惠州​Java网络中的Echo客户端是什么？_北大青鸟IT学校

Java网络中的Echo客户端是什么？这是大家在学习Java的过程都会遇到的问题，那么下面我们一起来看看惠州北大青鸟学术部老师是怎么讲解这道题的。

基于UDP套接字的Echo客户端

import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.UnknownHostException;public class Main {  public static void main(String[] args) throws Exception {
   DatagramSocket udpSocket = new DatagramSocket();
   String msg = null;
   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   System.out.print("Please enter a  message  (Bye  to quit):");    while ((msg = br.readLine()) != null) {      if (msg.equalsIgnoreCase("bye")) {        break;
     }
     DatagramPacket packet = Main.getPacket(msg);
     udpSocket.send(packet);
     udpSocket.receive(packet);
     displayPacketDetails(packet);
     System.out.print("Please enter a  message  (Bye  to quit):");
   }
   udpSocket.close();
 }  public static void displayPacketDetails(DatagramPacket packet) {    byte[] msgBuffer = packet.getData();    int length = packet.getLength();    int offset = packet.getOffset();    int remotePort = packet.getPort();
   InetAddress remoteAddr = packet.getAddress();
   String msg = new String(msgBuffer, offset, length);
   System.out.println("[Server at IP  Address=" + remoteAddr + ", port="
       + remotePort + "]: " + msg);
 }  public static DatagramPacket getPacket(String msg)      throws UnknownHostException {    int PACKET_MAX_LENGTH = 1024;    byte[] msgBuffer = msg.getBytes();    int length = msgBuffer.length;    if (length > PACKET_MAX_LENGTH) {
     length = PACKET_MAX_LENGTH;
   }
   DatagramPacket packet = new DatagramPacket(msgBuffer, length);
   InetAddress serverIPAddress = InetAddress.getByName("localhost");
   packet.setAddress(serverIPAddress);
   packet.setPort(15900);    return packet;
 }
}

上面的代码生成以下结果。

Please enter a message (Bye to quit):Byte

Java

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