环境配置 2 注解

配置 jdbcConfig.properites

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/jpaTest
jdbc.username=root
jdbc.password=123456

编写配置类

@Configuration
@ComponentScan(value = "com.example")
@PropertySource(value = "classpath:jdbcConfig.properties")
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.example.dao", transactionManagerRef = "transactionManager",
entityManagerFactoryRef = "entityManagerFactory")
public class SpringConfiguration {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;
    @Bean
    public DataSource dataSource(){
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        try{
            dataSource.setDriverClass(driver);
            dataSource.setJdbcUrl(url);
            dataSource.setUser(username);
            dataSource.setPassword(password);
            return dataSource;
        } catch (PropertyVetoException e) {
            throw new RuntimeException(e.getMessage());
        }
    }
    @Bean
    public PersistenceProvider persistenceProvider(){
        return new HibernatePersistenceProvider();
    }
    @Bean
    public JpaVendorAdapter jpaVendorAdapter(){
        HibernateJpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
        jpaVendorAdapter.setShowSql(true);
        jpaVendorAdapter.setGenerateDdl(false);
        jpaVendorAdapter.setDatabase(Database.MYSQL);
        jpaVendorAdapter.setDatabasePlatform("org.hibernate.dialect.MySQLDialect");
        return jpaVendorAdapter;
    }
    @Bean
    public JpaDialect jpaDialect(){
        return new HibernateJpaDialect();
    }
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(
            @Autowired DataSource dataSource,
            @Autowired PersistenceProvider persistenceProvider,
            @Autowired JpaVendorAdapter jpaVendorAdapter,
            @Autowired JpaDialect jpaDialect){
        LocalContainerEntityManagerFactoryBean factory =  new LocalContainerEntityManagerFactoryBean();
        factory.setDataSource(dataSource);
        factory.setPackagesToScan("com.example.domain");
        factory.setPersistenceProvider(persistenceProvider);
        factory.setJpaVendorAdapter(jpaVendorAdapter);
        factory.setJpaDialect(jpaDialect);
        return factory;
    }
    @Bean
    public PlatformTransactionManager transactionManager(@Autowired EntityManagerFactory entityManagerFactory){
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(entityManagerFactory);
        return txManager;
    }
}

编写JPA 接口

@Repository
public interface ICustomerDao extends JpaRepository<Customer, Long>, JpaSpecificationExecutor<Customer> {
}

编写测试类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {SpringConfiguration.class}) //指定 Spring 容器的配置信息
public class ICustomerDaoTest {
    @Autowired
    private ICustomerDao customerDao;
    .....
}