go语言之进阶篇json解析到map

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