http/https请求工具类

//提交方式publicstaticStringREQUEST_METHOD_POST="POST";publicstaticStringREQUEST_METHOD_GET="GET";//媒体类型publicstaticStringMIME_TYPE_FORM="application/x-www-form-urlencoded;charset=utf-8";publicstaticStringMIME_TYPE_XML="application/xml;charset=utf-8";publicstati