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);
    }
}