How to copy or move files using Golang?

In Golang, you can use the os package to copy or move files: Copy files: Use io.Copy to copy the contents of the source file to the target file. Moving files: Use os.Rename to rename a source file to a target file, essentially moving the file.

How to copy or move files using Golang?

In Golang, files can be copied or moved by using the os package. Here is a code example of how to do it:

1. Copy file

package main

import (
    "io"
    "os"
)

func main() {
    srcFile, err := os.Open("source.txt")
    if err != nil {
        panic(err)
    }
    defer srcFile.Close()

    dstFile, err := os.Create("destination.txt")
    if err != nil {
        panic(err)
    }
    defer dstFile.Close()

    _, err = io.Copy(dstFile, srcFile)
    if err != nil {
        panic(err)
    }
}

2. Move file

package main

import (
    "os"
)

func main() {
    err := os.Rename("source.txt", "destination.txt")
    if err != nil {
        panic(err)
    }
}

Practical Case

In actual use, you can use the following code example to copy or move files:

package main

import (
    "context"
    "fmt"
    "io"
    "io/ioutil"
    "os"
)

func copyFile(src, dst string) error {
    srcFile, err := os.Open(src)
    if err != nil {
        return err
    }
    defer srcFile.Close()

    dstFile, err := os.Create(dst)
    if err != nil {
        return err
    }
    defer dstFile.Close()

    if _, err := io.Copy(dstFile, srcFile); err != nil {
        return err
    }

    return nil
}

func moveFile(src, dst string) error {
    if err := copyFile(src, dst); err != nil {
        return err
    }
    return os.Remove(src)
}

func main() {
    srcData := "Hello World!"
    err := ioutil.WriteFile("source.txt", []byte(srcData), 0644)
    if err != nil {
        panic(err)
    }

    // 复制文件
    if err := copyFile("source.txt", "destination1.txt"); err != nil {
        panic(err)
    }

    // 移动文件
    if err := moveFile("destination1.txt", "destination2.txt"); err != nil {
        panic(err)
    }

    // 检查是否成功
    dstData, err := ioutil.ReadFile("destination2.txt")
    if err != nil {
        panic(err)
    }
    fmt.Println(string(dstData)) // 输出："Hello World!"
}

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