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 theiopackage 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 thebufio.NewReaderfunction and then use ## Read the file using methods such as #ReadStringorReadBytes.

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 } }

io.WriteStringorio.WriteBytesfunction .

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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