SpringBoot第一章过滤器

1、创建过滤器,注意：controller 、filter、config需要放置在application的子包下面，否则扫描不到，用于请求管道

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public class MyFilter implements Filter {       @Override     public void init(FilterConfig filterConfig) throws ServletException {         Filter.super.init(filterConfig);     }       @Override     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {           //servletResponse.getWriter().write("777");         System.out.println("拦截器拦截成功");         filterChain.doFilter(servletRequest,servletResponse);     }       @Override     public void destroy() {         Filter.super.destroy();     } }

　　

2、注解方式注册过滤器

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/**  * Servlet Filter implementation class MyFilter // */ //@WebFilter( //        dispatcherTypes = { //                DispatcherType.REQUEST, //                DispatcherType.FORWARD, //                DispatcherType.INCLUDE, //                DispatcherType.ERROR //        }, //        asyncSupported = true, //        description = "MyFilter器4", //        urlPatterns = {"/gg"}, //        initParams = { //                @WebInitParam(name = "name", value = "编程帮", description = "name的描述") //        }, //        servletNames = {"SuccessServlet"})

3、配置类FilterConfig注册，自动扫描自动注册

@Configuration
public class FilterConfig {

    @Bean
    public FilterRegistrationBean heFilterRegistration() {

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new MyFilter());

        filterRegistrationBean.addUrlPatterns("/*");

        return filterRegistrationBean;
    }
}