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

<a href ="test.jsp?p=fuck">跳轉到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());

%>

顯示結果

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

在一些應用中，未登錄用戶請求了必須登錄的資源時，提示用戶登錄，此時要記住用戶訪問的當前頁面的URL，當他登錄成功後根據記住的URL跳回用戶最後訪問的頁面：

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

假定你的web application 名稱為news,你在瀏覽器中輸入請求路徑：

http://localhost:8080/news/main/list.jsp

則執行下面向行代碼後打印出如下結果：

1、 System.out.println(request.getContextPath());

打印結果：/news

2、System.out.println(request.getServletPath());

打印結果：/main/list.JSP

3、 System.out.println(request.getRequestURI());

打印結果：/news/main/list.JSp

4、 System.out.println(request.getRealPath("/"));

打印結果：F:\tomcat 6.0\webapps\news\test

getRequestURI,getRequestURL的區別