filter.java

超市进销存系统,采用mvc+DAO模式编写

package mybaobao;

import java.io.IOException;

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;

public class Filter implements javax.servlet.Filter {

	public void destroy() {
		
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {

			try
			{
				request.setCharacterEncoding("GB2312");	//统一编码
				chain.doFilter(request,response);
			}
			catch (Exception e)
			{
			}
		/*	
			
			//以下查看用户是否登录
			HttpServletRequest req = (HttpServletRequest)request ;
			HttpSession session = req.getSession() ;
			// 如果session不为空，则可以浏览其他页面
			if(session.getAttribute("name")!=null)
			{
				chain.doFilter(request,response);
			}
			else
			{
				// 通过requestDispatcher跳转到登陆页
				request.getRequestDispatcher("index.jsp").forward(request,response);
			}
		*/	
	}


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

	}

}