1. provider 服務生產者環境的搭建

   匯入相關依賴：

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-eureka</artifactId>
   <version>1.4.6.RELEASE</version>
</dependency>
​
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
 

配置yml檔案

server:
  port: 8001
​
mybatis:
  type-aliases-package: com.fly.pojo
  mapper-locations: classpath:mybatis/mapper/*.xml
  configuration:
   map-underscore-to-camel-case: true
​
spring:
  application:
   name: springcloud-provider-dept
 #資料來源配置
  datasource:
   type: com.alibaba.druid.pool.DruidDataSource
   driver-class-name: org.gjt.mm.mysql.Driver
   url: jdbc:mysql://localhost:4001/db01?serverTimeZone=UTC&useUnicode=true&characterEncoding=utf-8
   username: *****
   password: *******
​
#eureka配置
eureka:
  client:
   service-url:
   #連線的eureka地址
    defaultZone: http://localhost:7001/eureka
​
  instance:
   instance-id: springcloud-privider-dept-8001
​
​
info:
  app.name: zhu
  company.name: zhu
 

編寫主啟動類

@SpringBootApplication
@EnableEurekaClient //開啟eureka客戶端配置
//@EnableCircuitBreaker
public class ProviderApplication {
  public static void main(String[] args) {
    SpringApplication.run(ProviderApplication.class, args);
   }
}

2. consumer服務消費者的搭建

##服務的搭建和配置和生產者一致##

呼叫方式：Ribbon 和 Feign 兩種

匯入ribbon相關的依賴

<!-- ribbon -->
<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-ribbon</artifactId>
   <version>1.4.6.RELEASE</version>
</dependency>

Ribbon呼叫方式：

//編寫RestTemplate配置，並配置負載均衡機制預設是輪詢（這樣可以直接通過服務名去呼叫）
@Bean
@LoadBalanced
public RestTemplate restTemplate() {
   return new RestTemplate();
}
​
​
//呼叫示例：
@RestController
public class DeptConsumerController {
​
   @Resource
   private RestTemplate restTemplate;
​
   @Resource
   private DiscoveryClient client;
​
   //服務的生產者的服務名
   private static final String REST_URL_PREFIX = "http://springcloud-provider-dept";
​
   @GetMapping("/consumer/dept/get/{id}")
   public Dept get(@PathVariable("id") Long id) {
     Dept dept = restTemplate.getForObject(REST_URL_PREFIX + "/dept/getById?id=" + id, Dept.class);
     return dept;
   }
}

Feign 呼叫方式：

Feign 呼叫方式更能體現面向介面程式設計的思想

//主啟動類中需要開啟Feign相關的配置
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(basePackages = {"com.fly"})
public class FeignConsumerApplication {
  public static void main(String[] args) {
    SpringApplication.run(FeignConsumerApplication.class, args);
   }
}
​
//1. 編寫一個服務呼叫的介面
@Component
//指定要呼叫的服務端的服務名稱
@FeignClient(value = "springcloud-provider-dept")
public interface DeptService {
​
  @GetMapping("/dept/getById")
  public Dept queryDeptById(Long id);
​
  @GetMapping("/dept/list")
  public List<Dept> queryAll();
}
​
​
//按照介面的方式直接呼叫
@RestController
public class DeptConsumerController {
​
  @Resource
  private DeptService deptService;
​
  @GetMapping("/consumer/dept/get/{id}")
  public Dept get(@PathVariable("id") Long id) {
    return deptService.queryDeptById(id);
   }
​
  @GetMapping("/consumer/dept/list")
  public List<Dept> list() {
    return deptService.queryAll();
   }
}