整合filter

springboot整合filter

整合filter方式一

1. 创建filter

   //整合filter方式一
   // @WebFilter(filterName = "FirstFilter",urlPatterns = {"*.do","*.jsp"})
   @WebFilter(filterName = "FirstFilter",urlPatterns = "/first")
   public class FirstFilter implements Filter {
   
       @Override
       public void init(FilterConfig filterConfig) throws ServletException {
   
       }
   
       @Override
       public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
           System.out.println("first filter");
           filterChain.doFilter(servletRequest,servletResponse);
           System.out.println("离开first filter");
       }
   
       @Override
       public void destroy() {
   
       }
   }
   

2. 修改启动类

   @SpringBootApplication
   @ServletComponentScan  //在springboot启动时扫描@WebServlet，@WebFilter注解，并将该类实例化
   public class SpringbootwebApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(SpringbootwebApplication.class, args);
       }
   
   }
   

整合filter方式二

1. 创建filter

   //整合filter方式二
   public class SecondFilter implements Filter {
       @Override
       public void init(FilterConfig filterConfig) throws ServletException {
   
       }
   
       @Override
       public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
           System.out.println("进入second filter");
           filterChain.doFilter(servletRequest,servletResponse);
           System.out.println("离开second filter");
       }
   
       @Override
       public void destroy() {
   
       }
   }
   

2. 编写配置类

   //filter配置类
   @Configuration
   public class FilterConfig {
       @Bean
       public FilterRegistrationBean getFilterRegistrationBean(){
           FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
           // bean.addUrlPatterns(new String[]{"*.do","*.jsp"});//通过后缀拦截
           bean.addUrlPatterns("/second");
           return bean;
       }
   }