网络编程应用：基于UDP协议【实现聊天程序】--练习

要求：

使用UDP协议实现一个聊天程序

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代码：

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发送端：

package UDP聊天程序;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Scanner;

public class Send {
    public static void main(String[] args) {
        System.out.println("发送端已启动！");

        DatagramSocket socket=null;
        Scanner scanner=new Scanner(System.in);
        try {
            //1.创建Datagramsocket对象
            socket=new DatagramSocket();

            while(true){
                //2.要发送的数据
                String string=scanner.nextLine();

                //3.创建数据包
                DatagramPacket packet=new DatagramPacket(string.getBytes(), string.getBytes().length,InetAddress.getLocalHost(),6666);
                //4.发送数据
                socket.send(packet);
                //若我方发送了bye，马上结束聊天
                if(string.equals("bye")){
                    System.out.println("bye,聊天结束！");
                    break;
                }

                //5.接收--接收端回复的数据
                byte[] bs=new byte[1024];
                DatagramPacket packet2=new DatagramPacket(bs, bs.length);
                socket.receive(packet2);
                String string2=new String(packet2.getData(), 0, packet2.getLength());
                //若对方发送了bye，马上结束聊天
                if(string2.equals("bye")){
                    System.out.println("bye,聊天结束！");
                    break;
                }
                System.out.println("接收端回复："+string2);
            }


        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            if(socket!=null){
                socket.close();
            }
        }

    }
}

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接收端：

package UDP聊天程序;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.util.Scanner;

public class Receive {
    public static void main(String[] args) {
        System.out.println("接收端已启动！");

        DatagramSocket socket=null;
        Scanner scanner=new Scanner(System.in);
        try {
            //1.创建Datagrams对象
            socket=new DatagramSocket(6666);

            while(true){
                //2.创建数据包packet
                byte[] buf=new byte[1024];
                DatagramPacket packet=new DatagramPacket(buf, buf.length);
                //3.接收数据
                socket.receive(packet);
                String string=new String(packet.getData(), 0, packet.getLength());
                //若对方发送了bye，马上结束聊天
                if(string.equals("bye")){
                    System.out.println("bye,聊天结束！");
                    break;
                }
                System.out.println("发送端说："+string);

                //4.给发送端回复
                String string2=scanner.nextLine();
                DatagramPacket packet2=new DatagramPacket(string2.getBytes(), string2.getBytes().length,packet.getAddress(),packet.getPort());
                socket.send(packet2);
                //若我方发送了bye，马上结束聊天
                if(string2.equals("bye")){
                    System.out.println("bye,聊天结束！");
                    break;
                }
            }
        } catch (SocketException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            if(socket!=null){
                socket.close();
            }
        }

    }
}

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运行结果：

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接收端聊天列表：

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发送端聊天列表：