HttpClient介绍

参考HttpClient:   http://hc.apache.org/

  PoolingHttpClientConnectionManager

  HttpClient池:http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html
  http://hc.apache.org/httpcomponents-client-ga/examples.html
  JAVA: httpclient 详解——第二章:http://www.tuicool.com/articles/QBjuee
  HttpClient在java中的使用:http://blog.youkuaiyun.com/hwwzyh/article/details/39184677
    http://blog.youkuaiyun.com/hwwzyh/article/details/39184677
 使用httpclient必须知道的参数设置及代码写法、存在的风险  http://jinnianshilongnian.iteye.com/blog/2089792