java如何使用UDP实现点对点通信

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整体的结构思路：

Stu和Tea是收发消息的两端；

Stu和Tea类都是通过启动两个线程完成通信的，这两个线程分别是发消息线程和收消息线程；

Stu类中启动的两个线程分别写在两个类里，Tea也是这样做。

Stu端及其收发消息代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
 
public class Stu {
 
    public static void main(String[] args) throws IOException {
        new Thread(new StuSendThread("127.0.0.1", 8888)).start();
        new Thread(new StuReceiverThread(8889)).start();
    }
}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
 
 
public class StuReceiverThread implements Runnable{
 
    private int port;
 
    public StuReceiverThread(int port) {
        this.port = port;
    }
    
    @Override
    public void run() {
        // 创建接收方
        DatagramSocket socket;
        try {
            socket = new DatagramSocket(port);
            while(true) {
                // 准备容器
                byte[] buf = new byte[1024];
                DatagramPacket dPacket = new DatagramPacket(buf, buf.length);
                // 阻塞式接受数据
                try {
                    socket.receive(dPacket);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                // 分析数据
                System.out.println(new String(buf));
                if (new String(buf).equals("exit")) {
                    break;
                }
            }
            // 释放资源
            socket.close();
        } catch (SocketException e1) {
            e1.printStackTrace();
        }        
    }    
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
 
public class StuSendThread implements Runnable{
 
    private DatagramSocket socket;
    private BufferedReader br;
    String IP;
    int port;
    
    public StuSendThread(String IP, int port) throws SocketException {
        socket = new DatagramSocket();
        br = new BufferedReader(new InputStreamReader(System.in));
        this.IP = IP;
        this.port = port;
    }
    
    @Override
    public void run() {        
        while(true) {
            // 准备数据
            br = new BufferedReader(new InputStreamReader(System.in));
            String msg;
            try {
                msg = br.readLine();
                byte[] data = msg.getBytes();
                // 封装数据
                DatagramPacket dPacket = new DatagramPacket(data, data.length, InetAddress.getByName(IP), port);
                // 发送数据
                socket.send(dPacket);
                if(msg.equals("exit")) {
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            
        }
        
        // 关闭资源
        try {
            br.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
 
}

Tea端及其收发消息代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
 
public class TeaSendThread implements Runnable{
    private DatagramSocket socket;
    private BufferedReader br;
    String IP;
    int port;
 
    public TeaSendThread(String IP, int port) throws SocketException {
        socket = new DatagramSocket();
        br = new BufferedReader(new InputStreamReader(System.in));
        this.IP = IP;
        this.port = port;
    }
 
    @Override
    public void run() {
        while (true) {
            // 准备数据
            br = new BufferedReader(new InputStreamReader(System.in));
            String msg;
            try {
                msg = br.readLine();
                byte[] data = msg.getBytes();
                // 封装数据
                DatagramPacket dPacket = new DatagramPacket(data, data.length, InetAddress.getByName(IP), port);
                // 发送数据
                socket.send(dPacket);
                if (msg.equals("exit")) {
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
 
        }
 
        // 关闭资源
        try {
            br.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
    }
 
}

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
 
public class TeaReceiverTread implements Runnable{
    private int port;
 
    public TeaReceiverTread(int port) {
        this.port = port;
    }
    
    @Override
    public void run() {
        // 创建接收方
        DatagramSocket socket;
        try {
            socket = new DatagramSocket(port);
            while(true) {
                // 准备容器
                byte[] buf = new byte[1024];
                DatagramPacket dPacket = new DatagramPacket(buf, buf.length);
                // 阻塞式接受数据
                try {
                    socket.receive(dPacket);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                // 分析数据
                System.out.println(new String(buf));
                if (new String(buf).equals("exit")) {
                    break;
                }
            }
            // 释放资源
            socket.close();
        } catch (SocketException e1) {
            e1.printStackTrace();
        }        
    }    
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
 
public class TeaSendThread implements Runnable{
    private DatagramSocket socket;
    private BufferedReader br;
    String IP;
    int port;
 
    public TeaSendThread(String IP, int port) throws SocketException {
        socket = new DatagramSocket();
        br = new BufferedReader(new InputStreamReader(System.in));
        this.IP = IP;
        this.port = port;
    }
 
    @Override
    public void run() {
        while (true) {
            // 准备数据
            br = new BufferedReader(new InputStreamReader(System.in));
            String msg;
            try {
                msg = br.readLine();
                byte[] data = msg.getBytes();
                // 封装数据
                DatagramPacket dPacket = new DatagramPacket(data, data.length, InetAddress.getByName(IP), port);
                // 发送数据
                socket.send(dPacket);
                if (msg.equals("exit")) {
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
 
        }
 
        // 关闭资源
        try {
            br.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
    }
 
}

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