方案一:
web.xml配置文件拦截范围缩小 ,没有必要 /*的配置拦截项目下所有资源。
<filter> <filter-name>Login</filter-name> <filter-class>com.ssm.crm.filter.LoginFilter</filter-class> </filter> <filter-mapping> <filter-name>Login</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
修改如下:
<filter> <filter-name>Login</filter-name> <filter-class>com.ssm.crm.filter.LoginFilter</filter-class> </filter> <filter-mapping> <filter-name>Login</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> <filter-mapping> <filter-name>Login</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <filter-mapping> <filter-name>Login</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping>
进一步优化 :把所有的页面无需拦截的文件(jsp,html,ftl,css等放在同一个文件夹下;需要拦截的请求公有路径也统一)拦截是配置为:
<filter-mapping> <filter-name>Login</filter-name> <url-pattern>/文件夹名字/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>Login</filter-name> <url-pattern>/需要拦截的请求公有路径/*</url-pattern> </filter-mapping>
方案二:
过滤掉js,css等相关文件
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse res = (HttpServletResponse)response; HttpSession session = req.getSession(); LoginUser loginUser = (LoginUser) session.getAttribute("loginUser"); String spath = req.getServletPath(); System.out.println("request.getContextPath()"+req.getContextPath()); //不需要过滤的url String[] urls = {"/login","/json",".js",".css",".ico",".jpg",".png"}; boolean flag = true; for (String str : urls) { if (spath.indexOf(str) != -1) { flag =false; break; } } if (flag) { if (loginUser != null) { chain.doFilter(request, response); }else { res.sendRedirect(req.getContextPath()+"/webpage/page/login/login.jsp"); } }else{ chain.doFilter(request, response); } }