Golang如何操作JSON文件_Golang encoding/json文件读写实践

{
  "name": "Alice",
  "age": 30,
  "active": true,
  "tags": ["developer", "go", "backend"]
}

package main

import (
	"encoding/json"
	"io/ioutil"
	"log"
)

type Config struct {
	Name   string   `json:"name"`
	Age    int      `json:"age"`
	Active bool     `json:"active"`
	Tags   []string `json:"tags"`
}

func readJSON() {
	data, err := ioutil.ReadFile("config.json")
	if err != nil {
		log.Fatalf("读取文件失败: %v", err)
	}

	var config Config
	err = json.Unmarshal(data, &config)
	if err != nil {
		log.Fatalf("解析JSON失败: %v", err)
	}

	<strong>log.Printf("读取结果: %+v", config)</strong>
}

func writeJSON() {
	config := Config{
		Name:   "Bob",
		Age:    25,
		Active: false,
		Tags:   []string{"tester", "qa"},
	}

	// 使用 MarshalIndent 生成格式化JSON
	data, err := json.MarshalIndent(config, "", "  ")
	if err != nil {
		log.Fatalf("序列化失败: %v", err)
	}

	err = ioutil.WriteFile("output.json", data, 0644)
	if err != nil {
		log.Fatalf("写入文件失败: %v", err)
	}

	<strong>log.Println("JSON文件写入成功")</strong>
}

func readDynamicJSON() {
	data, err := ioutil.ReadFile("config.json")
	if err != nil {
		log.Fatal(err)
	}

	var raw map[string]interface{}
	err = json.Unmarshal(data, &raw)
	if err != nil {
		log.Fatal(err)
	}

	<strong>for k, v := range raw {
		log.Printf("%s: %v (%T)", k, v, v)
	}</strong>
}

func main() {
	readJSON()
	writeJSON()
}