eureka是什么？

eureka是netflix开的的一套服务发现框架。在框架中的主要核心角色有，服务发现，服务注册和服务提供。

eureka服务集群搭建

1.项目结构

2. 新建父级项目，父级项目pom文件，版本统一

<?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>com.xx.job</groupId>
  <artifactId>spring-cloud-demo</artifactId>
  <packaging>pom</packaging>
  <version>1.0-SNAPSHOT</version>
  <modules>
    <module>spring-cloud-payment8081</module>
      <module>order-consumer80</module>
      <module>cloud-common</module>
    <module>eureka-server7001</module>
      <module>eureka-server7002</module>
      <module>spring-cloud-payment8082</module>
  </modules>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <spring.version>2.3.3.RELEASE</spring.version>
    <springCloud.version>Hoxton.SR12</springCloud.version>
    <mysql.version>5.1.47</mysql.version>
    <mybatis.version>2.0.6</mybatis.version>
    <druid.version>1.2.6</druid.version>
    <lombak.veraion>1.18.20</lombak.veraion>
    <project.version>1.0-SNAPSHOT</project.version>
    <eureka.version>2.2.6.RELEASE</eureka.version>
  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>${spring.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${springCloud.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>${mybatis.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${druid.version}</version>
      </dependency>
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${lombak.veraion}</version>
        <scope>provided</scope>
      </dependency>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        <version>${eureka.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        <version>${eureka.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>


    </dependencies>
  </dependencyManagement>
</project>

2.新建eureka注册中心（eureka-server7001），注册中心pom

<?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>spring-cloud-demo</artifactId>
        <groupId>com.xx.job</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>eureka-server7001</artifactId>

    <name>eureka-server7001</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </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-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
</project>

3.注册中心yml文件配置

server:
  port: 7001

spring:
  application:
    name: eureka-server7001

eureka:
  instance:
    hostname: localhost #eureka服务端实例名称

  client:
    # false表示不向注册中心注册自己
    register-with-eureka: true
    # false 表示自己就是注册中心，我的职责是给你的维护服务实例，并不需要去检索服务
    fetch-registry: false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:7002/eureka/

4.注册中心启动类

@SpringBootApplication
@EnableEurekaServer //注册中心注解
public class EurekaServer7001 {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer7001.class,args);
    }
}

5.启动之后，访问127.0.0.1:7001出现以下页面就是注册配置好了（多个注册中心配置相同，改一下端口号就好了）。

 6.eureka注册中心配置注意点：如果我们有多个注册中心，要向其它注册中心注册自己例如：

我有三个注册中心，7001，7002，7003。7002要向7001和7003注册自己，只需要在defaultZone属性中添加相应的地址就可以了。

    service-url:
      defaultZone: http://localhost:7001/eureka,http://localhost:7003/eureka

eureka服务提供者搭建

1.新建maven项目（spring-cloud-payment8081），pom文件

<?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>spring-cloud-demo</artifactId>
        <groupId>com.xx.job</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>spring-cloud-payment8081</artifactId>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.xx.job</groupId>
            <artifactId>cloud-common</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </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>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>


</project>

2.写yml文件

server:
  port: 8081

spring:
  application:
    name: spring-cloud-payment
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://127.0.0.1:3306/spring-cloud?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8


eureka:
  instance:
    instance-id: spring-cloud-payment8001
  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，默认为毛白前，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
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka,http://localhost:7002/eureka

mybatis:
  type-aliases-package: com.xx.job.entity # xml匹配包
  mapper-locations: classpath:mapper/*.xml # xml放的位置

3.编写启动类-----然后启动

@EnableEurekaClient // eureka客户端注解
@SpringBootApplication
public class SpringCloudDemo8081 {

    public static void main(String[] args) {
        SpringApplication.run(SpringCloudDemo8081.class,args);
    }
}

4.刷新7001注册中心我们可以看到多了一个应用

5.多个服务提供者，基本相同改一下端口号就可以。其中的业务代码可以自己写，跟平常的springboot一样。 

服务消费方项目搭建

1.新建项目（order-consumer80）,pom文件

<?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>spring-cloud-demo</artifactId>
        <groupId>com.xx.job</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>order-consumer80</artifactId>
    <name>order-consumer80</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.xx.job</groupId>
            <artifactId>cloud-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>


</project>

2.yml文件编写

server:
  port: 81
spring:
  application:
    name: order-consumer80
eureka:
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka,http://localhost:7002/eureka

3.启动类编写 

@EnableDiscoveryClient
@EnableEurekaClient
@SpringBootApplication
public class OrderConsumer80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderConsumer80.class,args);
    }
}

4.服务消费方有一点不同，我们需要调用服务提供者的接口。  我们这里使用RestTemplate进行服务调用，所以要向spring容器中注入RestTemplate。代码：

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 ApplicationConfig {

    @Bean
    @LoadBalanced // 多个服务提供者可以轮询调用
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }

}

5.客户端控制层代码

import com.xx.job.common.CommonResult;
import com.xx.job.entity.Payment;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController
@RequestMapping("/consumer")
public class ConsumerController {

    public static final String URI = "http://SPRING-CLOUD-PAYMENT";

    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private DiscoveryClient discoveryClient;

    @GetMapping("/selectById/{id}")
    public CommonResult selectById(@PathVariable Long id){
        ResponseEntity<CommonResult> forEntity = restTemplate.getForEntity(URI + "/payment/selectById/" + id, CommonResult.class);
        CommonResult body = forEntity.getBody();
        return body;
    }

    @GetMapping("/insert")
    public CommonResult insert( Payment payment){
        ResponseEntity<CommonResult> forEntity = restTemplate.postForEntity(URI + "/payment/insert", payment, CommonResult.class);
        return forEntity.getBody();
    }

    @GetMapping("/discovery")
    public Object discoveryClient(){
        List<String> services = discoveryClient.getServices();
        services.forEach(x->{
            System.out.println(x);
        });

        List<ServiceInstance> instances = discoveryClient.getInstances("SPRING-CLOUD-PAYMENT");
        instances.forEach(x->{
            System.out.println(x.getHost());
            System.out.println(x.getInstanceId());
            System.out.println(x.getPort());
            System.out.println(x.getServiceId());
            System.out.println(x.getUri());
            System.out.println(x.getMetadata());
            System.out.println(x.getScheme());
            System.out.println("------------------------");
        });

        return discoveryClient;
    }
}

6.启动服务消费者。在eureka初始页面看到就加一个应用就成功了。

git地址：spring-cloud-demo: spring-cloud-demo试例

# eureka # spring cloud # spring
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