SpringBoot通过代码注册Servlet、Fillter、Listener

Spring Boot提供了 ServletRegistrationBean，FilterRegistrationBean，ServletListenerRegistrationBean这3个东西来进行配置Servlet、Filter、Listener。

通过自定义配置文件WebConfig.java注册Servlet、Filter、Listener。

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1. import java.util.ArrayList;  
2. import java.util.EventListener;  
3. import java.util.List;  
4.    
5. import org.springframework.boot.context.embedded.FilterRegistrationBean;  
6. import org.springframework.boot.context.embedded.ServletListenerRegistrationBean;  
7. import org.springframework.boot.context.embedded.ServletRegistrationBean;  
8. import org.springframework.context.annotation.Bean;  
9. import org.springframework.context.annotation.Configuration;  
10. import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;  
11.    
12. import com.tianshouzhi.springbootstudy.web.filter.DemoFilter;  
13. import com.tianshouzhi.springbootstudy.web.listener.DemoListener;  
14. import com.tianshouzhi.springbootstudy.web.servlet.DemoServlet;  
15.    
16. @Configuration  
17. public class WebConfig extends WebMvcConfigurerAdapter{  
18.     @Bean  
19.     public FilterRegistrationBean getDemoFilter(){  
20.         DemoFilter demoFilter = new DemoFilter();  
21.         FilterRegistrationBean registrationBean = new FilterRegistrationBean();  
22.         registrationBean.setFilter(demoFilter);  
23.         List<String> urlPatterns = new ArrayList<String>();  
24.         urlPatterns.add("/*");//拦截路径，可以添加多个  
25.         registrationBean.setUrlPatterns(urlPatterns);  
26.         registrationBean.setOrder(1);  
27.         return registrationBean;  
28.     }  
29.     @Bean  
30.     public ServletRegistrationBean getDemoServlet(){  
31.         DemoServlet demoServlet = new DemoServlet();  
32.         ServletRegistrationBean registrationBean = new ServletRegistrationBean();  
33.         registrationBean.setServlet(demoServlet);  
34.         List<String> urlMappings=new ArrayList<String>();  
35.         urlMappings.add("/demoservlet");////访问，可以添加多个  
36.         registrationBean.setUrlMappings(urlMappings);  
37.         registrationBean.setLoadOnStartup(1);  
38.         return registrationBean;  
39.     }  
40.     @Bean  
41.     public ServletListenerRegistrationBean<EventListener> getDemoListener(){  
42.         ServletListenerRegistrationBean<EventListener> registrationBean = new ServletListenerRegistrationBean<>();  
43.         registrationBean.setListener(new DemoListener());  
44.         //registrationBean.setOrder(1);  
45.         return registrationBean;  
46.     }