客户端无法发送消息到服务器Java套接字

我正在尝试使用客户端和服务器进行简单项目，客户端发送字符串，服务器将其反向发送回客户端。然而，他们都在挂断收发信息。所以非常想告诉你我在我的程序中停止的地方......这里是我的客户端和服务器的控制台输出。客户端无法发送消息到服务器Java套接字

客户

Connecting to server... 
S: Connected to server at 4446 
You sent Oranges, sending message...

服务器

Waiting for a connection... 
Connection received from /127.0.0.1 on port 4446 
Waiting for response...

我读过一些关于怎么样，你需要使用的确切消息输出和输入。所以就像客户端用一个新行发送一个输入一样，服务器应该可以读取它。尽管我在代码中没有看到，但是我的预感是这个问题。

我的代码如下......

Client.java

import java.io.IOException; 
import java.io.PrintWriter; 
import java.net.Socket; 
import java.net.UnknownHostException; 
import java.util.Scanner; 

public class Client 
{ 
    PrintWriter out; 
    Scanner conIn; 

    public static void main(String[] args) throws UnknownHostException, IOException 
    { 
     Client c = new Client(); 
     c.run(); 
    } 

    public void run() throws UnknownHostException, IOException 
    { 
     System.out.println("Connecting to server..."); 
     Socket connection = new Socket("localhost", 4446); //Connects to server 
     out = new PrintWriter(connection.getOutputStream()); 
     conIn = new Scanner(connection.getInputStream()); 
     String msg = conIn.nextLine(); 
     System.out.println(msg); 
     String s = "Oranges"; 
     System.out.println("You sent " + s + ", sending message..."); 
     out.println(s); //STOPS HERE 
     msg = conIn.nextLine(); 
     System.out.println(msg); 
     out.flush(); 
    } 
}

Server.java

import java.io.IOException; 
import java.io.PrintWriter; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.util.Scanner; 

public class Server implements Runnable 
{ 
    ServerSocket serverSocket; 
    Scanner in; 
    PrintWriter out; 
    Socket connection = null; 

    public static void main(String[] args) 
    { 
     Server s = new Server(); 
     s.run(); 
    } 

    public void run() 
    { 
     try 
     { 
      serverSocket = new ServerSocket(4446); //Create server 
      System.out.println("Waiting for a connection..."); 
      this.connection = serverSocket.accept(); //Accept connection 
      System.out.println("Connection recieved from " + connection.getInetAddress() + " on port " + connection.getLocalPort()); 
      out = new PrintWriter(connection.getOutputStream()); //Gets output to connection 
      out.flush(); 
      in = new Scanner(connection.getInputStream()); //Gets input to connection 
      out.println("S: Connected to server at " + serverSocket.getLocalPort()); 
      out.flush(); 
      System.out.println("Waiting for response..."); 
      String msg = in.nextLine(); //STOPS HERE 
      System.out.println("Message recieved! Reversing now."); 
      String rMsg = reverse(msg); 
      System.out.println("Returning message..."); 
      out.println("S: Your message was: " + msg + " and it is now " + rMsg); 
      out.flush(); 
     } 
     catch (IOException e) 
     { 
      e.printStackTrace(); 
     } 
    } 

    public String reverse(String s) 
    { 
     String revS = ""; 

     for(int i = s.length() - 1; i >= 0; i--) 
     { 
      revS = revS + s.charAt(i); 
     } 
     return revS; 
    } 

}

来源

2017-02-05 Carson

后，如果您做些什么'出来.flush（）;'out.println（s）;'后立即'' –

啊，似乎已经奏效，谢谢！我以为他们每次都想堆栈或者什么东西，并且在发送一堆输出之后就可以做到。但我想这并没有多大意义。谢谢 – Carson

当你在等待数据的交叉传输时，你不能“堆叠”。使用线程同时允许输出和输入会更好。 –

将out.flush();的out.println(s);

来源

2017-02-11 17:19:46 Carson

客户端无法发送消息到服务器Java套接字

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