在Jetty中通过默认servlet提供静态资源

我的Servlet（在Jetty上运行）还应该部署静态目录中的静态内容。

目录结构：

/
  - static/
    - [static files]
  - WEB-INF/
    - [my servlet .class files and the web.xml]

我的web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">

    <filter>
        <filter-name>filter</filter-name>
        <filter-class>com.example.StaticFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

我的主要Servlet文件：

@WebServlet("/*")
public class SampleClass extends HttpServlet {
     //Code
}

而我的过滤器：

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class StaticFilter implements Filter {

    @Override
    public void init(FilterConfig fc) throws ServletException {
    }

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        String path = req.getRequestURI().substring(req.getContextPath().length());

        if (path.startsWith("/static")) {
            request.getRequestDispatcher(path).forward(request, response);
        } else {
            chain.doFilter(request, response);
        }
    }
}

现在，如果我调用/static/style.css，我想从/ static获取文件，而不是将其重定向到servlet。

服务器：Jetty 9.1.0 RC1