持续更新
类型转换
int转string
s := strconv.Itoa(i)
// 等价于
s := strconv.FormatInt(int64(i), 10)
int64转string
i := int64(123)
s := strconv.FormatInt(i, 10)
// 第二个参数为基数，可选2~36
// 注：对于无符号整形，可以使用FormatUint(i uint64, base int)
string转int
i, err := strconv.Atoi(s)
string转int64
i, err := strconv.ParseInt(s, 10, 64)
// 第二个参数为基数（2~36），第三个参数位大小表示期望转换的结果类型，其值可以为0, 8, 16, 32和64，分别对应 int, int8, int16, int32和int64
float转string
v := 3.1415926535
s1 := strconv.FormatFloat(v, 'E', -1, 32) //float32
s2 := strconv.FormatFloat(v, 'E', -1, 64) //float64
string转float
s := "3.1415926535"
v1, err := strconv.ParseFloat(v, 32)
v2, err := strconv.ParseFloat(v, 64)
map/struct/json转换
Struct转Map
func Struct2Map(src interface{}) map[string]interface{} {
if reflect.TypeOf(src).Kind() == reflect.Struct {
str := structs.New(src)
str.TagName = "json"
return str.Map()
}
switch s := src.(type) {
case map[string]interface{}:
return s
}
b, err := json.Marshal(src)
if err != nil {
log.Error("Struct2Map:%v Error:%v", src, err.Error())
return make(map[string]interface{})
}
return Byte2Map(&b)
}
Struct转json
func Struct2String(src interface{}) string {
b, err := json.Marshal(src)
if err != nil {
log.Error("Struct2String:%v Error:%v", src, err.Error())
return ""
}
return string(b)
}
Map转json
func Map2Json(){
m := map[string]interface{}{"name": "zhangsan", "age": 10}
jsonStr, err := json.Marshal(m)
if err != nil {
fmt.Println(err.Error())
}
fmt.Println(string(jsonStr))
}
Map转struct
type People struct {
Name string `json:"name"`
Age string `json:"age"`
}
func MapToStructDemo(){
m := map[string]interface{}{"name": "zhangsan", "age": 10}
var people People
err := mapstructure.Decode(m, &people)
if err != nil {
fmt.Println(err)
}
fmt.Println(people)
}
json转map
func JsonToMapDemo(){
jsonStr := `{"name": "zhangsan", "age": 10}`
var m map[string]interface{}
err := json.Unmarshal([]byte(jsonStr), &m)
if err != nil {
fmt.Println("JsonToMapDemo err: ", err)
}
fmt.Println(m)
}
json转struct
type People struct {
Name string `json:"name"`
Age string `json:"age"`
}
func JsonToMapDemo(){
jsonStr := `{"name": "zhangsan", "age": 10}`
var people People
json.Unmarshal([]byte(jsonStr), &people)
fmt.Println(people)
}