Spring jndi 注入 datasourse 为什么总是不正确

刚开始学Spring 和jndi，按照网上的配置写的代码如下，但是总是不能输出需要的代码 ，但是 使用   ds = (DataSource) ctx.lookup("jdbc/zxdy");  的方法能够正确获取数据源
，请各位大侠帮我分析一下，多多指点，不胜感激！

第一步 context的配置文件为

<Context>

<Resource

driverClassName="com.mysql.jdbc.Driver"

name="jdbc/zxdy"

auth="Container"

type="javax.sql.DataSource"

maxActive="100" maxIdle="30" maxWait="10000"

username="root" password="123456"

url="jdbc:mysql://localhost:3306/zxdy"/>

</Context>

第二步 applicationcontext.xml

<beans default-autowire="byName"

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

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

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

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

<!--通过JNDI获得数据源的引用-->

<bean id="zxdyDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">

<property name="jndiName">

<value>java:comp/env/jdbc/zxdy</value>

</property>

</bean>

<!-- 配置JdbcTemplate的bean -->

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

<property name="dataSource">

<ref local="zxdyDataSource"/>

</property>

</bean>

<!-- 配置DBUtil的bean 并注入资源-->

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