go語言之進階篇json解析到map

1、json解析到map（通過類型斷言，找到值和value類型）

示例：

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	jsonBuf := `
	{
    "company": "itcast",
    "subjects": [
        "Go",
        "C++",
        "Python",
        "Test"
    ],
    "isok": true,
    "price": 666.666
}`

	//創建一個map
	m := make(map[string]interface{}, 4)

	err := json.Unmarshal([]byte(jsonBuf), &m) //第二個參數要地址傳遞
	if err != nil {
		fmt.Println("err = ", err)
		return
	}
	fmt.Printf("m = %+v\n", m)

	var str string

	//類型斷言, 值，它是value類型
	for key, value := range m {
		//fmt.Printf("%v ============> %v\n", key, value)
		switch data := value.(type) {
		case string:
			str = data
			fmt.Printf("map[%s]的值類型為string, value = %s\n", key, str)
		case bool:
			fmt.Printf("map[%s]的值類型為bool, value = %v\n", key, data)
		case float64:
			fmt.Printf("map[%s]的值類型為float64, value = %f\n", key, data)
		case []string:
			fmt.Printf("map[%s]的值類型為[]string, value = %v\n", key, data)
		case []interface{}:
			fmt.Printf("map[%s]的值類型為[]interface, value = %v\n", key, data)
		}

	}

}

執行結果：

m = map[isok:true price:666.666 company:itcast subjects:[Go C++ Python Test]]

map[company]的值類型為string, value = itcast
map[subjects]的值類型為[]interface, value = [Go C++ Python Test]
map[isok]的值類型為bool, value = true
map[price]的值類型為float64, value = 666.666000