Java网路编程____UDP协议Socket客户端服务器聊天室列子

1.UPD服务端

定义数据Socket和注册外放的端口

一直做true循环读取数据包Packet里的数据
datagramPacket.getData()转换为String字符串读取

package com.frame.base.UDP;

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

/**
* @author Administrator
* UDP_Sorcket服务端接收UDP_Socket客户端数据
*/
public class UDPSocketServer {

public static void main(String[] args) throws Exception {
/**
* 服务端注册9999端口接收和发送数据由此端口转发
*/
DatagramSocket datagramSocket = new DatagramSocket(9999);
while (true) {
byte[] bytes = new byte[1024];
/**
* 定义数据包对象 获取客户端请求9999端口的数据
*/
DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length);
datagramSocket.receive(datagramPacket);
/**
* 获取的数据为
*/
String receiveData = new String(datagramPacket.getData(), 0, datagramPacket.getLength());
System.out.println(datagramPacket.getAddress().getHostAddress() +"_说:"+ receiveData);
}
}
}


2.UDP_Socket客户端
定义数据Socket和交互的端口

封装数据Packet和服务端ip和接入端口 发送数据字节关闭

package com.frame.base.UDP;

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

public class UDPSocketClient {

public static void main(String[] args) throws Exception {
/**
* 定义客户单发送报文的端口
*/
DatagramSocket datagramSocket = new DatagramSocket(8080);
/**
* 读取控制台信息
*/
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
String lineStr = null;
while ((lineStr = bufferedReader.readLine()) != null) {
byte[] bytes = lineStr.getBytes("UTF-8");
/**
* 封装数据发送到服务端ip和端口
*/
DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length,InetAddress.getByName("127.0.0.1"), 9999);
datagramSocket.send(datagramPacket);
}
datagramSocket.close();
}
}
3.运行
1.启动UDPSocketServer服务端main方法

2.启动UDPSocketClient服务端main方法

3.在客户端控制台发送信息给服务端