基于SpringBoot,SSM的Filter,Servlet,Listener,Interceptor的实现

关于Servlet Listener 和Filter 有两种注册方式:

PS:本人的Spring版本是5.x 非4.x

注意要在启动类上加上@ServletComponentScan注解 不然Servlet,Listener,Filter都不会启作用

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1. @WebServlet(name="servletTest1",urlPatterns="/servlet/test"
2. publicclassextends
4. privatestaticfinallong
5. @Override
6. protectedvoidthrows
10. @Override
11. protectedvoidthrows

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1. @WebListener
2. publicclassimplements
4. @Override
5. publicvoid
7. "dddddd"
10. @Override
11. publicvoid

Filter:

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1. @WebFilter(urlPatterns="/annotation/test1"
2. publicclassimplements
4. @Override
5. publicvoidthrows
8. @Override
9. publicvoid
10. throws
15. @Override
16. publicvoid

Interceptor:

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1. publicclassimplements
3. @Override
4. publicbooleanthrows
6. "在controller之前执行,只有这个返回true,postHandler才会执行"
7. returnsuper
9. @Override
10. publicvoid
11. throws
13. "controller之后,在渲染页面之前执行"
15. @Override
16. publicvoid
17. throws
19. "渲染页面之后执行"
22. @Configuration
23. publicclassimplements
25. @Override
26. publicvoid
28. new"/interceptor/*"

我的版本是Spring5.x WebMvcConfigurer 提供了默认的接口的实现方式,所以只需要implements即可,5.x以下的版本需要extends WebMvcConfigurerAdapter 即可

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------第二种形式:基于Java Config

Servlet: Servlet类的写法:只需要继承HttpServlet即可

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1. @Bean
2. public
4. new
5. new
6. "/servlet/test2"
7. return
9. @Bean
10. public
12. new
13. new
14. "/servlet/test3"
15. return

Filter:实现了Filter接口即可,Filter之间的执行顺序通过order来实现,order的值越低越先执行

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1. @Bean
2. public
4. new
5. new
6. "/filter/test/*"
7. 1
8. return
11. @Bean
12. public
14. new
15. new
16. "/filter/test/*"
17. 2
18. return

Listener: 根据需求实现不同的listener接口即可

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1. @Bean
2. public
4. new
5. new
6. return

Interceptor:与上面写的那种Interceptor相同

-------------------------------------

PS:因为本人搭建SSM项目更喜欢于采用JavaConfig的形式,怕麻烦,哈哈(不不不,该说SSM项目搭建有点烦),所以此处直接随意新建了个web.xml来代替

Servlet:

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3. class>com.test.servlet.ServletJavaConfigTest3</servlet-class

Listener:

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2. class>com.test.listener.ListenerTest1</listener-class

Filter:

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3. class>com.test.filter.AnnotationFilterTest1</filter-class

Interceptor是特殊的存在,他是基于SpringMVC的,所以要在Spring的配置文件中配置,但是本人更喜欢JavaConfig的形式,所以更喜欢:

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1. @Configuration
2. publicclassimplements
4. @Override
5. publicvoid
7. new"/interceptor/*"
8. new"/interceptor/33"

而非: (随个人喜好!!!!!!!!!!!!!!!!!!!!!!!!!)

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3. "/admin"
4. class="com.test.blog.Interceptor.SecurityInterceptor"
7. "/admin/**"
8. class="com.test.blog.Interceptor.SecurityInterceptor"

文章来源: 基于SpringBoot,SSM的Filter,Servlet,Listener,Interceptor的实现