struts2自定义拦截器的实现及使用

import org.apache.struts2.ServletActionContext;

import com.delicious.entity.Users;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
//检查用户是否登陆&&是不是管理员身份
//继承拦截器AbstractInterceptor抽象类或者实现Interceptor接口
 public class SecurityInterceptor extends AbstractInterceptor {

	private static final long serialVersionUID = 1L;

	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		Users user = (Users) ServletActionContext.getContext().getSession().get("user");
		if (user == null) {
			return "error";
		}else if (!user.getIsAdmin()) {
			return "error";
		}else {
			return invocation.invoke();
		}
		
	}

}


//struts.xml文件
//其中红色部分是对拦截器的配置
//粗体部分为拦截器的使用

<package name="admin" namespace="/admin" extends="struts-default">

		<interceptors>
			<interceptor name="security"
			class="com.delicious.interceptor.SecurityInterceptor"></interceptor>
			<interceptor-stack name="sshValueStack">
				<interceptor-ref name="security" />
				<interceptor-ref name="paramsPrepareParamsStack">
					<param name="alwaysInvokePrepare">false</param>
				</interceptor-ref>
			</interceptor-stack>
		</interceptors>

		<default-interceptor-ref name="sshValueStack"></default-interceptor-ref>

		<global-results>
			<result name="error" type="redirectAction">
				<param name="actionName">error</param>
				<param name="namespace">/</param>
			</result>
		</global-results>

		<action name="foods-*" class="adminFoodsAction" method="{1}">
			<interceptor-ref name="fileUpload">
				<param name="maximumSize ">10485760</param>
				<param name="allowedExtensions ">jpg,png,gif</param>
			</interceptor-ref>
			<interceptor-ref name="sshValueStack" />

			<result name="list">/admin/foods_list.jsp</result>
			<result name="save" type="redirectAction">foods-list</result>
			<result name="edit">/admin/foods_input.jsp</result>
			<result name="delete" type="redirectAction">foods-list</result>
			<result name="input" type="redirectAction">foods-list</result>
		</action>

		<action name="messages-*" class="adminMessagesAction" method="{1}">
			<result name="list">/admin/messages_list.jsp</result>
			<result name="*" type="redirectAction">messages-list</result>
		</action>

</package>