崛起于Springboot2.X之开发过滤器(20)

1、自定义过滤器

public class MyFilter 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("进入过滤器");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

2、注册过滤器

@Configuration
public class MyFilterConfig {

    @Bean
    public FilterRegistrationBean myFiletr(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new MyFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        return filterRegistrationBean;
    }
}

3、测试

运行，我们的过滤路径是/*，所以我们通过调用任何接口都可以在控制台出现我们要过滤的规则

开发过程中，根据需求定义过滤器或者拦截器