方法，还定义一个发送端的线程类SendThread，为了记录名字，所以用继承方式，一个接收端的线程类Receive，主线程启动1个接收端，2个发送端。

package com.wangLuo;

import java.io.*;
import java.net.*;
import java.util.Date;

/**
 * @author 林高禄
 * @create 2020-05-21-17:32
 */
public class UDPChatDemo{

    public static void main(String[] args) {

        Receive receive = new Receive();
        Thread thread = new Thread(receive);
        thread.setPriority(10);
        thread.start();
        createSent("林高禄");
        createSent("徐辉强");

    }
    public static void createSent(String name){
        SendThread sendThread = new SendThread(name);
        sendThread.start();
    }
}

class SendThread extends Thread{
    
    public SendThread(String name) {
        super(name);
    }

    @Override
    public void run() {
        try {
            send();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void send() throws IOException {
        DatagramSocket ds = new DatagramSocket();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line;
        while((line = br.readLine())!= null){
            String newLine = Thread.currentThread().getName()+"--"+new Date().toString()+"\n\r"+line;
            byte[] bytes = newLine.getBytes();
            DatagramPacket dp = new DatagramPacket(bytes,bytes.length, InetAddress.getByName("192.168.1.55"),10);
            ds.send(dp);
            if("6了".equals(line)){
                break;
            }
        }
        ds.close();
    }

}

class Receive implements Runnable{

    @Override
    public void run() {
        try {
            receive();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void receive() throws IOException {
        DatagramSocket ds = new DatagramSocket(10);
        while(true){
            byte[] bys = new byte[1024];
            DatagramPacket dp = new DatagramPacket(bys,bys.length);
            ds.receive(dp);
            byte[] data = dp.getData();
            int length = dp.getLength();
            System.out.println(new String(data,0,length));
        }
    }
}

 聊天记录：

 

灰色的字是键盘输入的，白色的字是接收端输出的，这个聊天记录有点乱，还有空行什么的，是因为我们是用多线程来做，键盘输入的时候线程时随机的，并且输入完毕的时候，不一定到接收线程接收，有可能是另一个客户端线程，所以会出现这种情况，如果想改进，那就得把客户端单独拿出来另一个主方法，我们修改一下

接收端代码

package com.wangLuo;

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

/**
 * @author 林高禄
 * @create 2020-05-22-17:18
 */
public class Receive {

    public static void main(String[] args) throws IOException {
        Receive receive = new Receive();
        receive.receive();
    }

    private void receive() throws IOException {
        DatagramSocket ds = new DatagramSocket(10);
        while(true){
            byte[] bys = new byte[1024];
            DatagramPacket dp = new DatagramPacket(bys,bys.length);
            ds.receive(dp);
            byte[] data = dp.getData();
            int length = dp.getLength();
            System.out.println(new String(data,0,length));
        }
    }
}

客户端（发送端）代码

package com.wangLuo;

import java.io.*;
import java.net.*;
import java.util.Date;

/**
 * @author 林高禄
 * @create 2020-05-22-16:56
 */
public class Send {

    private String name;
    public Send(String name) {
        this.name = name;
    }

    public static void main(String[] args) throws IOException {
        Send send = new Send("林高禄");
        send.send();
    }
    private void send() throws IOException {
        DatagramSocket ds = new DatagramSocket();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line;
        while((line = br.readLine())!= null){
            String newLine = this.getName()+"--"+new Date().toString()+"\n\r"+line;
            byte[] bytes = newLine.getBytes();
            DatagramPacket dp = new DatagramPacket(bytes,bytes.length, InetAddress.getByName("192.168.1.55"),10);
            ds.send(dp);
            if("6了".equals(line)){
                break;
            }
        }
        ds.close();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

启动接收端，启动客户端，然后把客户端的名字改一下，再启动一次客户端，此时一共启动了2个客户端

package com.wangLuo;

import java.io.*;
import java.net.*;
import java.util.Date;

/**
 * @author 林高禄
 * @create 2020-05-22-16:56
 */
public class Send {

    private String name;
    public Send(String name) {
        this.name = name;
    }

    public static void main(String[] args) throws IOException {
        Send send = new Send("徐辉强");
        send.send();
    }
    private void send() throws IOException {
        DatagramSocket ds = new DatagramSocket();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line;
        while((line = br.readLine())!= null){
            String newLine = this.getName()+"--"+new Date().toString()+"\n\r"+line;
            byte[] bytes = newLine.getBytes();
            DatagramPacket dp = new DatagramPacket(bytes,bytes.length, InetAddress.getByName("192.168.1.55"),10);
            ds.send(dp);
            if("6了".equals(line)){
                break;
            }
        }
        ds.close();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

那么就进入连天了，以下是聊天记录

客户端的记录：

 

接收端的聊天记录：