Java 至少需要1个符合autowire候选资格的bean。依赖项注释

我正在使用基于java的配置。我有以下显示错误的代码设置

public class MyWebInitializer implements WebApplicationInitializer {
    public static Logger logger = Logger.getLogger(MyWebInitializer.class);

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        logger.info("initializing web context");
        AnnotationConfigWebApplicationContext annotationConfigWebApplicationContext = new AnnotationConfigWebApplicationContext();

        annotationConfigWebApplicationContext.register(FrontController.class);

        ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcher",
                new DispatcherServlet(annotationConfigWebApplicationContext));

        dispatcher.setLoadOnStartup(1);
        dispatcher.addMapping("/");

        logger.info("On start up method complete");
    }

}

前控制器设置：

@Configuration
@EnableWebMvc
@ComponentScan("com.ishwor.crm.controller,com.ishwor.crm.entity,com.ishwor.crm.DAO")
@PropertySource("classpath:hibenrate.properties")
@EnableTransactionManagement
public class FrontController implements WebMvcConfigurer {
    public static Logger logger = Logger.getLogger(FrontController.class);

    @Autowired
    Environment environment;

    @Bean
    InternalResourceViewResolver internalResourceViewResolver() {
        logger.info("inside view resolver function ");
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        logger.info("View Resolving complete ");
        return resolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        logger.info("Inside static resource handler");
        // for css and js
        registry.addResourceHandler("/resources/**").addResourceLocations("/WEB-INF/resources/")
                .setCacheControl(CacheControl.maxAge(2, TimeUnit.HOURS).cachePublic());
        logger.info("static resource handling complete");
    }

    // hibernate configuration
    @Bean(name = "sessionFactory")
    public LocalSessionFactoryBean sessionBean() {
        logger.info("Creating sesion bean");
        LocalSessionFactoryBean bean = new LocalSessionFactoryBean();

        bean.setDataSource(dataSource());
        bean.setPackagesToScan(
                new String[] { "com.ishwor.crm.entity", "com.ishwor.crm.DAO", "com.ishwor.crm.DAOImpl" });
        bean.setHibernateProperties(hibernateProperties());
        logger.info("Creating sesion bean=== successfull!!!");
        return bean;
    }

    @Bean
    public DataSource dataSource() {

        logger.info("Datasource method invoked");

        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
        dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
        dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
        dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));

        logger.info("DataSource Invoke complete");

        return dataSource;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        logger.info("setting properties for hibernated");
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("hibernate.hbm2ddl.auto"));
        logger.info("setting properties completed");
        return properties;
    }

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

}

 package com.ishwor.crm.controller;
    
    import java.util.List;
    
    import org.apache.log4j.Logger;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import com.ishwor.crm.DAO.CustomerDAO;
    import com.ishwor.crm.entity.Customer;
    
    @Controller()
    @RequestMapping("/customer")
    public class CustomerController {
    
        public static Logger logger = Logger.getLogger(CustomerController.class);
    
        // Autowired customerDAO
        @Autowired
        private CustomerDAO customerDAO;
        
        
        @RequestMapping("/list")
        public String customerHome(Model model) {
            logger.info("customer index metho browsed");
    
            List<Customer> customer = customerDAO.getCustomer();
            
            model.addAttribute("customer", customer);
    
            return "/customer/index";
        }
    }

实体Setp：

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "customer")
public class Customer {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private long id;

    @Column(name = "first_name")
    private String firstName;

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "email")
    private String email;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Customer() {

    }

    public Customer(String firstName, String lastName, String email) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    @Override
    public String toString() {
        return "Customer [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
    }

}

DAO设置：

package com.ishwor.crm.DAO;

import java.util.List;

import com.ishwor.crm.entity.Customer;

public interface CustomerDAO {
    public List<Customer> getCustomer();

}

package com.ishwor.crm.DAO；
导入java.util.List；
导入com.ishwor.crm.entity.Customer；
公共接口客户道{
公共列表getCustomer（）；
}

