golang常用函数

妇愁者纞萌 / 2023-08-24 / 原文

1.文件读写

package main
import (
	"fmt"
	"os"
)
func main(){
	yaml_str,err:=os.ReadFile("poc/1.yml")
	if err!=nil{
		panic(err)
	}
	poc_old:=string(yaml_str)

    os.WriteFile("poc/1.yml",[]byte("s_yaml_str1gdfgfdgdfg111"),os.ModePerm)

	fmt.Println(poc_old)

}

2.字符串处理

package main
import (
   "fmt"
   "strings"
)
func main(){
   str1:="hello word"
   fmt.Println(len(str1))
   str2:=[]rune(str1)
   for i:=0;i<len(str2);i++{
      fmt.Printf("%c\n",str2[i])
   }
   str3:=strings.Contains(str1,"word")//是否包含关键词
   fmt.Println(str3)
   str4:=strings.Index(str1,"word")//索引位置
   fmt.Println(str4)
   str5 := strings.Trim("!hello !"," !")//去掉特殊字符
   fmt.Println(str5)
   str6 := strings.ToLower("Go")//转小写
   str7 := strings.ToUpper("Go")//转大写
   fmt.Println(str6,str7)
   str8 := strings.TrimSpace(" tn hello ")//去掉空格
   fmt.Println(str6,str8)
   str9:=strings.Split("hello,wrold,ok",",")//分隔成数组
   for j:=0;j<len(str9);j++{
      fmt.Println(str9[j])
   }
}

日期

package main
import (
	"fmt"
	"time"
)
func main() {
	now := time.Now()
	fmt.Printf("now=%v not type=%T\n", now, now)
	dateStr := fmt.Sprintf("当前年月日： %d-%02d-%d %d:%d:%d", now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), now.Second())
	fmt.Println(dateStr)
	start := time.Now().Unix()
	time.Sleep(5*time.Second)
	end := time.Now().Unix()
	fmt.Printf("test 用时%v秒",end - start)
	fmt.Printf(now.Format("2006-01-02 15:04:05"))
	fmt.Println()
	fmt.Printf(now.Format("2006-01-02"))
	fmt.Println()
	fmt.Printf(now.Format("15:04:05"))
	fmt.Println()
}