上文docker安装nacos我们已经安装了nacos,现在我们来看看如何读取配置文件。我们的nacos的示例采用和 go读取consul配置文件 一致：

 

go我这里采用 https://github.com/nacos-group/nacos-sdk-go 客户端， 直接上上代码：

package main

import (
    "fmt"
    "log"
    "strings"
    "time"

    "github.com/nacos-group/nacos-sdk-go/clients"
    "github.com/nacos-group/nacos-sdk-go/common/constant"
    "github.com/nacos-group/nacos-sdk-go/vo"
    "github.com/spf13/viper"
)

var (
    defaultConfig *viper.Viper
    nacosIp       string
    nacosPort     uint64
    nacosDataId   string
    nacosGroup    string
)

func initConfig() *viper.Viper {
    nacosIp = "192.168.100.21"
    nacosPort = 8848
    nacosDataId = "dev001"
    nacosGroup = "go"

    defaultConfig = viper.New()
    defaultConfig.SetConfigType("yaml")
    //配置模型
    serverConfigs := []constant.ServerConfig{
        {IpAddr: nacosIp, Port: nacosPort},
    }

    //客户端
    nacosClient, err := clients.NewConfigClient(
        vo.NacosClientParam{
            ClientConfig:  &constant.ClientConfig{TimeoutMs: 5000},
            ServerConfigs: serverConfigs,
        },
    )
    if err != nil {
        log.Fatal("nacos初始化错误:", err)
    }

    content, err := nacosClient.GetConfig(vo.ConfigParam{DataId: nacosDataId, Group: nacosGroup})
    if err != nil {
        log.Fatalln("nacos读取配置错误:" + content)
    }

    err = defaultConfig.ReadConfig(strings.NewReader(content))
    if err != nil {
        log.Fatalln("Viper解析配置失败:", err)
    }

    go func() {
        time.Sleep(time.Second * 10)
        err = nacosClient.ListenConfig(vo.ConfigParam{
            DataId: nacosDataId,
            Group:  nacosGroup,
            OnChange: func(namespace, group, dataId, data string) {
                fmt.Println("config changed group:" + group + ", dataId:" + dataId + ", content:" + data)
                err = defaultConfig.ReadConfig(strings.NewReader(data))
                if err != nil {
                    log.Fatalln("Viper解析配置失败:", err)
                }
            },
        })
    }()

    return defaultConfig
}

func GetConfig() *viper.Viper {
    if defaultConfig == nil {
        defaultConfig = initConfig()
    }
    return defaultConfig
}

func main() {
    for {
        host := GetConfig().GetString("store.bicycle.color")
        fmt.Println("consul===", host)
        time.Sleep(time.Second * 10)
    }
}

运行效果：