DAOImpl设置

  package com.ishwor.crm.DAOImpl;
    
    import java.util.List;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.query.Query;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Qualifier;
    import org.springframework.stereotype.Repository;
    import org.springframework.transaction.annotation.Transactional;
    
    import com.ishwor.crm.DAO.CustomerDAO;
    import com.ishwor.crm.entity.Customer;
    
    @Repository
    public class CustomerDAOImpl implements CustomerDAO {
        @Autowired
        @Qualifier("sessionFactory")
        private SessionFactory sessionFactory;
    
        public CustomerDAOImpl() {
    
        }
    
        @Override
        @Transactional
        public List<Customer> getCustomer() {
            // get current hibernate Session
            Session currenSession = sessionFactory.getCurrentSession();
            // create Query
            Query<Customer> myQuery = currenSession.createQuery("from customer", Customer.class);
            // execute query and get result
    
            return myQuery.getResultList();
        }
    }

package com.ishwor.crm.DAOImpl；
导入java.util.List；
导入org.hibernate.Session；
导入org.hibernate.SessionFactory；
导入org.hibernate.query.query；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.beans.factory.annotation.Qualifier；
导入org.springframework.stereotype.Repository；
导入org.springframework.transaction.annotation.Transactional；
导入com.ishwor.crm.DAO.CustomerDAO；
导入com.ishwor.crm.entity.Customer；
@存储库
公共类CustomerDAOImpl实现CustomerDAO{
@自动连线
@限定符（“会话工厂”）
私人会话工厂会话工厂；
公共客户DaoImpl（）{
}
@凌驾
@交易的
公共列表getCustomer（）{
//获取当前休眠会话
会话currenSession=sessionFactory.getCurrentSession（）；
//创建查询
Query myQuery=currenSession.createQuery（“来自客户”，customer.class）；
//执行查询并获取结果
返回myQuery.getResultList（）；
}
}

但使用此DAO作为自动连线显示错误，我有以下customerController设置：

@Configuration
@EnableWebMvc
@ComponentScan("com.ishwor.crm.controller,com.ishwor.crm.entity,com.ishwor.crm.DAO")
@PropertySource("classpath:hibenrate.properties")
@EnableTransactionManagement
public class FrontController implements WebMvcConfigurer {
    public static Logger logger = Logger.getLogger(FrontController.class);

    @Autowired
    Environment environment;

    @Bean
    InternalResourceViewResolver internalResourceViewResolver() {
        logger.info("inside view resolver function ");
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        logger.info("View Resolving complete ");
        return resolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        logger.info("Inside static resource handler");
        // for css and js
        registry.addResourceHandler("/resources/**").addResourceLocations("/WEB-INF/resources/")
                .setCacheControl(CacheControl.maxAge(2, TimeUnit.HOURS).cachePublic());
        logger.info("static resource handling complete");
    }

    // hibernate configuration
    @Bean(name = "sessionFactory")
    public LocalSessionFactoryBean sessionBean() {
        logger.info("Creating sesion bean");
        LocalSessionFactoryBean bean = new LocalSessionFactoryBean();

        bean.setDataSource(dataSource());
        bean.setPackagesToScan(
                new String[] { "com.ishwor.crm.entity", "com.ishwor.crm.DAO", "com.ishwor.crm.DAOImpl" });
        bean.setHibernateProperties(hibernateProperties());
        logger.info("Creating sesion bean=== successfull!!!");
        return bean;
    }

    @Bean
    public DataSource dataSource() {

        logger.info("Datasource method invoked");

        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
        dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
        dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
        dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));

        logger.info("DataSource Invoke complete");

        return dataSource;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        logger.info("setting properties for hibernated");
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("hibernate.hbm2ddl.auto"));
        logger.info("setting properties completed");
        return properties;
    }

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

}

 package com.ishwor.crm.controller;
    
    import java.util.List;
    
    import org.apache.log4j.Logger;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import com.ishwor.crm.DAO.CustomerDAO;
    import com.ishwor.crm.entity.Customer;
    
