How to read or write file from stream in Golang?

In Go, you can read from a stream or write a file using the io package: Reading a file from a stream: Create a buffered reader. Read the file line by line using the ReadString or ReadBytes method. Write a file to a stream: Use the WriteString or WriteBytes function to write to a file.

How to read or write a file from a stream in Golang?

In Golang, you can use the io package to read from a stream or write to a file. This package provides a set of functions and interfaces for manipulating input/output streams.

Reading a file from a stream

To read a file from a stream, you can create a buffered reader using the bufio.NewReader function and then use ## Read the file using methods such as #ReadString or ReadBytes.

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    // 打开文件
    file, err := os.Open("file.txt")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer file.Close()

    // 创建缓冲读取器
    reader := bufio.NewReader(file)

    // 逐行读取文件
    for {
        line, err := reader.ReadString('\n')
        if err == io.EOF {
            break
        }
        if err != nil {
            fmt.Println(err)
            return
        }

        // 处理每行
    }
}

Write a file to a stream

To write a file to a stream, you can use the

io.WriteString or io.WriteBytes function .

package main

import (
    "fmt"
    "os"
)

func main() {
    // 打开文件
    file, err := os.Create("file.txt")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer file.Close()

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

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