The file processing in the go language is generally in the os package
func Mkdir(name string, perm FileMode) error
Create a directory named name, and the permission setting is perm, such as 0777
func MkdirAll(path string, perm FileMode) error
Create multi-level subdirectories based on path, such as astaxie/test1/test2.
func Remove(name string) error
Delete the directory named name, an error occurs when there are files or other directories in the directory
func RemoveAll(path string) error
Delete multi-level subdirectories according to path. If path is a single name, then all subdirectories under the directory are deleted.
package main
import (
"fmt"
"os"
)
func main() {
os.Mkdir("ff", 0777)
os.MkdirAll("ff/test1/test2", 0777)
err := os.Remove("ff")
if err != nil {
fmt.Println(err)
}
os.RemoveAll("ff")
}
func Create(name string) (file *File, err Error)
Create a new file according to the provided file name, return a file object, the default permission is 0666 file, the returned file object is readable and writable.
func NewFile(fd uintptr, name string) *File
Create the corresponding file according to the file descriptor and return a file object
func Open(name string) (file *File, err Error)
This method opens a file named name, but it is read-only. The internal implementation actually calls OpenFile.
func OpenFile(name string, flag int, perm uint32) (file *File, err Error)
Open the file named name, flag is the way to open, read-only, read-write, etc., perm is the permission
func (file *File) Write(b []byte) (n int, err Error)
Write byte type information to the file
func (file *File) WriteAt(b []byte, off int64) (n int, err Error)
Start writing byte type information at the specified position
func (file *File) WriteString(s string) (ret int, err Error)
write string information to file
package main
import (
"fmt"
"os"
)
func main() {
userFile := "ff.txt"
fout, err := os.Create(userFile)
if err != nil {
fmt.Println(userFile, err)
return
}
defer fout.Close()
for i := 0; i < 10; i++ {
fout.WriteString("Just a test!\r\n")
fout.Write([]byte("Just a test!\r\n"))
}
}
func (file *File) Read(b []byte) (n int, err Error)
read data into b
func (file *File) ReadAt(b []byte, off int64) (n int, err Error)
Read data from off to b
package main
import (
"fmt"
"os"
)
func main() {
userFile := "ff.txt"
fl, err := os.Open(userFile)
if err != nil {
fmt.Println(userFile, err)
return
}
defer fl.Close()
buf := make([]byte, 1024)
for {
n, _ := fl.Read(buf)
if 0 == n {
break
}
os.Stdout.Write(buf[:n])
}
}
func Remove(name string) Error
Call this function to delete the file named name