Java代码:
package com.java.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Request extends HttpServlet {
private static final long serialVersionUID = 1L;
public Request() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setAttribute("money", 5000);
//转发到页面
request.getRequestDispatcher("HTML/index.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
JSP代码:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!-- 引入C标签库 -->
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!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>JSP 标准标签库(JSTL)</title>
</head>
<body style="text-align: center;">
<!--
var:变量名
scope:变量的作用域
value:要储存的值
-->
<c:set var="salary" scope="session" value="${2000*2}"/>
<h1>我的工资是:${ salary }</h1>
<!--
scope的作用域大小依次为：
application > session > request > page(默认)
jsp处理变量的作用域先后依次为：
page(默认) -> request -> session -> application
-->
<!-- 比较的变量money是从Request转发过来的 -->
<c:if test="${ salary < money }">
<h1>我的工资小于5000</h1>
</c:if>
<h1><a href="http://www.runoob.com/jsp/jsp-jstl.html" target="view_window" style="text-decoration: none; color: red;">查看更多使用方法点我</a></h1>
</body>
</html>
项目图片:
需要引用的lib里的2个jar包
