网络 - Java 异步http请求。

Question

发送http 请求（request）后，需要等待一段时间，比如30秒后才能得到响应（response）。采用java，如何高效的实现在一定时间内，发送http请求后，得到尽可能多的响应。
我尝试过线程池，但是我有大约十多种不同类型的http请求，线程池数量一多比较消耗资源。我也试过Apache的HttpAsyncioRequest，但是其内部实现就是线程池，在我的这个问题上实现效率也不高。有没有比较好的库或者方法，或者类似python coroutine那样，可以高效的实现并发请求。

Answer 1

Reference NIO selector

Let’s consider it a bit original:

1. No matter how concurrent or asynchronous you are, a TCP connection must be established before an http request is sent out. After it is sent out, the client must have a thread in a listening state waiting for the server's return.

2. The client sends http requests non-blockingly. After each thread request is sent out, a new thread is created to listen for http returns, and the original thread does other work.

This solution will consume double N threads and N TCP connections.

Some considerations for optimization: instead of consuming a thread for monitoring each connection, one thread can monitor the corresponding -> selector of all connections.

Answer 2

You can release the connection and resources after sending the request, and let the other party call back your interface after processing