struts2 spring 无法注入 bean,该怎么处理

struts2 spring 无法注入 bean
注册的aciton 文件  该文件的regiestserviceimpl属性始终为null  spring文件明明已经配置了 注入该属性

package action;
import service.Regiestservice;
import domain.Users;
public class regiest  {

	private Users users;
         private Regiestservice regiestserviceimpl;

    
	public Users getUsers() {
		return users;
	}

	public void setUsers(Users users) {
		this.users = users;
	}


	public void setRegiestserviceimpl(Regiestservice regiestserviceimpl) {
		this.regiestserviceimpl = regiestserviceimpl;
	}

	public String regiestaction()
	{
		System.out.println(regiestserviceimpl);
		return "success";
	}
	
	
}

dao实现层文件 无用代码删了 就一个注册 保存用户数据的方法

package daoimpl;

import java.util.List;
import java.util.Set;
import org.hibernate.LockMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import dao.UsersDAO;
import domain.Users;
public class UsersDAOimpl extends HibernateDaoSupport implements UsersDAO {
	private static final Logger log = LoggerFactory.getLogger(UsersDAOimpl.class);
	protected void initDao() {	}

		public void save(Users transientInstance) {
		log.debug("saving Users instance");
		try {
			getHibernateTemplate().save(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	
	public static UsersDAO getFromApplicationContext(ApplicationContext ctx) {
		return (UsersDAO) ctx.getBean("UsersDAO");
	}
}

业务层实现 

package serviceimpl;


import service.Regiestservice;
import dao.UsersDAO;
import daoimpl.UsersDAOimpl;
import domain.Users;

public class Regiestserviceimpl implements Regiestservice {

	private UsersDAO usersDAO;

	public UsersDAO getUsersDAO() {
		return usersDAO;
	}

	public void setUsersDAO(UsersDAO usersDAO) {
		this.usersDAO = usersDAO;
	}

	public boolean regiest(Users user)
	{
		usersDAO.save(user);
                  return true;		
		
	}
	
}

spring的配置文件 applicationcontext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">


	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver">
		</property>
		<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:sky">
		</property>
		<property name="username" value="shop"></property>
		<property name="password" value="shop"></property>
	</bean>
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource">
			<ref bean="dataSource" />
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.Oracle9Dialect
				</prop>
			</props>
		</property>
		<property name="mappingResources">
			<list>
				<value>domain/Users.hbm.xml</value>
				<value>domain/Dishes.hbm.xml</value>
				<value>domain/Orders.hbm.xml</value>
				<value>domain/Detail.hbm.xml</value>
			</list>
		</property>
	</bean>
	<bean id="UsersDAO" class="daoimpl.UsersDAOimpl">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>
		
	<bean id="serviceregiest" class="serviceimpl.Regiestserviceimpl">
		<property name="usersDAO">
			<ref bean="UsersDAO" />
		</property>
	</bean>

	<bean id="actionregiest" class="action.regiest">
		<property name="regiestserviceimpl">
			<ref bean="serviceregiest" />
		</property>
	</bean>

</beans>