二、SpringCloud五大神獸之Eureka（服務註冊與發現）
阿新 • • 發佈：2018-12-13
ps：此工程為服務提供者叢集的建立並且註冊到eureka中，同時測試服務的發現，由於主要講解eureka知識，因此本例中一些其餘資料庫操作等例子不一一指出，在系列文章結尾會提供完整版例子下載。
1、pom檔案編寫：
<dependencies> <!-- 引入自己定義的api通用包，可以使用Dept部門Entity --> <dependency> <groupId>com.zhanghf</groupId> <artifactId>microservisecloud-api</artifactId> <version>${project.version}</version> </dependency> <!-- actuator監控資訊完善 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <!-- 將微服務provider側註冊進eureka --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-core</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jetty</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> </dependency> <!-- 修改後立即生效，熱部署 --> <dependency> <groupId>org.springframework</groupId> <artifactId>springloaded</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency> </dependencies>
2、application.yml配置檔案編寫：
2.1、服務提供者8001配置檔案：
server: port: 8001 mybatis: config-location: classpath:mybatis/mybatis.xml # mybatis配置檔案所在路徑 type-aliases-package: com.zhanghf.springcloud.entities # 所有Entity別名類所在包 mapper-locations: classpath:mybatis/mapper/**/*.xml # mapper對映檔案 spring: application: name: microservicecloud-dept datasource: type: com.alibaba.druid.pool.DruidDataSource # 當前資料來源操作型別 driver-class-name: org.gjt.mm.mysql.Driver # mysql驅動包 url: jdbc:mysql://localhost:3306/clouddb01 # 資料庫名稱 username: root password: dbcp2: min-idle: 5 # 資料庫連線池的最小維持連線數 initial-size: 5 # 初始化連線數 max-total: 5 # 最大連線數 max-wait-millis: 200 # 等待連接獲取的最大超時時間 eureka: client: #客戶端註冊進eureka服務列表內 service-url: # defaultZone: http://localhost:7001/eureka 單機 defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/ #叢集 #在eureka介面使微服務提供者顯示更直觀：顯示名稱和ip instance: instance-id: microservicecloud-dept8001 prefer-ip-address: true #訪問路徑可以顯示IP地址 #eureka伺服器中註冊的服務的info頁面的顯示內容 info: app.name: microservicecloud company.name: www.zhanghf.com build.artifactId: $project.artifactId$ build.version: $project.version$
2.2、服務提供者8002配置檔案：
server: port: 8002 mybatis: config-location: classpath:mybatis/mybatis.xml # mybatis配置檔案所在路徑 type-aliases-package: com.zhanghf.springcloud.entities # 所有Entity別名類所在包 mapper-locations: classpath:mybatis/mapper/**/*.xml # mapper對映檔案 spring: application: name: microservicecloud-dept datasource: type: com.alibaba.druid.pool.DruidDataSource # 當前資料來源操作型別 driver-class-name: org.gjt.mm.mysql.Driver # mysql驅動包 url: jdbc:mysql://localhost:3306/clouddb02 # 資料庫名稱 username: root password: dbcp2: min-idle: 5 # 資料庫連線池的最小維持連線數 initial-size: 5 # 初始化連線數 max-total: 5 # 最大連線數 max-wait-millis: 200 # 等待連接獲取的最大超時時間 eureka: client: #客戶端註冊進eureka服務列表內 service-url: # defaultZone: http://localhost:7001/eureka 單機 defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/ #叢集 instance: instance-id: microservicecloud-dept8002 prefer-ip-address: true #訪問路徑可以顯示IP地址 #eureka伺服器中註冊的服務的info頁面的顯示內容 info: app.name: microservicecloud company.name: www.zhanghf.com build.artifactId: $project.artifactId$ build.version: $project.version$
2.3、服務提供者8003配置檔案：
server:
port: 8003
mybatis:
config-location: classpath:mybatis/mybatis.xml # mybatis配置檔案所在路徑
type-aliases-package: com.zhanghf.springcloud.entities # 所有Entity別名類所在包
mapper-locations: classpath:mybatis/mapper/**/*.xml # mapper對映檔案
spring:
application:
name: microservicecloud-dept
datasource:
type: com.alibaba.druid.pool.DruidDataSource # 當前資料來源操作型別
driver-class-name: org.gjt.mm.mysql.Driver # mysql驅動包
url: jdbc:mysql://localhost:3306/clouddb03 # 資料庫名稱
username: root
password:
dbcp2:
min-idle: 5 # 資料庫連線池的最小維持連線數
initial-size: 5 # 初始化連線數
max-total: 5 # 最大連線數
max-wait-millis: 200 # 等待連接獲取的最大超時時間
eureka:
client: #客戶端註冊進eureka服務列表內
service-url:
# defaultZone: http://localhost:7001/eureka 單機
defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/ #叢集
instance:
instance-id: microservicecloud-dept8003
prefer-ip-address: true #訪問路徑可以顯示IP地址
#eureka伺服器中註冊的服務的info頁面的顯示內容
info:
app.name: microservicecloud
company.name: www.zhanghf.com
build.artifactId: $project.artifactId$
build.version: $project.version$
注意：提供者的叢集配置需要注意點主要就在配置檔案中。第一位各個埠要唯一；第二為spring: application: name: microservicecloud-dept要一致，因為eureka中就是通過這個名稱來識別微服務，此3個提供者為一個叢集，因此用統一的名稱；第三個為defaultZone指向的也為eurekaserver的叢集地址，有3個，如果eureka為單機的話指定一個即可。
3、controller實現：
package com.zhanghf.springcloud.controller;
import com.zhanghf.springcloud.entities.Dept;
import com.zhanghf.springcloud.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
public class DeptController
{
@Autowired
private DeptService service;
@Autowired
private DiscoveryClient client;
@RequestMapping(value = "/dept/add", method = RequestMethod.POST)
public boolean add(@RequestBody Dept dept)
{
return service.add(dept);
}
@RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
public Dept get(@PathVariable("id") Long id)
{
return service.get(id);
}
@RequestMapping(value = "/dept/list", method = RequestMethod.GET)
public List<Dept> list()
{
return service.list();
}
/**
* 自測服務發現
* @return
*/
// @Autowired
// private DiscoveryClient client;
@RequestMapping(value = "/dept/discovery", method = RequestMethod.GET)
public Object discovery()
{
List<String> list = client.getServices();
System.out.println("**********" + list);
List<ServiceInstance> srvList = client.getInstances("MICROSERVICECLOUD-DEPT");
for (ServiceInstance element : srvList) {
System.out.println(element.getServiceId() + "\t" + element.getHost() + "\t" + element.getPort() + "\t"
+ element.getUri());
}
return this.client;
}
}
4、啟動類中新增@EnableEurekaClient和@EnableDiscoveryClient註解，後一個為服務發現註解，不需要的話可以不用
package com.zhanghf.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 //本服務啟動後會自動註冊進eureka服務中
@EnableDiscoveryClient //服務發現,（作為了解）Euraka的服務註冊於發現
public class MicroservisecloudProviderDept8001Application {
public static void main(String[] args) {
SpringApplication.run(MicroservisecloudProviderDept8001Application.class, args);
}
}
執行測試：
