EL表达式

${name}

• 全域查找
• pageContext --> request --> session --> application

${sessionScope.name} //指定域查找
${pageScope.name}
${requestScope.name}
${applicationScope.name}

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javaBean导航(map也是可以这样操作的)

${object.name}
${map['key']}

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EL函数库(jstl提供)

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自定义函数库

java类 静态方法

• 创建java类

  package com.suse.yuxin.tags;
    public class TestTag {  
      public static String getName(){
        return "name";
      }
    }

• 创建tld文件 并放到WEB-INF/下面

      
          JSTL 1.1 functions library
          JSTL functions
          1.1
          fn
          http://java.sun.com/jsp/jstl/xxxcdsds
          
            getName
            com.suse.yuxin.tags.TestTag
            java.lang.String getName()
          
      

• jsp导入标签并使用

  <%@ taglib prefix="my" uri="/WEB-INF/tlds/nametls.tld" %>
  ${my:getName()}

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