写一个springmvc拦截器，用于拦截所有/jftzc/*，拦截到的请求需从请求头中获取参数uid，当uid=12345时放行，否则返回401.

实现类似下面的代码：

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Component
public class MyInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        String uid = request.getHeader("uid");
        if (uid == null || !uid.equals("12345")) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
            Exception ex) throws Exception {
    }
}

然后在Spring MVC配置文件中添加拦截器：

<mvc:interceptors>
    <bean class="com.example.MyInterceptor" />
</mvc:interceptors>

这样，所有以`/jftzc/`开头的请求都会被拦截，并检查请求头中的`uid`参数是否为`12345`。如果不是，返回401错误；否则，放行请求。