loginfilter.java

用jdbc写的一个存储过程的代码

package com.bluedot.web.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.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.bluedot.common.Constants;
import com.bluedot.domain.User;

public class LoginFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		// 判断是否登录？通过获取session中user对象，不存在返回login.jsp
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		HttpSession session = request.getSession();

		String uri = request.getRequestURI();

		if (uri.endsWith("login.jsp") || uri.endsWith("Login.do")) {
			chain.doFilter(req, resp);
		} else {
			User user = (User) session
					.getAttribute(Constants.USER_LOGIN_SESSION_KEY);
			if (user == null || "".equals(user.getLoginName())) {
				response.sendRedirect("login.jsp");
			} else {
				chain.doFilter(req, resp);
			}
		}
	}

	public void init(FilterConfig arg0) throws ServletException {

	}

}