request.getRequestURI和request.getRequestURL返回值

//HttpServletRequest获取请求路径                                                                                                    //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(返回的URI)                                                                                                //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 （返回的URL地址） 

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