三、Eureka注册与发现之Eureka Comsumer

「爱情、让人受尽委屈。」 2022-12-26 14:27 135阅读 0赞

**SpringCloud系列目录：**

*  [一、SpringCloud简介][SpringCloud]
 *  [二、Eureka服务注册与发现][Eureka]
 *  [三、Eureka注册与发现之Eureka Comsumer][Eureka_Eureka Comsumer]
 *  [四、Eureka、Server Provider集群配置][Eureka_Server Provider]
 *  [五、Ribbon和OpenFeign][Ribbon_OpenFeign]

--------------------

续上片博文，如果在一篇博文中写完Eureka所有的内容，篇幅会过长，这样比较容易漏掉某项配置。还望各位大佬见谅

上篇博文说道，我们目前已经有了商场和商户，目前还缺少一个用户，用户需要通过商场找到商户，并从商户中获取到服务。**那接下来我们就新增80用户服务**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz_size_16_color_FFFFFF_t_70]

###### 一、构建项目 ######

先看下module的结构，其中的config可以先不用关注，这个是后续提到的**负载均衡的方式**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz_size_16_color_FFFFFF_t_70 1]

1） 修改pom.xml

<dependencies>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.gaowz</groupId>
                <artifactId>cloud-api-commons</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
    
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
        </dependencies>

2）配置application.yml

server:
      port: 80
    
    Spring:
      application:
        #微服务名称 此处的名称即为注册发现中心的名称
        name: cloud-consumer-order
        
    eureka:
      client:
        register-with-eureka: true
        fetch-registry: true
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka

3）主启动类

@EnableEurekaClient
    @SpringBootApplication
    public class OrderMain80 { 
        public static void main(String[] args) { 
            SpringApplication.run(OrderMain80.class,args);
        }
    }

4）业务代码

package com.gao.controller;
    
    import com.gao.domain.CommonResult;
    import com.gao.domain.Payment;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    import javax.annotation.Resource;
    
    /** * @program: tx_springcloud_02 * @description: 订单的控制层 * @author: gaowz * @create: 2020-11-16 14:40 **/
    @RestController
    @RequestMapping("/order")
    public class OrderController { 
        
        //集群环境下只写服务名称
        public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
    
    
        @Resource
        private RestTemplate restTemplate;
    
        @GetMapping("/consumer/payment/create")
        public CommonResult<Payment> create(Payment payment) { 
            return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);  //写操作
        }
    
        @GetMapping("/consumer/payment/get/{id}")
        public CommonResult<Payment> getPayment(@PathVariable("id") Long id) { 
            return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
        }
    
        /** * 使用的是getforentity * @param id * @return */
        @GetMapping("/consumer/payment/getEntity/{id}")
        public CommonResult<Payment> getPayment2(@PathVariable("id") Long id) { 
    
            ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
            if (entity.getStatusCode().is2xxSuccessful()){ 
                return entity.getBody();
            }else{ 
                return new CommonResult<>(444,"操作失败");
            }
        }
    }

5）测试

*  首先8001服务先自测看是否有问题，发现是OK的~  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz_size_16_color_FFFFFF_t_70 2]
 *  然后再通过80服务调用8001服务是否依然是OK的，此处远程调用的方式是**restTemplate**的方式  
    ![在这里插入图片描述][202012082157142.png]

此处我们发现即是通过80客户端是可以访问到对应的服务的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz_size_16_color_FFFFFF_t_70]  
  到这里单体的注册发现，以及服务调用就已经结束了。但是不知道大家有没有发现，到目前为止，我们的Server Provider和 Eureka Server都是都是只有一台。这样的架构行不行呢，说实话其实是没有问题的，但是万一哪天Provdier或者是Eureka Server掉线了，那我们的80客户端还能访问吗？答案是不可以的。  
  
  [使用集群可以很好的解决上述问题][Eureka_Server Provider]

欢迎各位优秀的工程师批评指正~

[源码地址Git][Git]

[SpringCloud]: https://blog.csdn.net/gwz_6903/article/details/110672126
[Eureka]: https://blog.csdn.net/gwz_6903/article/details/110674130
[Eureka_Eureka Comsumer]: https://blog.csdn.net/gwz_6903/article/details/110729300
[Eureka_Server Provider]: https://blog.csdn.net/gwz_6903/article/details/110900700
[Ribbon_OpenFeign]: https://blog.csdn.net/gwz_6903/article/details/111462923
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201207225102439.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20201208215402237.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d3el82OTAz,size_16,color_FFFFFF,t_70
[202012082157142.png]: https://img-blog.csdnimg.cn/202012082157142.png
[Git]: https://github.com.cnpmjs.org/Gwisdomm/tx_SpringCloud_02.git