总结

io.WriteString > File.WriteString > ioutil.WriteFile > Write.WriteString
4.99M txt文档性能测试如下：
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io.WriteString

func WriteString(w Writer, s string) (n int, err error)

  1. package main
  3. import (
  4.     "fmt"
  5.     "io"
  6.     "os"
  7. )
  9. func main() {
  10.     f, err := os.OpenFile(
  11.         "C:/Users/Administrator/Downloads/test.txt",
  12.         os.O_RDWR|os.O_CREATE,
  13.         0777)
  14.     if err != nil {
  15.         fmt.Println(err)
  16.         return
  17.     }
  18.     defer f.Close()
  20.     _, err = io.WriteString(f, "测试文本")
  21.     if err != nil {
  22.         fmt.Println(err)
  23.         return
  24.     }
  26.     fmt.Println("write successful")
  27. }


*File.WriteString

func (f *File) WriteString(s string) (n int, err error)

  1. package main
  3. import (
  4.     "fmt"
  5.     "os"
  6. )
  8. func main() {
  9.     f, err := os.OpenFile(
  10.         "C:/Users/Administrator/Downloads/test.txt",
  11.         os.O_RDWR|os.O_CREATE,
  12.         0777)
  13.     if err != nil {
  14.         fmt.Println(err)
  15.         return
  16.     }
  17.     defer f.Close()
  19.     f.WriteString("测试文本")
  20.     fmt.Println("write successful")
  21. }

ioutil.WriteFile

unc WriteFile(filename string, data []byte, perm os.FileMode) error

  1. package main
  3. import (
  4.     "fmt"
  5.     "io/ioutil"
  6.     "os"
  7. )
  9. func main() {
  10.     err := ioutil.WriteFile(
  11.         "C:/Users/Administrator/Downloads/test.txt",
  12.         []byte("测试文本"),
  13.         0777)
  14.     if err != nil {
  15.         fmt.Println(err)
  16.     }
  18.     fmt.Println("write successful")
  19. }


*Write.WriteString

func (b *Writer) WriteString(s string) (int, error)

  1. package main
  3. import (
  4.     "bufio"
  5.     "fmt"
  6.     "os"
  7. )
  9. func main() {
  10.     f, err := os.OpenFile(
  11.         "C:/Users/Administrator/Downloads/test.txt",
  12.         os.O_RDWR|os.O_CREATE,
  13.         0777)
  14.     if err != nil {
  15.         fmt.Println(err)
  16.         return
  17.     }
  18.     defer f.Close()
  20.     writer := bufio.NewWriter(f)
  21.     _, err = writer.WriteString("测试文本")
  22.     if err != nil {
  23.         fmt.Println(err)
  24.         return
  25.     }
  26.     writer.Flush()
  28.     fmt.Println("write successful")
  29. }