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 = "";

	@Override
	public 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 {

	@Autowired
	private ApplicationContext applicationContext;

	@Test
	public 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.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd
		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd
		http://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