go语言之进阶篇json解析到map

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原作者: [db:作者] 来自: [db:来源] 收藏邀请

1、json解析到map（通过类型断言，找到值和value类型）

示例：

package main

import (
	"encoding/json"
	"fmt"
)

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

	//创建一个map
	m := make(map[string]interface{}, 4)

	err := json.Unmarshal([]byte(jsonBuf), &m) //第二个参数要地址传递
	if err != nil {
		fmt.Println("err = ", err)
		return
	}
	fmt.Printf("m = %+v\n", m)

	var str string

	//类型断言, 值，它是value类型
	for key, value := range m {
		//fmt.Printf("%v ============> %v\n", key, value)
		switch data := value.(type) {
		case string:
			str = data
			fmt.Printf("map[%s]的值类型为string, value = %s\n", key, str)
		case bool:
			fmt.Printf("map[%s]的值类型为bool, value = %v\n", key, data)
		case float64:
			fmt.Printf("map[%s]的值类型为float64, value = %f\n", key, data)
		case []string:
			fmt.Printf("map[%s]的值类型为[]string, value = %v\n", key, data)
		case []interface{}:
			fmt.Printf("map[%s]的值类型为[]interface, value = %v\n", key, data)
		}

	}

}

执行结果：

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

map[company]的值类型为string, value = itcast
map[subjects]的值类型为[]interface, value = [Go C++ Python Test]
map[isok]的值类型为bool, value = true
map[price]的值类型为float64, value = 666.666000