如何在Java中使用Servlet过滤器来更改传入的Servlet请求网址？

如何使用Servlet过滤器更改来自的传入Servlet请求网址

http://nm-java.appspot.com/Check_License/Dir_My_App/Dir_ABC/My_Obj_123

至

http://nm-java.appspot.com/Check_License?Contact_Id=My_Obj_123

？

更新：根据BalusC的以下步骤，我想到了以下代码：

public class UrlRewriteFilter implements Filter {

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

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest) req;
        String requestURI = request.getRequestURI();

        if (requestURI.startsWith("/Check_License/Dir_My_App/")) {
            String toReplace = requestURI.substring(requestURI.indexOf("/Dir_My_App"), requestURI.lastIndexOf("/") + 1);
            String newURI = requestURI.replace(toReplace, "?Contact_Id=");
            req.getRequestDispatcher(newURI).forward(req, res);
        } else {
            chain.doFilter(req, res);
        }
    }

    @Override
    public void destroy() {
        //
    }
}

相关条目web.xml如下所示：

<filter>
    <filter-name>urlRewriteFilter</filter-name>
    <filter-class>com.example.UrlRewriteFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>urlRewriteFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

我尝试了服务器端和客户端重定向，均获得了预期的结果。它成功了，谢谢BalusC！