SpringCloudAlibaba分佈式組件詳解

SpringCloudAlibaba的優勢：
阿裡使用過的組件經歷瞭考驗，性能強悍，設計合理，現在開源出來大傢用成套的產品搭配完善的可視化界面給開發運維帶來瞭極大的便利，搭建簡單，學習曲線低。
SpringCloud Alibaba-Nacos：註冊中心(服務發現/註冊)
SpringCloud Alibaba-Nacos：配置中心(動態配置管理)
SpringCloud-Ribbon：負載均衡
SpringCloud-Feign：聲明式HTTP客戶端(調用遠程服務)
SpringCloud Alibaba-Sentinel：服務容錯(限流、降級、熔斷)
SpringCloud-Gateway：API網關
SpringCloud-Sleuth：調用鏈監控
SpringCloud Alibaba-Seata：原 Fescar，即分佈式事務

<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加入依賴
<!--        服務註冊/發現-->
<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

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

第三步：修改你要將那個服務註冊上去的application.yml
spring:
  application:
    name: gulimall-coupon
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848        

第四步：在啟動類上標註註解
@EnableDiscoveryClient

第五步：訪問nacos
路徑：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("滿100減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.//開啟遠程調用功能: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.調用
@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("張三");
        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
<!--        配置中心來做配置管理-->
<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>

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

//此方法有瞭註冊中心後，不再使用
application.properties
coupon.user.name=zhangsan
coupon.user.age=18

瞭解幾個概念
1.命名空間：配置隔離；默認是public
2.配置集：所有配置的集合
3.配置集id：類似於文件名
4.配置分組

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