securityfilter.java

自己制作的联通CRM,支持客户分类,管理,升级,积分管理等等..

package com.filter;

import java.io.IOException;
import java.io.PrintWriter;

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;
/**
 * 判断是否登录
 * @author student
 *
 */
public class SecurityFilter implements Filter {

	public void destroy() {
		// TODO 自动生成方法存根

	}

	
	/**
	 * 过滤未登陆时先登陆、
	 * 无返回值
	 * 
	 * */
	public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest) arg0;
		HttpServletResponse res=(HttpServletResponse) arg1;
		HttpSession session=req.getSession();
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse respose = (HttpServletResponse) res;
		Object obj=session.getAttribute("userbean");
		if(obj==null)
		{
			respose.sendRedirect(request.getContextPath()+"/index.jsp");
		}else
		{
			arg2.doFilter(request, respose);
		}
		
		
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO 自动生成方法存根

	}

}