我正在尝试这段代码:
// GetFooter returns a string which is the Footer of an edi file
func GetFooter(file *os.File) (out string, err error) {
// TODO can scanner read files backwards? Seek can get us to the end of file
var lines []string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
line1 := lines[len(lines)-2]
line2 := lines[len(lines)-1]
return line1 + "\n" + line2, scanner.Err()
}
我想知道是否有更便宜的方法来获取文件的最后两行?
最佳答案
扫描缓冲区时,您只能将最后两行保留在内存中。
package main
import (
"fmt"
"bufio"
"bytes"
"strconv"
)
func main() {
var buffer bytes.Buffer
for i := 0; i < 1000; i++ {
s := strconv.Itoa(i)
buffer.WriteString(s + "\n")
}
fmt.Println(GetFooter(&buffer))
}
func GetFooter(file *bytes.Buffer) (out string, err error) {
var line1, line2 string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line1, line2 = line2, scanner.Text()
}
return line1 + "\n" + line2, scanner.Err()
}
关于go - 如何使文件阅读器的功能更有效?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60343413/