Filter（过滤）

	<filter>
		<filter-name>ContinuingEducationSystemFilter</filter-name>
		<filter-class>com.springmvchibernate.ContinuingEducation.filters.ContinuingEducationSystemFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>ContinuingEducationSystemFilter</filter-name>
		<url-pattern>/view/ContinuingEducationSystem/*</url-pattern>
	</filter-mapping>

 

   <filter-mapping></filter-mapping>可以指定多个目录 

 

 

package com.springmvchibernate.ContinuingEducation.filters;

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.springmvchibernate.ContinuingEducation.log.Logger;

public class ContinuingEducationSystemFilter implements Filter {
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException,
			NullPointerException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		if (session.getAttribute("adminuser") != null) {
			chain.doFilter(request, response);
		}else{
			Logger.audit("越权访问者转发到后台登录界面");
			res.sendRedirect("/view/ContinuingEducationLogin/login.jsp");
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
		Logger.audit("系统初始化,SystemFilter已启用,管理员:Tenstar@解明超!");
	}

	public void destroy() {
		Logger.audit("系统session销毁");
	}
}

 

 

只有adminuser用户才可以访问/view/ContinuingEducationSystem/路径下的文件其他用户被过滤掉