网络编程 udp编程实例

package com.sxc.day;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

/**
 * 发送端
 * 1.DatagramSocket 指定接口 创建发送端
 * 2。准备数据 转成字节数组 
 * 3。封装成DatagramPacket 包裹 指定目的地
 * 4.发送包裹send(DatagramPacket p)
 * 5。释放资源
 */

public class UdpSend {

    public static void main(String[] args) throws IOException {
        System.out.println("发送方启动中");
        DatagramSocket client = new DatagramSocket(8888);
        String data ="上海尚学堂";
        byte[] datas = data.getBytes();
        DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("localhost",9999));
        client.send(packet);
        client.close();

    }
}

package com.sxc.day;


import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

/**
 * 接收端
 * 1.DatagramSocket 指定接口 创建接受端
 * 2。准备容器 封装成DatagramPacket
 * 3.阻塞式接收包裹receive(DatagramPacket p)
 * 4.分析数据
 * 5。释放资源
 */
public class UdpServer {
    public static void main(String[] args) throws IOException {
        System.out.println("接收方启动中");
        DatagramSocket server = new DatagramSocket(9999);
        byte[] container=new byte[1024*60];
        DatagramPacket packet = new DatagramPacket(container, 0, container.length);
        server.receive(packet);
        byte[] datas = packet.getData();
        int len=datas.length;
        String string = new String(datas,0,packet.length);

        System.out.println(string);
        server.close();
    }
}