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xiachaochao
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EL表达式练习2017.5.10
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‎JavaWeb/WebContent/EL/HTML/param_values_demo.html‎

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>www.crazyjava.cn</title>
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</head>
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<body>
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<form action="../JSP/param_values_demo.jsp" method="post">
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<p>兴趣</p>
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<input type="checkbox" name="inst" value="唱歌"/>唱歌
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<input type="checkbox" name="inst" value="游泳"/>游泳
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<input type="checkbox" name="inst" value="看书"/>看书
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<input type="submit" value="显示 "/>
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</form>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/ELDemo02.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>运算符</title>
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</head>
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<body>
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<h1>比较运算符</h1>
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<b> 4 &gt;3 --> $ {4>3} <br> 4&lt;3-->${4<3}<br>
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</b>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/ElDemo01.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<% pageContext.setAttribute("color","lightyellow"); %>
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<title>Insert title here</title>
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</head>
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<body bgcolor=${pageScope.color}>
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<%-- 10+5=${10+5}<br>
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10/5=${10/5}<br> --%>
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<%-- ${'${'}true or true}<!-- 注意此处这种写法 --> --%>
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<h1>测试</h1>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/get_attribute_demo.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>get_attribute_demo</title>
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</head>
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<body>
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<%
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pageContext.setAttribute("info", "page属性范围");
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request.setAttribute("info", "request属性范围");
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session.setAttribute("info", "session属性范围");
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application.setAttribute("info", "application属性范围");
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%>
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<h3>page属性内容：${pageScope.info}</h3>
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<h3>request属性内容：${requestScope.info}</h3>
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<h3>session属性内容：${sessionScope.info}</h3>
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<h3>application属性内容：${applicationScope.info}</h3>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/invoke_method.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>www.crazyjava.cn</title>
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</head>
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<body>
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<h3>IP地址：${pageContext.request.remoteAddr}</h3>
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<h3>SESSION ID：${pageContext.session.id}</h3>
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<%-- <h3>是否是新：${pageContext.session.isNew()}</h3>该段代码可用，但是会报语法检查错误--%>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/param_values_demo.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>www.crazyjava.cn</title>
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</head>
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<body>
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<%
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request.setCharacterEncoding("UTF-8");
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%>
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<h3> 第一个参数：${paramValues.inst[0]}</h3>
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<h3> 第二个参数：${paramValues.inst[1]}</h3>
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<h3> 第三个参数：${paramValues.inst[2]}</h3>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/print_attribute_demo01.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>print_attribute_demo01</title>
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</head>
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<body>
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<%
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request.setAttribute("info", "www.crazyjava.cn");
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if (request.getAttribute("info") != null) {
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%>
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<h3><%=request.getAttribute("info")%></h3>
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<%
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}
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%>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/print_attribute_demo02.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>print_attribute_demo02</title>
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</head>
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<body>
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<%
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request.setAttribute("info","www.crazyjava.cn");
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%>
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<h3> ${info} </h3>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/print_collection.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<%@page import="java.util.*"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>www.crazyjava.cn</title>
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</head>
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<body>
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<!--测试list集合操作-->
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<%
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List all = new ArrayList();//注意导包
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all.add("crazy");
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all.add("www.crazyjava.cn");
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all.add("[email protected]");
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request.setAttribute("allinfo", all);
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%>
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<h3>第一个元素:${allinfo[0]}</h3>
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<h3>第二个元素:${allinfo[1]}</h3>
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<h3>第三个元素:${allinfo[2]}</h3>
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<hr>
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<%
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Map map = new HashMap();
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map.put("crazy", "阿超");
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map.put("website", "www.crazyjava.cn");
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map.put("email", "[email protected]");
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request.setAttribute("info", map);
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%>
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<h3>KEY为crazy的内容:${info["crazy"]}</h3>
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<h3>KEY为website的内容:${info["website"]}</h3>
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<h3>KEY为email的内容:${info["website"]}</h3>
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</body>
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</html>

‎JavaWeb/WebContent/EL/JSP/repeat_attribute_demo.jsp‎

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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>repeat_attribute_Demo</title>
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</head>
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<body>
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<%
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pageContext.setAttribute("info", "page属性页面");
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request.setAttribute("info", "request属性页面");
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session.setAttribute("info", "session属性页面");
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application.setAttribute("info", "application属性页面");
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%>
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<h3>${info}</h3>
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</body>
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</html>

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