Request的几种得到路径解释
request.getRequestURI() /jqueryWeb/resources/request.jsp
request.getRequestURL() http://localhost:8080/jqueryWeb/resources/request.jsp
request.getContextPath()/jqueryWeb
request.getServletPath()/resources/request.jsp
注： resources为WebContext下的目录名
? jqueryWeb 为工程名
