test1.jsp=======================

<a href ="test.jsp?p=fuck">跳转到test2</a>

test2.jsp=======================

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>

<%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

out.println("basePath:"+basePath);

out.println("<br/>");out.println("getContextPath:"+request.getContextPath());out.println("<br/>");out.println("getServletPath:"+request.getServletPath());out.println("<br/>");out.println("getRequestURI:"+request.getRequestURI());out.println("<br/>");out.println("getRequestURL:"+request.getRequestURL());out.println("<br/>");out.println("getRealPath:"+request.getRealPath("/"));out.println("<br/>");out.println("getServletContext().getRealPath:"+getServletContext().getRealPath("/"));out.println("<br/>");out.println("getQueryString:"+request.getQueryString());

%>

 

显示结果：

basePath:http://localhost:8080/test/

getContextPath:/test

getServletPath:/test.jsp

getRequestURI:/test/test.jsp

getRequestURL:http://localhost:8080/test/test.jsp

getRealPath:D:\Tomcat 6.0\webapps\test\

getServletContext().getRealPath:D:\Tomcat 6.0\webapps\test\

getQueryString:p=fuck

在一些应用中，未登录用户请求了必须登录的资源时，提示用户登录，此时要记住用户访问的当前页面的URL，当他登录成功后根据记住的URL跳回用户最后访问的页面：

String lastAccessUrl = request.getRequestURL() + "?" + request.getQueryString();