一、按行读取

package  main

import (
  "bufio"
  "fmt"
  "os"
)

func main() {
  f,err := os.Open("./test.txt")
  if err != nil {
    fmt.Println(err.Error())
  }
  r := bufio.NewReader(f)
  for {
    s,err := r.ReadString('\n')
    fmt.Println(s)
    if err != nil {
      fmt.Println(err.Error())
      break
    }
  }

}

二、按字节读取

package  main

import (
  "os"
)

func main()  {
  buf := make([]byte,10)
  f,_ := os.Open("./test.txt")
  defer f.Close()
  for {
    n,_ := f.Read(buf)
    if n ==  0 {
      break
    }
    os.Stdout.Write(buf[:n])
  }

}

三、读取全部内容

package main

import (
  "fmt"
  "io/ioutil"
  "os"
)

func main() {
  f, _ := os.OpenFile("hhh.sh", os.O_RDONLY,0600)
  defer f.Close()
  if err !=nil {
    fmt.Println(err.Error())
  } else {
    contentByte,_:=ioutil.ReadAll(f)
    fmt.Println(string(contentByte))
  }
}