/*

    使用spring官网的 http://start.spring.io/ 来建立项目包

    生成入口文件，入口文件中对类注释@SpringBootApplication，这个注释是唯一的，标明这个类是入口类

    可以直接启动该类，发现项目是通过内置的Tomcat启动的，端口号8080

    因为还没有配置数据库，所以先用注释标明先不启动DataSource

 */

@SpringBootApplication

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})

public class XcxloginApplication {

    public static void main(String[] args) {

        SpringApplication.run(XcxloginApplication.class, args);

    }

}

/**

 * 访问控制器需要用@RestController来声明，表示告诉Spring直接渲染返回string给调用者

 * 路由通过@RequestMapping来声明

 */

@RestController

public class HelloWorldController {

    @RequestMapping(value = "/index", method = RequestMethod.GET)

    public String index(){

        return "HelloWorld";

    }

}

实体类、JPA、控制类

@Entity

@Table(name = "t_user")

public class UserEntity implements Serializable {

    @Id

    @GeneratedValue

    @Column(name = "t_id")

    private Long id;

    @Column(name = "t_name")

    private String name;

    @Column(name = "t_age")

    private int age;

    @Column(name = "t_address")

    private String address;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

}

public interface UserJPA extends JpaRepository<UserEntity, Long>,

        JpaSpecificationExecutor<UserEntity>, Serializable {

}

@RestController

@RequestMapping(value = "/user")

public class UserController {

    @Autowired

    private UserJPA userJPA;

    /**

     * 查询用户列表

     */

    @RequestMapping(value = "/list", method = RequestMethod.GET)

    public List<UserEntity> list(){

        return userJPA.findAll();

    }

}