java网络编程实战

package com.kuang.chat;

import java.io.*;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TaskReceiver implements Runnable{
    DatagramSocket socket = null;
    DatagramPacket packet = null;
    int port;
    String name;
    public TaskReceiver(int port,String name) throws SocketException {
        this.name = name;
        this.port =port;
        socket = new DatagramSocket(port);
    }
    @Override
    public void run() {
            while(true){
                byte[] buffer = new byte[1024];
                packet = new DatagramPacket(buffer,0 ,buffer.length);
                try {
                    socket.receive(packet);
//                    ByteArrayInputStream bas = new ByteArrayInputStream(packet.getData());
//                    ByteArrayOutputStream bos = new ByteArrayOutputStream();
//                    int len;
//                    while((len=bas.read(buffer))!=-1){
//                        bos.write(buffer,0,len);
//                    }

//                    String msg = bos.toString();
                    String msg  = new String(packet.getData(),0,packet.getLength());
                    System.out.println(name+":"+msg);
                    if (msg.equals("bye")){
                        break;
                    }
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            socket.close();
    }
}

package com.kuang.chat;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.*;
import java.nio.file.StandardCopyOption;

public class TaskSender implements  Runnable{
    DatagramSocket socket = null;
    DatagramPacket packet = null;
    String toIp = null;
    int toPort;
    int fromPort;
    BufferedReader bf;

    public TaskSender(String toIp, int toPort, int fromPort) throws SocketException {
        this.toIp = toIp;
        this.toPort = toPort;
        this.fromPort = fromPort;
        socket = new DatagramSocket();
        bf = new BufferedReader(new InputStreamReader(System.in));
    }

    @Override
    public void run() {
        while (true){
            try {
                String msg = bf.readLine();
                packet = new DatagramPacket(msg.getBytes(),0,msg.getBytes().length, InetAddress.getByName(toIp),toPort);
                socket.send(packet);
                if(msg.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        socket.close();

    }
}

package com.kuang.chat;

import java.net.SocketException;

public class StudentDemo {
    public static void main(String[] args) throws SocketException {
        new Thread(new TaskSender("localhost", 9999, 1111)).start();
        new Thread(new TaskReceiver(8888,"老師")).start();
    }
}

package com.kuang.chat;

public class TeacherDemo {
    public static void main(String[] args)throws  Exception {
        new Thread(new TaskSender("localhost", 8888, 1111)).start();
        new Thread(new TaskReceiver(9999,"學生")).start();
    }
}

package com.kuang.chat;

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UdpReceiver {
    public static void main(String[] args)throws  Exception {
        DatagramSocket socket =new DatagramSocket(6666);
        byte[] buffer = new byte[1024];
        DatagramPacket datagramPacket =new DatagramPacket(buffer,0,buffer.length);
        socket.receive(datagramPacket);
        System.out.println(new String(datagramPacket.getData(),0,datagramPacket.getLength()));
        socket.close();
    }
}

package com.kuang.chat;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UdpSender {
    public static void main(String[] args)throws  Exception {
        DatagramSocket datagramSocket = new DatagramSocket();
        byte[] buffer = new byte[1024];
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String msg = bf.readLine();
        DatagramPacket datagramPacket = new DatagramPacket(msg.getBytes(),0,msg.length(), InetAddress.getLocalHost(),6666);
        datagramSocket.send(datagramPacket);
    }

}

package com.kuang.lesson04;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class UdpServerDemo {
    public static void main(String[] args) throws  Exception{
        DatagramSocket socket = new DatagramSocket(9090);
        byte[] buffer = new byte[1024];
        DatagramPacket packet = new DatagramPacket(buffer, 0, buffer.length);
        socket.receive(packet);
        System.out.println(packet.getAddress());
        System.out.println(new String(packet.getData(),0,packet.getLength()));
        socket.close();
    }
}

package com.kuang.lesson04;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UdpClientDemo {
    public static void main(String[] args)throws  Exception {
        InetAddress localhost = InetAddress.getLocalHost();
        int port = 9090;
        DatagramSocket socket = new DatagramSocket();
        String msg = "你好";

        DatagramPacket packet = new DatagramPacket(msg.getBytes(),0,msg.getBytes().length,localhost,port);
        socket.send(packet);
        socket.close();
    }
}