从头认识Spring-1.12 注入Map

Posted 2020-06-13 李灵晖

这一章节我们简单介绍一下注入Map。

1.domain

烤炉类：（基本没什么变化）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_12;

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：（为了简便性，我删除了前面的Cake的list）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_12;

import java.util.HashMap;

public class Chief {

	private static int index = 0;

	private final int id = index++;

	private String name = "";

	private HashMap<String, Oven> ovens = null;

	public int getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public void userOvens() {
		for (String key : ovens.keySet()) {
			System.out.println("oven key:" + key);
			System.out.println(name + " use " + ovens.get(key));
		}
	}

	public void setName(String name) {
		this.name = name;
	}

	public HashMap<String, Oven> getOvens() {
		return ovens;
	}

	public void setOvens(HashMap<String, Oven> ovens) {
		this.ovens = ovens;
	}

}

而且我修改了userOvens这个方法，把他变成遍历Map。

2.测试类：（为了简便测试，我删减了制作蛋糕的动作）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_12;

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_12/ApplicationContext-test.xml" })
public class ChiefTest {

	@Autowired
	private ApplicationContext applicationContext;

	@Test
	public void testChief() {
		Chief jack = (Chief) applicationContext.getBean("jack");
		jack.userOvens();
		System.out.println("--------------------");
		Chief rose = (Chief) applicationContext.getBean("rose");
		rose.userOvens();
	}
}

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_12.Oven"
		p:name="bigOven" />

	<bean id="smallOven"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_12.Oven"
		p:name="smallOven" />


	<bean id="jack"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_12.Chief"
		p:name="jack">
		<property name="ovens">
			<map>
				<entry key="bigOven" value-ref="bigOven" />
				<entry key="bigOven" value-ref="bigOven" />
				<entry key="smallOven" value-ref="smallOven" />
			</map>
		</property>
	</bean>

	<bean id="rose"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_12.Chief"
		p:name="rose">
		<property name="ovens">
			<map>
				<entry key="smallOven" value-ref="smallOven" />
			</map>
		</property>
	</bean>

</beans>

跟之前的配置文件对比，这里用map替代了之前的set或者list，然后在entry里面需要加上key这个属性。

测试输出：

oven key:bigOven
jack use bigOven
oven key:smallOven
jack use smallOven
--------------------
oven key:smallOven
rose use smallOven

 

4.注意

entry里面的属性有

key 对应的是值

key-ref 对应的是对象的引用

value 对应的是值

value-ref 对应的是对象的引用

总结：这一章节简单介绍了注入Map。

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

 

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