SpringBoot-web综合

Posted 2021-01-31 swpCode

1. 自定义Filter

   public class MyFilter implements Filter {
   
       @Override
       public void init(FilterConfig filterConfig) throws ServletException {
           System.out.println("filter init");
       }
   
       @Override
       public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
           HttpServletRequest request = (HttpServletRequest) servletRequest;
           String uri = request.getRequestURI();
           System.out.println("filter uri : " + uri);
           filterChain.doFilter(servletRequest,servletResponse);
       }
   
       @Override
       public void destroy() {
           System.out.println("filter destroy");
       }
   }
   

    

2. 自定义Listener

   /**
    * 描述:
    * 1.ServletContextListener -- 监听servletContext对象的创建以及销毁
    * 2.HttpSessionListener  -- 监听session对象的创建以及销毁
    * 3.ServletRequestListener -- 监听request对象的创建以及销毁
    * 4.ServletContextAttributeListener  -- 监听servletContext对象中属性的改变
    * 5.HttpSessionAttributeListener  --监听session对象中属性的改变
    * 6.ServletRequestAttributeListener  --监听request对象中属性的改变
    * @outhor ios
    * @create 2019-01-03 3:00 PM
    */
   public class MyListener implements ServletRequestListener {
   
       @Override
       public void requestDestroyed(ServletRequestEvent sre) {
           System.out.println("---------------------------->请求销毁");
       }
   
       @Override
       public void requestInitialized(ServletRequestEvent sre) {
           System.out.println("---------------------------->请求创建");
       }
   }
   

    

3. 自定义interceptor

   public class MyInterceptor implements HandlerInterceptor {
   
       @Override
       public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
           System.out.println("拦截器 -- 请求处理之前");
           return false;
       }
   
       @Override
       public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
           System.out.println("拦截器 -- 请求处理之后，视图渲染之前");
       }
   
       @Override
       public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
           System.out.println("拦截器 -- 请求处理之后，视图渲染之后");
       }
   }
   

    

4. 注册自定义的Filter，Listener，Intercetor

   @Configuration
   public class WebConfig implements WebMvcConfigurer {
   
       @Bean
       public FilterRegistrationBean filterRegistrationBean(){
           FilterRegistrationBean bean = new FilterRegistrationBean();
           bean.setFilter(new MyFilter());
           bean.setName("MyFilter");
           bean.addUrlPatterns("/*");
           return bean;
       }
   
       @Bean
       public ServletListenerRegistrationBean listenerRegistrationBean(){
           ServletListenerRegistrationBean bean = new ServletListenerRegistrationBean();
           bean.setListener(new MyListener());
           return bean;
       }
   
       @Override
       public void addInterceptors(InterceptorRegistry registry) {
           registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
       }
   }