java keepalive,如何通过httpclient在Java中设置TCP Keep Alive

在Java中使用HttpClient设置TCP Keep Alive可以通过以下代码实现：

HttpClient client = HttpClientBuilder.create().build();
HttpHost target = new HttpHost("example.com", 80, "http");
HttpRequest request = new HttpGet("/");
SocketConfig socketConfig = SocketConfig.custom()
    .setSoKeepAlive(true)
    .setTcpNoDelay(true)
    .setSoTimeout(5000)
    .build();
ConnectionKeepAliveStrategy keepAliveStrategy = new DefaultConnectionKeepAliveStrategy() {
    @Override
    public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
        long keepAlive = super.getKeepAliveDuration(response, context);
        if (keepAlive == -1) {
            keepAlive = 5000;
        }
        return keepAlive;
    }
};
CloseableHttpClient client = HttpClients.custom()
    .setDefaultSocketConfig(socketConfig)
    .setKeepAliveStrategy(keepAliveStrategy)
    .build();

在这个示例中，我们使用SocketConfig设置了SO_KEEPALIVE选项，这将启用TCP Keep Alive。我们还使用ConnectionKeepAliveStrategy设置了默认的保持活动策略。在这个示例中，我们使用DefaultConnectionKeepAliveStrategy，并覆盖了getKeepAliveDuration方法来设置保持活动的时间。在这个示例中，我们设置保持活动时间为5秒钟。