UserLoginInterceptor 拦截器类（千万不要写成abstract类，开始我就写成这样了就是加载不上去）
package com.hyl.inter;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.hyl.action.UserInfoAction;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class UserLoginInterceptor implements Interceptor {
public void destroy() {
System.out.println("我是登录拦截器销毁");
}
public void init() {
System.out.println("我是登录验证拦截器初始化");
}
public String intercept(ActionInvocation invocation) throws Exception {
System.out.println("我正在进行登录拦截功能");
String result = "";
// 判断当前要调用的Action实例（对象） 是否是 登录验证的Action
if (invocation.getAction() instanceof UserInfoAction) {
result = invocation.invoke();
} else {
//当前要调用的不是登录的Action
//从session中取值，判断是否是空（登录）
//登录的Action中将登录用户信息存储到session中,key值是当前的sessionID
HttpServletRequest request = ServletActionContext.getRequest();
Map session = invocation.getInvocationContext().getSession();
if (session.get(request.getSession().getId()) != null) {
result = invocation.invoke();
} else {
//session中如果不存在就跳到登录页面
return "error";
}
}
return result;
}
}
Struts配置文件内容
<?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="userInfo" namespace="/userInfo" extends="struts-default">
<interceptors>
<interceptor name="userInter" class="com.hyl.inter.UserLoginInterceptor"></interceptor>
<interceptor-stack name="myStack">
<!--加载Struts默认拦截器-->
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="userInter"></interceptor-ref>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="myStack"></default-interceptor-ref>
<action name="*userInfoMan" class="com.hyl.action.UserInfoAction" method="{1}">
<result name="success1" type="redirect">/menu.jsp</result>
<result name="error" type="redirect">/user_login.jsp</result>
</action>
</package>
</struts>