1：首先是注册中心pom文件，添加eureka服务端，然后是application.yml文件配置

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
server:
  port: 7001
eureka:
  instance:
    hostname: eureka7001
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka7001:7001/eureka/

完成之后在启动类添加相应注解@EnableEurekaServer

@SpringBootApplication
@EnableEurekaServer
public class Eureka7001Application {
    public static void main(String[] args) {
        SpringApplication.run(Eureka7001Application.class, args);
    }
}

启动项目访问http://eureka7001:7001/

服务注册中心完成

2：ribbon服务提供者

首先是pom和application配置

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
server:
  port: 8001
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml   #mybatis
  type-aliases-package: com.sinosoft.springcloud.cloudapi.entities   #所有实体类所在路径
  mapper-locations: classpath:mybatis/mapper/**/*.xml
spring:
  application:
    name: product-dept
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource        #当前数据源操作类型
    driver-class-name: com.mysql.cj.jdbc.Driver        #mysql驱动包
    url: jdbc:mysql://ip:3306/cloud01     #数据库地址
    username: root
    password: MyNewPass4!
    dbcp2:
      min-idle: 5                                   #数据库连接池最少维持连接数
      initial-size: 5                               
      max-total: 5                                  
      max-wait-millis: 200                          
eureka:
  client:
    service-url:
      defaultZone: http://eureka7001:7001/eureka/ #注册中心地址

然后是controller，service以及dao代码

@RestController
public class DeptController {
    @Autowired
    private DeptService deptService;
    @RequestMapping("/deptList")
    public List<DeptEntity> queryDeptEntityList(){
        return deptService.queryListDeptEmtity();
    }
}
@Service
public class DeptServiceImpl implements DeptService {
    @Autowired
    private DeptDao dao;
    @Override
    public List<DeptEntity> queryListDeptEmtity() {
        return dao.selListDeptEntity();
    }
}
@Mapper
public interface DeptDao {
    List<DeptEntity> selListDeptEntity();
}

然后是启动类，添加@EnableEurekaClient

@SpringBootApplication
@EnableEurekaClient
public class Product8001Application {
    public static void main(String[] args) {
        SpringApplication.run(Product8001Application.class, args);
    }
}

启动访问http://localhost:8001/deptList

再新建一个相同的服务提供者，端口号改为8002，数据库使用另一个，这样查询的数据不一样就能保证使用的是不同的服务提供者，不再贴出代码

3：消费者

消费者pom和application.yml，有时候坐标无效，可以添加版本号试试

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>
server:
  port: 80
spring:
  application:
    name: dept80
eureka:
  client:
    service-url:
      defaultZone: http://eureka7001:7001/eureka/

然后是controller代码，注意product-dept是服务提供者名称

@RestController
public class DeptController {
    @Autowired
    private RestTemplate restTemplate;
    private static String RIBBO_URL="http://product-dept";
    @SuppressWarnings("unchecked")
    @RequestMapping("/deptList")
    public List<DeptEntity> queryEntityList(){
        return restTemplate.getForObject(RIBBO_URL+"/deptList",List.class);
    }
}

新建类，添加注解@LoadBalanced实现负载均衡

@Configuration
public class ConfigBean {
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

然后启动类

@SpringBootApplication
@EnableEurekaClient
public class Dept80Application {
    public static void main(String[] args) {
        SpringApplication.run(Dept80Application.class, args);
    }
}