java - 使用 PrintWriter 通过 Java 套接字发送数据不起作用

Question

我目前正在学习在Java中使用套接字，但无法设法在套接字之间发送数据，在本例中是在android和计算机之间(如果相关的话)。我使用的方法来自here .

请原谅不良的代码格式。

客户端:

PrintWriter out = null;
    try {
        Socket socket = new Socket("IP_OF_SERVER", 8000);

        out = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        while ((fromServer = in.readLine()) != null) {
            response = fromServer;
            System.out.println("Client: " + fromUser);
            out.println(fromUser);
        }

        socket.close();

    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally{
        out.close();
    }
...
textResponse.setText(response);

服务器端:

Socket hostThreadSocket = serverSocket.accept();
...

        PrintWriter out = null;
        String response,inputLine,outputLine;
        try {
            out = new PrintWriter(hostThreadSocket.getOutputStream(), true);
            BufferedReader in = new BufferedReader(new InputStreamReader(hostThreadSocket.getInputStream()));

            while ((inputLine = in.readLine()) != null) {
                System.out.println(inputLine);
                outputLine = "Hello";
                out.println(outputLine);
            }


        } catch (IOException ex) {
            Logger.getLogger(host.class.getName()).log(Level.SEVERE, null, ex);
            System.out.println("IOException");
        }finally{
            try {
                System.out.println("closing socket");
                out.close();
                hostThreadSocket.close();
            } catch (IOException ex) {
                System.out.println("Other IOException");
               Logger.getLogger(host.class.getName()).log(Level.SEVERE, null, ex);
            }
        }

什么有效:

• 在这两个 Java 文件中都没有发现错误(据我所知)

• 连接已建立

什么不:

• 两端均未看到任何消息

我尝试包含尽可能少的代码，如果需要更多代码，我将编辑问题。任何有关修复或调试此问题的帮助将不胜感激。

Answer 1

您的客户端和服务器都在等待对方开始通信。