SpringCloud微服务实战——搭建企业级开发框架（九）：使用Nacos发现、配置和管理微服务
Nacos是一个更易于构建云原生应用的动态服务发现、配置管理和服务管理平台，Nacos 致力于帮助您发现、配置和管理微服务。Nacos 提供了一组简单易用的特性集，帮助您快速实现动态服务发现、服务配置、服务元数据及流量管理。
1、跟之前新建SpringBoot自定义扩展一样，我们在GitEgg_Platform中新建gitegg-platform-cloud子工程，此工程主要用于Spring Cloud相关功能的自定义及扩展。
2、在GitEgg_Platform中的gitegg-platform-bom子工程添加SpringCloud Alibaba的依赖
<!--?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>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-parent</artifactid>
<version>2.3.3.RELEASE</version>
<relativepath>
</relativepath></parent>
<modelversion>4.0.0</modelversion>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-bom</artifactid>
<name>${project.artifactId}</name>
<version>${gitegg.project.version}</version>
<packaging>pom</packaging>
<properties>
<!-- jdk版本1.8 -->
<java.version>1.8</java.version>
<!-- maven-compiler-plugin插件版本，Java代码编译 -->
<maven.plugin.version>3.8.1</maven.plugin.version>
<!-- maven编译时指定编码UTF-8 -->
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
<!-- 项目统一字符集编码UTF-8 -->
<project.build.sourceencoding>UTF-8</project.build.sourceencoding>
<!-- 项目统一字符集编码UTF-8 -->
<project.reporting.outputencoding>UTF-8</project.reporting.outputencoding>
<!-- GitEgg项目统一设置版本号 -->
<gitegg.project.version>1.0-SNAPSHOT</gitegg.project.version>
<!-- mysql数据库驱动 -->
<mysql.connector.version>8.0.17</mysql.connector.version>
<!-- postgresql数据库驱动 -->
<postgresql.connector.version>9.1-901.jdbc4</postgresql.connector.version>
<!-- 数据库连接池Druid -->
<druid.version>1.1.23</druid.version>
<!-- Mybatis Plus增强工具 -->
<mybatis.plus.version>3.4.0</mybatis.plus.version>
<!-- Knife4j Swagger2文档 -->
<knife4j.version>3.0.1</knife4j.version>
<!-- Spring Cloud Alibaba -->
<spring.cloud.alibaba>2.2.3.RELEASE</spring.cloud.alibaba>
</properties>
<dependencymanagement>
<dependencies>
<!-- gitegg数据库驱动及连接池 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-db</artifactid>
<version>${gitegg.project.version}</version>
</dependency>
<!-- gitegg mybatis-plus -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-mybatis</artifactid>
<version>${gitegg.project.version}</version>
</dependency>
<!-- gitegg swagger2-knife4j -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-swagger</artifactid>
<version>${gitegg.project.version}</version>
</dependency>
<!-- gitegg boot自定义扩展 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-boot</artifactid>
<version>${gitegg.project.version}</version>
</dependency>
<!-- gitegg cloud自定义扩展 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-cloud</artifactid>
<version>${gitegg.project.version}</version>
</dependency>
<!-- mysql数据库驱动 -->
<dependency>
<groupid>mysql</groupid>
<artifactid>mysql-connector-java</artifactid>
<version>${mysql.connector.version}</version>
</dependency>
<!-- postgresql数据库驱动 -->
<dependency>
<groupid>postgresql</groupid>
<artifactid>postgresql</artifactid>
<version>${postgresql.connector.version}</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupid>com.alibaba</groupid>
<artifactid>druid-spring-boot-starter</artifactid>
<version>${druid.version}</version>
</dependency>
<!-- Mybatis Plus增强工具 -->
<dependency>
<groupid>com.baomidou</groupid>
<artifactid>mybatis-plus-boot-starter</artifactid>
<version>${mybatis.plus.version}</version>
</dependency>
<!-- Swagger2 knife4j bom方式引入 -->
<dependency>
<groupid>com.github.xiaoymin</groupid>
<artifactid>knife4j-dependencies</artifactid>
<version>${knife4j.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- Spring Cloud Alibaba -->
<dependency>
<groupid>com.alibaba.cloud</groupid>
<artifactid>spring-cloud-alibaba-dependencies</artifactid>
<version>${spring.cloud.alibaba}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencymanagement>
</project>3、在gitegg-platform-cloud工程中引入spring-cloud-starter-alibaba-nacos-discovery
