對象創(chuàng)建時機(jī)

<!--單例加載xml時創(chuàng)建，多例調(diào)用getbean時創(chuàng)建-->
    <bean scope="singleton" id="hello" class="org.spring.HelloFactory" factory-method="getHello"></bean>
    <bean scope="prototype" id="hello" class="org.spring.HelloFactory" factory-method="getHello"></bean>

單例生命周期

<bean init-method="init" destroy-method="des" scope="singleton" id="hello" class="org.spring.HelloFactory" factory-method="getHello"></bean>

容器銷毀觸發(fā)des方法
((ClassPathXmlApplicationContext) context).close();

多例生命周期

對象消亡利用java垃圾回收

di依賴注入

構(gòu)造函數(shù)注入

基本類型直接注入
對象類型先由容器創(chuàng)建對象后ref引用

<bean init-method="init" destroy-method="des" scope="singleton" id="hello" class="org.spring.Hello">
        <constructor-arg name="age" value="24"></constructor-arg>
        <constructor-arg name="date" ref="now"></constructor-arg>
    </bean>
    <bean id="now" class="java.util.Date"></bean>

必須重寫構(gòu)造方法

set方法注入

<bean init-method="init" destroy-method="des" scope="singleton" id="hello" class="org.spring.Hello">
        <property name="age" value="25"></property>
    </bean>

調(diào)用默認(rèn)構(gòu)造方法生成對象后調(diào)用set方法賦值

給復(fù)雜類型賦值

<bean init-method="init" destroy-method="des" scope="singleton" id="hello" class="org.spring.Hello">
        <property name="arr">
            <array>
                <value>1</value>
                <value>50</value>
            </array>
        </property>
    </bean>