How to write content to file using Golang?

How to write content to a file in Go? Use os.OpenFile() to open or create a file and return an *os.File object for writing. Use the io.WriteString() function to write a string directly to the io.Writer interface. Use bufio.Writer to provide buffered write operations and improve performance.

How to write content to a file in Go

The Go language provides a variety of methods to write content to a file. This article will introduce several of the most common methods and demonstrate them with practical examples.

Using os.OpenFile()

The os.OpenFile() function allows you to open or create a file in a specified file mode. It returns an *os.File object that can be used to write to a file.

package main

import (
    "fmt"
    "os"
)

func main() {
    // 以可写模式打开或创建文件
    f, err := os.OpenFile("test.txt", os.O_WRONLY|os.O_CREATE, 0644)
    if err != nil {
        fmt.Println(err)
        return
    }

    // 将内容写入文件
    _, err = f.WriteString("Hello, world!")
    if err != nil {
        fmt.Println(err)
        return
    }

    // 关闭文件
    if err := f.Close(); err != nil {
        fmt.Println(err)
    }
}

Use io.WriteString()

io.WriteString() function is a simpler way to write to a file. It writes strings directly to the io.Writer interface.

package main

import (
    "fmt"
    "io"
    "os"
)

func main() {
    // 以可写模式打开文件
    f, err := os.OpenFile("test.txt", os.O_WRONLY|os.O_CREATE, 0644)
    if err != nil {
        fmt.Println(err)
        return
    }

    // 将内容写入文件
    if _, err = io.WriteString(f, "Hello, world!\n"); err != nil {
        fmt.Println(err)
        return
    }

    // 关闭文件
    if err := f.Close(); err != nil {
        fmt.Println(err)
    }
}

Use bufio.Writer

##bufio.Writer provides buffered write operations, which can improve performance.

package main

import (
    "fmt"
    "io"
    "os"

    "bufio"
)

func main() {
    // 以可写模式打开文件
    f, err := os.OpenFile("test.txt", os.O_WRONLY|os.O_CREATE, 0644)
    if err != nil {
        fmt.Println(err)
        return
    }

    // 使用 bufio.Writer 进行缓冲写入
    w := bufio.NewWriter(f)
    if _, err = w.WriteString("Hello, world!\n"); err != nil {
        fmt.Println(err)
        return
    }

    // 务必刷新缓冲区以将数据写入文件
    if err := w.Flush(); err != nil {
        fmt.Println(err)
        return
    }

    // 关闭文件
    if err := f.Close(); err != nil {
        fmt.Println(err)
    }
}

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