例如，使用通用Go机制获取自定义JSON值的Ruby JSON数字类型，
package main
import (
"encoding/json"
"fmt"
"strconv"
)
func main() {
str := `{"a":123,"b":12.3,"c":"123","d":"12.3","e":true}`
var raw map[string]json.RawMessage
err := json.Unmarshal([]byte(str), &raw)
if err != nil {
panic(err)
}
parsed := make(map[string]interface{}, len(raw))
for key, val := range raw {
s := string(val)
i, err := strconv.ParseInt(s, 10, 64)
if err == nil {
parsed[key] = i
continue
}
f, err := strconv.ParseFloat(s, 64)
if err == nil {
parsed[key] = f
continue
}
var v interface{}
err = json.Unmarshal(val, &v)
if err == nil {
parsed[key] = v
continue
}
parsed[key] = val
}
for key, val := range parsed {
fmt.Printf("%T: %v %v\n", val, key, val)
}
}
游乐场：https ://play.golang.org/p/VmG8IZV4CG_Y
输出：
int64: a 123
float64: b 12.3
string: c 123
string: d 12.3
bool: e true
另一个示例，使用Go json.Number类型的Ruby JSON数字类型，
package main
import (
"encoding/json"
"fmt"
"strings"
)
func main() {
str := `{"a":123,"b":12.3,"c":"123","d":"12.3","e":true}`
var parsed map[string]interface{}
d := json.NewDecoder(strings.NewReader(str))
d.UseNumber()
err := d.Decode(&parsed)
if err != nil {
panic(err)
}
for key, val := range parsed {
n, ok := val.(json.Number)
if !ok {
continue
}
if i, err := n.Int64(); err == nil {
parsed[key] = i
continue
}
if f, err := n.Float64(); err == nil {
parsed[key] = f
continue
}
}
for key, val := range parsed {
fmt.Printf("%T: %v %v\n", val, key, val)
}
}
游乐场：https ://play.golang.org/p/Hk_Wb0EM-aY
输出：
int64: a 123
float64: b 12.3
string: c 123
string: d 12.3
bool: e true
@ShudiptaSharma建议的工作版本。
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