将文本文件读入字符串数组（并写入） [英] Read text file into string array (and write)

问题描述

读取（和写入）文本文件进出字符串数组的能力是我相信的一个相当普遍的要求。从最初访问数据库的语言开始，它也非常有用。在Golang中是否存在？

例如 func ReadLines（sFileName string，iMinLines int）（[] string，bool）{

和 func WriteLines（saBuff []字符串，sFilename字符串）（bool）{。

我倾向于使用现有的而不是重复。

The ability to read (and write) a text file into and out of a string array is I believe a fairly common requirement. It is also quite useful when starting with a language removing the need initially to access a database. Does one exist in Golang?
e.g. func ReadLines(sFileName string, iMinLines int) ([]string, bool) {
and func WriteLines(saBuff[]string, sFilename string) (bool) {.
I would prefer to use an existing one rather than duplicate.

推荐答案

从Go1.1发布开始，有一个 bufio.Scanner API可以很容易地读取文件中的行。请看下面的例子，用Scanner重写：

As of Go1.1 release, there is a bufio.Scanner API that can easily read lines from a file. Consider the following example from above, rewritten with Scanner:

package main

import (
  "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)
  }
}

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