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());
%>
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();
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