java - 客户端-服务器应用程序 JAVA，服务器不接收数据

Question

客户端向服务器发送数据时出现问题。当我从服务器向客户端发送数据时，一切正常。我收到此消息:“客户端接收:消息”但是当我发送“客户端消息”时，我的服务器没有收到它。

import java.io.IOException;

import java.net.*;
import java.io.*;

public class Server {    
    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(4444);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 4444.");
            System.exit(1);
        }

        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(
                                new InputStreamReader(
                                clientSocket.getInputStream()));
        String inputLine, outputLine;

        outputLine = "message";
        out.println(outputLine);

        while ((inputLine = in.readLine()) != null) {
            System.out.println("server receive: " + inputLine);
            outputLine = "second message";
            out.println(outputLine);
        }

        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }
}


public void actionPerformed(ActionEvent e) {

    if (e.getSource() == startButton) {
        this.main.getContentPane().remove(homePanel);
        String name = this.name.getText();

        String result;            
        try {
            connectionToServer();
            if ((result = in.readLine()) != null) {
                System.out.println("client receive: " + result);
                out.println("client's message");
            }
        } catch(IOException err) {
            System.out.println("error");
        }

    }        
}

public void connectionToServer() throws IOException {
    try {
        this.socket = new Socket("localhost", 4444);
        this.in = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
        this.out = new PrintWriter(this.socket.getOutputStream(), true);
    } catch (IOException e) {
        System.err.println("Couldn't get I/O for the connection to: taranis.");
        System.exit(1);
    }        
}

Answer 1

您的 actionPerformed 方法只是链接服务器，什么都不做。

发送消息后服务器关闭。

观察:while ((inputLine = in.readLine()) != null)

如果客户端不发送任何消息，代码将中断，然后您关闭服务器。