go开发过程中mapstructure使用示例详解

go get github.com/mitchellh/mapstructure

package main
import (
    "fmt"
    "github.com/mitchellh/mapstructure"
)
type Config struct {
    Name    string `mapstructure:"name"`    // 使用标签指定映射的字段
    Version string `mapstructure:"version"`
    Port    int    `mapstructure:"port"`
}

func main() {
    // 创建一个 map
    configMap := map[string]interface{}{
        "name":    "MyApp",
        "version": "1.0.0",
        "port":    8080,
    }
    var config Config
    // 解码 map 到结构体
    err := mapstructure.Decode(configMap, &config)
    if err != nil {
        fmt.Println("Error decoding:", err)
        return
    }
    // 输出结果
    fmt.Printf("Config: %+v\n", config)
}

type DatabaseConfig struct {
    Host string `mapstructure:"host"`
    Port int    `mapstructure:"port"`
}
type Config struct {
    Name       string         `mapstructure:"name"`
    Version    string         `mapstructure:"version"`
    Port       int            `mapstructure:"port"`
    Database   DatabaseConfig `mapstructure:"database"` // 嵌套结构体
}

func main() {
    configMap := map[string]interface{}{
        "name":    "MyApp",
        "version": "1.0.0",
        "port":    8080,
        "database": map[string]interface{}{ // 嵌套的 map
            "host": "localhost",
            "port": 5432,
        },
    }
    var config Config
    err := mapstructure.Decode(configMap, &config)
    if err != nil {
        fmt.Println("Error decoding:", err)
        return
    }
    fmt.Printf("Config: %+v\n", config)
    fmt.Printf("Database Host: %s, Port: %d\n", config.Database.Host, config.Database.Port)
}