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我正在测试 java AsynchronousServerSocketChannel，但是当我尝试设置 SO_KEEPALIVE=true 时，一条错误消息显示我不支持它？如何解决以下问题？ubunut服务器真的不支持keep-alive吗？

代码是：

private void init(String host, int port) {
    try {
        final AsynchronousChannelGroup group = AsynchronousChannelGroup.withCachedThreadPool(Executors.newCachedThreadPool(), 10);
        final AsynchronousServerSocketChannel server = AsynchronousServerSocketChannel
                .open(group).bind(new InetSocketAddress(host, port))
                .setOption(StandardSocketOptions.SO_KEEPALIVE, true)
                .setOption(StandardSocketOptions.TCP_NODELAY, true)
                .setOption(StandardSocketOptions.SO_REUSEADDR, true)
                .setOption(StandardSocketOptions.SO_RCVBUF, 16 * 1024);
        System.out.println("Listening on: " + host + ":" + port);
        System.out.println("Channel Provider : " + server.provider());
        server.accept(null, new handler());
        group.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
        //TimeUnit.DAYS.sleep(Long.MAX_VALUE);
    } catch (IOException | InterruptedException ex) {
        Logger.getLogger(AIOEchoServer.class.getName()).log(Level.SEVERE, null, ex);
    }
}

private class handler implements CompletionHandler<AsynchronousSocketChannel, Void> {

    @Override
    public void completed(AsynchronousSocketChannel result, Void attachment) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public void failed(Throwable ex, Void attachment) {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}

错误是：

Exception in thread "main" java.lang.UnsupportedOperationException: 'SO_KEEPALIVE' not supported
at sun.nio.ch.AsynchronousServerSocketChannelImpl.setOption(AsynchronousServerSocketChannelImpl.java:187)
at TestAIO.AIOEchoServer.init(AIOEchoServer.java:28)
at TestAIO.AIOEchoServer.main(AIOEchoServer.java:20)
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1 回答 1

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您正在使用异步服务器SocketChannel，即只能接受新传入连接而不能交换数据的侦听套接字。socket 选项根本不适用于侦听套接字。

类文档说明了很多。

您应该在从中获得的新套接字上设置这些选项accept()

于 2016-06-25T12:50:21.040 回答