eureka是一个服务注册中心,有两个重要的组件,eurekaClient(客户端)、eurekaClient(服务端)。
eureka已经停更了,但是因为还是有很多公司在用,所以这里记录学习下,目前业界有蛮多的替代方案,zookeeper、consul、阿里的Nacos(强烈推荐)...
一:新建项目euraka服务1(maven项目)
1.引入依赖
<?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>2020</artifactId>
<groupId>com.atguigu.springcloud</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>com.atguigu.springcloud</groupId>
<artifactId>cloud-api-commens</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</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.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
</dependencies>
</project>
2.修改yml
server:
port: 7001
eureka:
instance:
hostname: eureka7001.com
client:
register-with-eureka: false #表示不注册自己
fetch-registry: false #表示不需要检索服务
service-url:
# 与eureka交互地址
defaultZone: http://eureka7002.com:7002/eureka/
server:
enable-self-preservation: false #关闭自我保护,服务心跳停止立刻删除注册信息
eviction-interval-timer-in-ms: 2000 #心跳时间间隔 默认90秒
3.启动类
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})//排除DataSource注入bean eureka服务器不需要数据源
@EnableEurekaServer
public class EurekaMain7001 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7001.class,args);
}
二:新建项目euraka服务2(maven项目)
1.引入依赖
<?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>2020</artifactId>
<groupId>com.atguigu.springcloud</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>com.atguigu.springcloud</groupId>
<artifactId>cloud-api-commens</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</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.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
</dependencies>
</project>
2.修改yml
server:
port: 7002
eureka:
instance:
hostname: eureka7002.com #ureka可视化界面上的url配置
client:
register-with-eureka: false #表示不注册自己
fetch-registry: false #表示不需要检索服务
service-url:
# 守望地址
defaultZone: http://eureka7001.com:7001/eureka/
server:
enable-self-preservation: false #关闭自我保护,服务心跳停止立刻删除注册信息
eviction-interval-timer-in-ms: 2000 #心跳时间间隔 默认90秒
3.启动类
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})//排除DataSource注入bean eureka服务器不需要数据源
@EnableEurekaServer
public class EurekaMain7002 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7001.class,args);
}
三:服务提供者,服务消费者
1.复制一个服务提供者 更改端口名,业务层随便写写,测试用
2.引入eureka客户端依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
3.修改yml文件
server:
port: 8001
spring:
application:
name: cloud-paymen-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
# 数据源基本配置
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/db2019?useunicode=true&characterEncoding=utf8&userSSL=false
# 数据源其他配置
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
filters: stat,wall
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.atguigu.springcloud.com.atguigu.springcloud.entities #所有entity别名类所在的包
eureka:
client:
service-url:
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
register-with-eureka: true #是否注册进入eureka
fetch-registry: true #是否抓取注册信息
instance:
instance-id: payment8001 #路径别名
prefer-ip-address: true #可以显示路径
lease-renewal-interval-in-seconds: 1 #定时发送心跳包 默认30秒
lease-expiration-duration-in-seconds: 2 #eureka最后一次收到心跳包 超过3秒清除信息 默认90秒
4.修改启动类注解
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient // 这个注解的作用是让注册中心能够发现服务
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class,args);
}
}
5.新建服务消费者,pom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>2020</artifactId>
<groupId>com.atguigu.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>springcloud-consumer-oder80</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>com.atguigu.springcloud</groupId>
<artifactId>cloud-api-commens</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</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.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<!--<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>-->
<!--<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
6.消费者yml文件
server:
port: 80
eureka:
client:
service-url:
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
register-with-eureka: true #是否注册进入eureka
fetch-registry: true #是否抓取注册信息
spring:
application:
name: cloud-order-service
7.消费者启动类
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@EnableEurekaClient
public class OrderMain80 {
public static void main(String[] args) {
SpringApplication.run(OrderMain80.class,args);
}
}
8.消费者注入restTemplate
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 ApplicationContentConfig {
@Bean
@LoadBalanced
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
9.消费者contoller
package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommenResult;
import com.atguigu.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
@Slf4j
public class OrderController {
@Autowired
RestTemplate restTemplate;
private String url = "http://CLOUD-PAYMEN-SERVICE/";
@GetMapping(value = "consumer/payment/create")
public CommenResult<Payment> create(Payment payment){
return restTemplate.postForObject(url+"payment/create",payment,CommenResult.class);
}
@GetMapping(value = "consumer/payment/get/{id}")
public CommenResult<Payment> getPayment(@PathVariable("id") long id){
return restTemplate.getForObject(url+"payment/get/"+id,CommenResult.class);
}
}
四:测试
1.http://eureka7001.com:7001/

2.调用消费者接口


默认轮询调用两个服务提供者
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