httpclient通过POST来上传文件，而不是通过流的形式，并在服务端进行解析(通过httpmime.jar来操作)
这个文件是你将文件上传到服务器上的时候，所需要的文件，另外httpmine对httpclient等包有依赖，所以最好你httpmine与httpclient，httpcore的版本号一致。
Project Dependencies
compile
The following is a list of compile dependencies for this project. These dependencies are required to compile and run the application:
GroupIdArtifactIdVersionTypeLicense
org.apache.httpcomponents httpclient4.3.6jar Apache License, Version 2.0
来源：oschina
链接：https://my.oschina.net/u/2308739/blog/402067