[网络协议]基于UDP协议的Socket编程——使用Socket编程实现客户咨询

import java.io.*;
import java.net.*;
import java.util.*;

public class ReceiverAndSender {
?? ?public static void main(String[] args) {
?? ??? ?try {
?? ??? ??? ?// 创建DatagramPacket对象，用来准备接收数据
?? ??? ??? ?DatagramSocket ds = new DatagramSocket(8888);

?? ??? ??? ?System.out.println("接收方已打开！");
?? ??? ??? ?// 接收数据
?? ??? ??? ?byte[] b = new byte[1024];
?? ??? ??? ?DatagramPacket dp = new DatagramPacket(b, b.length);ds.receive(dp);
?? ??? ??? ?// 显示接收到的信息
?? ??? ??? ?String str = new String(dp.getData(), 0,dp.getData().length);
?? ??? ??? ?System.out.println(dp.getAddress().getHostAddress()+"发送的数据为："+str);

?? ??? ??? ?ds.close();

?? ??? ??? ?// 发送回应
?? ??? ??? ?// 获取本地主机地址
?? ??? ??? ?InetAddress ia = InetAddress.getLocalHost();

?? ??? ??? ?Scanner can = new Scanner(System.in);

?? ??? ??? ?// 创建DatagramSocket对象，向接收方发送数据
?? ??? ??? ?DatagramSocket ds2;

?? ??? ??? ?System.out.println("请输入你的回应：");
?? ??? ??? ?String str2 = can.next();
?? ??? ??? ?// 创建DatagramPacket对象，封装数据
?? ??? ??? ?DatagramPacket dp2 = new DatagramPacket(str2.getBytes(), str2.getBytes().length, ia, 8889);
?? ??? ??? ?ds2=new DatagramSocket();
?? ??? ??? ?ds2.send(dp2);

?? ??? ??? ?// 关闭DatagramSocket对象
?? ??? ??? ?ds2.close();
?? ??? ?} catch (SocketException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (IOException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ?}
}

import java.io.*;
import java.net.*;
import java.util.*;

public class SenderAndReceiver {
?? ?public static void main(String[] args) {
?? ??? ?try {
?? ??? ??? ?// 获取本地主机地址
?? ??? ??? ?InetAddress ia = InetAddress.getLocalHost();
?? ??? ??? ?Scanner input = new Scanner(System.in);
?? ??? ??? ?System.out.println("请输入要咨询的问题：");
?? ??? ??? ?String str = input.next();
?? ??? ??? ?// 创建DatagramPacket对象，封装数据
?? ??? ??? ?DatagramPacket dp = new DatagramPacket(str.getBytes(), str.getBytes().length, ia, 8888);
?? ??? ??? ?// 创建DatagramSocket对象，向接收方发送数据
?? ??? ??? ?DatagramSocket ds = new DatagramSocket();
?? ??? ??? ?ds.send(dp);
?? ??? ??? ?// 关闭DatagramSocket对象
?? ??? ??? ?ds.close();
?? ??? ??? ?// 接收数据
?? ??? ??? ?byte[] b = new byte[1024];
?? ??? ??? ?DatagramPacket dp2 = new DatagramPacket(b, b.length);
?? ??? ??? ?// 准备接收回应
?? ??? ??? ?DatagramSocket ds2 = new DatagramSocket(8889);
?? ??? ??? ?ds2.receive(dp2);
?? ??? ??? ?System.out.println("对方已回答：");
?? ??? ??? ?// 显示接收到的信息
?? ??? ??? ?String str2 = new String(dp2.getData(), 0, dp2.getData().length);
?? ??? ??? ?System.out.println(dp2.getAddress().getHostAddress() + "的回答：" + str2);
?? ??? ?} catch (UnknownHostException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (SocketException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?} catch (IOException e) {
?? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ?e.printStackTrace();
?? ??? ?}
?? ?}
}