sessionfilter.java

JavaEE订餐项目的功能：用户登录、用户注册、添加订餐信息、查询订餐、结算、权限验证

package com.amaker.filter;

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.HttpSession;

import com.amaker.bean.SystemMember;

public class SessionFilter implements Filter {

	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		
		HttpServletRequest hsr = (HttpServletRequest)request;
		
		HttpSession session = hsr.getSession();
		
		SystemMember m = (SystemMember) session.getAttribute("SystemMember");
		
		if(m!=null){
			chain.doFilter(request, response);
		}else{
			hsr.getRequestDispatcher("/login.jsp").forward(request, response);
		}

	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}