黑马JAVA P181 UDP快速入门、多发多收消息、广播、组播了解

package com.itheima;

import javax.xml.crypto.Data;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

public class ClientDemo1 {
    public static void main(String[] args) throws Exception {
        System.out.println("=========客户端启动=========");

        //1.创建发送端对象：发送端自带默认的端口号（人）
        DatagramSocket socket = new DatagramSocket();

        //2.创建一个数据包对象封装数据（韭菜盒子）
        
        byte[] buffer = "我是一颗快乐的韭菜，你愿意吃吗？".getBytes();
        DatagramPacket packet = new DatagramPacket(buffer,buffer.length,
                InetAddress.getLocalHost(), 8888);

        //3.发送数据出去
        socket.send(packet);

        socket.close();
    }
}

package com.itheima;

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


public class ServerDemo2 {
    public static void main(String[] args) throws Exception {
        System.out.println("=========服务端启动=========");
        //1.创建接收端对象：注册端口（人）
        DatagramSocket socket = new DatagramSocket(8888);

        //2.创建一个数据包对象接收数据（韭菜盒子）
        byte [] buffer = new byte[1024 * 64];
        DatagramPacket packet = new DatagramPacket(buffer,buffer.length);

        //3.等待接收数据即可
        socket.receive(packet);

        //4.取出数据即可
        //读取多少倒出多少
        int len = packet.getLength();
        String rs = new String(buffer,0,len);
        System.out.println("收到了：" + rs);

        //获取发送端的ip和端口
        String ip = packet.getSocketAddress().toString();
        System.out.println("对方地址：" + ip);

        int port = packet.getPort();
        System.out.println("对方端口:" + port);

        socket.close();
    }
}

package com.itheima.d4_udp3_broadcast;

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


public class ServerDemo2 {
    public static void main(String[] args) throws Exception {
        System.out.println("=========服务端启动=========");
        //1.创建接收端对象：注册端口（人）
        DatagramSocket socket = new DatagramSocket(9999);

        //2.创建一个数据包对象接收数据（韭菜盒子）
        byte [] buffer = new byte[1024 * 64];
        DatagramPacket packet = new DatagramPacket(buffer,buffer.length);

        while (true) {
            //3.等待接收数据即可
            socket.receive(packet);

            //4.取出数据即可
            //读取多少倒出多少
            int len = packet.getLength();
            String rs = new String(buffer,0,len);
            System.out.println("收到了来自：" + packet.getAddress() + ", 对方端口是" + packet.getPort() + "的消息：" + rs);

        }
    }
}

package com.itheima.d4_udp3_broadcast;

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


public class ClientDemo1 {
    public static void main(String[] args) throws Exception {
        System.out.println("=========客户端启动=========");

        //1.创建发送端对象：发送端自带默认的端口号（人）
        DatagramSocket socket = new DatagramSocket(7777);

        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请说：");
            String msg = sc.nextLine();

            if("exit".equals(msg)){
                System.out.println("离线成功！");
                socket.close();
                break;
            }

            //2.创建一个数据包对象封装数据（韭菜盒子）
            byte[] buffer = msg.getBytes();
            DatagramPacket packet = new DatagramPacket(buffer,buffer.length,
                    InetAddress.getByName("255.255.255.255"),
                    9999);

            //3.发送数据出去
            socket.send(packet);
        }

    }
}

package com.itheima.udp4_multicast;

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


public class ServerDemo2 {
    public static void main(String[] args) throws Exception {
        System.out.println("=========服务端启动=========");
        //1.创建接收端对象：注册端口（人）
        MulticastSocket socket = new MulticastSocket(9999);

        //把当前接收端加入到一个组播组中去：绑定对应的组播消息的组播IP
        socket.joinGroup(InetAddress.getByName("224.0.0.1"));

        //2.创建一个数据包对象接收数据（韭菜盒子）
        byte [] buffer = new byte[1024 * 64];
        DatagramPacket packet = new DatagramPacket(buffer,buffer.length);

        while (true) {
            //3.等待接收数据即可
            socket.receive(packet);

            //4.取出数据即可
            //读取多少倒出多少
            int len = packet.getLength();
            String rs = new String(buffer,0,len);
            System.out.println("收到了来自：" + packet.getAddress() + ", 对方端口是" + packet.getPort() + "的消息：" + rs);

        }
    }
}

package com.itheima.udp4_multicast;

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


public class ClientDemo1 {
    public static void main(String[] args) throws Exception {
        System.out.println("=========客户端启动=========");

        //1.创建发送端对象：发送端自带默认的端口号（人）
        DatagramSocket socket = new DatagramSocket(7777);

        Scanner sc = new Scanner(System.in);
        while (true) {
            System.out.println("请说：");
            String msg = sc.nextLine();

            if("exit".equals(msg)){
                System.out.println("离线成功！");
                socket.close();
                break;
            }

            //2.创建一个数据包对象封装数据（韭菜盒子）
            byte[] buffer = msg.getBytes();
            DatagramPacket packet = new DatagramPacket(buffer,buffer.length,
                    InetAddress.getByName("224.0.0.1"),
                    9999);

            //3.发送数据出去
            socket.send(packet);
        }

    }
}