Spring - Bean实例化的几种配置

1，资源类

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2，静态工厂实例化(很少用)

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<bean id="testComponent" class="com.hzq.TestComponentFactory"
          factory-method="getTestComponent">
</bean>

2，实例工厂实例化(很少用)

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<bean id="testComponentFactory" class="com.hzq.TestComponentFactory"></bean>
<bean id="testComponent" factory-bean="testComponentFactory" factory-method="getTestComponent"></bean>

3，无参构造函数实例化

<bean id="testComponent" class="com.lianjia.businessHubLoan.TestComponent"></bean>

4，有参构造函数实例化

<bean id="testService" class="com.lianjia.businessHubLoan.TestService">
        <constructor-arg index="0" name="component" value="testComponent"></constructor-arg>
</bean>