[GO]json解析到map

package main

import (
    "encoding/json"
    "fmt"
)

var str string

func main() {
    m := make(map[string]interface{}, 4)
    jsonbuf := `{"company":"zyg","isok":true,"price":5.55,"subjects":["go","python","java"]}`
    err := json.Unmarshal([]byte(jsonbuf), &m)
    if err != nil {
        return
    }
    for key, value := range m{
        switch data := value.(type) {
        case string:
            str = data
            fmt.Printf("m[%s] value type is string, = %s\n", key, str)
        case float64:
            fmt.Printf("m[%s] value type is float64, = %f\n", key, data)
        case bool:
            fmt.Printf("m[%s] value type is bool, = %v\n", key, data)
        case []interface{}:
            fmt.Printf("m[%s] value type is []interface{}, = %v\n", key, data)
        }
    }
}

執行的結果為

m[isok] value type is bool, = true
m[price] value type is float64, = 5.550000
m[subjects] value type is []interface{}, = [go python java]
m[company] value type is string, = zyg

這里可以看到，將json解析到map與解析到結構各有各的好處，在聲明上，結構體需要聲明結構類型，而map只需要一個make函數，但是一旦得到了值以后，結構休的方式可以直接操作，map方式需要一個一個進行斷言判斷才行