在spring的servletcontextlistener的init方法的生命周期问题

Question

在服务器启动的时候通过监听开启一个线程，通过调用控制器里面的一个方法，从网上的一个数据接口获取数据添加到数据库里，但是就在控制器调用service的时候总是报空指针，我开始以为是因为线程之间的异步加载导致service还没有注进去，但我后来给线程加了延迟之后还是会报空指针，是因为session工厂的生命周期问题吗
我试了从地址栏访问控制器里面的方法是可以正常调用service并且把数据添加到数据库里的，但是从线程里调用就汇报空指针，求大神解救

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

其实解决很简单，ServletContextEvent可以拿到ServletContext，ServletContext可以拿到Spring上下午，Spring上下文可以拿到你的NewsService，OK，问题搞定。

Answer 6

你这个注解是没用的，你这个监听器跟spring没关系，所以spring是不会给你这个里面注入service的，方法用两种，一，使用spring事件监听器，在spring初始化完成时候会触发监听器，但是这种方式那个事件监听器会被触发两次，所以要考虑不能重复执行的问题，还有一种就是通过webapplicationcontextutil获取spring上下文，然后获取service，要求是监听器必须配置在spring后面

Answer 7

WebApplicationContext wac =WebApplicationContextUtils. getWebApplicationContext(servletContext); wac.getBean("newsService");