spring中实现自己的初始化逻辑

实现这两个listener都可以进行自己的初始化逻辑。

InitializingBean.afterPropertiesSet 这个优先调用

ApplicationListener.onApplicationEvent 这个后调用

他们分别由 AbstractApplicationContext.refresh 方法

调用的如下两个函数调用到的：

finishBeanFactoryInitialization(beanFactory);

finishRefresh();

public class InitListener implements ApplicationListener, InitializingBean {

    @Resource
    private AboutDao aboutDao;

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("afterPropertiesSet");

        Integer count = 0;
        try {
            count = aboutDao.count();
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(count);

    }

    @Override
    public void onApplicationEvent(ApplicationEvent event) {

        //防止重复调用
        ApplicationContext ctx = (ApplicationContext) event.getSource();
        if (ctx.getParent() != null) {
            return;
        }

        System.out.println("onApplicationEvent");
        Integer count = 0;
        try {
            count = aboutDao.count();
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(count);

    }
}