<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isELIgnored="false" import="com.xzit.domain.Student"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>首页</title> </head> <% String name = "Marke"; pageContext.setAttribute("user_name",name); Student stu = new Student("岳不群",23); request.setAttribute("stuObj", stu); %> <body bgcolor="#ffeeee"> ${'张无忌'}<br> ${56*2}<br> 从作用域中取出对象：${pageScope.user_name}<br> <%-- <jsp:forward page="el.jsp"></jsp:forward> --%> <a href="el.jsp?stuname=Zhangsan&age=21">请求EL.jsp</a><br> <a href="ELServlet">请求ELServlet</a><br> <form action="el.jsp"> <input type="checkbox" name="likes" value="lanqiu">篮球 <input type="checkbox" name="likes" value="zuqiu">足球 <input type="checkbox" name="likes" value="paiqiu">排球<br> <input type="submit" value="提交"> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>EL 表达式</title> </head> <body bgcolor="#ffeeaa"> 从作用域中访问复合类型对象:${requestScope.stuObj.stuName}<br> 获取请求查询参数：${param.stuname} ${param.age}<br> 获取Cookie:${cookie['username'].name} ${cookie['username'].value}<br> 获取一个请求参数对应多个值的方式：<br> 第一个：${paramValues.likes[0]}<br> 第二个：${paramValues.likes[1]}<br> 第三个：${paramValues.likes[2]}<br> </body> </html>
package com.xzit.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ELServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Cookie cookies[] = request.getCookies(); if(cookies!=null && cookies.length!=0){ int count = 0; for(Cookie c:cookies){ if(c.getName().equals("username")){ count++; break; } } if(count==0){ Cookie cookie = new Cookie("username","Zidane"); cookie.setMaxAge(3600*24); response.addCookie(cookie); } } } }
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>ELapp2</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<display-name>ELServlet</display-name>
<servlet-name>ELServlet</servlet-name>
<servlet-class>com.xzit.servlet.ELServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ELServlet</servlet-name>
<url-pattern>/ELServlet</url-pattern>
</servlet-mapping>
</web-app>
package com.xzit.domain; public class Student { private String stuName; private int age; public Student() { } public String getStuName() { return stuName; } public void setStuName(String stuName) { this.stuName = stuName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Student(String stuName, int age) { super(); this.stuName = stuName; this.age = age; } }