springcloud（3）Ribbon 消费者

- 日理万妓 2023-06-06 03:37 50阅读 0赞

### 1.创建消费者模块 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70][]

项目工程结构

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70 1][]

创建后，已配置好的pom

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70 2][]

### 2. 添加 相关的pojo/service/controller ###

其中service

@Service
    public class ProductService {
    	@Autowired
    	ProductClientRibbon productClientRibbon;
    	public List<Product> listProducts(){
    		return productClientRibbon.listProdcuts();
    
    	}
    }

### 3. 添加 调用其他微服务的类 ###

@Component
    public class ProductClientRibbon {
        @Autowired
        RestTemplate restTemplate;
    
        /**
         * 调用 product-data 的products 接口
         * @return
         */
        public List<Product> listProdcuts() {
            return restTemplate.getForObject("http://PRODUCT-DATA-SERVICE/products", List.class);
        }
    }

关于  RestTemplate 的使用详情，查看：[https://blog.csdn.net/lettuce\_/article/details/102463992][https_blog.csdn.net_lettuce_article_details_102463992]

工程结构

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70 3][]

### 4. 添加properties 属性 ###

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    spring:
      application:
        name: product-consumer-ribbon
      thymeleaf:
        cache: false
        prefix: classpath:/templates/
        suffix: .html
        encoding: UTF-8
        mode: HTML5
        servlet:
          content-type: text/html

### 5.  在启动类中添加2注解   ###

@EnableEurekaClient
    @EnableDiscoveryClient

两者基本一致，都可以实现服务发现，也就是能够注册到服务注册中心。
    而且在定义@EnableEurekaClient时也要加上@EnableDiscouveryClient这个注解。
    
    两者的区别是
    
    @EnableDiscoveryClient适用面较广，可以用于eureka，也可以用zookeeper、consul
    @EnableEurekaClient顾名思义，仅适用eureka

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70 4][]

关于 @EnableEurekaClient和@EnableDiscoveryClient的区别

https://blog.csdn.net/u012734441/article/details/78256256?locationNum=1&fps=1

注意: 最新springboot可能有启动类中不添加这两注解也能注册进注册中心(亲测)

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70 5][]

### .6. 启动 ###

启动后出现启动失败情况：

***************************
    APPLICATION FAILED TO START
    ***************************
    
    Description:
    
    Field restTemplate in cn.how2j.springcloud.productconsumerribbon.config.ProductClientRibbon required a bean of type 'org.springframework.web.client.RestTemplate' that could not be found.

解决：在config目录下添加一个配置类

@Configuration
    public class RestTemplateConfig {
        @Bean
        @LoadBalanced
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }
    }

或  添加bean 到启动类中

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xldHR1Y2Vf_size_16_color_FFFFFF_t_70 6][]

@LoadBalanced注解

实现springcloud ribbon客户端负载均衡

详情查看：[https://blog.csdn.net/xiao\_jun\_0820/article/details/78917215][https_blog.csdn.net_xiao_jun_0820_article_details_78917215]

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[https_blog.csdn.net_lettuce_article_details_102463992]: https://blog.csdn.net/lettuce_/article/details/102463992
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[https_blog.csdn.net_xiao_jun_0820_article_details_78917215]: https://blog.csdn.net/xiao_jun_0820/article/details/78917215