如何在Java 1.4中设置BufferedReader和PrintWriter的超时？ [英] How do you set a timeout on BufferedReader and PrintWriter in Java 1.4?

问题描述

如何在BufferedReader和使用套接字连接创建的PrintWriter上设置超时？这是我现在为服务器提供的代码，直到服务器或客户端崩溃为止：

How does one set a timeout on a BufferedReader and a PrintWriter created using a socket connection? Here is the code I have for the server right now, which works until either the server or the client crashes:

while(isReceiving){
    str = null;
    BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    PrintWriter pw = new PrintWriter(socket.getOutputStream(), true);

    while ((str = br.readLine()) != null){
        System.out.println("Processing command " + str);
        pw.println(client.message(str));
    }
}

在此代码范围之外我强加了一个套接字超时1000毫秒，在等待初始连接时按预期工作。但程序阻塞（str = br.readLine（））。如果客户端挂起或崩溃，它永远不会停止阻止，除非我终止进程（即使这样也不总是有效）。

Outside the scope of this code I have imposed a socket timeout of 1000ms, which works as intended when waiting for the initial connection. But the program blocks at (str = br.readLine()). If the client hangs or crashes, it never stops blocking unless I terminate the process (which even then doesn't always work).

有问题的客户端代码非常相似对此，并以类似的方式阻塞。

The client code in question is very similar to this, and is blocking in a similar fashion.

推荐答案

因为调用socket.close（）似乎没有中断块在br.readLine（），我做了一些解决方法。当断开客户端与服务器的连接时，我只是通过字符串bye发送，并告诉服务器在收到此命令时关闭套接字连接。

Since calling socket.close() did not seem to interrupt the block at br.readLine(), I did a little workaround. When disconnecting the client from the server, I merely send through a string "bye", and told the server to close the socket connection when it receives this command.

while ((str = br.readLine()) != null){
    // If we receive a command of "bye" the RemoteControl is instructing
    // the RemoteReceiver to close the connection.
    if (str.equalsIgnoreCase("bye")){
        socket.close();
            break;
    }
    System.out.println("Processing command " + str);
    pw.println(client.message(str));
}

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