【Java】网络编程-UDP字典服务器客户端简单代码编写

上文讲了UDP回响服务器客户端简单代码编写

本文将讲述UDP字典服务器客户端简单代码编写。所谓回显，就是指客户端向服务器发送一个报文，从服务器那里得到一条一模一样的回响报文

而我们的字典功能呢，则是实现了输入中文，得到对应的英文

1、代码讲解

要实现这个功能，我们只需要对process()方法进行修改，即对处理request，返回response这个功能进行修改

要实现字典功能，我们在构造方法里定义一个Map数据结构，在Map中放入要翻译的词汇

public UdpDictServer(int port) throws SocketException {socket = new DatagramSocket(port);map.put("小狗","dog");map.put("小猫","cat");map.put("猪猪","pig");
}

然后对process()方法进行修改

public static String process(String key){return map.get(key);
}

其余代码与回响程序相同

2、完整代码

服务器端完整代码

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.util.HashMap;
import java.util.Map;public class UdpDictServer {public static DatagramSocket socket = null;static Map<String,String> map = new HashMap<>();public UdpDictServer(int port) throws SocketException {socket = new DatagramSocket(port);map.put("小狗","dog");map.put("小猫","cat");map.put("猪猪","pig");}public static void start() throws IOException {System.out.println("服务器开始！");while (true){DatagramPacket requestPacket = new DatagramPacket(new byte[1024],1024);socket.receive(requestPacket);String request = new String(requestPacket.getData(),0,requestPacket.getLength());String response = process(request);DatagramPacket responsePacket = new DatagramPacket(response.getBytes(),response.getBytes().length, requestPacket.getSocketAddress());socket.send(responsePacket);System.out.printf("[%s:%d] rec:%s,resp:%s",requestPacket.getAddress().toString(),requestPacket.getPort(),request,response);}}public static String process(String key){return map.get(key);}public static void main(String[] args) throws IOException {UdpDictServer server = new UdpDictServer(9090);server.start();}
}

客户端完整代码

import UDPecho.UdpEchoClient;import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.Scanner;public class UdpDictClient {public static DatagramSocket socket = null;private static String ip = null;private static int port = 0;public UdpDictClient(String ip,int port) throws SocketException {socket = new DatagramSocket();this.ip = ip;this.port = port;}public static void start() throws IOException {System.out.println("客户端开始");Scanner scanner = new Scanner(System.in);while (true){System.out.print("->");String request = scanner.next();DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),request.getBytes().length, InetAddress.getByName(ip),port);socket.send(requestPacket);DatagramPacket responsePacket = new DatagramPacket(new byte[1024],1024);socket.receive(responsePacket);String response = new String(responsePacket.getData(),0,responsePacket.getLength());System.out.println(response);}}public static void main(String[] args) throws IOException {UdpDictClient client = new UdpDictClient("127.0.0.1",9090);client.start();}
}

实现结果