如何在 Go 中跳过文件的第一行？

Question

如何在 Go 中读取文件并跳过第一行/标题？

在Python中我知道我可以做

counter = 0
with open("my_file_path", "r") as fo:
    try:
        next(fo)
    except:
        pass
    for _ in fo:
         counter = counter + 1

这是我的 Go 应用程序

package main    
import (
    "bufio"
    "flag"
    "os"
)

func readFile(fileLocation string) int {
    fileOpen, _ := os.Open(fileLocation)
    defer fileOpen.Close()
    fileScanner := bufio.NewScanner(fileOpen)

    counter := 0
    for fileScanner.Scan() {
        //fmt.Println(fileScanner.Text())
        counter = counter + 1
    }

    return counter
}

func main() {
    fileLocation := flag.String("file_location", "default value", "file path to count lines")
    flag.Parse()

    counted := readFile(*fileLocation)
    println(counted)
}

我将读取一个巨大的文件，并且不想在索引为 0 时评估每一行。

Answer 1

如何在循环之前移动到下一个标记

scanner := bufio.NewScanner(file)
scanner.Scan() // this moves to the next token
for scanner.Scan() {
    fmt.Println(scanner.Text())
}

文件

1
2
3

输出

2
3

https://play.golang.org/p/I2w50zFdcg0

Answer 2

你可以尝试这样的事情

func readFile(fileLocation string) int {
            fileOpen, _ := os.Open(fileLocation)
            defer fileOpen.Close()
            fileScanner := bufio.NewScanner(fileOpen)
            counter := 0
            for fileScanner.Scan() {
                // read first line and ignore
                fileScanner.Text()
                break
            }

           for fileScanner.Scan() {
                // read remaining lines and process
                txt := fileScanner.Text()
                counter = counter + 1
               // do something with text
            }


            return counter
        }

编辑：

func readFile(fileLocation string) int {
            fileOpen, _ := os.Open(fileLocation)
            defer fileOpen.Close()
            fileScanner := bufio.NewScanner(fileOpen)
            counter := 0
            if fileScanner.Scan() {
                // read first line and ignore
                fileScanner.Text()
            }

           for fileScanner.Scan() {
                // read remaining lines and process
                txt := fileScanner.Text()
               // do something with text
               counter = counter + 1
            }


            return counter
        }