Spring 自动装配无法工作

Spring autowired can not work

我目前正在使用 Spring Data Neo4j 开发应用程序。这是我第一次使用Spring框架。

但是,自动装配注解不起作用,我总是得到 null。这是代码:

    public class CreateDiaryTransaction extends Transaction {
    @Autowired
    DirayRepository repository;

    @Override
    public Object perform(Map<String, Object> parameters) {
        // TODO Auto-generated method stub
        Diary diary = (Diary) DiaryFactory.getInstance().create(parameters);
        repository.save(diary);
        return diary.toJsonRepre();
    }
}

然后我在单元测试中测试它:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({ "/applicationContext.xml" })
public class CreateDiaryTransactionTest {

    @Test
    public void test() {
        Transaction transaction = new CreateDiaryTransaction();
        Map<String, Object> parameters = new HashMap<>();
        parameters.put("title", "Test");
        parameters.put("weather", "sun");
        parameters.put("mood", "happy");
        parameters.put("html", "<a href=\"javascript:void(0)\">link</a>");
        parameters.put("images", new ArrayList<Image>());
        try {
            transaction.execute(parameters);
        } catch (Exception e) {
            fail("Exception occur");
        }
    }
}

当我运行它时,我得到了空对象异常。但是,当我将存储库直接放在单元测试中时,它工作正常。这是另一个有效的测试:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({ "/applicationContext.xml" })
public class DiaryRepositoryTest {
    @Autowired
    DirayRepository repository;

    @Test
    @Transactional
    public void testSaveDiary() {
        Diary diary = (Diary) DiaryFactory.getInstance().create(
                new HashMap<String, Object>());
        repository.save(diary);

        Diary retrivedDiary = repository.findOne(diary.getGraphId());
        assertEquals(diary, retrivedDiary);
    }

}

这是我的应用程序上下文:

<context:annotation-config />
<neo4j:config storeDirectory="target/data/pamela"
    base-package="com.bond.pamela.domain" />
<neo4j:repositories base-package="com.bond.pamela.persistence" />
<tx:annotation-driven mode="aspectj" />

<bean id="conversionService"
    class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <bean
                class="com.bond.pamela.domain.valueObject.converter.ImageToJsonConverter" />
            <bean
                class="com.bond.pamela.domain.valueObject.converter.JsonToImageConverter" />
        </set>
    </property>
</bean>

我想我以某种方式将存储库放在了 spring 上下文之外,但是我怎样才能得到它呢?谢谢

您需要在您的应用程序上下文中关注

<context:component-scan base-package="packagename.package" />

这里的包名是你所有的 类 都带有注释的包。

看看这个 post 了解更多:

Spring MVC: Difference between context:annotation-config vs context:component-scan

确保你已经在 DirayRepository 的实现上写了 @Repository@Component 注释并且你已经写了 component-scan applicationContext.xml

DirayRepository

的示例代码
@Repository
  public class DirayRepositoryImpl implements DirayRepository {
   void save() { ...}

  }