115 lines
2.4 KiB
Markdown
115 lines
2.4 KiB
Markdown
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### TOML 简介
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TOML（Tom's Obvious, Minimal Language）是一种配置文件格式，旨在易于阅读和编写。它的语法类似于INI文件，但更强大和灵活。
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#### 基本语法
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1. **键值对**：
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```toml
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key = "value"
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```
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2. **字符串**：
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```toml
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string = "Hello, World!"
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multi_line_string = """
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This is a
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multi-line string.
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"""
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```
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3. **数字**：
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```toml
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integer = 42
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float = 3.14
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```
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4. **布尔值**：
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```toml
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boolean = true
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```
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5. **数组**：
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```toml
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array = [1, 2, 3]
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```
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6. **表（嵌套结构）**：
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```toml
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[table]
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key = "value"
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```
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7. **数组表**：
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```toml
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[[array_table]]
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name = "Alice"
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[[array_table]]
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name = "Bob"
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```
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### 使用 Go 的 Viper 解析 TOML
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在go中，有很多的库可以解析Toml,在这里我推荐使用Viper来进行处理。Viper 是一个强大的 Go 库，用于处理配置文件，支持多种格式，不仅仅是TOML。
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#### 示例代码
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1. **创建 TOML 文件**（`config.toml`）：
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```toml
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app_name = "Class"
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port = 8080
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[database]
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host = "localhost"
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port = 3306
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user = "yzk_study"
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password = "yzk722923"
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```
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2. **使用 Viper 解析 TOML**：
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```go
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package main
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import (
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"fmt"
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"github.com/spf13/viper"
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)
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func main() {
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// 设置配置文件名和路径
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viper.SetConfigName("config") // 文件名（不带扩展名）
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viper.SetConfigType("toml") // 文件类型
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viper.AddConfigPath(".") // 查找路径
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// 读取配置文件
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if err := viper.ReadInConfig(); err != nil {
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panic(fmt.Errorf("Fatal error config file: %s \n", err))
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}
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// 获取配置值
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appName := viper.GetString("app_name")
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port := viper.GetInt("port")
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dbHost := viper.GetString("database.host")
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dbPort := viper.GetInt("database.port")
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fmt.Printf("App Name: %s\n", appName)
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fmt.Printf("Port: %d\n", port)
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fmt.Printf("Database Host: %s\n", dbHost)
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fmt.Printf("Database Port: %d\n", dbPort)
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}
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```
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#### 运行结果
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```bash
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App Name: MyApp
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Port: 8080
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Database Host: localhost
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Database Port: 5432
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```
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### 总结
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- **TOML** 是一种易于阅读和编写的配置文件格式。
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- **Viper** 是一个强大的 Go 库，支持多种配置文件格式，包括 TOML。
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- 通过 Viper，可以轻松读取和解析 TOML 文件中的配置项。
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