1.类型识别 var data interface{} = "hello"
strValue, ok := data.(string)
if ok {
fmt.Printf("%s is string type\n", strValue)
}
T的类型并不是任意的，比如有如下json
var f interface{}
b := []byte(`[{"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}]`)
json.Unmarshal(b, &f)
data, ok := f.([]interface{}) // 这里不能使用f.([]map[string]interface{})，这样是无法判断成功的
if ok {
fmt.Printf("%+v\n", data)
return
}2.类型获取 var str string = “hello”
fmt.Println(reflect.TypeOf(str))
3.类型判断 var f interface{}
b := []byte(`[{"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}]`)
json.Unmarshal(b, &f)
for k, v := range f.(map[string]interface{}) {
switch vv := v.(type) {
case string:
fmt.Println(k, "is string", vv)
case int:
fmt.Println(k, "is int ", vv)
case float64:
fmt.Println(k, "is float64 ", vv)
case []interface{}:
fmt.Println(k, "is array:")
for i, j := range vv {
fmt.Println(i, j)
}
}
}
var str string = “hello” fmt.Println(reflect.TypeOf(str))
3.类型判断 var f interface{}
b := []byte(`[{"Name":"Wednesday","Age":6,"Parents":["Gomez","Morticia"]}]`)
json.Unmarshal(b, &f)
for k, v := range f.(map[string]interface{}) {
switch vv := v.(type) {
case string:
fmt.Println(k, "is string", vv)
case int:
fmt.Println(k, "is int ", vv)
case float64:
fmt.Println(k, "is float64 ", vv)
case []interface{}:
fmt.Println(k, "is array:")
for i, j := range vv {
fmt.Println(i, j)
}
}
}
通过以上三种方法，基本上可以满足golang中对类型的动态识别、获取和判断操作了。
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