自定义Filter禁止用户直接访问JSP页面

自定义Filter:

package gsxy.gswbm.util;
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;
public class MyFilterJsp implements Filter{
    public void init(FilterConfig config) throws ServletException{} //初始化过滤器
    public void destroy(){}//过滤器的生命周期结束


    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filter)
        throws IOException, ServletException{
        request.getRequestDispatcher("/login.html").forward(request, response);
    }
}

web.xml配置:

<filter>
    <filter-name>MyFilterJsp</filter-name>
    <filter-class>gsxy.gswbm.util.MyFilterJsp</filter-class>
</filter>
<filter-mapping>
    <filter-name>MyFilterJsp</filter-name>
    <url-pattern>*.jsp</url-pattern>
</filter-mapping>