Golang strconv和strings 常用方法

package main
import (
"fmt"
"strings"
"strconv"
)
func main() {
//1）.长度
var str01 string = "hello"
fmt.Println("str01长度: ",len(str01))
//5
fmt.Println("str01长度: ",len("world 哈哈"))	//12
汉字3个字节
//2）.字符串遍历
var str02 = "hello 中国"
//有乱码--》h
e
l
l
o
ä
¸
­
å
½
for i := 0; i<len(str02); i++ {
fmt.Printf("%c
",str02[i])
}
fmt.Println()
//无乱码方式一--》h
e
l
l
o
中
国
str03 := []rune(str02)
for i := 0; i<len(str03); i++ {
fmt.Printf("%c
",str03[i])
}
fmt.Println()
//无乱码方式二--》0-h 1-e 2-l 3-l 4-o 5-
6-中 9-国
for index,val := range(str02) {
fmt.Printf("%d-%c ",index,val)
}
fmt.Println()
//3）字符串转整形数字
//方式一：strconv.Atoi
n,err := strconv.Atoi("123")
if err != nil {
fmt.Println("字符串转整形-转换错误")
} else {
fmt.Printf("%T,%d",n,n)
}
fmt.Println()
//方式二：strconv.ParseInt("123",10,64)
num,err := strconv.ParseInt("123",10,64)
if err != nil {
fmt.Println("字符串转整形-转换错误")
} else {
fmt.Printf("%T,%d",num,num)
}
fmt.Println()
//4）整形转字符串
//方式一
st := strconv.Itoa(12345)
fmt.Printf("%T,%s",st,st)
fmt.Println()
//方式二
st1 := strconv.FormatInt(int64(12345),10)
fmt.Printf("%T,%s",st1,st1)
fmt.Println()
//5) 字符串转 []byte
var bytes = []byte("abc")
fmt.Printf("bytes: %v",bytes)
fmt.Println()
//6) []byte转字符串
sst := string([]byte{97,98,99})
fmt.Printf("string: %s",sst)
fmt.Println()
//7)字符串的包含
var b1 = strings.Contains("123hello","hell")	//true
var b2 = strings.Contains("123hello","hel2")	//false
fmt.Println(b1)
fmt.Println(b2)
//8)统计字符的个数
strNum := strings.Count("chinese","e")
fmt.Println(strNum)
//9) == 区分大小写
EqualFold不区分大小写
fmt.Println("abc" == "ABC")
//false
fmt.Println("abc" == "abc")
//true
fmt.Println(strings.EqualFold("abc","ABc"))
//true
//10）返回下标位置 如果没有返回 -1
fmt.Println(strings.Index("china","in"))
//2
//11）最后出现的位置 如果没有返回 -1
fmt.Println(strings.LastIndex("china inc es","in"))
//6
//12) 替换字符串 得到一个新的字符串，原本的没有变 -1代表全部替换
fmt.Println(strings.Replace("come on come","come","qq",1))
//qq on come
fmt.Println(strings.Replace("come on come","come","qq",2))
//qq on qq
fmt.Println(strings.Replace("come on come","come","qq",-1))
//qq on qq
//12) 分割字符串成字符串数组
strArr := strings.Split("china,qq,kik",",")
fmt.Println(strArr)
//遍历
for index,val := range(strArr) {
fmt.Println(index," ",val)
}
//13) 字符串大小写转换
fmt.Println(strings.ToLower("abc HeLlo"))
fmt.Println(strings.ToUpper("ABc haha"))
//14) 字符串去左右空格
fmt.Println(strings.TrimSpace("
abc HeLlo
"))
//15) 字符串去掉指定字符
fmt.Printf("str1:%qn",strings.Trim("!
abc china
","!"))
//str1:"
abc china
"
fmt.Printf("str2:%qn",strings.Trim("!
abc china
"," !"))
//str2:"abc china"
//16 去掉字符串左边或者右边
fmt.Printf("str1:%qn",strings.TrimLeft("!
abc china
!","!"))
//str1:"
abc china
!"
fmt.Printf("str1:%qn",strings.TrimRight("!
abc china
!"," !"))
//str1:"!
abc china"
//17) 判断字符串前缀和后缀
fmt.Printf("%t",strings.HasPrefix("http://192.168.179.10","http"))
//true
fmt.Println()
fmt.Printf("%t",strings.HasSuffix("ttyh.jpg",".jpg"))
//true
}

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