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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