从头认识Spring-1.14 SpEl表达式（2）-嵌入Bean、Bean的属性和Bean的方法

这一章节我们来讨论一下使用SpEl表达式嵌入Bean、属性和方法。

1.domain

烤炉类：（不变）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15;public class Oven {private String name = "";@Overridepublic String toString() {return name;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

厨师类：

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15;public class Chief {private String name = "";private Oven oven;public String getName() {return name;}public Oven getOven() {return oven;}public void setName(String name) {this.name = name;}public void setOven(Oven oven) {this.oven = oven;}public void userOven() {System.out.println(name + " use " + oven);}}

厨师类改动了，这里每一个厨师只能够使用一个烤炉

2.测试类

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = {"/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_15/ApplicationContext-test.xml" })public class ChiefTest {@Autowiredprivate ApplicationContext applicationContext;@Testpublic void testChief() {Chief jack = (Chief) applicationContext.getBean("jack");jack.userOven();Chief rose = (Chief) applicationContext.getBean("rose");rose.userOven();Chief mike = (Chief) applicationContext.getBean("mike");mike.userOven();Chief dick = (Chief) applicationContext.getBean("dick");dick.userOven();}}

打印各个厨师使用烤炉

3.配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><!-- <bean id="cake" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_10.Cake" p:Name="jack's own cake"> <property name="size" value="7"></property> </bean> --><bean id="bigOven"class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15.Oven"p:name="bigOven" /><bean id="smallOven"class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15.Oven"p:name="smallOven" /><bean id="jack"class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15.Chief"p:name="jack"><property name="oven" ref="smallOven" /></bean><bean id="rose"class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15.Chief"p:name="rose"><property name="oven" ref="#{jack.oven}" /></bean><bean id="mike"class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15.Chief"p:name="mike"><property name="oven" ref="#{jack.getOven()}" /></bean><bean id="dick"class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_15.Chief"p:name="dick"><property name="oven" ref="#{bigOven}" /></bean></beans>

这里面有一个注意点：

在<property/>标签里面的ref属性，我们使用了不同的描述，分别是：

smallOven：指的是Bean的id，常用方法

#{bigOven}：意义同上

#{jack.oven}：指得是jack所使用的烤炉，使用jack的某个属性

#{jack.getOven()}：指得是jack所使用的烤炉，使用jack的某个方法

测试输出：

jack use smallOven
rose use smallOven
mike use smallOven
dick use bigOven

总结：这一章节举例说明使用SpEl表达式嵌入Bean、Bean的属性和Bean的方法。

目录：http://blog.csdn.net/raylee2007/article/details/50611627 

 

我的github：https://github.com/raylee2015/my_new_spring