[size=small][color=red]1.看一下jstl和普通的取值有何區別？
jstl採用的是${}的方式來取值的。
先建一個JstlElServlet：
package com.jxust.jstl;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 測試El表達式
* @author Administrator
*
*/
public class JstlElServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//普通字符串
request.setAttribute("hello", "Hello World");
request.getRequestDispatcher("/jstl_el.jsp").forward(request, response);
}
}
再建一個index.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<a href="servlet/JstlElServlet">測試EL表達式</a><br>
</body>
</html>
再建一個jstl_el.jsp：
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
<h1>測試EL表達式</h1>
<hr>
<li>普通字符串</li><br>
hello(jsp腳本):<%=request.getAttribute("hello") %><br>
hello(el表達式,el表達式使用$和{}):${hello }<br>
</body>
</html>
上面的兩個運行結果都是：
Hello World[/color][/size]
（一）jstl測試el表達式
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