UserAction中通过@Autowired注入UserServiceImpl无效，得到对象为空

UserAction.java

@Namespace("/")

@ParentPackage("struts-default")

@Controller

public class UserAction extends ActionSupport implements ModelDriven {

private User user = new User();

public User getModel() {

return this.user;

}

// *****************************

@Autowired

private UserService userService;

@Action(value = "userAction_add", results = { @Result(name = "add", location = "/success.jsp") })

public String add() {

this.userService.saveUser(user);

return "add";

}

}

UserServiceImpl.java

@Service

public class UserServiceImpl implements UserService {

@Autowired

private UserDao userDao;

@Transactional

public void saveUser(User user) {

this.userDao.save(user);

}

@Transactional

public void updateUser(User user) {

this.userDao.update(user);

}

@Transactional

public void deleteUser(User user) {

this.userDao.delete(user);

}

@Transactional(readOnly = true)

public User findUserById(Integer id) {

return this.userDao.findById(id);

}

@Transactional(readOnly = true)

public List findAllUser() {

return this.userDao.findAll();

}

}

配置文件

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

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

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

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

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

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

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

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

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

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

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

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

class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">

org.hibernate.dialect.MySQL5Dialect

true

true

update

none

thread

com.entity

class="org.springframework.orm.hibernate5.HibernateTransactionManager">