Golang strconv和strings 常用方法

Love The Way You Lie 2023-02-18 16:23 272阅读 0赞

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:%q\n",strings.Trim("!  abc china  ","!"))		//str1:"  abc china  "
    	fmt.Printf("str2:%q\n",strings.Trim("!  abc china  "," !"))		//str2:"abc china"
    
    	//16 去掉字符串左边或者右边
    	fmt.Printf("str1:%q\n",strings.TrimLeft("!  abc china  !","!"))			//str1:"  abc china  !"
    	fmt.Printf("str1:%q\n",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
    
    }