从头认识Spring-1.13 注入properties与null

这一章节我们来简单讨论一下注入properties与null。

1.domain

厨师类：

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_13;

import java.util.Iterator;
import java.util.Map.Entry;
import java.util.Properties;

public class Chief {

	private static int index = 0;

	private final int id = index++;

	private String name = "";

	private Properties ovens = null;

	public int getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public void userOvens() {
		Iterator<Entry<Object, Object>> it = ovens.entrySet().iterator();
		while (it.hasNext()) {
			Entry<Object, Object> entry = it.next();
			Object key = entry.getKey();
			Object value = entry.getValue();
			System.out.println("oven");
			System.out.println("key   :" + key);
			System.out.println("value :" + value);
			System.out.println("---------------");
		}
	}

	public Properties getOvens() {
		return ovens;
	}

	public void setOvens(Properties ovens) {
		this.ovens = ovens;
	}

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

}

把ovens改成是properties类型的，然后通过<props/>标签注入。

还有就是改变了useOvens的遍历方式。

还有一个地方需要注意，因为使用properties，因此注入的key还有value都是String类型

 

烤炉类：（不变）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_13;

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;
	}

}

2.测试类：（不变）

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_13;

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_13/ApplicationContext-test.xml" })
public class ChiefTest {

	@Autowired
	private ApplicationContext applicationContext;

	@Test
	public void testChief() {
		Chief jack = (Chief) applicationContext.getBean("jack");
		jack.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_13.Oven"
		p:name="bigOven" />

	<bean id="smallOven"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_13.Oven"
		p:name="smallOven" />


	<bean id="jack"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_13.Chief"
		p:name="jack">
		<property name="ovens">
			<props>
				<prop key="bigOven">bigOven</prop>
				<prop key="smallOven">smallOven</prop>
			</props>
		</property>
	</bean>


</beans>

测试输出：

oven
key   :smallOven
value :smallOven
---------------
oven
key   :bigOven
value :bigOven
---------------

 

4.装配null

其实只要在<property/>标签里面使用<null/>即可

<bean id="rose"
		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_13.Chief"
		p:name="rose">
		<property name="ovens">
			<null />
		</property>
	</bean>

 

 

总结：这一章节主要简单介绍了一下注入properties。

 

目录：http://blog.youkuaiyun.com/raylee2007/article/details/50611627 

 

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