string到int

int,err:=strconv.Atoi(string)

string到int64

int64, err := strconv.ParseInt(string, 10, 64)

int到string

string:=strconv.Itoa(int)

int64到string

string:=strconv.FormatInt(int64,10)

string 不能直接和byte数组转换
string可以和byte的切片转换
1,string 转为[]byte
var str string = "test"
var data []byte = []byte(str)

2,byte转为string
var data [10]byte
byte[0] = 'T'
byte[1] = 'E'
var str string = string(data[:])