【SpringCloud】（五）：服务注册到Eureka Server

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  上篇文章我们创建了Eureka Server实例。本篇文章我们把用户服务和电影服务注册到Eureka Server上。（服务消费者和服务提供者）

  首先我们以注册用户服务为整个讲述核心

  注册文档，SpringCloud官网，我们定位到How to Include Eureka Client，跟着文档一步一步来。

一.基本注册

1.How to Include Eureka Client

  在用户服务的POM.xml 中加入依赖

		<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency>

2.Registering with Eureka

package com.dynamic.cloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
@EnableEurekaClient
public class MicroserviceSimpleProviderUserApplication {public static void main(String[] args) {SpringApplication.run(MicroserviceSimpleProviderUserApplication.class, args);}
}

3.在application.yml中加入Eureka的地址

eureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/

  至此基本的服务注册就已经完成了，我们的服务已经成功的注册在了Erueka上面。我们启动Eureka，并启动用户服务，可以观察到，注册在Eureka上面的服务实例。

  但是上面Application和Status有些问题。应用名称是未知，状态是电脑的名字。我们可以通过配置，进行定制，设置应用名称和将状态修改为主机+ 端口。

二.配置Application和Status

  在用户服务的application.yml配置文件中那个进行配置。

1.配置Application的名称

2.配置Status

重启服务，查看。

三.为Eureka Server进行认证；

1.配置Eureka服务的application.yml

2.在Eureka服务的POM.xml中添加依赖

		    <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency>

3.Eureka增加了认证，那么服务在注册的使用，也就需要访问认证的Eureka。所以需要修改用户的请求方式，修改用户服务的Application.yml文件。

四. 监控和管理生产环境

在用户服务的POM.xml中加入依赖

		<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-actuator</artifactId></dependency>

五. Eureka’s Health Checks （健康检查）

在Eureka项目的application.yml中添加配置；

六. Using the EurekaClient

在用户微服务的Controller中加入：

ServiceId = Spring.application.name

我们不但将用户服务注册到了Eureka Server中，并进行了Application配置，同时对Eureka进行了认证和使用。

同样的方式把电影微服务注册到Eureka中

1.修改application.yml配置文件

2.在启动类上加入注解@EnableEurekaClient

3.加入相关依赖。

启动Eureka，用户服务和电影服务。

代码展示：

Eureka

application.yml配置文件

server:port: 8761 #Eurake
eureka:client:healthcheck: enabled: trueregister-with-eureka: falsefetch-registry: falseservice-url:defaultZone: http://user:pass123@localhost:8761/eureka #把Eureka註冊到那個Eurekasecurity:basic:enabled: trueuser: name: user #login usernamepassword: pass123

POM.xml

<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><artifactId>microservice-discovery-eureka</artifactId><packaging>jar</packaging><parent><groupId>com.dynamic.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</version><relativePath/> </parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka-server</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency></dependencies></project>

用户微服务：

application.yml

server:port: 7900
spring:jpa:generate-ddl: falseshow-sql: truehibernate:ddl-auto: nonedatasource:platform: h2schema: classpath:schema.sql  #建表语句data: classpath:data.sql #数据application: name: microservice-provider-user #使用小写logging:level:root: INFOorg.hibernate: INFOorg.hibernate.type.descriptor.sql.BasicBinder: TRACEorg.hibernate.type.descriptor.sql.BasicExtractor: TRACEcom.dynamic: DEBUG
eureka:client:serviceUrl:defaultZone: http://user:pass123@localhost:8761/eurekainstance:prefer-ip-address: trueinstance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

启动类

package com.dynamic.cloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
@EnableEurekaClient
public class MicroserviceSimpleProviderUserApplication {public static void main(String[] args) {SpringApplication.run(MicroserviceSimpleProviderUserApplication.class, args);}
}

Controller

package com.dynamic.cloud.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;import com.dynamic.cloud.entity.User;
import com.dynamic.cloud.repository.UserRepository;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.EurekaClient;
import org.springframework.cloud.client.discovery.DiscoveryClient;@RestController
public class UserController
{@Autowiredprivate UserRepository userRepository;@GetMapping("/simple/{id}")public User findById(@PathVariable Long id){return this.userRepository.findById(id);}@Autowiredprivate EurekaClient eurekaClient;@GetMapping("/eureka-instance")public String serviceUrl() {InstanceInfo instance = eurekaClient.getNextServerFromEureka("MICROSERVICE-PROVIDER-USER", false);return instance.getHomePageUrl();}@Autowiredprivate DiscoveryClient discoveryClient;@GetMapping("/instance-info")public ServiceInstance showInfo(){ServiceInstance localServiceInstance = this.discoveryClient.getLocalServiceInstance();return localServiceInstance;}}

电影微服务类比用户微服务，进行修改。

application.yml

server:port: 7901user: userServicePath: http://localhost:7900/simple/spring:application:name: microservice-comsumer-movieeureka:client:serviceUrl:defaultZone: http://user:pass123@localhost:8761/eurekainstance: prefer-ip-address: trueinstance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

POM.xml

<?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><artifactId>microservice-comsumer-movie</artifactId><packaging>jar</packaging><parent><groupId>com.dynamic.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-actuator</artifactId></dependency></dependencies>
</project>

启动类加上注解：@EnableEurekaClient

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