Java Tutorial/Spring/Constructor Injection

Constructor Argument And Local Reference

File: context.xml

   <source lang="java">

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"

   "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

 <bean id="RangeService" class="RangeServiceImpl">
   <constructor-arg>
     <ref local="RangeDao"/>
   </constructor-arg>
 </bean>
 <bean id="RangeDao" class="StaticDataRangeDaoImpl">
 </bean>

</beans></source>

Constructor Caller In Context Config

File: context.xml

   <source lang="java">

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"

   "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

  <bean id="testBean" class="ConstructorTestBean">
     <constructor-arg value="Steven Devijver"/>

     <constructor-arg value="1" type="java.lang.Integer"/>
  </bean>

</beans></source>

Constructor Confusion Demo

File: context.xml

   <source lang="java">

<?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="constructorConfusion" class="ConstructorConfusionDemo">
       <constructor-arg value="1" type="int"/>
   </bean>

</beans></source>

XML Based Bean Configuration: Constructor Injection

File: context.xml

   <source lang="java">

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"

      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:util="http://www.springframework.org/schema/util"
      xsi:schemaLocation="
               http://www.springframework.org/schema/beans
               http://www.springframework.org/schema/beans/spring-beans.xsd
               http://www.springframework.org/schema/util
               http://www.springframework.org/schema/util/spring-util.xsd">
   <bean id="encyclopedia"
         name="knowitall"
         class="ConfigurableEncyclopedia">
       <constructor-arg>
           <util:map>
               <entry key="AgeOfUniverse" value="13700000000"/>
               <entry key="ConstantOfLife" value="326190476"/>
           </util:map>
       </constructor-arg>
   </bean>
   <bean id="oracle" class="BookwormOracle">
       <property name="encyclopedia" ref="knowitall"/>
   </bean>

</beans></source>