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4、服务注册&服务提供者

1、什么是服务提供者

服务提供者（Service Provider）：是指服务的被调用方（即：为其它服务提供服务的服务）；服务提供者，作为一个Eureka Client，向Eureka Server做服务注册、续约和下线等操作，注册的主要数据包括服务名、机器ip、端口号、域名等等。

4、服务注册&服务提供者

从图中可以到Eureka 有两种服务实例，分别为Eureka Server和Eureka Client；而且Eureka Client又分为两种类型：Service Provider（服务提供者）和Service Consumer（服务消费者），如果学过dubbo发现这个图跟dubbo的调用关系图比较类似。

2、新建meven项目

<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>spring-cloud</groupId>
    <artifactId>sc-eureka-client-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-eureka-client-provider</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <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>
    </properties>

    <dependencies>
        <!-- 说明是一个 eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.0.1.RELEASE</version>
        </dependency>

        <!-- spring boot实现Java Web服务 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- 把tomcat-jdbc连接池排除掉，这样spring-boot就会寻找是否有HikariCP可用 -->
            <exclusions>
                <exclusion>
                    <groupId>org.apache.tomcat</groupId>
                    <artifactId>tomcat-jdbc</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.3</version>
        </dependency>


        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

    </dependencies>
</project>

4、服务注册&服务提供者

3、创建ProviderApplication.java类

package sc.provider;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@MapperScan(basePackages="sc.provider.dao")
public class ProviderApplication {

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

Mybatis的注解MapperScan扫描mapper文件所在的包

4、创建application.yml文件

server:
  port: 8200

spring:
  application:
    name: sc-eureka-client-provider
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/sc?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8
    username: root
    password: root
    type: com.zaxxer.hikari.HikariDataSource
    hikari:
      minimum-idle: 5
      maximum-pool-size: 15
      auto-commit: true
      idle-timeout: 30000
      pool-name: DatebookHikariCP
      max-lifetime: 1800000
      connection-timeout: 30000
      connection-test-query: SELECT 1
 
eureka:
  client:
    registerWithEureka: true #是否将自己注册到Eureka服务中，默认为true
    fetchRegistry: true #是否从Eureka中获取注册信息，默认为true
    serviceUrl:
      defaultZone: http://localhost:5001/eureka/

mybatis:
  mapperLocations: classpath:sc/provider/dao/*.xml
  #configLocation: classpath:mybatis-config.xml

Spring Cloud 2.x以后默认使用Hikari数据源，一个非常高效的数据源。

5、其他需要创建的相关类请看下面

4、服务注册&服务提供者