攔截JSP頁面，校驗是否已登錄詳解及實現代碼

攔截JSP頁面，校驗是否已登錄

最近使用struts2做項目，需要攔截JSP以校驗是否已經登，但struts2的過濾器鏈只能過濾action。後來發現在web.xml裡可以直接增加javax.servlet.Filter實現類的過濾器，可以過濾JSP。請看代碼

Filter實現類

<span style="font-size:18px;">package com.common; 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.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class LoginFilter extends HttpServlet implements Filter { private static final long serialVersionUID = 1L; @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest)request; HttpServletResponse res = (HttpServletResponse)response; String path = req.getContextPath(); String indexPath = req.getScheme()+"://"+req.getServerName()+":"+req.getServerPort()+path+ "/pages/login.jsp"; if(req.getRequestURI().endsWith("login.jsp")) { chain.doFilter(request, response); return; } Object loginuser = req.getSession().getAttribute("<strong><span style="color:#ff0000;">loginSession</span></strong>"); if(loginuser == null){ res.sendRedirect(indexPath); return; } chain.doFilter(request, response); } @Override public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } } </span>

登錄方法：

 <span style="font-size:18px;"> public String login() { Login login = new Login(); //.......校驗登錄信息ActionContext ctx = ActionContext.getContext(); Map<String, Object> session = ctx.getSession(); session.put("<strong><span style="color:#ff0000;">loginSession</span></strong>", login); return "success"; }</span>

web.xml配置

<filter> <filter-name>setlog</filter-name> <filter-class>com.common.LoginFilter</filter-class> </filter> <filter-mapping> <filter-name>setlog</filter-name> <url-pattern>/pages/home.jsp</url-pattern> <url-pattern>/pages/channel/*</url-pattern> <url-pattern>/pages/content/*</url-pattern> <url-pattern>/pages/product/*</url-pattern> <url-pattern>/pages/vodtask/*</url-pattern> </filter-mapping>

注意，如果頁面上使用了框架，則可能導致session超時後退出到登錄頁面，此時登錄頁面顯示在框架的某個子頁面，解決方法，在登錄頁面加入如下代碼即可。

 <span style="font-size: 18px;"> <script language="javascript"> if (top != window) top.location.href = window.location.href; </script></span>

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