struts2自定义拦截器

 

package com.interceptot;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;


public class LoginInterceptor extends AbstractInterceptor {

	@Override
	public String intercept(ActionInvocation invocation) throws Exception {

		// 取得请求相关的ActionContext实例
		String user=(String)ActionContext.getContext.getSession().get("user");

		// 如果没有登陆，都返回重新登陆

		if (user != null && user.equals("")) {
			return invocation.invoke();
		}
                ActionContext.put("message", "你还没有登录");
		return LOGIN;

	}

}

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
	"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<package name="authority" extends="struts-default">
	
		<!-- 定义一个拦截器 -->
		<interceptors>
			<interceptor name="authority"
				class="com.LoginInterceptor">
			</interceptor>
			<!-- 拦截器栈 -->
			<interceptor-stack name="mydefault">
				<interceptor-ref name="defaultStack" />
				<interceptor-ref name="authority" />
			</interceptor-stack>
		</interceptors>
              <defalut-interceptor-ref name="mydefault" />
		<!-- 定义全局Result -->
		<global-results>
			<!-- 当返回login视图名时，转入/login.jsp页面 -->
			<result name="login">/login.jsp</result>
		</global-results>

		<action name="loginform"
			class="com.LoginFormAction">
			<result name="success">/login.jsp</result>
		</action>
		
		<action name="login" class="com.LoginAction">
			<result name="success">/welcome.jsp</result>
			<result name="error">/login.jsp</result>
			<result name="input">/login.jsp</result>
		</action>

		<action name="show" class="com.ShowAction">
			<result name="success">/show.jsp</result>
			<!-- 使用此拦截器 -->
			<interceptor-ref name="mydefault" />
		</action>
		
	</package>
</struts>