java - 通过套接字发送字符串。服务器没有收到

Question

我最近一直在努力寻找一种通过套接字文件传递字符串的方法。我计划创建一个远程工具(客户端)来根据收到的消息(服务器)执行操作。我在谷歌上搜索了我的问题的答案，我发现了一些东西并设法理解了一些东西，但我也遇到了一些问题(我是编程新手，还没有上大学)。

如果您能在此事上得到任何帮助，我将不胜感激

SocketService.java ---- 类文件=服务器端

 package socket;

import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.concurrent.TimeUnit;

public class ServiceSocket {
    static ServerSocket myService;
    static Socket thesocket;
    static Thread socketThread;
    public static boolean socketRunning;
     public static DataInputStream socketMessage;


    public static void initialise(String localhost, int portNumber ){
        // make a server socket//////
        try {
            myService = new ServerSocket(portNumber);
            System.out.println();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //////////////////////////////

    }

    public static void deploySocket(){
        socketThread = new Thread() {
            public void run(){

                // making connection
                System.out.println("VVaiting for connection...");
                try {
                    thesocket = myService.accept();
                    System.out.println("Connection made");
                    socketRunning = true;
                } catch (IOException e) {
                    e.printStackTrace();
                }
                ////////////////////////////////////
                try {
                    StartBrain();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }

                if(socketRunning = false) {
                try {
                    thesocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
      }

    };
        socketThread.start();
  }

     public static String getSocketMessage() throws IOException {

         try {
            socketMessage = new DataInputStream(thesocket.getInputStream());
        } catch (IOException e1) {
            e1.printStackTrace();
        }
         boolean looprunning = true;
         String message = null;
         System.out.println("entering loop");
               do {
                   try {
                   while (socketMessage.readUTF() != null) {

                message = socketMessage.readUTF();
                looprunning = false;
                      }
                   } catch (EOFException e) {

                   }
               }while(looprunning);

                System.out.println("Message received from UTF: " + message);
                System.out.println("loop exited vvith message");   

         if(message == null) {
          message = "no message";
         }

         return message;
     }

     public static void StartBrain() throws IOException {
         System.out.println("socket brain started");
        String BrainMessage = getSocketMessage();
             if(BrainMessage == "command") {
                 System.out.println("Command EXECUTED HAHA");
             } else if(BrainMessage == "taskschedule") {
                 System.out.println("task scheduled");
             } else {
                 System.out.println("no command received");
             }

         }

Main.java ----- 类文件 = 服务器端 包主；

import socket.ServiceSocket;

public class Main {

   public static void main(String[] args) {

      ServiceSocket.initialise("localhost", 3535);
      ServiceSocket.deploySocket();
    }
   }  
} 

Main.java = 客户端

package mainPackage;

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

public class Main {
    private static Socket clientSocket;

    public static void sendMessage(String message) throws IOException, InterruptedException {
        DataOutputStream dOut = new DataOutputStream(Main.clientSocket.getOutputStream());

        dOut.writeUTF(message);
        dOut.flush(); 

        dOut.close();
            }

    public static void main(String[] args) throws Exception {
     //   String modifiedSentence;

        clientSocket = new Socket("localhost", 3535);
        System.out.println("Initializing");
        sendMessage("command");

        boolean running = true;
     while(running) {
         TimeUnit.SECONDS.sleep(3);
         sendMessage("taskschedule");
     }
     clientSocket.close();

    }
}

主要问题

 do {
                   try {
                   while (socketMessage.readUTF() != null) {

                message = socketMessage.readUTF();
                looprunning = false;
                      }
                   } catch (EOFException e) {

                   }
               }while(looprunning);

它不读取字符串/UTF

Answer 1

它确实读取了它，在这里:

while (socketMessage.readUTF() != null) {

然后将其丢弃，因为您没有将返回值分配给变量，然后尝试读取另一个变量，如下所示:

message = socketMessage.readUTF();

但是您发送的一条(第一条)消息已经消失了。