SpringCloudAlibaba的优势：
阿里使用过的组件经历了考验，性能强悍，设计合理，现在开源出来大家用成套的产品搭配完善的可视化界面给开发运维带来了极大的便利，搭建简单，学习曲线低。
SpringCloud Alibaba-Nacos：注册中心(服务发现/注册)
SpringCloud Alibaba-Nacos：配置中心(动态配置管理)
SpringCloud-Ribbon：负载均衡
SpringCloud-Feign：声明式HTTP客户端(调用远程服务)
SpringCloud Alibaba-Sentinel：服务容错(限流、降级、熔断)
SpringCloud-Gateway：API网关
SpringCloud-Sleuth：调用链监控
SpringCloud Alibaba-Seata：原 Fescar，即分布式事务

<dependencyManagement>
    <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-alibaba-dependencies</artifactId>
      <version>2.1.0.RELEASE</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

第一步：gulimall-common的pom.xml加入依赖
<!--        服务注册/发现-->
<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

第二步：下载nacos
地址：github.com/alibaba/nacos/releases
版本：1.1.3

第三步：修改你要将那个服务注册上去的application.yml
spring:
  application:
    name: gulimall-coupon
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848        

第四步：在启动类上标注注解
@EnableDiscoveryClient

第五步：访问nacos
路径：127.0.0.1:8848/nacos/#/login

1.在gulimall-common pom.xml文件加入
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

2.//gulimall-coupon
@RestController
@RequestMapping("coupon/coupon")
public class CouponController {
    @RequestMapping("/member/list")
    public R membercoupons(){
        CouponEntity couponEntity = new CouponEntity();
        couponEntity.setCouponName("满100减10");
        return R.ok().put("coupon",Arrays.asList(couponEntity));
    }
}

3.//gulimall-member
@FeignClient("gulimall-coupon")
public interface CouponFeignService {
    @RequestMapping("/coupon/coupon/member/list")
    public R membercoupons();
}

4.//开启远程调用功能:EnableFeignClients
@EnableRedisHttpSession
@EnableFeignClients(basePackages = "com.xunqi.gulimall.member.feign")
@EnableDiscoveryClient
@SpringBootApplication
public class GulimallMemberApplication {
    public static void main(String[] args) {
        SpringApplication.run(GulimallMemberApplication.class, args);
    }
}

5.调用
@RestController
@RequestMapping("member/member")
public class MemberController {
    @Autowired
    private MemberService memberService;
    @Autowired
    CouponFeignService couponFeignService;
    @RequestMapping("/coupons")
    public R test(){
        MemberEntity memberEntity = new MemberEntity();
        memberEntity.setNickname("张三");
        R  membercoupons = couponFeignService.membercoupons();
        return R.ok().put("member",memberEntity).put("coupons",membercoupons.get("coupons"));
    }
}

1.在gulimall-common pom.xml文件加入
<!--        配置中心来做配置管理-->
<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

2.在gulimall-coupon创建bootstrap.yml
spring:
  application:
    name: gulimall-coupon
  cloud:
    nacos:
      config:
        server-addr: localhost:8848

//此方法有了注册中心后，不再使用
application.properties
coupon.user.name=zhangsan
coupon.user.age=18

了解几个概念
1.命名空间：配置隔离；默认是public
2.配置集：所有配置的集合
3.配置集id：类似于文件名
4.配置分组

2.application.properties
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.application.name=gulimall-gateway
server.port=88

3.bootstrap.yml
spring:
  application:
    name: gulimall-coupon
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
      config:
        server-addr: localhost:8848
#        file-extension: yml
        namespace: ea65d118-135f-4928-bbc6-c8ec85b3fd78

4.application.yml
spring:
  cloud:
    sentinel:
      transport:
        #配置sentinel dashboard地址
        dashboard: localhost:8080
    gateway:
      routes:
#        - id: test_route
#          uri: https://www.baidu.com
#          predicates:
#            - Query=uri,baidu
#
#        - id: qq_route
#          uri: https://www.qq.com
#          predicates:
#            - Query=uri,qq