一种方法是实施
Filter

例如：

package package;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class FilterImplementation implements Filter
{
    public void init(FilterConfig filterConfig) throws ServletException {...}

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
    {
        // if you detect an illegal request, throw an exception or return without calling chain.doFilter.
        chain.doFilter(request, response);     
    }

    public void destroy() {...}
}

将以下内容添加到web.xml中：

<filter>
    <filter-name>MyFilter</filter-name>
    <filter-class>package.FilterImplementation</filter-class>
</filter>

<filter-mapping>
    <filter-name>MyFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

编辑

您需要了解的有关请求哪个页面的所有信息都在request参数中。ServletRequest但是，参数类型几乎总是为a，HttpServletRequest因此您可以执行以下操作：

if (request instanceof HttpServletRequest)
{
    HttpServletRequest hrequest = (HttpServletRequest) request;
    String uri = hrequest.getRequestURI(); // you should be able to just use this
    String uri = hrequest.getRequestURL(); // otherwise there are more in-depth fields
}