SpringCloudAlibaba

Nacos

下载

• 下载：github.com/alibaba/nac…
• 启动：startup.cmd -m standalone
• 访问：http://localhost:8848/nacos/ 账号密码：nacos

概念

• 配置文件通过namespace、group 和 dataId 来唯一确定
• dataId的格式：${spring.application.name}-${spring.profiles.active}.${file-extension}
  • spring.profiles.active为空时，连接符-也将不存在
  • ${file-extension}：默认为properties
• 拉取多个共享文件，要在同一命名空间下，不能跨命名空间
• 注意springboot和springcloud的版本对应

配置中心

• 引入依赖

  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-bootstrap</artifactId>
      <version>4.1.5</version>
  </dependency>
      
  <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
      <version>2021.0.1.0</version>
  </dependency>
  

• 完整bootstrap.properties配置：

  spring.application.name=testccb
  spring.cloud.nacos.config.username=nacos
  spring.cloud.nacos.config.password=nacos
  spring.cloud.nacos.config.server-addr=192.168.1.211:8848
  spring.cloud.nacos.config.namespace=4f4b-363e-47a5-8a-dbd288c
  spring.cloud.nacos.config.group=com.iotsh
  
  # 拉取共享的配置
  spring.cloud.nacos.config.extension-configs[0].data-id=testccb.properties
  spring.cloud.nacos.config.extension-configs[0].group=ccb
  spring.cloud.nacos.config.extension-configs[0].refresh=true
  

​

注册中心

• 引入依赖

  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-bootstrap</artifactId>
      <version>4.1.5</version>
  </dependency>
  
  <dependency>
      <groupId>com.alibaba.cloud</groupId>
      <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
      <version>2021.0.1.0</version>
  </dependency>
  

• 配置文件

  spring.cloud.nacos.discovery.server-addr=192.168.1.211:8848
  spring.cloud.nacos.discovery.username=nacos
  spring.cloud.nacos.discovery.password=nacos
  spring.cloud.nacos.discovery.namespace=ed4b94b3-deff-49f1-8973-34029756083d
  

• 主启动类：@EnableDiscoveryClient

OpenFeign

• 引入依赖

  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
  </dependency>
  

• 主启动类：@EnableFeignClients

  @SpringBootApplication
  @EnableDiscoveryClient
  @EnableFeignClients 
  public class EurekaClientApplication {
      public static void main(String[] args) {
          SpringApplication.run(CategoryApplication.class,args);
      }
  }
  

• 配置文件

  feign:
    client:
      config:
        default:
          connect-timeout: 5000
          read-timeout: 5000
  

• 创建FeignClient (调用者)，注意传参

  @FeignClient(value = "product") // 被调用的服务名称
  public interface ProductClient {
      
      @RequestMapping("/status") // 被调用的服务接口
      public String status();
  
      @GetMapping("/paramRequest")
      public String paramRequest(@RequestParam("id") Integer id, @RequestParam("name") String name);
  
      @PostMapping("/bodyRequest")
      public String bodyRequest(@RequestBody User user);
  }
  

• Controller中使用

  @RestController
  public class UserController {
      @Autowired
      private ProductClient productClient;  
  
      @GetMapping("/find")
      public String find(){
          return productClient.status();
      }
  }
  

• 被调用的服务

  @RestController
  public class ProductController {
      // 没有参数
      @RequestMapping("/status")
      public String status(){
          return "client b is ok!";
      }
  
      // param参数
      @GetMapping("/paramRequest")
      public String paramRequest(@RequestParam("id") Integer id, @RequestParam("name") String name){
          return "paramRequest method is ok!, id:" + id +", name:"+ name;
      }
  
      // body有参数
      @PostMapping("/bodyRequest")
      public String bodyRequest(@RequestBody User user){
          return "bodyRequest method is ok!, user:" + user.toString();
      }
  }