java中HttpServletRequest可获取的URI方法介绍

HttpServletRequest 方法可获取的URI, 以http://localhost:8080/project/path/test?param=val 为例
request.getPathInfo()：返回/path/test
request.getRequestURL()：返回http://localhost:8080/project/path/test
request.getRequestURI()：返回/project/path/test
request.getServletPath()：返回/project
request.getQueryString()：返回param=val