http://www.jt.com/user/logout.html 我需要拦截:.html，然后访问：www.jt.com/user/logout路径，应该怎么操作

你可以使用URL重写（URL Rewriting）技术来实现这个功能。具体实现方法如下：

1. 在web.xml文件中配置一个Filter，用于拦截以.html结尾的请求：

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

2. 编写UrlRewriteFilter类，实现doFilter方法：

public class UrlRewriteFilter implements Filter {
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        String path = httpRequest.getRequestURI().substring(httpRequest.getContextPath().length());
        if (path.endsWith(".html")) {
            String newPath = path.substring(0, path.length() - 5);
            RequestDispatcher dispatcher = request.getRequestDispatcher(newPath);
            dispatcher.forward(request, response);
        } else {
            chain.doFilter(request, response);
        }
    }
    // 其他方法
}

3. 在web.xml文件中配置一个servlet-mapping，将"/user/logout"路径映射到LogoutServlet：

<servlet>
    <servlet-name>logoutServlet</servlet-name>
    <servlet-class>com.example.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>logoutServlet</servlet-name>
    <url-pattern>/user/logout</url-pattern>
</servlet-mapping>

4. 编写LogoutServlet类，处理"/user/logout"路径的请求：

public class LogoutServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 处理登出逻辑
        // ...
        response.sendRedirect("http://www.jt.com/user/logout.html");
    }
    // 其他方法
}

这样，当用户访问"http://www.jt.com/user/logout.html"时，UrlRewriteFilter会拦截请求并将其转发到"/user/logout"路径，然后LogoutServlet会处理该路径的请求并执行相应的逻辑，最后将用户重定向回"http://www.jt.com/user/logout.html"页面。