Spring Cloud Alibaba（2）使用nacos作为配置中心带源码

深藏阁楼爱情的钟 2022-03-08 09:08 179阅读 0赞

**目录**

1. nacos作为配置中心

2.项目介绍：

3.源码地址：

4.搭建nacos-config

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## 1. **nacos作为配置中心** ##

可以动态的刷新配置属性的值；

## 2.项目介绍： ##

nacos-config配置中心，使用nacos0.9.0+spring boot2.x

## **3.源码地址**： ##

[https://gitee.com/acelee723/acelee-SpringCloudAlibaba-nacosDemo][https_gitee.com_acelee723_acelee-SpringCloudAlibaba-nacosDemo]

--------------------

## 4.**搭建nacos-config** ##

1）pom添加依赖

<?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">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.3.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.acelee</groupId>
        <artifactId>nacos-config</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>nacos-config</name>
        <description>Demo project for nacos -config</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>com.alibaba.boot</groupId>
                <artifactId>nacos-config-spring-boot-starter</artifactId>
                <version>0.2.1</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

2）application.properties增加属性

server.port=8890
    
    spring.application.name=nacos-config
    nacos.config.server-addr=127.0.0.1:8848

3）启动类增加@NacosPropertySource(dataId = "nacos-config", autoRefreshed = true)

>  *  加载 `dataId` 为 nacos-config 的配置源，并开启自动更新：

package com.acelee.config;
    
    import com.alibaba.nacos.spring.context.annotation.config.NacosPropertySource;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    @NacosPropertySource(dataId = "nacos-config", autoRefreshed = true)
    public class NacosConfigApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(NacosConfigApplication.class, args);
        }
    
    }

4）新增controller包，下面新增ConfigController类

>  *  使用Nacos 的 `@NacosValue` 注解设置属性值，并开启自动刷新。

package com.acelee.config.controller;
    
    import com.alibaba.nacos.api.config.annotation.NacosValue;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @Auther: Ace Lee
     * @Date: 2019/3/14 19:09
     */
    @RestController
    public class ConfigController {
    
        @NacosValue(value = "${nacos.test.property:123}", autoRefreshed = true)
        private String testProperties;
    
        @GetMapping("/test")
        public String test(){
            return testProperties;
        }
    }

5）启动config工程，访问[http://localhost:8890/test][http_localhost_8890_test]返回：123

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhczcyMw_size_16_color_FFFFFF_t_70][]

![20190314202025152.png][]

6）打开Nacos--“配置管理”--“配置列表”，点击+新建配置，配置完毕后，点击右下角蓝色“发布”按钮。

>  *  Data Id：保持和启动类的dataId一致。
>  *  配置内容：属性名称和测试类里的NacosValue里的value名称一致。=多少随便填写。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhczcyMw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhczcyMw_size_16_color_FFFFFF_t_70 2][]

7）再次访问 [http://localhost:8890/test][http_localhost_8890_test]返回：456

>  *  证明属性nacos.test.property的值由123动态刷新为456

![20190314202952484.png][]

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[https_gitee.com_acelee723_acelee-SpringCloudAlibaba-nacosDemo]: https://gitee.com/acelee723/acelee-SpringCloudAlibaba-nacosDemo
[http_localhost_8890_test]: http://localhost:8890/test
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhczcyMw_size_16_color_FFFFFF_t_70]: /images/20220308/e846431920e24cf3aaa929df506e8959.png
[20190314202025152.png]: /images/20220308/0f0da997af6a4155968768c24d953fba.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhczcyMw_size_16_color_FFFFFF_t_70 1]: /images/20220308/24dd2d9b5898489f9dc78722104ede46.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xhczcyMw_size_16_color_FFFFFF_t_70 2]: /images/20220308/5662513105d3406cafd075ae5b113094.png
[20190314202952484.png]: /images/20220308/067e9fd688254eb9b3b5e0d8ce128230.png
[spring cloud alibaba]: https://blog.csdn.net/las723/column/info/38747