Golang String字符串类型转Json格式

package main

import (
	"encoding/json"
	"fmt"
)

type Data struct {
	Status  int    `json:"status"`
	Msg   int    `json:"msg"`
}


func main() {
	msg := "{\"status\":200, \"msg\":18}"
	var data Data
	if err := json.Unmarshal([]byte(msg), &data); err == nil {
		fmt.Println(data.Status)
	} else {
		fmt.Println(err)
	}
}

map [string] interface {} 存储 JOSN 对象
[] interface 存储 JOSN 数组

jsonData := []byte(`{"Name":"Eve","Age":6,"Parents":["Alice","Bob"]}`)

var v interface{}
json.Unmarshal(jsonData, &v)
data := v.(map[string]interface{})

for k, v := range data {
    switch v := v.(type) {
    case string:
        fmt.Println(k, v, "(string)")
    case float64:
        fmt.Println(k, v, "(float64)")
    case []interface{}:
        fmt.Println(k, "(array):")
        for i, u := range v {
            fmt.Println("    ", i, u)
        }
    default:
        fmt.Println(k, v, "(unknown)")
    }
}

// This example uses a Decoder to decode a stream of distinct JSON values.
func ExampleDecoder() {
    const jsonStream = `
    {"Name": "Ed", "Text": "Knock knock."}
    {"Name": "Sam", "Text": "Who's there?"}
    {"Name": "Ed", "Text": "Go fmt."}
    {"Name": "Sam", "Text": "Go fmt who?"}
    {"Name": "Ed", "Text": "Go fmt yourself!"}
`
    type Message struct {
        Name, Text string
    }
    dec := json.NewDecoder(strings.NewReader(jsonStream))
    for {
        var m Message
        if err := dec.Decode(&m); err == io.EOF {
            break
        } else if err != nil {
            log.Fatal(err)
        }
        fmt.Printf("%s: %s\n", m.Name, m.Text)
    }
    // Output:
    // Ed: Knock knock.
    // Sam: Who's there?
    // Ed: Go fmt.
    // Sam: Go fmt who?
    // Ed: Go fmt yourself!
}