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 = "";@Overridepublic 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 {@Autowiredprivate ApplicationContext applicationContext;@Testpublic 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.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_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.csdn.net/raylee2007/article/details/50611627 

 

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