SpringBoot整合SpringData JPA

<!-- springBoot JPA的起步依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

<!-- MySQL连接驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

#数据库连接信息
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root

#JPA配置
spring.jpa.database=MySql
#自动创建数据库表
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
#表中字段命名策略
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy

@Entity
public class User {
    // 主键
    @Id
    @GeneratedValue
    private Long id;
    // 用户名
    private String username;
    // 密码
    private String password;
    // 姓名
    private String name;
    
    /************ get/set方法 ************/
}

public interface UserDao extends JpaRepository<User, Long>, JpaSpecificationExecutor<User> {
}

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class JpaTest {
    @Autowired
    private UserDao userDao;

    @Test
    public void test(){
        List<User> users = userDao.findAll();
        for (User user : users) {
            System.out.println(user);
        }
    }
}

<!--jdk9需要导入如下坐标-->
<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.0</version>
</dependency>