SpringBoot 集成Nacos注册中心和配置中心-支持自动刷新配置

本文介绍SpringBoot项目集成Nacos注册中心和配置中心的步骤，供各位参考使用

1、配置pom.xml 文件

在pom.xml文件中定义如下配置和引用依赖，如下所示：

<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>
    <spring.cloud.starter.alibaba.version>2021.0.5.0</spring.cloud.starter.alibaba.version>
    <spring.cloud.dependencies.version>2021.0.5</spring.cloud.dependencies.version>
    <spring.boot.version>2.6.13</spring.boot.version>
</properties>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring.cloud.dependencies.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${spring.cloud.starter.alibaba.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <version>${spring.cloud.starter.alibaba.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>${spring.boot.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
    <!-- 引入springboot web模块的依赖 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- 引入 Spring Cloud Alibaba Nacos Discovery 相关依赖，将 Nacos 作为注册中心，并实现对其的自动配置 -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    <!-- 引入使用nacos作为配置中心的依赖 BEGIN -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-bootstrap</artifactId>
    </dependency>
    <!-- 引入使用nacos作为配置中心的依赖 END -->
</dependencies>

2、修改bootstrap.properties配置文件

删除resources目录下的application.properties 或者application.ymal 文件，新增或修改bootstrap.properties文件，内容如下

spring.application.name=service-provider
# 注册中心相关配置
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.discovery.service=${spring.application.name}
spring.cloud.nacos.discovery.namespace=dev

# 配置中心相关配置
spring.cloud.nacos.config.enabled=true
spring.cloud.nacos.config.server-addr=127.0.0.1:8848
spring.cloud.nacos.config.group=DEFAULT_GROUP
spring.cloud.nacos.config.namespace=dev
spring.cloud.nacos.config.name=${spring.application.name}

3、编写ProviderController验证

编写一个ProviderController验证是否成功，@RefreshScope注解表示支持自动刷新配置，代码如下：

package com.iambest.study.provider.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RefreshScope
@RestController
public class ProviderController {

    @Value("${name}")
    String name;

    @RequestMapping(value = "/index", method = RequestMethod.GET)
    public String index() {
        return "Hello world:" + name;
    }

}