${name}

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

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

javaBean导航(map也是可以这样操作的)

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

EL函数库(jstl提供)

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

      <taglib 
              xmlns="http://java.sun.com/xml/ns/j2ee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee       http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
              version="2.0">
          <description>JSTL 1.1 functions library</description>
          <display-name>JSTL functions</display-name>
          <tlib-version>1.1</tlib-version>
          <short-name>fn</short-name>
          <uri>http://java.sun.com/jsp/jstl/xxxcdsds</uri>
          <function>
            <name>getName</name>
            <function-class>com.suse.yuxin.tags.TestTag</function-class>
            <function-signature>java.lang.String getName()</function-signature>
          </function>
      </taglib>

• jsp导入标签并使用

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

Nothing is certain in this life. The only thing i know for sure is that. I love you and my life. That is the only thing i know. have a good day

:)