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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76300

09984

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19532

32807

76209

75200

83309

08521

22966

97430

65196

10643

38862

16632

76306

10662

32865

19653

14049

00982

67355

15464

85431

26967

15560

08437

34059

28852

60689

63192

66913

96602

52241

36601

60545

36548

57914

08851

41190

96619

93571

14011

01290

52277

03618

22593

93201

04917

75423

15149

99641

18375

41756

67778

36080

92242

66312

34353

48214

41705

20932

Answer 2

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https://www.imooc.com/wenda/detail/355598

https://www.imooc.com/wenda/detail/333768

https://www.imooc.com/wenda/detail/353118

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https://www.imooc.com/wenda/detail/338489

https://www.imooc.com/wenda/detail/354468

https://www.imooc.com/wenda/detail/337321

https://www.imooc.com/wenda/detail/352255

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https://www.imooc.com/wenda/detail/347044

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https://www.imooc.com/wenda/detail/346651

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https://www.imooc.com/wenda/detail/350553

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https://www.imooc.com/wenda/detail/353463

https://www.imooc.com/wenda/detail/341687

https://www.imooc.com/wenda/detail/342161

https://www.imooc.com/wenda/detail/332237

Answer 3

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https://www.imooc.com/wenda/detail/355598

https://www.imooc.com/wenda/detail/333768

https://www.imooc.com/wenda/detail/353118

https://www.imooc.com/wenda/detail/339465

https://www.imooc.com/wenda/detail/338489

https://www.imooc.com/wenda/detail/354468

https://www.imooc.com/wenda/detail/337321

https://www.imooc.com/wenda/detail/352255

https://www.imooc.com/wenda/detail/341255

https://www.imooc.com/wenda/detail/347044

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https://www.imooc.com/wenda/detail/346302

https://www.imooc.com/wenda/detail/335921

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Answer 4

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https://www.imooc.com/wenda/detail/355598

https://www.imooc.com/wenda/detail/333768

https://www.imooc.com/wenda/detail/353118

https://www.imooc.com/wenda/detail/339465

https://www.imooc.com/wenda/detail/338489

https://www.imooc.com/wenda/detail/354468

https://www.imooc.com/wenda/detail/337321

https://www.imooc.com/wenda/detail/352255

https://www.imooc.com/wenda/detail/341255

https://www.imooc.com/wenda/detail/347044

https://www.imooc.com/wenda/detail/340763

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https://www.imooc.com/wenda/detail/348590

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https://www.imooc.com/wenda/detail/349520

https://www.imooc.com/wenda/detail/333275

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https://www.imooc.com/wenda/detail/347656

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https://www.imooc.com/wenda/detail/353425

https://www.imooc.com/wenda/detail/338283

https://www.imooc.com/wenda/detail/332456

https://www.imooc.com/wenda/detail/336188

https://www.imooc.com/wenda/detail/333373

https://www.imooc.com/wenda/detail/340869

https://www.imooc.com/wenda/detail/353463

https://www.imooc.com/wenda/detail/341687

https://www.imooc.com/wenda/detail/342161

https://www.imooc.com/wenda/detail/332237

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");