loginfilter.java

本系统基本完善了CRM管理系统的各个模块

package com.accp.filter;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class LoginFilter extends HttpServlet implements Filter {
	private FilterConfig filterConfig;

	// Handle the passed-in FilterConfig
	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
	}

	// Process the request/response pair
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain filterChain) {
		try {
			HttpServletRequest request = (HttpServletRequest) req;
			HttpServletResponse response = (HttpServletResponse) resp;
			HttpSession sess = request.getSession();

			String page = request.getServletPath();
			if (!"/index.jsp".equals(page)) {
				// 当前访问的不是登录页面
				// 有没有登录过
				if (sess.getAttribute("userName") == null) {
					// 没有登录
					response.sendRedirect("index.jsp");
				}
			}
			filterChain.doFilter(req, resp);
		} catch (ServletException sx) {
			filterConfig.getServletContext().log(sx.getMessage());
		} catch (IOException iox) {
			filterConfig.getServletContext().log(iox.getMessage());
		}
	}

	// Clean up resources
	public void destroy() {
	}
}