使用spring+struts2无法注入bean对象,求救！

配置web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 

	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

	<welcome-file-list>

		<welcome-file>index.jsp</welcome-file>

	</welcome-file-list>



	<listener>

		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

	</listener>



	<context-param>

		<param-name>contextConfigLocation</param-name>

		<param-value>classpath:application.xml</param-value>

	</context-param>



	<filter>

		<filter-name>struts2</filter-name>

		<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

	</filter>



	<filter-mapping>

		<filter-name>struts2</filter-name>

		<url-pattern>/*</url-pattern>

	</filter-mapping>

</web-app>

application.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:context="http://www.springframework.org/schema/context"

	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

	xsi:schemaLocation="http://www.springframework.org/schema/beans

           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-2.5.xsd

           http://www.springframework.org/schema/aop

           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd

           http://www.springframework.org/schema/tx 

           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

	<import resource="com/common/commonContext.xml"/>

       <bean id="optLoggerBean" 

	 	class="com.common.OptLoggerBean">

	 </bean>

	 <bean id="exceptionLogger" 

	 	class="com.common.ExceptionLogger">

	 </bean>

	 <aop:config>

		<aop:pointcut id="actionPoint" 

			expression="within(com.*.action..*)"/>

		<aop:aspect id="optLoggerAspect" 

			ref="optLoggerBean">

			<aop:around pointcut-ref="actionPoint"

				method="logger"/>

		</aop:aspect>

		

		<aop:aspect id="exceptionAspect" 

				ref="exceptionLogger">

			<aop:after-throwing 

				pointcut-ref="actionPoint"

				method="logger"

				throwing="e"/>

		</aop:aspect>

	</aop:config>

	<bean id="stuDao" class="com.huangcf.dao.impl.StudentDaoImpl">

		<property name="dataSource" ref="dataSource" />

	</bean>	

	<bean id="ser" class="com.huangcf.service.impl.StudentServiceImpl">

		<property name="dao" ref="stuDao"></property>

		<property name="transactionTemplate" ref="transactionTemplate" />

	</bean>



	<bean id="studentAction" class="com.huangcf.action.StudentAction"

		scope="prototype">

		<property name="ser" ref="ser"></property>

		<property name="username">  

            <value type="java.lang.String">admin</value>  

        </property>

		<property name="password">  

            <value type="java.lang.String">admin</value>  

        </property>  

	</bean>

</beans>

commonContext.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"  

    xsi:schemaLocation="http://www.springframework.org/schema/beans    

http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> 

	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">

              <property name="driverClassName">

                     <value>oracle.jdbc.driver.OracleDriver</value>

              </property>

              <property name="url">

                     <value>jdbc:oracle:thin:@localhost:1521:ORCL</value>

              </property>

              <property name="username">

                     <value>system</value>

              </property>

              <property name="password">

                     <value>Aa123456</value>

              </property>

              <property name="maxActive">

                     <value>255</value>

              </property>

              <property name="maxIdle">

                     <value>2</value>

              </property>

              <property name="maxWait">

                     <value>120000</value>

              </property>

       </bean>

       

    <bean id="template" class="org.springframework.jdbc.core.JdbcTemplate">

		<property name="dataSource" ref="dataSource" />

	</bean>



	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

		<property name="dataSource" ref="dataSource" />

	</bean>

	

	<bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">

		<property name="transactionManager" ref="transactionManager" />

	</bean>    

	<!--

	<bean id="jdbctTxManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  

    	<property name="dataSource" ref="dataSource" >

    	</property>  

	</bean>

	<bean

		id="JdbcBasicTxProxy" abstract="true"

		class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

		<description>数据库事务代理</description>

		<property name="transactionManager" ref="jdbctTxManager"/>

		<property name="transactionAttributes">

			<props>

				<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>

			</props>

		</property>

	</bean>

	<bean

		id="BasicJdbcDAO" abstract="true"

		class="org.springframework.jdbc.core.support.JdbcDaoSupport">

		<description>JdbcDAO</description>

		<property name="dataSource" ref="dataSource"/>

	</bean>	--> 

</beans>

action代码：

package com.huangcf.action;



import com.common.BaseAction;

import com.huangcf.entity.Student;

import com.huangcf.service.StudentService;



public class StudentAction extends BaseAction {



	public String username;

	public String password;

	private StudentService ser;



	@Override

	public String execute(){

		try{

			Student student = new Student();

			student.setUsername(username);

			student.setPassword(password);

			ser.login(student);

		}catch(Exception e){

			e.printStackTrace();

			logger.error(e);

		}

		return SUCCESS;

	}



	public String getUsername() {

		return username;

	}



	public void setUsername(String username) {

		this.username = username;

	}



	public String getPassword() {

		return password;

}

	public void setPassword(String password) {

		this.password = password;

	}



	public StudentService getSer() {

		return ser;

	}



	public void setSer(StudentService ser) {

		this.ser = ser;

	}

}

service代码：

package com.huangcf.service.impl;



import org.springframework.transaction.TransactionStatus;

import org.springframework.transaction.support.TransactionCallback;

import org.springframework.transaction.support.TransactionTemplate;



import com.huangcf.dao.StudentDao;

import com.huangcf.entity.Student;

import com.huangcf.service.StudentService;



public class StudentServiceImpl implements StudentService {

	

	private StudentDao dao;

	private TransactionTemplate transactionTemplate;

	

	public boolean login(final Student stu) {

		transactionTemplate.execute(new TransactionCallback() {

			@Override

			public Object doInTransaction(TransactionStatus arg0) {

				boolean b = dao.login(stu);

				System.out.println(b);

				return b;

				//throw new RuntimeException("抛出异常，在transactionTemplate中回调的事务将会回滚");

			}

		});

		return false;

	}



	public StudentDao getDao() {

		return dao;

	}



	public void setDao(StudentDao dao) {

		this.dao = dao;

	}



	public TransactionTemplate getTransactionTemplate() {

		return transactionTemplate;

	}



	public void setTransactionTemplate(TransactionTemplate transactionTemplate) {

		this.transactionTemplate = transactionTemplate;

	}

}

dao代码：

package com.huangcf.dao.impl;



import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Types;

import java.util.List;



import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowMapper;



import com.common.BaseDAO;

import com.huangcf.dao.StudentDao;

import com.huangcf.entity.Student;



public class StudentDaoImpl extends BaseDAO implements StudentDao {

	public boolean login(Student stu) {

		String sql = "select login_name username,password password from  tb_user where login_name = 'admin' and password = 'admin'";

		Student item = queryForObject(sql, Student.class);

		if(item == null){

			return false;

		}

		return true;

	}

}

调用action时报空指针，说service为空username、password也是null，原因在哪？