Go语言中常见的文件操作分享

package main

import (
    "fmt"
    "path"
)

func JoinPath() {
    dirs := []string{"/", "home", "ray", "workspace"}
    path := path.Join(dirs...)
    fmt.Printf("Path after join: %v\n", path)
}

func main() {
    JoinPath()
}

package main

import (
    "log"
    "os"
)

func CreateEmptyFile() {
	myFile, err := os.Create("sample.txt")
	if err != nil {
		log.Fatal("ERROR! ", err)
	}
	log.Println("Empty file created successfully. ", myFile)
	myFile.Close()
}

func main() {
    CreateEmptyFile()
}

package main

import (
    "fmt"
    "log"
    "os"
)

func FileInfo() {
	fileInfo, err := os.Stat("sample.txt")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("File Name:", fileInfo.Name())
	fmt.Println("Size ", fileInfo.Size(), " bytes")
	fmt.Println("Permissions:", fileInfo.Mode())
	fmt.Println("Last modified:", fileInfo.ModTime())
	fmt.Println("Is Directory: ", fileInfo.IsDir())
}

func main() {
    FileInfo()
}

package main

import (
    "log"
    "os"
)

func FileRead(filePath string) {
	oFile, err := os.Open(filePath)
	if err != nil {
		log.Fatal(err)
	}
	defer oFile.Close()
	buff := make([]byte, 100)
	for no, err := oFile.Read(buff); err == nil; no, err = oFile.Read(buff) {
		if no > 0 {
			os.Stdout.Write(buff[0:no])
		}
	}
}

func main() {
    FileRead("sample.txt")
}

package main

import (
    "log"
    "io"
    "os"
)

func Copy(src, dest string) {

	srcFile, err := os.Open(src)
	if err != nil {
		log.Fatal(err)
	}
	defer srcFile.Close()

	destFile, err := os.Create(dest)
	if err != nil {
		log.Fatal(err)
	}
	defer destFile.Close()

	numBytes, err := io.Copy(destFile, srcFile)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Successfully copied %d bytes", numBytes)
	err = destFile.Sync()
	if err != nil {
		log.Fatal(err)
	}
}

func main() {
    Copy("source.txt", "dest.txt")
}