SpringBoot如何注册Servlet的三大组件

左手的ㄟ右手 2023-06-30 15:52 27阅读 0赞

# 手动注册自己的 #

## ServletRegistrationBean注册Servlet ##

写一个自己的MyServlet  
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@Configuration
    public class MyMvcConfig  extends WebMvcConfigurationSupport {
        
        //注册三大组件
        @Bean
        public ServletRegistrationBean myServlet(){
        
            ServletRegistrationBean registrationBean = new ServletRegistrationBean(new MyServlet(),"/myServlet");
            return registrationBean;
        }
    }

![在这里插入图片描述][20200118143619606.png]

## FilterRegistrationBean注册Filter ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 1]

@Configuration
    public class MyMvcConfig  extends WebMvcConfigurationSupport {
        
        @Bean
        public FilterRegistrationBean myFilter(){
        
            FilterRegistrationBean registrationBean = new FilterRegistrationBean();
            registrationBean.setFilter(new MyFilter());
            registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));
            return registrationBean;
        }
     }

## ServletListenerRegistrationBean注册listener ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 2]

@Configuration
    public class MyMvcConfig  extends WebMvcConfigurationSupport {
        
     	// 监听这个应用的所有请求
        public ServletListenerRegistrationBean myListener(){
        
            ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean<>(new MyListener());
            return registrationBean;
        }

# 自动注册的DIspatcherServlet #

SpringBoot帮我们自动SpringMVC的时候，自动的注册SpringMVC的前端控制器；DIspatcherServlet；

*  默认拦截： / 所有请求；包静态资源，但是不拦截jsp请求； /\*会拦截jsp
 *  可以通过server.servletPath来修改SpringMVC前端控制器默认拦截的请求路径  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 3]

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[20200118143619606.png]: https://img-blog.csdnimg.cn/20200118143619606.png
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