Spring SpEL in JSP and Assign SpEL value to Java variable in JSP

Spring SpEL in JSP and Assign SpEL value to Java variable in JSP

    method 1  use----ServletContextAttributeExporter

org.springframework.web.context.support.ServletContextAttributeExporter

xml----->

-------------------

<bean class="org.springframework.web.context.support.ServletContextAttributeExporter">

        <property name="attributes">

            <map>

            <entry  key="attrname"><value>oracle_name</value></entry>

            <entry  key="attrvalue"><value>235</value></entry>

            </map>

        </property>

    </bean>

jsp----->

  name:  ${attrname}

  password: ${attrvalue}

   <%  //in jsp assign Spel(spring expression) value to java var

   String attrname=(String)application.getAttribute("attrname");

   String attrvalue=(String)application.getAttribute("attrvalue");

   System.out.println(attrname+"----1-----"+attrvalue);

   %>

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    method 2    use-----util:properties

    add your.properties , add add next sentences

    xmlns:util="http://www.springframework.org/schema/util"

     http://www.springframework.org/schema/util

     http://www.springframework.org/schema/util/spring-util-3.0.xsd

    <util:properties id="comProp" location="classpath:/comProp.properties"/>

    jsp add

     //show  ,if not define var ,expression will show value direct.

     <%@taglib prefix="spring" uri="http://www.springframework.org/tags" %>

     <%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

     <spring:eval expression="@comProp.getProperty('db_name')" var="db_name" scope="application"/>

     <spring:eval expression="@comProp.getProperty('db_password')" var="db_password" scope="application"/>

     ${db_name}  /  ${db_password}

   <% //in jsp assign Spel(spring expression) value to java var

   String abc=(String)application.getAttribute("db_name");

   String abcd=(String)application.getAttribute("db_password");

   System.out.println(abc+"---------"+abcd);

   %>

  Reference SpEL tag https://docs.spring.io/spring/docs/current/spring-framework-reference/html/spring-tld.html#spring.tld.eval