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();
假定你的web application 名称为news,你在浏览器中输入请求路径：
http://localhost:8080/news/main/list.jsp
则执行下面向行代码后打印出如下结果：
1、 System.out.println(request.getContextPath());
打印结果：/news
2、System.out.println(request.getServletPath());
打印结果：/main/list.JSP
3、 System.out.println(request.getRequestURI());
打印结果：/news/main/list.JSp
4、 System.out.println(request.getRealPath("/"));
打印结果：F:\tomcat 6.0\webapps\news\test
getRequestURI,getRequestURL的区别
原文地址：https://www.cnblogs.com/xiarongjin/p/8390701.html