拦截JSP页面，校验是否已登录详解及实现代码
拦截JSP页面，校验是否已登录
最近使用struts2做项目，需要拦截JSP以校验是否已经登，但struts2的过滤器链只能过滤action。后来发现在web.xml里可以直接增加javax.servlet.Filter实现类的过滤器，可以过滤JSP。请看代码
Filter实现类
<spanstyle="font-size:18px;">packagecom.common;
importjava.io.IOException;
importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassLoginFilterextendsHttpServletimplementsFilter{
privatestaticfinallongserialVersionUID=1L;
@Override
publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,
FilterChainchain)throwsIOException,ServletException{
HttpServletRequestreq=(HttpServletRequest)request;
HttpServletResponseres=(HttpServletResponse)response;
Stringpath=req.getContextPath();
StringindexPath=req.getScheme()+"://"+req.getServerName()+":"+req.getServerPort()+path+"/pages/login.jsp";
if(req.getRequestURI().endsWith("login.jsp"))
{
chain.doFilter(request,response);
return;
}
Objectloginuser=req.getSession().getAttribute("<strong><spanstyle="color:#ff0000;">loginSession</span></strong>");
if(loginuser==null){
res.sendRedirect(indexPath);
return;
}
chain.doFilter(request,response);
}
@Override
publicvoidinit(FilterConfigarg0)throwsServletException{
//TODOAuto-generatedmethodstub
}
}
</span>
登录方法：
<spanstyle="font-size:18px;">publicStringlogin()
{
Loginlogin=newLogin();
//.......校验登录信息
ActionContextctx=ActionContext.getContext();
Map<String,Object>session=ctx.getSession();
session.put("<strong><spanstyle="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，如果页面上使用了框架，则可能导致session超时后退出到登录页面，此时登录页面显示在框架的某个子页面，解决方法，在登录页面加入如下代码即可。
<spanstyle="font-size:18px;"><scriptlanguage="javascript"> if(top!=window) top.location.href=window.location.href; </script></span>
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