前言

搭建一个SpringBoot+Dubbo+Nacos的demo，以Dubbo作为远程调用协议，以Nacos作为Dubbo服务的注册中心和配置中心

一、环境准备

JDK	Nacos	SpringBoot	Dubbo
jdk-8u211	2.2.5.RELEASE	2.3.6.RELEASE	2.7.7

1.Nacos配置单节点启动

1.1 start.cmd配置文件修改

1.2 命令行单节点启动

startup.cmd -m standalone

1.3 Nacos持久化配置

二、项目结构

项目使用Maven构建，使用IntelliJ IDEA 2022.1.4开发，并没有使用Consumer和Provider形式去搭建，而是在SpringCloud环境下搭建的微服务模式，只是为测试Nacos注册中心的功能

Maven依赖

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    <version>2.2.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <version>2.2.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>2.7.7</version>
</dependency>
<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-registry-nacos</artifactId>
    <version>2.7.7</version>
</dependency>

bootstrap.yml

server:
  port: 8085
nacos:
  service-address: 127.0.0.1
  port: 8848
spring:
  profiles:
    active: dev
  application:
    name: spring-nacos
  cloud:
    nacos:
      discovery:
        server-addr: ${nacos.service-address}:${nacos.port}
      config:
        server-addr: ${nacos.service-address}:${nacos.port}
        file-extension: yaml
        group: DEV_GROUP
        namespace: 4485c917-2a40-41ed-81b1-8e6ae2a56e4c
        prefix: ${spring.profiles.active}
        refresh-enabled: true

Nacos配置dev.yml

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/study?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT
    username: root
    password: root
mybatis-plus:
  mapper-locations: classpath:/mapper/*.xml
  type-aliases-package: com.zhangjiang.mapper
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
dubbo:
  application:
    name: spring-nacos
  protocol:
    name: dubbo
    port: 20880
  registry:
    id: nacos-registry
    address: nacos://127.0.0.1:8848
  config-center:
    address: nacos://127.0.0.1:8848
  metadata-report:
    address: nacos://127.0.0.1:8848

三、接口代码实现

项目主启动类

Dubbo2.7.7版本提供了@EnableDubbo注解来用于和Spring的整合，而真正起作用的是@EnableDubboConfig和@DubboComponentScan这两个注解，主要作用是初始化Dubbo核心组件，加载Dubbo配置到内存中；注册BeanPostProccessor,用来扫描@DubboService注解（2.7.7之后的）

@SpringBootApplication
@EnableDiscoveryClient
@EnableDubbo(scanBasePackages = "com.zhangjiang.service")
@MapperScan(basePackages = "com.zhangjiang.mapper")
public class SpringNacosApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringNacosApplication.class, args);
    }
}