1、登錄成功的時傳一個session存放用戶物件
HttpSession session = requst.getSession();
session.setAttribute(Constant.USER_IN_SESSION, user);
2、判斷用戶的登錄狀態，獲取session，若session為空，則表示用戶沒有登錄過，攔截用戶跳轉到登錄界面，若為true，則表示用戶已經登錄，給用戶放行
public class UserInterceptor implements HandlerInterceptor {
@Override
public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
// TODO Auto-generated method stub
}
@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
throws Exception {
// TODO Auto-generated method stub
}
@Override
public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object arg2) throws Exception {
//獲取到session
Object object = req.getSession().getAttribute(Constant.USER_IN_SESSION);
if (object == null) {
resp.sendRedirect("/system/login");
return false;
} else {
return true;
}
}
}
3.配置攔截器
<mvc:interceptors>
<mvc:interceptor>
<!-- 攔截的路徑 /*只能攔截一層 /a /b -->
<mvc:mapping path="/system/**"/>
<!-- 不攔截的路徑 -->
<mvc:exclude-mapping path="/system/login"/>
<!-- 自己定義的攔截器位置 -->
<bean class="com.srd.cds.UserInterceptor"></bean>
</mvc:interceptor>
</mvc:interceptors>
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