import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp2.BasicDataSource;
import org.hibernate.SessionFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBuilder;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@ComponentScan(basePackages={"com.app.maven.dto"})
@EnableTransactionManagement
public class UserConfig {
// Change the below based on the DBMS you choose
private final static String DATABASE_URL = "jdbc:mysql://localhost:3306/SpringMAVEN?createDatabaseIfNotExist=true";
private final static String DATABASE_DRIVER = "com.mysql.jdbc.Driver";
private final static String DATABASE_DIALECT = "org.hibernate.dialect.MySQLDialect";
private final static String DATABASE_USERNAME = "root";
private final static String DATABASE_PASSWORD = "root";
// dataSource bean will be available
@Bean
public DataSource getDataSource() {
BasicDataSource dataSource = new BasicDataSource();
// Providing the database connection information
dataSource.setDriverClassName(DATABASE_DRIVER);
dataSource.setUrl(DATABASE_URL);
dataSource.setUsername(DATABASE_USERNAME);
dataSource.setPassword(DATABASE_PASSWORD);
return dataSource;
}
// sessionFactory bean will be available
@Bean
public SessionFactory getSessionFactory(DataSource dataSource) {
LocalSessionFactoryBuilder builder = new LocalSessionFactoryBuilder(dataSource);
builder.addProperties(getHibernateProperties());
builder.scanPackages("com.app.maven.dto");
return builder.buildSessionFactory();
}
// All the hibernate properties will be returned in this method
private Properties getHibernateProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", DATABASE_DIALECT);
properties.put("hibernate.show_sql", "true");
properties.put("hibernate.format_sql", "true");
properties.put("hibernate.hbm2ddl.auto", "update");
return properties;
}
// transactionManager bean
@Bean
public HibernateTransactionManager getTransactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager transactionManager = new HibernateTransactionManager(sessionFactory);
return transactionManager;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns = "http://www.springframework.org/schema/beans"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns:context = "http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation = "http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<context:component-scan base-package="com.app.maven"></context:component-scan>
<mvc:resources location="/resources/" mapping="/resources/**"/>
<bean id="IRVR" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
@Controller
@RequestMapping("/")
public class UserController {
@Autowired
private UserService service;
@RequestMapping(value="/create",method=RequestMethod.POST)
public ModelAndView add(@ModelAttribute User user)
{
System.out.println("add controller");
service.add(user);
ModelAndView mv=new ModelAndView("views/sucess");
mv.addObject("info",user.getlName());
return mv;
}
}
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDAO userDAO;
public void add(User user) {
userDAO.add(user);
}
}
@Repository("userDAO")
@Transactional
public class UserDAOImpl implements UserDAO{
@Autowired
private SessionFactory sf;
public void add(User user) {
try {
sf.getCurrentSession().persist(user);
} catch (Exception e) {
e.printStackTrace();
}
}
}
遇到此错误
org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为'userController'的bean时出错：通过字段'service'表示的不满足的依赖关系；嵌套的异常是org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为“ userServiceImpl”的bean时出错：通过字段“ userDAO”表示的不满足的依赖关系；嵌套的异常是org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为'userDAO'的bean时出错：通过字段'sf'表示的不满足的依赖关系；嵌套的异常是org.springframework.beans.factory.BeanCreationException：在com.app.maven.config.UserConfig中定义名称为“ getSessionFactory”的bean创建时出错：通过工厂方法实例化Bean失败；嵌套的异常是org.springframework.beans.BeanInstantiationException：无法实例化[org.hibernate.SessionFactory]：工厂方法'getSessionFactory'引发了异常；嵌套的异常是java.lang.NullPointerException org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:587）
org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为'userServiceImpl'的bean时出错：通过字段'userDAO'表示的不满足的依赖关系；嵌套的异常是org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为'userDAO'的bean时出错：通过字段'sf'表示的不满足的依赖关系；嵌套的异常是org.springframework.beans.factory.BeanCreationException：在com.app.maven.config.UserConfig中定义名称为“ getSessionFactory”的bean创建时出错：通过工厂方法实例化Bean失败；嵌套的异常是org.springframework.beans.BeanInstantiationException：无法实例化[org.hibernate.SessionFactory]：工厂方法'getSessionFactory'引发了异常；嵌套的异常是java.lang.NullPointerException
答案 0 :(得分：1)
您错过了在UserDAO中实施UserDAOImpl