<filter>

		<filter-name>BackEndFilter</filter-name>

		<filter-class>com.sun.BackFilter</filter-class>

	</filter>

	<filter-mapping>

		<filter-name>BackFilter</filter-name>

		<url-pattern>/backend/issues/*</url-pattern>

		<url-pattern>/backend/repairmen/*</url-pattern>

		<url-pattern>/backend/payment/*</url-pattern>

	</filter-mapping>

package com.xyt.backend;

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;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import com.xyt.common.Logging;

import com.xyt.common.RedisClient;

import com.xyt.jdbc.entity.Admin;

/**

 * 后台管理系统登录拦截器

 */

public class BackFilter implements Filter {

	@Override

	public void init(FilterConfig filterConfig) throws ServletException {

		//useless

	}

	@Override

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

			throws IOException, ServletException {

		HttpSession sess = ((HttpServletRequest)request).getSession();

		String ad = sess.getAttribute("admin");

		if(ad==null ){

			((HttpServletResponse)response).sendRedirect(((HttpServletRequest)request).getContextPath()+"//login");

		}else{

			chain.doFilter(request, response);

		}

	}

	@Override

	public void destroy() {

		//useless

	}

}