意思就是往request中，利用outpustream写入值。
可以利用httpUrlConnection或者httpclient都可以。
注意到这种方式：既可以用key=value的形式写入，也可以直接写入value.
参考链接：
http://stackoverflow.com/questions/9948980/what-do-i-write-with-outputstream-in-java-if-i-want-to-send-an-http-request
http://httpcomponents.10934.n7.nabble.com/help-how-to-set-an-OutputStream-to-a-POST-request-td14286.html
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