SpringCloud中的Eureka使用_eureka-client4.1.0 instance-id

1.首先需要引入依赖

<!--eureka的客户端-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
 <!--eureka-服务端-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
/dependency>

2.在提供者的application.yml中进行eureka配置（这里使用了集群，就不一一列举了）

server:
  port: 8001
 
spring:
  application:
    name: cloud-payment-service
  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://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: root
 
mybatis:
  mapperLocations: classpath:mapper/*.xml
 
 
eureka:
  client:
    #表示是否将自己注册进Eurekaserver默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
        #单机模式
        #defaultZone:http://eureka7001.com:7001/eureka
        #进行集群操作
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7003.com:7003/eureka
  instance:
    instance-id: payment8001

注册中心的application.yml配置

•  在这里说明以下，多个注册模块可以相互注册相互守望

server:
  port: 7001
 
 
 
eureka:
  instance:
    hostname: eureka7001.com #eureka服务端的实例名称
  client:
    register-with-eureka: false     #false表示不向注册中心注册自己。
    fetch-registry: false     #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
    service-url:
      #集群指向其它eureka服务
      defaultZone: http://eureka7003.com:7003/eureka/
      #单机就是7001自己
      #defaultZone: http://eureka7001.com:7001/eureka/

消费者的application.xml

server:
  port: 80
 
spring:
  application:
    name: cloud-order-service
 
eureka:
  client:
    #表示是否将自己注册进Eurekaserver默认为true。
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetchRegistry: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7003.com:7003/eureka/

3.在提供者启动类使用注解@EnableEurekaClient

       注册中心启动类使用@EnableEurekaServer

下面是一些测试Demo

首先是提供者：

Controller层

    @Value("${server.port}")
    private String serverPort;//添加serverPort
    @GetMapping(value = "/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id)
    {
        Payment payment = paymentService.getPaymentById(id);
 
        if(payment != null)
        {
            return new CommonResult(200,"查询成功，serverPort:"+serverPort,payment);
        }else{
            return new CommonResult(444,"没有对应记录,查询ID: "+id,null);
        }
    }

服务层

@Service
public class PaymentServiceImpl implements PaymentService
{
    @Resource
    private PaymentDao1 paymentDao;
 
    public Payment getPaymentById(Long id)
    {
        return paymentDao.getPaymentById(id);
    }
}

Dao层

@Mapper
public interface PaymentDao1
{
 
     Payment getPaymentById(@Param("id") Long id);
}

Mapper

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 
<mapper namespace="com.peng.springcloud.dao.PaymentDao1">
 
    <resultMap id="BaseResultMap" type="com.peng.springcloud.dto.Payment">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <id column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>
 
    <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
        select * from payment where id=#{id};
    </select>
 
</mapper>

其次是消费者

Controller

@RestController
@Slf4j
@RequestMapping("/consumer/payment")
public class OrderController {
    final static String PAYMENT_URL="http://CLOUD-PAYMENT-SERVICE";
    @Resource
    private RestTemplate restTemplate;
    @GetMapping("/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id, CommonResult.class);
    }
 
}

启动类

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

配置类

        集群需要在消费者的配置上加上@LoadBalanced注解，在controller中吧请求路径改为服务的名字       

 

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

运行结果：

请求http://eureka7001.com:7001/这里的eureka7001.com路径需要在host中配置

 请求注册中心http://eureka7003.com:7003/ （这里没有在上面写，配置什么的和第一个注册中心的配置一样）

请求提供者请求http://localhost:8001/payment/get/11

请求消费者请求http://localhost/consumer/payment/get/11