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HttpClient

同步 & 异步

  • HttpAsyncClients 利用 NIO 实现异步非阻塞 IO
  • HttpClients 利用 BIO 实现同步阻塞 IO

连接池

  • PoolingHttpClientConnectionManager BIO
  • PoolingNHttpClientConnectionManager NIO

每个 host 建立连接后 keep alive，之后所有该 host 的请求使用同一个连接

多线程

参考 Chapter 2. Connection management 2.4. Multithreaded request execution

需要在建立请求时使用多线程

上传文件

BIO

  • MultipartEntity

NIO

MultipartEntity is inherently blocking. It can only generate its content
by writing it out to an OutputStream through #writeTo() method. It does
not support #getContent() method, which makes it impossible to use with
a non-blocking I/O model without buffering.

You can wrap the MultipartEntity instance with BufferedHttpEntity in
order to make it compatible with the HttpAsyncClient's non-blocking I/O
model.
  • EntityAsyncContentProducer
  • BufferedHttpEntity

References

References