dgramssocket

java课件及例程有一些PPT及一些例程

import java.net.*;
import java.io.*;
public class DgramSSocket{
    public static void main(String args[]){
        DatagramSocket ds = null;
        DatagramPacket dp = null;
        String data = "";
        try{
            //创建一个数据报套接字，绑定到5000端口上
            ds = new DatagramSocket(5000);
            //接收键盘输入的数据组成数据报
            System.out.println("请输入欲发送的字符串：");
            BufferedReader is = new BufferedReader(new InputStreamReader(System.in));
            data = is.readLine();
            byte[] b = data.getBytes();
            InetAddress a = InetAddress.getByName("127.0.0.1");
            dp = new DatagramPacket(b,b.length,a,4000);
            //发送数据报
            System.out.println("发送数据："+data);
            ds.send(dp);
            //创建接收数据报对象并接收传来的数据
            byte[] recv = new byte[256];
            dp.setData(recv, 0,recv.length);
            ds.receive(dp);
            System.out.println("从服务器端接收到："+new String(dp.getData()));
            ds.close();
        }catch(Exception e){
            System.out.println (e.toString ());
        }
        
    }
}