springboot中filter配置

在Spring Boot中配置Filter有两种方式：

1. 实现javax.servlet.Filter接口，使用注解@WebFilter，然后在Spring Boot的配置类中添加ServletRegistrationBean将Filter注册到Servlet容器中。

例如：

@WebFilter(urlPatterns = "/api/*")
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // 初始化操作
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 过滤操作
    }

    @Override
    public void destroy() {
        // 销毁操作
    }
}

@Configuration
public class WebConfig {
    @Bean
    public ServletRegistrationBean<MyFilter> myFilter() {
        ServletRegistrationBean<MyFilter> registrationBean = new ServletRegistrationBean<>();
        registrationBean.setFilter(new MyFilter());
        registrationBean.addUrlPatterns("/api/*");
        registrationBean.setName("MyFilter");
        registrationBean.setOrder(1);
        return registrationBean;
    }
}

2. 使用@Configuration注解的类，实现FilterRegistrationBean，将Filter注册到Servlet容器中。

例如：

@Configuration
public class WebConfig {
    @Bean
    public FilterRegistrationBean<MyFilter> myFilter() {
        FilterRegistrationBean<MyFilter> registrationBean = new FilterRegistrationBean<>();
        registrationBean.setFilter(new MyFilter());
        registrationBean.addUrlPatterns("/api/*");
        registrationBean.setName("MyFilter");
        registrationBean.setOrder(1);
        return registrationBean;
    }
}

上述两种方式都可以用来配置Filter，具体选哪种方式，可以根据实际情况进行选择。