Question

I want to detect a server-sided socket close (closed by socket.setSoTimeout) by sending data from the client Socket OutputStream (socket.getOutputStream().write(42)). If the Socket is closed on the server-side this should cause an Exception. But it only throws an Exception if I send data twice:

private boolean sendTest() {
    try {
        System.out.print("connection...");
        socket.getOutputStream().write(42); //Sending "*"
        socket.getOutputStream().write(42); //not working without this line
        System.out.println("ok");
        return true;
    } catch (IOException e) {
        System.out.println("error...disconnecting socket");
        disconnect();
        return false;
    }
}

How can you explain this behaviour?

Answer 1

K这里有解释：

您正在将第一个字节发送到服务器。服务器获取它，然后关闭套接字。然后，在THE NEXT WRITE上，由于套接字连接已关闭，因此会收到IOException。

Server side socket close detection

1 个答案: