Java过滤器Filter详解

public class AFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("输出filter2的init方法");
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        System.out.println("输出filter2的doFilter方法之前");
        filterChain.doFilter(request, response);
        System.out.println("输出filter2的doFilter方法之后");
    }
    @Override
    public void destroy() {
        System.out.println("输出filter2的destroy方法");
    }
}

public class BFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("输出filter1的init方法");
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        System.out.println("输出filter1的doFilter方法之前");
        filterChain.doFilter(request, response);
        System.out.println("输出filter1的doFilter方法之后");
    }
    @Override
    public void destroy() {
        System.out.println("输出filter1的destroy方法");
    }
}

@Configuration
public class WebConfig {
    @Bean
    public FilterRegistrationBean filter1() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        AFilter aFilter = new AFilter();
        filterRegistrationBean.setFilter(aFilter);
        filterRegistrationBean.setOrder(1);
        return filterRegistrationBean;
    }
    @Bean
    public FilterRegistrationBean filter2() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        BFilter bFilter = new BFilter();
        filterRegistrationBean.setFilter(bFilter);
        filterRegistrationBean.setOrder(2);
        return filterRegistrationBean;
    }
}