Java 没有类型为'的合格bean；com.example.repo.UserRepository'；可获得的

这是我第一次使用SpringMVC尝试SpringDataJPA，我无法解决这个错误

错误日志

严重：将上下文初始化事件发送到类org.springframework.web.context.ContextLoaderListener的侦听器实例时发生异常 org.springframework.beans.factory.UnsatifiedPendencyException:创建名为“mainController”的bean时出错：通过字段“userRepository”表示未满足的依赖关系；嵌套异常为org.springframework.beans.factory.NoSuchBeanDefinitionException:没有“com.example.repo.UserRepository”类型的合格bean可用：至少需要1个符合autowire候选条件的bean。依赖项注释：{@org.springframework.beans.factory.annotation.Autowired（required=true）} 位于org.springframework.beans.factory.annotation.AutoWiredNotationBeanPostProcessor$AutoWiredFeldElement.inject（AutoWiredNotationBeanPostProcessor.java:588） 位于org.springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:88） 位于org.springframework.beans.factory.annotation.AutoWiredNotationBeanPostProcessor.postProcessPropertyValues（AutoWiredNotationBeanPostProcessor.java:366） 位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1264） 位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:553） 位于org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:483） 位于org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject（AbstractBeanFactory.java:306） 位于org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230） 位于org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302） 位于org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197） 位于org.springframework.beans.factory.support.DefaultListableBeanFactory.PreInstanceSingleton（DefaultListableBeanFactory.java:761） 位于org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:866） 位于org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:542） 位于org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext（ContextLoader.java:444） 位于org.springframework.web.context.ContextLoader.initWebApplicationContext（ContextLoader.java:326） 位于org.springframework.web.context.ContextLoaderListener.contextInitialized（ContextLoaderListener.java:107） 位于org.apache.catalina.core.StandardContext.listenerStart（StandardContext.java:4725） 位于org.apache.catalina.core.StandardContext.startInternal（StandardContext.java:5189） 位于org.apache.catalina.util.LifecycleBase.start（LifecycleBase.java:150） 位于org.apache.catalina.core.ContainerBase$StartChild.call（ContainerBase.java:1419） 位于org.apache.catalina.core.ContainerBase$StartChild.call（ContainerBase.java:1409） 在java.util.concurrent.FutureTask.run（FutureTask.java:266）处 位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142） 位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:617） 运行（Thread.java:745） 原因：org.springframework.beans.factory.NoSuchBean定义异常：没有“com.example.repo.UserRepository”类型的合格bean可用：至少需要1个符合autowire候选条件的bean。依赖项注释：{@org.springframework.beans.factory.annotation.Autowired（required=true）} 位于org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound（DefaultListableBeanFactory.java:1486） 位于org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:1104） 位于org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:1066） 位于org.springframework.beans.factory.annotation.AutoWiredNotationBeanPostProcessor$AutoWiredFeldElement.inject（AutoWiredNotationBeanPostProcessor.java:585） ... 还有24个

UserRepository.java

 @Repository
 public interface UserRepository extends CrudRepository<User, Integer> {

 }

@Controller
@RequestMapping("/")
public class MainController {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping(value = "/user", method = RequestMethod.POST, headers = "Accept=application/json")
    @ResponseBody
    public ResponseEntity<User> addUser(@RequestBody User user) {
        userRepository.save(user);
        System.out.println("------>>>>>>>>>>" + user.getName());
        HttpHeaders headers = new HttpHeaders();
        return new ResponseEntity<User>(headers, HttpStatus.OK);
    }

    @RequestMapping(value = "/user/list", method = RequestMethod.GET)
    public ResponseEntity<List<User>> listAllUsers() {
        List<User> users = (List<User>)userRepository.findAll();
        if (users.isEmpty()) {
            System.out.println("List is empty oops..!!");
            return new ResponseEntity<List<User>>(HttpStatus.NO_CONTENT);
        }
        System.out.println("Got the List...!!");
        System.out.println("Name of First User---->>>>" + users.get(0).getName());
        return new ResponseEntity<List<User>>(users, HttpStatus.OK);
    }

}

@Configuration
@ComponentScan("com.example")
@EnableWebMvc
@EnableJpaRepositories
@EnableTransactionManagement
public class AppConfig {

    @Bean
    public InternalResourceViewResolver viewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();  
        resolver.setPrefix("/WEB-INF");  
        resolver.setSuffix(".html");
        return resolver;  
    }

    @Bean
    public DataSource dataSource(){
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/spring_database");
        dataSource.setUsername("root");
        dataSource.setPassword("");
        return dataSource;
    }

    @Bean
    public EntityManagerFactory entityManagerFactory(){
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setShowSql(true);
        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan(User.class.getPackage().getName());
        factory.setDataSource(dataSource());
        factory.afterPropertiesSet();
        return factory.getObject();
    }

    @Bean
    public PlatformTransactionManager transactionManager(){
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(entityManagerFactory());
        return txManager;
    }

}

@Entity
@Table(name="user")
public class User {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;
    private String name;
    private String email;
    /*Getters and Setters*/

User.java

 @Repository
 public interface UserRepository extends CrudRepository<User, Integer> {

 }

@Controller
@RequestMapping("/")
public class MainController {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping(value = "/user", method = RequestMethod.POST, headers = "Accept=application/json")
    @ResponseBody
    public ResponseEntity<User> addUser(@RequestBody User user) {
        userRepository.save(user);
        System.out.println("------>>>>>>>>>>" + user.getName());
        HttpHeaders headers = new HttpHeaders();
        return new ResponseEntity<User>(headers, HttpStatus.OK);
    }

    @RequestMapping(value = "/user/list", method = RequestMethod.GET)
    public ResponseEntity<List<User>> listAllUsers() {
        List<User> users = (List<User>)userRepository.findAll();
        if (users.isEmpty()) {
            System.out.println("List is empty oops..!!");
            return new ResponseEntity<List<User>>(HttpStatus.NO_CONTENT);
        }
        System.out.println("Got the List...!!");
        System.out.println("Name of First User---->>>>" + users.get(0).getName());
        return new ResponseEntity<List<User>>(users, HttpStatus.OK);
    }

}

@Configuration
@ComponentScan("com.example")
@EnableWebMvc
@EnableJpaRepositories
@EnableTransactionManagement
public class AppConfig {

    @Bean
    public InternalResourceViewResolver viewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();  
        resolver.setPrefix("/WEB-INF");  
        resolver.setSuffix(".html");
        return resolver;  
    }

    @Bean
    public DataSource dataSource(){
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/spring_database");
        dataSource.setUsername("root");
        dataSource.setPassword("");
        return dataSource;
    }

    @Bean
    public EntityManagerFactory entityManagerFactory(){
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setShowSql(true);
        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan(User.class.getPackage().getName());
        factory.setDataSource(dataSource());
        factory.afterPropertiesSet();
        return factory.getObject();
    }

    @Bean
    public PlatformTransactionManager transactionManager(){
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(entityManagerFactory());
        return txManager;
    }

}

@Entity
@Table(name="user")
public class User {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;
    private String name;
    private String email;
    /*Getters and Setters*/

这是我的项目结构

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我错过了什么？还是我的错在这里？有人能解决这个问题吗？

您需要告诉spring在哪里查找存储库：

---

@EnableJpaRepositories（basePackageClasses=UserRepository.class）

您需要告诉我们每个类的包。

@ComponentScan（“com.exampl”）

missing@JBNizet我已经附上了我的项目的形象structure@RC. 补充说，仍然得到相同的错误，我有同样的问题，作为迪尚。尝试过这个，但没有改变任何东西。