解释afterPropertiesSet
在spring的bean的生命周期中，实例化->生成对象->属性填充后会进行afterPropertiesSet方法，这个方法可以用在一些特殊情况中，也就是某个对象的某个属性需要经过外界得到，比如说查询数据库等方式，这时候可以用到spring的该特性，只需要实现InitializingBean即可：
@Component("a")public class A implements InitializingBean {private B b;public A(B b) {this.b = b;}@Overridepublic void afterPropertiesSet() throws Exception {}}
这样可以在afterPropertiesSet方法中进行你的额外操作。
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