SpringBoot使用过滤器filter的两种方式

1.创建filter包，并创建MyFilter类

@WebFilter(urlPatterns = "/MyFilter")
public class MyFilter implements Filter {
    @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);
    }
}

2.启动入口类进行扫描注解添加

@ServletComponentScan(basePackages = "com.bjpowernode.springboot.filter")

1.创建过滤器

public class MyFilter implements Filter {
    @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);
    }
}

2.创建过滤器配置类

@Configuration  //声明此类为配置类
public class FilterConfig {

    @Bean
    public FilterRegistrationBean myFilterRegistrationBean(){
        //注册过滤器
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new MyFilter());
        //添加过滤器路径
        filterRegistrationBean.addUrlPatterns("/user/*");
        return filterRegistrationBean;
    }
}