Golang文件I/O缓冲读取与写入方法

os.File

Read

Write

bufio

bufio.Scanner

bufio.Reader

bufio.Scanner

file, err := os.Open("example.txt")<br>if err != nil {<br>    log.Fatal(err)<br>}<br>defer file.Close()<br><br>scanner := bufio.NewScanner(file)<br>for scanner.Scan() {<br>    line := scanner.Text()<br>    fmt.Println(line)<br>}<br><br>if err := scanner.Err(); err != nil {<br>    log.Fatal(err)<br>}

bufio.Reader

reader := bufio.NewReader(file)<br>buf := make([]byte, 4096)<br>for {<br>    n, err := reader.Read(buf)<br>    if n > 0 {<br>        // 处理 buf[0:n]<br>        fmt.Printf("读取 %d 字节\n", n)<br>    }<br>    if err == io.EOF {<br>        break<br>    }<br>    if err != nil {<br>        log.Fatal(err)<br>    }<br>}

Write

bufio.Writer

file, err := os.Create("output.txt")<br>if err != nil {<br>    log.Fatal(err)<br>}<br>defer file.Close()<br><br>writer := bufio.NewWriter(file)<br><br>data := []string{"行1", "行2", "行3"}<br>for _, line := range data {<br>    _, err := writer.WriteString(line + "\n")<br>    if err != nil {<br>        log.Fatal(err)<br>    }<br>}<br><br>// 必须调用 Flush，确保数据写入磁盘<br>err = writer.Flush()<br>if err != nil {<br>    log.Fatal(err)<br>}

writer := bufio.NewWriterSize(file, 32*1024) // 32KB 缓冲区

bufio