Question

I am trying to set a timeout when a client try to connect to a server, if the server is down, the connection will wait 10 sec befor throwing the timeout exception. In my case the code bellow throw the IOException without waiting, I really don t get it !

public boolean establishConnection()
{
    System.out.println ("Connecting to " +
            this.getServerHostname() + " au port " + this.getServerPort()+ " ...");

    try {

        SocketAddress sockaddr= new InetSocketAddress(_serverHostname, _serverPort);
        _echoSocket = new Socket();
        _echoSocket.connect(sockaddr,10000);
        return _echoSocket.isConnected();


    } catch (UnknownHostException e) {
        System.err.println("Unknown Host: " + this.getServerHostname());
        return false;
    } catch (SocketTimeoutException e) {
        System.err.println("Timeout");
        return false;
    } catch (IOException e) {
        System.err.println("IOException  : " + 
                this.getServerHostname() + ":" + this.getServerPort());
        return false;
    }
}

Answer 1

只有当您的连接请求没有得到响应时，您才会得到超时。如果服务器立即拒绝它，或者如果服务器不存在，您将立即得到一个异常。

Answer 2

But is this what you want to achieve?
If your intention is, in case the server is temporarily down, then try again after 10 sec then your approach is wrong.
You should try to do a connection to the server and if you get an exception because the server is down, you can sleep for 10 seconds and try the request again.
Otherwise Ernest s answer is correct

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