    @Controller()
    @RequestMapping("/customer")
    public class CustomerController {
    
        public static Logger logger = Logger.getLogger(CustomerController.class);
    
        // Autowired customerDAO
        @Autowired
        private CustomerDAO customerDAO;
        
        
        @RequestMapping("/list")
        public String customerHome(Model model) {
            logger.info("customer index metho browsed");
    
            List<Customer> customer = customerDAO.getCustomer();
            
            model.addAttribute("customer", customer);
    
            return "/customer/index";
        }
    }

package com.ishwor.crm.controller；
导入java.util.List；
导入org.apache.log4j.Logger；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.stereotype.Controller；
导入org.springframework.ui.Model；
导入org.springframework.web.bind.annotation.RequestMapping；
导入com.ishwor.crm.DAO.CustomerDAO；
导入com.ishwor.crm.entity.Customer；
@控制器（）
@请求映射（“/customer”）
公共类客户控制器{
publicstaticlogger=Logger.getLogger（CustomerController.class）；
//自动连线客户道
@自动连线
私人客户道客户道；
@请求映射（“/list”）
公共字符串customerHome（模型）{
logger.info（“浏览的客户索引方法”）；
List customer=customerDAO.getCustomer（）；
model.addAttribute（“客户”，客户）；
返回“/客户/索引”；
}
}

注意没有控制器类代码上的自动接线，工作正常。

---

为了完成这项工作，我是否应该使用@service注释并使用另一个类和接口。

我认为Spring默认按名称自动连接。您需要将控制器的局部变量重命名为“…Impl”，或者需要覆盖Impl类的默认名称。

看起来您的customerDaoImpl没有被spring扫描以进行注释处理。检查您的配置，@Autowired将根据bean的类型自动解析。因此，自动连接是正确的，它是您的联合配置，不扫描@Repository注释，也不创建它的bean要扫描多个包，请使用如下字符串数组：

@ComponentScan({"com.ishwor.crm.controller","com.ishwor.crm.entity","com.ishwor.crm.DAO"})

---

是的，当你需要缓存数据时，你应该尝试@Service类，最好是最后一个缓存服务类中的数据，而不是列表@Repository@Service@Controller。如果你正确使用它们，这3个是专门的@Component，也称为3层架构。如果你的项目规模很大，那么它将对你有很大帮助。业务逻辑应该在服务类中。

扫描组件失败

在代码中的

@ComponentScan

中添加

com.ishwor.crm.DAOImpl

包：

@ComponentScan("com.ishwor.crm.controller,com.ishwor.crm.entity,com.ishwor.crm.DAO,com.ishwor.crm.DAOImpl")

将

CustomerDAOImpl

替换为

CustomerDAO

中的

CustomerDAO

。它会起作用的

@Autowired
private CustomerDAO customerDAO;

---

谢谢你的回复。我尝试了这两种方法，但都不起作用，仍然是相同的错误。现在我正在使用这个

@ComponentScan（“com.ishwor.crm.controller，com.ishwor.crm.entity，com.ishwor.crm.DAO，com.ishwor.crm.daimpl”）

现在的错误代码是'Bean named'customerDAOImpl'应该是'com.ishwor.crm.DAOImpl.customerDAOImpl'类型，但实际上是'com.sun.proxy.$Proxy130'`现在我正在使用这个

@ComponentScan（{“com.ishwor.crm.controller，com.ishwor.crm.entity，com.ishwor.crm.DAOImpl，com.ishwor.crm.DAOImpl”））

现在就使用它：

@ComponentScan（{“com.ishwor.crm.controller，com.ishwor.crm.entity，com.ishwor.crm.DAO，com.ishwor.crm.DAOImpl”}）

错误代码为：

名为“customerDAOImpl”的Bean应为“com.ishwor.crm.DAOImpl.customerDAOImpl”类型，但实际为“com.sun.proxy.$Proxy165”类型。

请在问题中添加异常日志。