如何通过实现自动连接接口

Question

我一直在谷歌搜索答案很长一段时间，但我确信我错过了一些可以将这一切融合在一起的东西。我只是不确定是什么。运行Spring服务器失败时出错：

    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.test.abc.sv.dao.TestDAO com.test.abc.sv.controller.TestController.testDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.test.abc.sv.dao.TestDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:293)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1186)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:109)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
    at com.test.abc.sv.SpringLaunch.main(SpringLaunch.java:26)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.test.abc.sv.dao.TestDAO com.test.abc.sv.controller.TestController.testDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.test.abc.sv.dao.TestDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:509)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:290)
    ... 16 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.test.abc.sv.dao.TestDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1118)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:967)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:862)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:481)
    ... 18 common frames omitted

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.test.abc.sv.dao.TestDAO com.test.abc.sv.controller.TestController.testDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.test.abc.sv.dao.TestDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:293)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1186)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:109)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
    at com.test.abc.sv.SpringLaunch.main(SpringLaunch.java:26)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.test.abc.sv.dao.TestDAO com.test.abc.sv.controller.TestController.testDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.test.abc.sv.dao.TestDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:509)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:290)
    ... 16 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.test.abc.sv.dao.TestDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1118)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:967)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:862)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:481)
    ... 18 more

所以我正在运行应用程序 SpringLaunch.class - com.test.abc.sv

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class SpringLaunch extends SpringBootServletInitializer{

public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
}

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(applicationClass);
}

private static Class<SpringLaunch> applicationClass = SpringLaunch.class;

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
        dataSource.setUrl("jdbc:oracle:thin:@(DESCRIPTION ="
                                            +"(LOAD_BALANCE=on)"
                                            +"(FAILOVER=on)"
                                            +"(ADDRESS=(PROTOCOL=tcp)(HOST=56.276.152.217)(PORT=1521))"
                                            +"(ADDRESS=(PROTOCOL=tcp)(HOST=56.276.152.218)(PORT=1521))"
                                            +"(CONNECT_DATA=(SERVICE_NAME=test.abc.com)))");
        dataSource.setUsername("DevUser");
        dataSource.setPassword("Credential");

        return dataSource;
    }

    @Bean
    public TestDAO testDAO() {
        return new TestDAOImpl(dataSource());
    }

}

TestController.class - com.test.abc.sv.controller

    @RestController
@RequestMapping("/test")
public class TestController{


    @Autowired
    TestDAO testDao;

    final static Logger logger = Logger.getLogger(TestController.class);

    @RequestMapping(value="/setup", method = RequestMethod.GET)
    public Message setupTest(@RequestParam(value="id", required=true) String testNumber) {
        String testMsg = new String(); 

        try{
            testMsg = testDao.prepDatabase(testNumber);
        }
        catch(SQLException e)
        {
            //Log e.getMessage();
            logger.error(e.getMessage());
            System.out.println(e.getMessage());
            return new Message("-1");
        }

        return new Message(testMsg);
    }

    @RequestMapping(value="/teardown", method = RequestMethod.GET)
    public Message teardownTest(@RequestParam(value="id", required=true) String testNumber) {
        String testMsg = new String(); 

        try{
            testMsg = testDao.removeTestData(testNumber);
        }
        catch(SQLException e)
        {
            //Log e.getMessage();
            logger.error(e.getMessage());
            System.out.println(e.getMessage());
            return new Message("-1");
        }

        return new Message(testMsg);
    }

}

TestDAO.class - com.test.abc.sv.dao界面

 public interface TestDAO {

    public String prepDatabase(String testNumber)
            throws SQLException;

    public String removeTestData(String testNumber)
            throws SQLException;

}

`TestDAOImpl.class - com.test.abc.sv.dao＆＃39;

    @Component
public class TestDAOImpl implements TestDAO{

    private Log log = LogFactory.getLog(TestDAOImpl.class);

    private JdbcTemplate jdbcTemplate;

    public TestDAOImpl(DataSource dataSource) {
        jdbcTemplate = new JdbcTemplate(dataSource);
    }

    @Override
    public String prepDatabase(String testNumber)
            throws SQLException {

        //Impl Stuff

    }

    @Override
    public String removeTestData(String testNumber)
            throws SQLException {

        //Impl Stuff
    } 

}

Answer 1

来自@ComponentScan的{​​{3}}：

  

如果未定义特定包，则将使用此批注从类的包中进行扫描。

根据您的问题，您的Application课程在com.test.abc.sv.controller个套餐中。因此，com.test.abc.sv.controller及其子包中的所有内容都将被扫描，但这不包括您的自定义配置或服务，因为它们不在com.test.abc.sv.controller的支持。

因此，解决方案是将Application类移至例如com.test.abc包，或明确定义要扫描的包为com.test.abc。

此外，我不确定您为什么使用该自定义配置类。您可以使用documentation配置数据源。

对于配置类中的DAO / service bean声明，这就是service和dao的@Service或@Repository注释分别适用的内容。所以我建议摆脱那些。如果不这样做，您很可能会得到另一个例外，因为您的bean将通过组件扫描注册一次，第二次从配置类注册，这将导致Spring Boot properties。