java学习课程之bean的获取和属性赋值

HelloWorld helloWorld = cxt.getBean(HelloWorld. class);

HelloWorld helloWorld = cxt.getBean(“helloWorld”,HelloWorld. class);

     <bean id=“book” class=“com.atguigu.spring.bean.Book” >

           <constructor-arg value= “10010”/>

           <constructor-arg value= “Book01”/>

           <constructor-arg value= “Author01”/>

           <constructor-arg value= “20.2”/>

     </bean >

     <bean id=“book” class=“com.atguigu.spring.bean.Book” >

           <constructor-arg value= “10010” index =“0”/>

           <constructor-arg value= “Book01” index =“1”/>

           <constructor-arg value= “Author01” index =“2”/>

           <constructor-arg value= “20.2” index =“3”/>

     </bean >

<bean id=“book” class=“com.atguigu.spring.bean.Book” >

      <constructor-arg value= “10010” index =“0” type=“java.lang.Integer” />

      <constructor-arg value= “Book01” index =“1” type=“java.lang.String” />

      <constructor-arg value= “Author01” index =“2” type=“java.lang.String” />

      <constructor-arg value= “20.2” index =“3” type=“java.lang.Double” />

</bean >

<bean

         id=“studentSuper”

         class=“com.atguigu.helloworld.bean.Student”

         p:studentId=“2002” p:stuName=“Jerry2016” p:age=“18” />

     <bean class=“com.atguigu.spring.bean.Book” id=“bookNull” >

           <property name= “bookId” value =“2000”/>

           <property name= “bookName”>

               <null/>

           </property>

           <property name= “author” value =“nullAuthor”/>

           <property name= “price” value =“50”/>

     </bean >

     <bean id=”action” class=”com.atguigu.spring.ref.Action”>

          <property name=”service” ref=”service”/>

          <!– 设置级联属性(了解) –>

          <property name=”service.dao.dataSource” value=”DBCP”/>

     </bean>

     <bean id=“shop” class=“com.atguigu.spring.bean.Shop” >

           <property name= “book” ref =“book”/>

     </bean >

<bean id=“shop2” class=“com.atguigu.spring.bean.Shop” >

    <property name= “book”>

        <bean class= “com.atguigu.spring.bean.Book” >

           <property name= “bookId” value =“1000”/>

           <property name= “bookName” value=“innerBook” />

           <property name= “author” value=“innerAuthor” />

           <property name= “price” value =“50”/>

        </bean>

    </property>

</bean >