day01-springcloudalibaba组件使用_dependency 'com.alibaba.cloud:spring-cloud-starter

1.SpringCloudNacos使用

• 引入依赖

   <dependencies>
      <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>
  
  <dependency> 
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
  </dependency>
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• 启动nacos，这里因为我的虚拟机内存只有2个G启动nacos后，内存不够，所以需要修改startup.sh的jvm参数

  

• 修改jvm参数后，发现内存多了不少 （将近1个g）sh bin/startup.sh -m standalone (单机启动命令)

• yml配置

    cloud:
      nacos:
        discovery:
          server-addr: 10.211.55.3:8848
    application:
      name: dreammall-coupon
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• 加上注解

  @SpringBootApplication
  @EnableDiscoveryClient
  @MapperScan("com.liubo.coupon.mapper")
  public class CouponApplication {
      public static void main(String[] args) {
          SpringApplication.run(CouponApplication.class,args);
      }
  }
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• 访问nacos控制台 http://10.211.55.3:8848/nacos/index.html

  

2.openfeign远程调用使用

• 会员查询优惠卷情况

• coupon模块提供查询优惠卷功能给会员模块远程调用

  @RestController
  @RequestMapping("/coupon")
  public class CouponController {
  
      @Autowired
      private CouponHistoryService couponHistoryService;
  
      /**
       * 模拟会员模块查询优惠卷返回结果
       * @return
       */
      @RequestMapping("/coupons")
      public R coupons(){
          Coupon coupon = new Coupon();
          coupon.setCouponName("满100减100");
          return R.ok().put("coupons", Arrays.asList(coupon));
      }
  }
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• feign接口定义

  @FeignClient("dreammall-coupon")
  public interface CouponFeign {
  
      @RequestMapping("/coupon/coupons")
      R coupons();
  }
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• 引入openfeign依赖

  <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-dependencies</artifactId>
     <version>Greenwich.SR3</version>
     <type>pom</type>
     <scope>import</scope>
  </dependency>
  
  <dependency>
  	<groupId>org.springframework.cloud</groupId>
  	<artifactId>spring-cloud-starter-openfeign</artifactId>
  </dependency>
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• 启动类加上注解

  @EnableFeignClients(basePackages = "com.liubo.member.openfeign")  // 声明要扫描的feigin包
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• 调用openfeign查询数据

  @RestController
  @RequestMapping("/member")
  public class MemberController {
      
      @Autowired
      private CouponFeign couponFeign;  
  
      /**
       * openfeign远程调用查询会员所拥有的优惠卷
       * @return
       */
      @RequestMapping("/list")
      public R test(){
          Member member = new Member();
          member.setNickname("张三");
          R r = couponFeign.coupons();
          Object coupons = r.get("coupons");
          return R.ok().put("member",member).put("coupon",coupons);
  
      }
  }
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• 

3.nacos作为配置中心

1.动态配置文件步骤

• 引入依赖

      <!--        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>
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• 创建bootstrap.properties文件

  spring.application.name=dreammall-coupon
  spring.cloud.nacos.config.server-addr=10.211.55.3:8848
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• controller层实现

  @RestController
  @RefreshScope   // 配置中心更新实时刷新
  @RequestMapping("/coupon")
  public class CouponController {
  
      @Value("coupon.user.name")
      private String userName;
  
      @Value("coupon.user.age")
      private String age;
  
      /**
       * 动态配置测试
       * @return
       */
      @RequestMapping("/config")
      public R testConfig(){
         return R.ok().put("name",userName).put("age",age);
      }
  }
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• 添加配置文件 命令规则:服务名.properties

  

• 如果有bootstrap.properties和配置中心同时配置，会优先读取配置中心

  

2.命令空间与配置分组

• 命令空间：每个服务都有自已的配置文件

• 配置分组：区别dev、test、prod环境

  

• properties配置

  spring.application.name=dreammall-coupon
  spring.cloud.nacos.config.server-addr=10.211.55.3:8848
  # 命令空间ID
  spring.cloud.nacos.config.namespace=c076c9de-f4ed-4646-a316-8df40b4faf51
  # 配置分组
  spring.cloud.nacos.config.group=prod
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• 加载多配置集

  

4.Gateway网关

• 引入依赖

  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-gateway</artifactId>
  </dependency>
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• yaml配置

  server:
    port: 88
  spring:
    cloud:
      nacos:
        discovery:
          server-addr: 10.211.55.3:8848
      gateway:
        routes:
          - id: query_route
            uri: https://www.baidu.com
            predicates:
              - Query=baz
  
    application:
      name: dreammall-gateway
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• 访问localhost:88?baz 跳转到百度首页