authenticationfilter.java

本人大学时大型作业用JAVA做的一个 BBS系统 模式MVC 非struts版 开发工具JCreator Pro 数据库SQL2

package filters;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import domain.*;
public class AuthenticationFilter implements Filter
{
	private FilterConfig filterConfig;
	public void init(FilterConfig filterConfig) throws ServletException
	{
		this.filterConfig = filterConfig;
	}	
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException
	{
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)res;		
		if (request.getSession().getAttribute("user") == null)
		{			
			RequestDispatcher dispatcher = filterConfig.
			getServletContext().getRequestDispatcher("/jsp/bbsLogin.jsp");
			dispatcher.forward(request, response);
		}
		else
		{		
			chain.doFilter(request, response);
		}
	}
	public void destroy()
	{
	}
}