Golang如何写入JSON文件详解

package main

import (
    "encoding/json"
    "os"
)

type Person struct {
    Name  string `json:"name"`
    Age   int    `json:"age"`
    Email string `json:"email"`
}

func main() {
    person := Person{
        Name:  "Alice",
        Age:   30,
        Email: "alice@example.com",
    }

    // 序列化为JSON
    data, err := json.Marshal(person)
    if err != nil {
        panic(err)
    }

    // 写入文件，带格式缩进可使用 MarshalIndent
    err = os.WriteFile("person.json", data, 0644)
    if err != nil {
        panic(err)
    }
}

package main

import (
    "encoding/json"
    "os"
)

func main() {
    file, err := os.Create("data.json")
    if err != nil {
        panic(err)
    }
    defer file.Close()

    encoder := json.NewEncoder(file)
    // 可选：美化输出
    encoder.SetIndent("", "  ")

    data := map[string]interface{}{
        "name": "Bob",
        "age":  25,
    }

    err = encoder.Encode(data)
    if err != nil {
        panic(err)
    }
}

data, err := json.MarshalIndent(person, "", "  ")
if err != nil {
    panic(err)
}
err = os.WriteFile("pretty.json", data, 0644)
if err != nil {
    panic(err)
}

people := []Person{
    {Name: "Alice", Age: 30},
    {Name: "Bob", Age: 25},
}

data, _ := json.MarshalIndent(people, "", "  ")
os.WriteFile("people.json", data, 0644)