<!--?xml version="1.0" encoding="UTF-8"?-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactid>GitEgg-Platform</artifactid>
<groupid>com.gitegg.platform</groupid>
<version>1.0-SNAPSHOT</version>
</parent>
<modelversion>4.0.0</modelversion>
<artifactid>gitegg-platform-cloud</artifactid>
<name>${project.artifactId}</name>
<version>${project.parent.version}</version>
<packaging>jar</packaging>
<dependencies>
<!-- Nacos 服务注册发现-->
<dependency>
<groupid>com.alibaba.cloud</groupid>
<artifactid>spring-cloud-starter-alibaba-nacos-discovery</artifactid>
</dependency>
</dependencies>
</project>4、GitEgg_Platform工程重新执行install，在GitEgg_Cloud的子工程gitegg-service中引入gitegg-platform-cloud
<!--?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>GitEgg-Cloud</artifactid>
<groupid>com.gitegg.cloud</groupid>
<version>1.0-SNAPSHOT</version>
</parent>
<modelversion>4.0.0</modelversion>
<artifactid>gitegg-service</artifactid>
<packaging>pom</packaging>
<modules>
<module>gitegg-service-base</module>
<module>gitegg-service-bigdata</module>
<module>gitegg-service-system</module>
</modules>
<dependencies>
<!-- gitegg Spring Boot自定义及扩展 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-boot</artifactid>
</dependency>
<!-- gitegg Spring Cloud自定义及扩展 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-cloud</artifactid>
</dependency>
<!-- gitegg数据库驱动及连接池 -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-db</artifactid>
</dependency>
<!-- gitegg mybatis-plus -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-mybatis</artifactid>
</dependency>
<!-- gitegg swagger2-knife4j -->
<dependency>
<groupid>com.gitegg.platform</groupid>
<artifactid>gitegg-platform-swagger</artifactid>
</dependency>
<!-- spring boot web核心包 -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-web</artifactid>
</dependency>
<!-- spring boot 健康监控 -->
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-actuator</artifactid>
</dependency>
</dependencies>
</project>5、修改application.yml文件，添加nacos配置：
server:
port: 8001
spring:
application:
name: gitegg-service-system
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
datasource:
type: com.alibaba.druid.pool.DruidDataSource
url: jdbc:mysql://127.0.0.1/gitegg_cloud?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: root
initialSize: 1
minIdle: 3
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
minEvictableIdleTimeMillis: 30000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 打开PSCache，并且指定每个连接上PSCache的大小
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
filters: config,stat,slf4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000;
# 合并多个DruidDataSource的监控数据
useGlobalDataSourceStat: true
mybatis-plus:
mapper-locations: classpath*:/com/gitegg/*/*/mapper/*Mapper.xml
typeAliasesPackage: com.gitegg.*.*.entity
global-config:
#主键类型 0:"数据库ID自增", 1:"用户输入ID",2:"全局唯一ID (数字类型唯一ID)", 3:"全局唯一ID UUID";
id-type: 2
#字段策略 0:"忽略判断",1:"非 NULL 判断"),2:"非空判断"
field-strategy: 2
#驼峰下划线转换
db-column-underline: true
#刷新mapper 调试神器
refresh-mapper: true
#数据库大写下划线转换
#capital-mode: true
#逻辑删除配置
logic-delete-value: 1
logic-not-delete-value: 0
configuration:
map-underscore-to-camel-case: true
cache-enabled: false6、修改GitEggSystemApplication.java添加注解@EnableDiscoveryClient,然后运行GitEggSystemApplication：
package com.gitegg.service.system;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.ComponentScan;
/**
* gitegg-system 启动类
*/
@EnableDiscoveryClient
@ComponentScan(basePackages = "com.gitegg")
@MapperScan("com.gitegg.*.*.mapper")
@SpringBootApplication
public class GitEggSystemApplication {
public static void main(String[] args) {
SpringApplication.run(GitEggSystemApplication.class,args);
}
}7、在浏览器中打开nacos的地址，点击左侧菜单的服务列表，可以查看到服务已经注册到nacos
本文源码在https://gitee.com/wmz1930/GitEgg 的chapter-09分支。
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