Struts拦截器判断用户是否登陆

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package wge.learn.shop.interceptor;import org.apache.struts2.ServletActionContext;import wge.learn.shop.adminuser.vo.AdminUser;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;/** * 权限拦截器: * @author  * */public class PrivilegeInterceptor extends MethodFilterInterceptor{@Overrideprotected String doIntercept(ActionInvocation actionInvocation) throws Exception {// 判断是否登录,如果登录,放行,没有登录,跳转到登录页面.AdminUser adminUser = (AdminUser) ServletActionContext.getRequest().getSession().getAttribute("existAdminUser");if(adminUser != null){// 已经登录过return actionInvocation.invoke();}else{// 跳转到登录页面:ActionSupport support = (ActionSupport) actionInvocation.getAction();support.addActionError("您还没有登录!没有权限访问!");return ActionSupport.LOGIN;}}}

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