Spring Boot 使用 Filter 的正确姿势！

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import javax.servlet.*;
import java.io.IOException;
 
@SpringBootApplication
public class DemoApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
 
    @Bean
    public FilterRegistrationBean<DemoFilter> demoFilter() {
        FilterRegistrationBean<DemoFilter> registrationBean = new FilterRegistrationBean<>();
        registrationBean.setFilter(new DemoFilter());
        registrationBean.addUrlPatterns("/demo/*");
        registrationBean.setOrder(1);
        return registrationBean;
    }
 
    public static class DemoFilter implements Filter {
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            // 初始化代码
        }
 
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
                throws IOException, ServletException {
            // 在请求处理之前可以添加逻辑
            chain.doFilter(request, response);
            // 在请求处理之后可以添加逻辑
        }
 
        @Override
        public void destroy() {
            // 销毁代码
        }
    }
}

这段代码定义了一个名为DemoFilter的简单过滤器，并通过FilterRegistrationBean将其注册到Spring Boot应用的过滤器链中。过滤器会拦截以/demo/*开头的URL路径。这是在Spring Boot中配置和使用Filter的标准方式。