SpringBoot项目配置过滤器Filter

方式一：

1. 自定义过滤器实现Filter接口

   public class MyFilter implements Filter {
       
       @Override
       public void init(FilterConfig filterConfig) throws ServletException {
           System.out.println("-----------------init-----------------");
       }
   
       @Override
       public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
           System.out.println("-----------------doFilter1-----------------");
           chain.doFilter(request,response);
           System.out.println("-----------------doFilter2-----------------");
       }
   
       @Override
       public void destroy() {
           System.out.println("-----------------destroy-----------------");
       }
   }
   

2. 注册自定义过滤器

   @Configuration
   public class MyFilterConfig {
   
       @Bean
       public FilterRegistrationBean<MyFilter> filterRegistrationBean(){
   
           FilterRegistrationBean<MyFilter> filterRegistrationBean = new FilterRegistrationBean<>();
           filterRegistrationBean.setFilter(new MyFilter());	//设置自定义过滤器
           filterRegistrationBean.addUrlPatterns("/*");	//添加过滤路径
   //  	filterRegistrationBean.setOrder(0);		//设置优先级，数值越低优先级越高
           return filterRegistrationBean;
   
       }
   
   }
   

方式二：

1. 自定义过滤器：

   //@Order(0)		//设置优先级，数值越低优先级越高
   @WebFilter(filterName = "myFilter", urlPatterns = "/*")	//过滤路径
   public class MyFilter implements Filter {
   
       @Override
       public void init(FilterConfig filterConfig) throws ServletException {
           System.out.println("-----------------init-----------------");
       }
   
       @Override
       public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
           System.out.println("-----------------doFilter1-----------------");
           chain.doFilter(request,response);
           System.out.println("-----------------doFilter2-----------------");
       }
   
       @Override
       public void destroy() {
           System.out.println("-----------------destroy-----------------");
       }
   }
   

2. 在入口函数类上添加注解@ServletComponentScan：

   @SpringBootApplication
   @ServletComponentScan
   public class DemoApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(DemoApplication.class, args);
       }
   
   }