说明：  例子以拍拍网为例下载网页，最大线程1024，但是要比较好的网络条件下，机器配置比较高才不会处问题哦，在服务器上测试效果很好。
(Patted network example to download page as an example, the biggest thread 1024, but relatively good network conditions, the machine configuration will not compare Gao Cai Department issues Oh, on the server to test well.)