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。

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>

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