如何在嵌入式tomcat中配置阀门？

import org.apache.catalina.Context;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.startup.Tomcat;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class EmbeddedTomcatExample {
    public static void main(String[] args) throws LifecycleException {
        Tomcat tomcat = new Tomcat();
        tomcat.setPort(8080);

        // 创建一个Context对象
        Context context = tomcat.addContext("/", null);

        // 添加阀门到Context对象
        context.addFilter("MyFilter", new MyFilter());
        context.addFilterMapping("MyFilter", "/*");

        // 将Context对象添加到Host对象
        tomcat.getHost().addChild(context);

        tomcat.start();
        tomcat.getServer().await();
    }

    public static class MyFilter implements Filter {
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            // 初始化操作
        }

        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
            HttpServletRequest httpRequest = (HttpServletRequest) request;
            HttpServletResponse httpResponse = (HttpServletResponse) response;

            // 在这里处理请求和响应

            chain.doFilter(request, response);
        }

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