UdpEchoClient客户端实现 java

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

public class UdpEchoClient {
    private DatagramSocket socket = null;
    private String serverIp;
    private int serverPort;
     public UdpEchoClient(String serverIp,int serverPort) throws SocketException {
         this.serverIp = serverIp;
         this.serverPort = serverPort;
         socket = new DatagramSocket();
     }

    public void start() throws IOException {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("->");
            String request = scanner.nextLine();
            if(request.equals("exit")){
                break;
            }
            //发送请求
            DatagramPacket requestpacket = new DatagramPacket(request.getBytes(),request.getBytes().length,
                    InetAddress.getByName(serverIp),serverPort);
            socket.send(requestpacket);
            //收到回应
            DatagramPacket responsepacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(responsepacket);
            String response = new String(requestpacket.getData(),0,responsepacket.getLength()).trim();
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient client = new UdpEchoClient("127.0.0.1",9090);
        client.start();
    }
}