java - Java套接字客户端未检测到服务器消息

Question

我试图在远程主机上运行Java服务器套接字，该套接字将定期向所有连接的客户端广播消息(由外部进程确定)。

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);
        }

它将在数组列表中跟踪套接字连接。每当需要发送广播时，就会调用以下方法:

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:

        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);
            };
        }

服务器正确地打印了“发送消息”字符串的次数与连接的客户端的次数相同，但是没有一个客户端进程可以打印任何内容。任何想法如何使客户端正确地监听套接字输入流？

Answer 1

PrintWriter.println()方法将打印给定的String并终止该行。在服务器端使用以下代码有效:

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);
    }
}