Java套接字。服务器 - 客户端通信 [英] Java Sockets. Server-Client communication

问题描述

我正在尝试将客户端与gui连接到一个没有gui的服务器。正在进行连接，但我无法看到这两个应用之间的任何消息。
（我应该在客户端获取SERVER，在服务器中使用CLIENT）

I am trying to connect a client with gui with a server withoout gui. Connection is being done, but i cant see any messages between these two apps. (i should get SERVER HERE in client, and CLIENT HERE in server)

客户端连接代码：

@Override
public void ClientRunning(){
    try {
       connectToServer();
        setStreams();
        ClientRun();

    }catch(EOFException oefException){
        showMessage("\n Client terminated the connection\n");
    }catch(IOException ioException){
        ioException.printStackTrace();
    }finally{
        close();
    }
}



public void connectToServer() throws IOException{
    showMessage("Attempting Connection... \n");
    connection = new Socket(InetAddress.getByName(serverIP),6789);
    showMessage("Connected to: "+ connection.getInetAddress().getHostName());
}


public void setStreams() throws IOException{
   output = new PrintWriter(connection.getOutputStream(),true);
   output.flush();
   input= new BufferedReader(new InputStreamReader(connection.getInputStream()));

    showMessage("\n Streams are now set. \n");
}

public void close(){
    showMessage("\n closing...");
    try{
      output.close();
      input.close();
      connection.close();

    }catch(IOException ioException){
        ioException.printStackTrace();
    }
}
public void showMessage(final String text){
    SwingUtilities.invokeLater(new Runnable(){
        public void run(){
            cwindow.append(text);
        }
    });
}

public void sendMessage(String message){
    output.write("CLIENT - "+message);
    output.flush();
    showMessage("\nCLIENT - "+message);
}

private void ClientRun() throws IOException{
    String message="CLIENT HERE!";
    sendMessage(message);
    do{
        try{
            message=input.readLine();
            showMessage("\n"+message);
        }catch(EOFException eofException){
                showMessage("\n Server ended the connection!");
    }

    }while(message!="EXIT");
    }

（输入和输出在GUI类中定义，其中此Client类被扩展to。定义为受保护的BufferedReader输入;
受保护的PrintWriter输出;）

(input and output are defined in GUI class in which this Client class is extended to. Defined as "protected BufferedReader input; protected PrintWriter output;")

此外，服务器代码：

public class ServerClass {


private ServerSocket server;
private Socket connection;
private BufferedReader input;
private BufferedWriter output;


public void startServer(){
    try{
        server=new ServerSocket(6789,100);
        while(true){
            try{
                waitForConnection();
                setStreams();
                ServerRunning();
            }catch(EOFException eofException){
                showMessage("\n Server ended the connection!");

            }finally{
            close();

        }
        }

    }catch(IOException ioException){
        ioException.printStackTrace();
    }
}

private void waitForConnection() throws IOException{
    showMessage("Waiting for someone to connect... \n");
    connection=server.accept();
    showMessage("Now connected to "+ connection.getInetAddress().getHostName());
}

private void setStreams() throws IOException{
   output = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
   output.flush();
   input= new BufferedReader(new InputStreamReader(connection.getInputStream()));

    showMessage("\n Streams are now set. \n");
}
public void ServerRunning() throws IOException{
    String message="SERVER HERE!";
    sendMessage(message);
    do{
        try{

            message=input.readLine();
            showMessage("\n"+message);
        }catch(EOFException eofException){
                showMessage("\n Server ended the connection!");
    }

    }while(message!="EXIT");

  }
private void close(){
    showMessage("\n Closing connections... \n");
    try{
        output.close();
        input.close();
        connection.close();

}catch(IOException ioException){
    ioException.printStackTrace();
}
}
private void showMessage(String text){
    System.out.println(text);
}

private void sendMessage(String message){
    try{
       output.write("SERVER - "+message);
        output.flush();
        showMessage(message);
    }catch(IOException ioException){
        System.out.println("\n ERROR!");
    }
}

连接似乎没问题，所以我不知道搞错了。任何帮助将不胜感激。

Connection seems to be ok, so i don't get whats wrong. Any help would be appreciated.

PS：我也在服务器中尝试过PrintWriter，并尝试在流语句中尝试catch，问题仍然存在。

PS: i also tried PrintWriter in server as well and also tried a try catch in stream statement, the problem remains.

推荐答案

您正在使用 readLine（），它需要换行符。将 \ n 添加到您要发送的邮件中，或者不使用 readLine（）。

You're using readLine() which expects a newline character. either add a \n to the messages you are sending or don't use readLine().

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