2020最新版SpringCloud(H版&alibaba)框架开发教程（一）

微服务模块

1.建module

2.改pom

3.写yml

4.主启动

5.业务类

PaymentDao：
/**
 * @Author: cws
 * @Date: 9:37 2020/8/12
 * @Description:  微服务模块读和写的操作接口
 * @Version v1.0
 */
@Mapper
public interface PaymentDao {

    public Payment getPaymentById(@Param("id") Long id);

    public int create(Payment payment);
}

entities.Payment：
/**
 * @Author: cws
 * @Date: 0:46 2020/8/12
 * @Description:
 * @Version v1.0
 */
@Data
@AllArgsConstructor  //有参构造
@NoArgsConstructor   //无参构造
public class Payment implements Serializable {
    private Long id;
    private String serial;
}

entities.CommonResult：
/**
 * @Author: cws
 * @Date: 0:50 2020/8/12
 * @Description:   返回前端的通用json实体串
 * @Version v1.0
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {

    //404 not found
    private Integer code;    //返回成功或失败的编码
    private String message;  //返回成功或失败的信息
    private T data;         //前台显示的属性,传什么就返回什么
    public CommonResult(Integer code, String message) {
        this(code , message , null);     //如果失败就返回null
    }
}

PaymentMapper.xml：

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.atguigu.springcloud.dao.PaymentDao">
    <insert id="create" parameterType="com.atguigu.springcloud.entities.Payment" useGeneratedKeys="true" keyProperty="id">
    insert into payment (serial) values (#{serial})
    </insert>


<!--搜索的映射 column数据库的名字，property是java实体类里面的名字（别名），jdbcType是数据库里面的数据类型 -->
    <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>
    <select id="getPaymentById" resultMap="BaseResultMap" parameterType="Long">
    select id , serial from payment where id = #{id}
    </select>

</mapper>

PaymentServiceImpl：
/**
 * @Author: cws
 * @Date: 11:11 2020/8/12
 * @Description:
 * @Version v1.0
 */
@Service
public class PaymentServiceImpl implements PaymentService {

    @Autowired
    private PaymentDao paymentDao;

    @Override
    public Payment getPaymentById(Long id) {
        return paymentDao.getPaymentById(id);
    }

    @Override
    public int create(Payment payment) {
        return paymentDao.create(payment);
    }
}

PaymentService：
/**
 * @Author: cws
 * @Date: 11:10 2020/8/12
 * @Description:
 * @Version v1.0
 */
public interface PaymentService {

    public Payment getPaymentById(@Param("id") Long id);

    public int create(Payment payment);
}

controller：
/**
 * @Author: cws
 * @Date: 11:13 2020/8/12
 * @Description:
 * @Version v1.0
 */
@RestController
@Slf4j   //打印日志
public class PaymentController {

    @Autowired
    private PaymentService paymentService;


    @PostMapping(value = "/payment/create")
    public CommonResult create(Payment payment) {
        int result = paymentService.create(payment);
  　　　 log.info("======插入结果======="+result);   //测试插入结果的日志
        if (result > 0) {
            return new CommonResult(200, "插入成功", result);
        } else {
            return new CommonResult(404, "插入失败" , null);
        }
    }

    @GetMapping(value = "/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id) {
        Payment result = paymentService.getPaymentById(id);
        if (result!=null) {
            return new CommonResult(200, "查询成功", result);
        } else {
            return new CommonResult(404, "查询失败" , null);
        }
    }
}

消费者订单模块

配置容器：
/**
 * @Author: cws
 * @Date: 13:59 2020/8/12
 * @Description:
 * @Version v1.0
 */
@Configuration
public class ApplicationContextConfig {

    @Bean    //依赖注入容器   获取对象
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
}

controller：
/**
 * @Author: cws
 * @Date: 14:08 2020/8/12
 * @Description:
 * @Version v1.0
 */
@RestController
@Slf4j
public class OrderController {

    public static final String PAYMENT_URL = "http://localhost:8001";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create( Payment payment) {
        log.info("*******消费者启动创建订单*******");
        CommonResult commonResult = restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);//地址  参数  对象类型
        log.info("=================="+commonResult);
        return commonResult;
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {
        log.info("===========================");
        CommonResult object = restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
        log.info("=============="+object+"=======上面的路径要注意  缺一个/都识别不了======");
        return object;
    }
}

主启动：
/**
 * @Author: cws
 * @Date: 13:45 2020/8/12
 * @Description:
 * @Version v1.0
 */
@SpringBootApplication
public class OrderMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class, args);
    }
}

注：实体CommonResult和Payment一样

工程重构

 

<!-- 项目坐标   在想调用的子项目pom文件上打上坐标调用-->
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
    </dependencies>