Java 没有可用类型的合格bean：至少需要1个符合autowire候选条件的bean

我有一个像这样的Hibernate配置设置

    @Configuration
@PropertySource("classpath:db.properties")
@ComponentScan("com.fyt.fyt")
@EnableTransactionManagement
public class ApplicationContextConfig {

    @Autowired
    private Environment env;

    @Bean()
    public InternalResourceViewResolver getViewResolver() {
        InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
        internalResourceViewResolver.setPrefix("/WEB-INF/views/");
        internalResourceViewResolver.setSuffix(".jsp");
        return internalResourceViewResolver;
    }

    @Bean()
    public DataSource getDataSource() {
        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setDriverClassName(env.getProperty("db.driver"));
        dataSource.setUrl(env.getProperty("db.url"));
        dataSource.setUsername(env.getProperty("db.username"));
        dataSource.setPassword(env.getProperty("db.password"));
        return dataSource;
    }

    @Autowired
    @Bean()
    public LocalSessionFactoryBean getSessionFactory() {

        LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();
        factoryBean.setDataSource(getDataSource());

        Properties props = new Properties();
        props.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
        props.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));

        factoryBean.setHibernateProperties(props);
        factoryBean.setAnnotatedClasses(User.class);
        return factoryBean;

    }
    @Autowired
    @Bean()
    public HibernateTransactionManager getTransactionManager() {
        HibernateTransactionManager transactionManager = new HibernateTransactionManager();
        transactionManager.setSessionFactory(getSessionFactory().getObject());
        return transactionManager;
    }

    @Autowired
    @Bean()
    public UserDao getUserDao(SessionFactory sessionFactory) {
        return new UserDaoImpl(sessionFactory);
    }
}

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserDao userDao;

    @Transactional
    @Override
    public List<User> list() {

        return userDao.list();
    }

    @Transactional
    @Override
    public User getUser(int id) {

        return userDao.getUser(id);
    }

    @Transactional
    @Override
    public void saveOrUpdate(User user) {
        userDao.saveOrUpdate(user);

    }

    @Transactional
    @Override
    public void delete(int id) {
        userDao.delete(id);

    }

}

@Repository
public class UserDaoImpl implements UserDao{
    @Autowired
    private SessionFactory sessionFactory;

    public UserDaoImpl() {

    }

    public UserDaoImpl(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public List<User> list() {
        List<User> users = (List<User>)sessionFactory.getCurrentSession().createCriteria(User.class)
                .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY).list();
        return users;
    }

    @Override
    public User getUser(int id) {
        String hql = "from tbl_user where id="+id;
        Query query = sessionFactory.getCurrentSession().createQuery(hql);
        List<User> users = (List<User>)query.list();
        if(!users.isEmpty() && users != null) {
        return users.get(0);
        }
        return null;
    }

    @Override
    public void saveOrUpdate(User user) {
        sessionFactory.getCurrentSession().saveOrUpdate(user);

    }

    @Override
    public void delete(int id) {
        User usertodelete = new User();
        usertodelete.setId(id);
        sessionFactory.getCurrentSession().delete(usertodelete);
    }

}

我有这样的userserviceinpl.java

    @Configuration
@PropertySource("classpath:db.properties")
@ComponentScan("com.fyt.fyt")
@EnableTransactionManagement
public class ApplicationContextConfig {

    @Autowired
    private Environment env;

    @Bean()
    public InternalResourceViewResolver getViewResolver() {
        InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
        internalResourceViewResolver.setPrefix("/WEB-INF/views/");
        internalResourceViewResolver.setSuffix(".jsp");
        return internalResourceViewResolver;
    }

    @Bean()
    public DataSource getDataSource() {
        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setDriverClassName(env.getProperty("db.driver"));
        dataSource.setUrl(env.getProperty("db.url"));
        dataSource.setUsername(env.getProperty("db.username"));
        dataSource.setPassword(env.getProperty("db.password"));
        return dataSource;
    }

    @Autowired
    @Bean()
    public LocalSessionFactoryBean getSessionFactory() {

        LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();
        factoryBean.setDataSource(getDataSource());

        Properties props = new Properties();
        props.put("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
        props.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));

        factoryBean.setHibernateProperties(props);
        factoryBean.setAnnotatedClasses(User.class);
        return factoryBean;

    }
    @Autowired
    @Bean()
    public HibernateTransactionManager getTransactionManager() {
        HibernateTransactionManager transactionManager = new HibernateTransactionManager();
        transactionManager.setSessionFactory(getSessionFactory().getObject());
        return transactionManager;
    }

    @Autowired
    @Bean()
    public UserDao getUserDao(SessionFactory sessionFactory) {
        return new UserDaoImpl(sessionFactory);
    }
}

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserDao userDao;

    @Transactional
    @Override
    public List<User> list() {

        return userDao.list();
    }

    @Transactional
    @Override
    public User getUser(int id) {

        return userDao.getUser(id);
    }

    @Transactional
    @Override
    public void saveOrUpdate(User user) {
        userDao.saveOrUpdate(user);

    }

    @Transactional
    @Override
    public void delete(int id) {
        userDao.delete(id);

    }

}

@Repository
public class UserDaoImpl implements UserDao{
    @Autowired
    private SessionFactory sessionFactory;

    public UserDaoImpl() {

    }

    public UserDaoImpl(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public List<User> list() {
        List<User> users = (List<User>)sessionFactory.getCurrentSession().createCriteria(User.class)
                .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY).list();
        return users;
    }

    @Override
    public User getUser(int id) {
        String hql = "from tbl_user where id="+id;
        Query query = sessionFactory.getCurrentSession().createQuery(hql);
        List<User> users = (List<User>)query.list();
        if(!users.isEmpty() && users != null) {
        return users.get(0);
        }
        return null;
    }

    @Override
    public void saveOrUpdate(User user) {
        sessionFactory.getCurrentSession().saveOrUpdate(user);

    }

    @Override
    public void delete(int id) {
        User usertodelete = new User();
        usertodelete.setId(id);
        sessionFactory.getCurrentSession().delete(usertodelete);
    }

}

我在UserDaoImpl中定义@Repository，在UserServiceImpl中定义@Serice，我也在做组件扫描，像这样@ComponentScan（“com.fyt.fyt”）“com.fyt.fyt”是根级别的包，但我仍然得到了这个错误。我做错了什么？

• 解决方案1：重命名方法

  getUserDao（）

  必须是

  userDao（）

• 解决方案2：将HomeController中的限定符更改为

  @qualifier（value=getUserDao）

• 解决方案3：删除限定符（预期只有1个限定符）

  UserDao

  在应用程序中）

---

用

@Bean

注释的方法的名称成为Bean的名称。因此，当前bean名为“getUserDao”，而您正试图在HomeController中自动连接名为“userDao”的bean，HomeController在哪里？它在同一个包com.fyt.fyts中。您的userDao接口由多个类实现？添加spring上下文。你使用组件扫描吗？我已经更新了代码，请检查一下。