HttpServletRequest获取请求路径

 HttpServletRequest获取请求路径
 1、        //Returns the part of this request's URL from the protocol name up to the query string in the first line of the HTTP request
         //  eg.  /ser.do?method=add_pre&type=mad
         String url = request.getRequestURI();
     return /ssm/ser.do
 2、        //The returned URL contains a protocol, server name, port number, and server path, but it does not include query string parameters
           //eg.      http://localhost:8080/ssm/ser.do?method=add_pre&type=mad
         StringBuffer url_buffer = request.getRequestURL();
     return http://localhost:8080/ssm/ser.do

HttpServletRequest 的这两种方法都只能得到不包含参数的请求url，区别如下： 

1 前者返回相对路径，后者返回完整路径 

2 前者返回string ，后者返回stringbuffer 

要想得到完整请求url可以通过如下方法，getQueryString()得到的是url后面的参数串，和前者相加就是带参数的请求路径了 

     String queryString = request.getQueryString();
 String fullPath = url + queryString;
 // 或者是url_buffer.toString()+queryString;
 即 /ssm/ser.do + method=add_pre&type=mad