EL表达式和JSTL标签

本文介绍了EL表达式的概念、语法及应用场景,并详细解释了如何利用EL表达式简化JSP页面中的Java代码编写。此外,还介绍了JSTL标签库的作用、使用步骤及常用标签,帮助开发者更高效地进行Web开发。

EL表达式

1. 概念:Expression Language 表达式语言
2. 作用:替换和简化jsp页面中java代码的编写
3. 语法:${表达式}
4. 注意:
	* jsp默认支持el表达式的。如果要忽略el表达式
		1. 设置jsp中page指令中:isELIgnored="true" 忽略当前jsp页面中所有的el表达式
		2. \${表达式} :忽略当前这个el表达式


5. 使用:
	1. 运算:
		* 运算符:
			1. 算数运算符: + - * /(div) %(mod)
			2. 比较运算符: > < >= <= == !=
			3. 逻辑运算符: &&(and) ||(or) !(not)
			4. 空运算符: empty
				* 功能:用于判断字符串、集合、数组对象是否为null或者长度是否为0
				* ${empty list}:判断字符串、集合、数组对象是否为null或者长度为0
				* ${not empty str}:表示判断字符串、集合、数组对象是否不为null 并且 长度>0
	2. 获取值
		1. el表达式只能从域对象中获取值
		2. 语法:
			1. ${域名称.键名}:从指定域中获取指定键的值
				* 域名称:
					1. pageScope		--> pageContext
					2. requestScope 	--> request
					3. sessionScope 	--> session
					4. applicationScope --> application(ServletContext)
				* 举例:在request域中存储了name=张三
				* 获取:${requestScope.name}

			2. ${键名}:表示依次从最小的域中查找是否有该键对应的值,直到找到为止。

			
			
			3. 获取对象、List集合、Map集合的值
				1. 对象:${域名称.键名.属性名}
					* 本质上会去调用对象的getter方法

				2. List集合:${域名称.键名[索引]}

				3. Map集合:
					* ${域名称.键名.key名称}
					* ${域名称.键名["key名称"]}


	3. 隐式对象:
		* el表达式中有11个隐式对象
		* pageContext:
			* 获取jsp其他八个内置对象
				* ${pageContext.request.contextPath}:动态获取虚拟目录

JSTL

1. 概念:JavaServer Pages Tag Library  JSP标准标签库
	* 是由Apache组织提供的开源的免费的jsp标签		<标签>

2. 作用:用于简化和替换jsp页面上的java代码		

3. 使用步骤:
	1. 导入jstl相关jar包
	2. 引入标签库:taglib指令:  <%@ taglib %>
	3. 使用标签

4. 常用的JSTL标签
	1. if:相当于java代码的if语句
		1. 属性:
            * test 必须属性,接受boolean表达式
                * 如果表达式为true,则显示if标签体内容,如果为false,则不显示标签体内容
                * 一般情况下,test属性值会结合el表达式一起使用
   		 2. 注意:
       		 * c:if标签没有else情况,想要else情况,则可以在定义一个c:if标签
	2. choose:相当于java代码的switch语句
		1. 使用choose标签声明         			相当于switch声明
        2. 使用when标签做判断         			相当于case
        3. 使用otherwise标签做其他情况的声明    	相当于default

	3. foreach:相当于java代码的for语句

5. 练习:
	* 需求:在request域中有一个存有User对象的List集合。需要使用jstl+el将list集合数据展示到jsp页面的表格table中
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