Golang determines whether the file exists or not and creates the file.

1. Determine whether a file or folder exists

golang can determine whether a file or folder exists through the os.stat() method and os.IsExist() method to judge:

func isExist(path string)(bool){
    _, err := os.Stat(path)
    if err != nil{
        if os.IsExist(err){
            return true
        }
        if os.IsNotExist(err){
            return false
        }
        fmt.Println(err)
        return false
    }
    return true
}

2. Recursively create folders

Recursive folders use os.MkdirAll() method:

func MkdirAll(path string, perm FileMode) error

The first parameter is the path, and the second is the permission. If the folder does not exist, create it; if it exists, do nothing.

3. Test code

package main
import (
    "os"
    "fmt"
)
//判断文件或文件夹是否存在
func isExist(path string)(bool){
    _, err := os.Stat(path)
    if err != nil{
        if os.IsExist(err){
            return true
        }
        if os.IsNotExist(err){
            return false
        }
        fmt.Println(err)
        return false
    }
    return true
}
func main(){
    //递归创建文件夹
    err := os.MkdirAll("./test/1/2", os.ModePerm)
    if err != nil{
        fmt.Println(err)
        return
    }
    dirs := []string{"./test/1", "./test/2", "./test/1.txt"}
    for _, v := range dirs{
        if isExist(v){
            fmt.Printf("%s is exist!", v)
        }else{
            fmt.Printf("%s is not exist!", v)
        }
    }
}

Execute in the terminal:

ma@ma:/data/code/go/src/file_exist$ tree
.
└── file_exist.go
0 directories, 1 file
ma@ma:/data/code/go/src/file_exist$ go run file_exist.go  # 运行程序
./test/1 is exist!
./test/2 is not exist!
./test/1.txt is not exist!
ma@ma:/data/code/go/src/file_exist$ tree  
.
├── file_exist.go
└── test
    └── 1
        └── 2
3 directories, 1 file
ma@ma:/data/code/go/src/file_exist$ touch test/1.txt  # 创建1.txt
ma@ma:/data/code/go/src/file_exist$ go run file_exist.go 
./test/1 is exist!
./test/2 is not exist!
./test/1.txt is exist!  # 1.txt存在

For more golang knowledge, please pay attention to the golang tutorial column .

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