创建工程study_config测试nacos配置中心-马育民老师

# 创建工程

参见：
https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_nacos_config

[![](https://www.malaoshi.top/upload/pic/nacos/20200624153402.png)](https://www.malaoshi.top/upload/pic/nacos/20200624153402.png)

# 添加依赖

修改pom.xml文件

```
<dependencies>
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
```

# 添加 bootstrap.yml 配置文件

**注意：** 当从nacos配置中心拉取配置时，要用 `bootstrap.yml` 配置文件，参见：
https://www.malaoshi.top/show_1EF5lbJAdbGe.html

在 `resources` 文件夹创建`bootstrap.yml`配置文件

```

server:
  port: 9100

spring:
  application:
    name: study-config
  cloud:
    nacos:
      discovery:   # 注册
        server-addr: 106.13.165.100:8848

config:   # 配置中心
        server-addr: 106.13.165.100:8848
        file-extension: yml

profiles:
    active: dev   # 拉取dev配置文件
```

**注意：**

- `name: study-config`不能改变，与`Data ID`相关，原因会在后面讲
- `active: dev`不能改变，与`Data ID`相关，原因会在后面讲

# 创建主启动类

```
package top.malaoshi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class ConfigMain {
    public static void main(String[] args) {
        SpringApplication.run(ConfigMain.class,args);
    }
}
```

# 测试controller

```
package top.malaoshi.controller;

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

@RestController
@RefreshScope //支持Nacos的动态刷新功能
public class TestCtrl {

@Value("${db.name}")
    private String name;

@Value("${db.pwd}")
    private String pwd;

@GetMapping("/test")
    public String test(){
        return name+"--"+pwd;
    }

}
```

##### 解释

- `@Value("${db.name}")`：从nacos获取的配置

- `@Value("${db.pwd}")`：从nacos获取的配置

### 自动更新 `@RefreshScope`

`@RefreshScope`：支持Nacos的动态刷新功能

# nacos添加配置

第一步：

[![](https://www.malaoshi.top/upload/pic/nacos/20200624175354.png)](https://www.malaoshi.top/upload/pic/nacos/20200624175354.png)

第二步：

[![](https://www.malaoshi.top/upload/pic/nacos/20200624175314.png)](https://www.malaoshi.top/upload/pic/nacos/20200624175314.png)

**注意：** 这里的 `Data ID`不能改变，与上面`study-config`和`dev`相关，原因会在后面讲

点击【发布】，如下图：
[![](https://www.malaoshi.top/upload/pic/nacos/20200624214945.png)](https://www.malaoshi.top/upload/pic/nacos/20200624214945.png)

# 测试

访问 http://localhost:9100/test 可以在网页上看到 信息，该信息是从nacos拉取下来的

原文出处：/show_1EF5ld8WvUVp.html