从Go1.1版本开始，有一个bufio.Scanner
API可以轻松读取文件中的行。考虑上面的以下示例，该示例使用Scanner重写：
package mainimport ( "bufio" "fmt" "log" "os")// readLines reads a whole file into memory// and returns a slice of its lines.func readLines(path string) ([]string, error) { file, err := os.Open(path) if err != nil { return nil, err } defer file.Close() var lines []string scanner := bufio.NewScanner(file) for scanner.Scan() { lines = append(lines, scanner.Text()) } return lines, scanner.Err()}// writeLines writes the lines to the given file.func writeLines(lines []string, path string) error { file, err := os.Create(path) if err != nil { return err } defer file.Close() w := bufio.NewWriter(file) for _, line := range lines { fmt.Fprintln(w, line) } return w.Flush()}func main() { lines, err := readLines("foo.in.txt") if err != nil { log.Fatalf("readLines: %s", err) } for i, line := range lines { fmt.Println(i, line) } if err := writeLines(lines, "foo.out.txt"); err != nil { log.Fatalf("writeLines: %s", err) }}
