Java Tutorial/Spring/Dependency Injection

Contextualized Dependency Lookup Demo

File: context.properties

source.(class)=SimpleMessageData
destination.(class)=StdoutMessageReporter
service.(class)=DefaultMessageService
service.source(ref)=source
service.destination(ref)=destination

dependency check Demo

File: context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="target1" class="SimpleBean"
            dependency-check="simple">
        <property name="someInt" value="1"/>
    </bean>
    <bean id="target2" class="SimpleBean"
        dependency-check="objects">
        <property name="nestedSimpleBean" ref="nestedSimpleBean"/>
    </bean>
    <bean id="target3" class="SimpleBean"
        dependency-check="all">
        <property name="nestedSimpleBean" ref="nestedSimpleBean"/>
        <property name="someInt" value="1"/>
    </bean>
    <bean id="nestedSimpleBean" class="SimpleBean"/>
</beans>

Dependency Pull Demo

File: context.properties

source.(class)=SimpleMessageData
destination.(class)=StdoutMessageReporter
service.(class)=DefaultMessageService
service.source(ref)=source
service.destination(ref)=destination

Setter Dependency Injection Demo

File: context.properties

source.(class)=SimpleMessageData
destination.(class)=StdoutMessageReporter
service.(class)=DefaultMessageService
service.source(ref)=source
service.destination(ref)=destination

Spring bean dependency Demo

File: context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="b" class="B" depends-on="a"/>
    <bean id="a" class="A"/>
</beans>