Spring Cloud Eureka服务注册和发现 ，Eureka是Spring Cloud中服务注册和发现的框架，是早期spring cloud在前期包阔目前也是仍然在使用的一个服务注册和发现框架。这里主要当学习笔记吧，方便以后来复习，代码后面会保存到Github。
1.服务架构说明
主要通过简单的Demo演示Eureka的基本使用，下面是基础的服务架构图
- 用户订单服务Order为用户发起的请求
- Eureka服务集群完成对微服务的注册和发现。
- 订单服务实际上处理用户订单服务Order发来的请求。
整体流程为 用户服务Order 通过resetTemlate（轮询）访问注册在Eureka上的订单服务接口，而这些每一个服务都是一个独立的服务。
2.父工程项目依赖
微服务本身就是把原来的单体项目细分为多个功能模块，降低了系统的耦合性还可以提高并发能力。
下面是父工程的依赖：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>live.yremp</groupId>
<artifactId>live.yremp.springcloud</artifactId>
<version>1.0-SNAPSHOT</version>
<modules>
<module>cloud-provider-payment8001</module>
<module>cloud-provider-payment8002</module>
<module>cloud-consumer-order80</module>
<module>cloud-api-commons</module>
<module>cloud-eureka-server7001</module>
<module>cloud-eureka-server7002</module>
</modules>
<packaging>pom</packaging>
<!--统一管理jar包版本-->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.12</junit.version>
<lombok.version>1.18.10</lombok.version>
<log4j.version>1.2.17</log4j.version>
<mysql.version>8.0.20</mysql.version>
<druid.version>1.1.16</druid.version>
<mybatis.spring.boot.version>2.1.1</mybatis.spring.boot.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</dependency>
<!--spring boot 2.2.2-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--spring cloud Hoxton.SR1-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.1.0.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
<scope>runtime</scope>
</dependency>
<!-- druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.spring.boot.version}</version>
</dependency>
<!--junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<!--log4j-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>3.用户订单模块
3.1项目依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>live.yremp.springcloud</artifactId>
<groupId>live.yremp</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumer-order80</artifactId>
<dependencies>
<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>
<!-- eureka client-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
<dependency>
<groupId>live.yremp</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>3.2 application.yml
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:
#集群则注册到多个Eureka 服务端
defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka3.3 application.properties
#DataSource
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://ip:3306/springcloud1?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=spring
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
mybatis.mapper-locations= classpath:mapper/*.xml
mybatis.type-aliases-package=live.yremp.springcloud.entries3.4 主启动类
package live.yremp.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class OrderMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderMain80.class,args);
}
}3.5 配置类
package live.yremp.springcloud.config;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class ApplicationContextConfig {
@Bean
@LoadBalanced //负载均衡能力（默认轮询）
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}3.6 Controller
package live.yremp.springcloud.controller;
import live.yremp.springcloud.entries.CommonResult;
import live.yremp.springcloud.entries.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@Slf4j
public class OrderController {
// 写死无法完成负载均衡
// public static final String PAYMENT_URL="http://127.0.0.1:8001";
public static final String PAYMENT_URL="http://CLOUD-PAYMENT-SERVICE";
@Resource
private RestTemplate restTemplate;
@GetMapping("consumer/payment/create")
public CommonResult<Payment> create( Payment payment){
log.debug("consumer/payment/create：请求成功");
return restTemplate.postForObject(PAYMENT_URL+"payment/create",payment,CommonResult.class);
}
@GetMapping("consumer/payment/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
}
}4.Eukeka服务端1
4.1 项目依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>live.yremp.springcloud</artifactId>
<groupId>live.yremp</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-eureka-server7001</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>live.yremp</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>4.2 application.yml
server:
port: 7001
eureka:
instance:
hostname: eureka7001.com
client:
#表示不向注册中心注册自己
register-with-eureka: false
#表示自己就是服务注册中心，我的职责就是维护服务实例，并不需要检索服务
fetch-registry: false
service-url:
defaultZone: http://eureka7002.com:7002/eureka/
server:
#关闭自我保护机制，超时直接剔除改微服务，默认开启
enable-self-preservation: false4.3 主启动类
package live.yremp.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7001 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7001.class,args);
}
}5 Eureka服务端2
5.1 项目依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>live.yremp.springcloud</artifactId>
<groupId>live.yremp</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-eureka-server7002</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>live.yremp</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>5.2 application.yml
server:
port: 7002
eureka:
instance:
hostname: eureka7002.com
client:
#表示不向注册中心注册自己
register-with-eureka: false
