Java套接字客户端无法检测到服务器消息 [英] Java socket client doesn't detect server messages

问题描述

我正在尝试在远程主机上运行Java服务器套接字，该主机将定期向所有连接的客户端广播消息（由外部进程确定）。

I am attempting to run a Java server socket on a remote host which will regularly broadcast messages (determined by external processes) to all connected clients.

服务器套接字定义为：

        ServerSocket serverSocket = (ServerSocket) ((ServerSocketFactory)ServerSocketFactory.getDefault()).createServerSocket(3050);

        while (true) {
            Socket socket = serverSocket.accept();
            remoteService.addSocket(socket);
        }

这将在数组列表中跟踪套接字连接。每当需要发送广播时，便会调用以下方法：

Which will keep track of the socket connections in an array list. The method below will then be called whenever a broadcast needs to be sent:

public void broadcastMessage(String message){
    for (Socket socket : remoteService.getSockets()) {
        System.out.println("Sending message: " + message);
        PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
        printWriter.write(message);
    }
}

在客户端，设置如下：

On the client side, the setup is as below:

        Socket socket =  (Socket) ((SocketFactory) SocketFactory.getDefault()).createSocket(serverHost,portNum);

        BufferedReader socketBufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        while (true) {
            String message = socketBufferedReader.readLine();
            if (message != null && message != "") {
                System.out.println("Message received: " + message);
            };
        }

服务器正确打印 Sending message字符串的次数客户端连接，但没有客户端进程打印任何内容。知道如何让客户端正确监听套接字输入流吗？

The server is correctly printing the "Sending message" string as many times as there are clients connected, but none of the client processes print anything. Any idea how to get the clients to properly listen to the socket inputstream?

推荐答案

PrintWrite.println（）方法将打印字符串给定并终止行。在服务器端使用以下代码可以正常工作：

PrintWrite.println() method will print the String it's given and terminate the line. Using the below on the server side worked:

public void broadcastMessage(String message){
    for (Socket socket : remoteService.getSockets()) {
        System.out.println("Sending message: " + message);
        PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
        printWriter.println(message);
    }
}

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