Golang 字符串与其他类型互转

简介

开发过程中，经常遇到字符串与其他类型相互转换。Unknwon 含有许多转换规则，抽取一部分代码学习。

字符串转换代码

/*
字符串与其他类型互转
来源：https://github.com/Unknwon/com
*/
import (
	"fmt"
	"strconv"
)

// Convert string to specify type.
type StrTo string

func (f StrTo) Exist() bool {
	return string(f) != string(rune(0x1E))
}

func (f StrTo) Uint8() (uint8, error) {
	v, err := strconv.ParseUint(f.String(), 10, 8)
	return uint8(v), err
}

func (f StrTo) Int() (int, error) {
	v, err := strconv.ParseInt(f.String(), 10, 0)
	return int(v), err
}

func (f StrTo) Int64() (int64, error) {
	v, err := strconv.ParseInt(f.String(), 10, 64)
	return int64(v), err
}

func (f StrTo) Float64() (float64, error) {
	v, err := strconv.ParseFloat(f.String(), 64)
	return float64(v), err
}

func (f StrTo) MustUint8() uint8 {
	v, _ := f.Uint8()
	return v
}

func (f StrTo) MustInt() int {
	v, _ := f.Int()
	return v
}

func (f StrTo) MustInt64() int64 {
	v, _ := f.Int64()
	return v
}

func (f StrTo) MustFloat64() float64 {
	v, _ := f.Float64()
	return v
}

func (f StrTo) String() string {
	if f.Exist() {
		return string(f)
	}
	return ""
}

// Convert any type to string.
func ToStr(value interface{}, args ...int) (s string) {
	switch v := value.(type) {
	case bool:
		s = strconv.FormatBool(v)
	case float32:
		s = strconv.FormatFloat(float64(v), 'f', argInt(args).Get(0, -1), argInt(args).Get(1, 32))
	case float64:
		s = strconv.FormatFloat(v, 'f', argInt(args).Get(0, -1), argInt(args).Get(1, 64))
	case int:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int8:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int16:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int32:
		s = strconv.FormatInt(int64(v), argInt(args).Get(0, 10))
	case int64:
		s = strconv.FormatInt(v, argInt(args).Get(0, 10))
	case uint:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint8:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint16:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint32:
		s = strconv.FormatUint(uint64(v), argInt(args).Get(0, 10))
	case uint64:
		s = strconv.FormatUint(v, argInt(args).Get(0, 10))
	case string:
		s = v
	case []byte:
		s = string(v)
	default:
		s = fmt.Sprintf("%v", v)
	}
	return s
}

type argInt []int

func (a argInt) Get(i int, args ...int) (r int) {
	if i >= 0 && i < len(a) {
		r = a[i]
	} else if len(args) > 0 {
		r = args[0]
	}
	return
}

使用示例

1. string转int64

string_:= "12345"
read :=StrTo(string_).MustInt64()

2. string转float64

string_:= "12345.1246"
read :=StrTo(v).MustFloat64()

3. int转string

read := ToStr(123)