判断是否登录的拦截器CheckLoginFilter

来源：互联网发布：python telnet expect 编辑：程序博客网时间：2024/06/05 18:11
import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.util.List;import java.util.ArrayList;import java.util.StringTokenizer;import java.io.IOException;/**     * 用于检测用户是否登陆的过滤器，如果未登录，则重定向到指的登录页面      * 配置参数     * checkSessionKey 需检查的在 Session 中保存的关键字      * redirectURL 如果用户未登录，则重定向到指定的页面，URL不包括 ContextPath      * notCheckURLList 不做检查的URL列表，以分号分开，并且 URL 中不包括 ContextPath     */public class CheckLoginFilter implements Filter {protected FilterConfig filterConfig = null;private String redirectURL = null;private List notCheckURLList = new ArrayList();private String sessionKey = null;public void doFilter(ServletRequest servletRequest,ServletResponse servletResponse, FilterChain filterChain)throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) servletRequest;HttpServletResponse response = (HttpServletResponse) servletResponse;HttpSession session = request.getSession();if (sessionKey == null) {filterChain.doFilter(request, response);return;}if ((!checkRequestURIIntNotFilterList(request))&& session.getAttribute(sessionKey) == null) {response.sendRedirect(request.getContextPath() + redirectURL);return;}filterChain.doFilter(servletRequest, servletResponse);}public void destroy() {notCheckURLList.clear();}private boolean checkRequestURIIntNotFilterList(HttpServletRequest request) {String uri = request.getServletPath()+ (request.getPathInfo() == null ? "" : request.getPathInfo());return notCheckURLList.contains(uri);}public void init(FilterConfig filterConfig) throws ServletException {this.filterConfig = filterConfig;redirectURL = filterConfig.getInitParameter("redirectURL");sessionKey = filterConfig.getInitParameter("checkSessionKey");String notCheckURLListStr = filterConfig.getInitParameter("notCheckURLList");if (notCheckURLListStr != null) {StringTokenizer st = new StringTokenizer(notCheckURLListStr, ";");notCheckURLList.clear();while (st.hasMoreTokens()) {notCheckURLList.add(st.nextToken());}}}}
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