#表示自己就是服务注册中心，我的职责就是维护服务实例，并不需要检索服务
fetch-registry: false
service-url:
defaultZone: http://eureka7001.com:7001/eureka/5.3 主启动类
package live.yremp.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7002 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7002.class,args);
}
}6 订单服务1
6.1 项目依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>live.yremp.springcloud</artifactId>
<groupId>live.yremp</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8001</artifactId>
<dependencies>
<!-- 包含了sleuth zipkin 数据链路追踪-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zipkin</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--eureka client-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>live.yremp</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>6.2 application.yml
server:
port: 8001
spring:
application:
name: cloud-payment-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:
#集群则注册到多个Eureka 服务端
defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka
instance:
instance-id: payment8001
prefer-ip-address: true
#Eureka客户端每隔多久向服务端发送一次心跳
lease-renewal-interval-in-seconds: 1
#服务端在距离最后一次收到心跳等待时间，超过就会剔除该微服务
lease-expiration-duration-in-seconds: 26.3 application.properties
#DataSource
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://39.105.173.178:3306/springcloud1?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=spring
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
mybatis.mapper-locations= classpath:mapper/*.xml
mybatis.type-aliases-package=live.yremp.springcloud.entries
6.4 Mapper xml
<?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="live.yremp.springcloud.dao.PaymentDao">
<insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
insert into payment(serial) values(#{serial});
</insert>
<select id="getPaymentById" parameterType="Long" resultType="live.yremp.springcloud.entries.Payment">
select * from payment where id=#{id};
</select>
</mapper>6.5 Dao层
package live.yremp.springcloud.dao;
import live.yremp.springcloud.entries.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
@Mapper
public interface PaymentDao {
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}6.6 Service层
PaymentService
package live.yremp.springcloud.services;
import live.yremp.springcloud.entries.Payment;
import org.apache.ibatis.annotations.Param;
public interface PaymentService {
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}PaymentServiceImp
package live.yremp.springcloud.services.imp;
import live.yremp.springcloud.dao.PaymentDao;
import live.yremp.springcloud.entries.Payment;
import live.yremp.springcloud.services.PaymentService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class PaymentServiceImp implements PaymentService {
@Resource
private PaymentDao paymentDao;
@Override
public int create(Payment payment) {
return paymentDao.create(payment);
}
@Override
public Payment getPaymentById(Long id) {
return paymentDao.getPaymentById(id);
}
}6.7 Controller 层
package live.yremp.springcloud.controller;
import live.yremp.springcloud.entries.CommonResult;
import live.yremp.springcloud.entries.Payment;
import live.yremp.springcloud.services.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.List;
@RestController
@Slf4j
public class PaymentController {
@Resource
PaymentService paymentService;
@Value("${server.port}")
private String serverPort;
@Resource
private DiscoveryClient discoveryClient;
@PostMapping(value = "/payment/create")
public CommonResult create(@RequestBody Payment payment){
int result=paymentService.create(payment);
System.out.println("插入结果----->"+result);
if(result>0){
return new CommonResult(200,"插入成功,serverport="+serverPort,result);
}else {
return new CommonResult(400,"插入失败",null);
}
}
@GetMapping(value = "/payment/get/{id}")
public CommonResult getPaymentById(@PathVariable("id") Long id){
Payment payment =paymentService.getPaymentById(id);
System.out.println("查询结果----->"+payment);
if(payment!=null){
return new CommonResult(200,"查询成功serverport="+serverPort,payment);
}else {
return new CommonResult(400,"查询失败serverport="+serverPort,null);
}
}
@GetMapping("/payment/discovery")
public Object discovery(){
List<String> services =discoveryClient.getServices();
for(String service:services){
log.info("------------->"+service);
}
List<ServiceInstance> serviceInstances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
for(ServiceInstance service:serviceInstances){
log.info("serviceDiscoveryById------------->"+service);
}
return services;
}
}订单服务2和订单服务1基本一致， 这里就不详细展开说了，启动对应的相关服务之后测试对应的服务。
7 测试服务
7.1 订单服务测试
7.2 服务注册与发现测试
7.3用户服务负载均衡测试
用户order服务通过Eureka服务集群随机访问（轮询）订单服务
可以看到虽然是同一个 请求，但是却是由不同的订单微服务来处理的，这就是Eureka的服务注册和发现的简单使用。这里就当学习笔记记录一下了。
标签云
ajax AOP Bootstrap cdn Chevereto CSS Docker Editormd GC Hexo IDEA IPA JavaScript jsDeliver JS樱花特效 JVM Linux markdown Maven MyBatis MyBatis-plus MySQL Pictures Sakura SEO shadowrocket Spring Boot Spring Cloud Spring Cloud Alibaba SpringMVC SSR Thymeleaf V2ray Vue Web WebSocket Wechat Social WordPress Yoast SEO 代理 分页 图床 小幸运 苹果iOS国外账号 苹果IOS账号
Comments | NOTHING