EL表达式 requestScope initParam用法：
servlet：
package com.stono.servlet; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestServlet7 extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setAttribute("foo.person", "personFoo"); RequestDispatcher dispatcher = req.getRequestDispatcher("index045.jsp"); dispatcher.forward(req, resp); } }
jsp：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>045index</title> </head> <body> ${requestScope["foo.person"] } <hr> ${initParam.email } <hr> ${cookie } </body> </html>
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>TestBootWeb</display-name> <servlet> <servlet-name>test7</servlet-name> <servlet-class>com.stono.servlet.TestServlet7</servlet-class> </servlet> <servlet-mapping> <servlet-name>test7</servlet-name> <url-pattern>/test7.do</url-pattern> </servlet-mapping> <context-param> <param-name>email</param-name> <param-value>a@b.c</param-value> </context-param> <jsp-config> <jsp-property-group> <url-pattern>*.jsp</url-pattern> <el-ignored>false</el-ignored> </jsp-property-group> </jsp-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>