How to write multiple lines into a text file using golang

huangapple
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英文:

How to write multiple lines into a text file using golang

问题

我正在尝试将错误写入文本文件。然而，我似乎无法弄清楚为什么它不会打印多个错误。它只会打印最新的错误。

  1.         for {
  2.             if resp.StatusCode == 200 {
  3.                 ...   
  4. 			    break
  5.             } else {
  6.                 data := fmt.Sprintf("[" + time.Now().Format("15:04:05") + "] " + strconv.Itoa(resp.StatusCode) + string(body) + "\n")
  7. 				file, err := os.Open("assets/errors.txt")
  8. 				if err != nil {
  9. 					fmt.Println(err)
  10. 				}
  12. 				write := bufio.NewWriter(file)
  13. 				write.WriteString(data)
  14. 				write.Flush()
  15.             }
英文:

I'm trying to write errors into a text file. However, I can't seem to figure out why it's not printing multiple errors. It just prints the latest one.

  1.         for {
  2.             if resp.StatusCode == 200 {
  3.                 ...   
  4. 			    break
  5.             } else {
  6.                 data := fmt.Sprintf("[" + time.Now().Format("15:04:05") +"] " + strconv.Itoa(resp.StatusCode) + string(body) + "\n")
  7. 				file, err := os.Open("assets/errors.txt")
  8. 				if err != nil {
  9. 					fmt.Println(err)
  10. 				}
  12. 				write := bufio.NewWriter(file)
  13. 				write.WriteString(data)
  14. 				write.Flush()
  15.             }

答案1

得分: 1

我建议你创建一个函数来实现这个功能，就像这样简单的代码：

  1. func LogErrors(errors []error, filePath string) error {
  2. 	f, err := os.OpenFile(filePath, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
  4. 	if err != nil {
  5. 		return err
  6. 	}
  8. 	writer := bufio.NewWriter(f)
  10. 	for _, e := range errors {
  11. 		writer.WriteString(e.Error())
  12. 		writer.WriteString("\n")
  13. 	}
  15. 	writer.Flush()
  16. 	return nil
  17. }

你可以像这样使用它：

  1. func main() {
  2. 	t := time.Now()
  3. 	filePath := fmt.Sprintf("/tmp/log-%s", t.Format("2006-01-02_15_04_05"))
  5. 	es := []error{
  6. 		errors.New("something is bad"),
  7. 		errors.New("another error fix it"),
  8. 	}
  9. 	LogErrors(es, filePath)
  10. }
英文:

I would like suggest you creating a function for that, as simple like:

  2. func LogErrors(errors []error, filePath string) error {
  3. 	f, err := os.OpenFile(filePath, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
  5. 	if err != nil {
  6. 		return err
  7. 	}
  9. 	writer := bufio.NewWriter(f)
  11. 	for _, e := range errors {
  12. 		writer.WriteString(e.Error())
  13. 		writer.WriteString("\n")
  14. 	}
  16. 	writer.Flush()
  17. 	return nil
  18. }

And you can use it like:

  2. func main() {
  3. 	t := time.Now()
  4. 	filePath := fmt.Sprintf("/tmp/log-%s", t.Format("2006-01-02_15_04_05"))
  6. 	es := []error{
  7. 		errors.New("something is bad"),
  8. 		errors.New("another error fix it"),
  9. 	}
  10. 	LogErrors(es, filePath)
  11. }

huangapple
  • 本文由 发表于 2021年12月30日 04:57:54
  • 转载请务必保留本文链接：https://go.coder-hub.com/70524937.html
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