SpringBoot 过滤器、监听器、拦截器

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//注册器名称为customFilter,拦截的url为所有

@WebFilter(filterName="customFilter",urlPatterns={"/*"})

@Slf4j

public class CustomFilter implements Filter{

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

        log.info("filter 初始化");

    }

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

            throws IOException, ServletException {

        // TODO Auto-generated method stub

        log.info("doFilter 请求处理");

        //对request、response进行一些预处理

        // 比如设置请求编码

        // request.setCharacterEncoding("UTF-8");

        // response.setCharacterEncoding("UTF-8");

        //TODO 进行业务逻辑

        //链路 直接传给下一个过滤器

        chain.doFilter(request, response);

    }

    @Override

    public void destroy() {

        log.info("filter 销毁");

    }

}

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@SpringBootApplication

@ServletComponentScan

@Slf4j

public class Chapter7Application {

    public static void main(String[] args) {

        SpringApplication.run(Chapter7Application.class, args);

        log.info("chapter7 服务启动");

    }

}

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@Bean

    public FilterRegistrationBean  filterRegistrationBean() {

        FilterRegistrationBean registration = new FilterRegistrationBean();

        //当过滤器有注入其他bean类时，可直接通过@bean的方式进行实体类过滤器，这样不可自动注入过滤器使用的其他bean类。

        //当然，若无其他bean需要获取时，可直接new CustomFilter()，也可使用getBean的方式。

        registration.setFilter(customFilter());

        //过滤器名称

        registration.setName("customFilter");

        //拦截路径

        registration.addUrlPatterns("/*");

        //设置顺序

        registration.setOrder(10);

        return registration;

    }

    @Bean

    public Filter customFilter() {

        return new CustomFilter();

    }

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@WebListener

@Slf4j

public class Customlister implements ServletRequestListener{

    @Override

    public void requestDestroyed(ServletRequestEvent sre) {

        log.info("监听器：销毁");

    }

    @Override

    public void requestInitialized(ServletRequestEvent sre) {

        log.info("监听器：初始化");

    }

}

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@Slf4j

public class CustomHandlerInterceptor implements HandlerInterceptor{

    @Override

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)

            throws Exception {

        log.info("preHandle:请求前调用");

        //返回 false 则请求中断

        return true;

    }

    @Override

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,

            ModelAndView modelAndView) throws Exception {

        log.info("postHandle:请求后调用");

    }

    @Override

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

            throws Exception {

        log.info("afterCompletion:请求调用完成后回调方法，即在视图渲染完成后回调");

    }

}

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@Configuration

public class WebMvcConfigurer extends WebMvcConfigurerAdapter{

    @Override

     public void addInterceptors(InterceptorRegistry registry) {

         //注册拦截器 拦截规则

        //多个拦截器时 以此添加 执行顺序按添加顺序

        registry.addInterceptor(getHandlerInterceptor()).addPathPatterns("/*");

     }

    @Bean

    public static HandlerInterceptor getHandlerInterceptor() {

        return new CustomHandlerInterceptor();

    }

}