如何在 Golang 中将字节切片转换为 io.Reader

io.Readerio.Readerio.Reader

字节切片到 io.Reader

io.Reader

package main

import (
  "bytes"
  "log"
)

func main() {
  data := []byte("this is some data stored as a byte slice in Go Lang!")
  
  // convert byte slice to io.Reader
  reader := bytes.NewReader(data)
  
  // read only 4 byte from our io.Reader
  buf := make([]byte, 4)
  n, err := reader.Read(buf)
  if err != nil {
    log.Fatal(err)
  }
  log.Println(string(buf[:n]))
}

预期输出如下

2023/01/03 07:53:52 this

https://play.golang.org/p/pzTj9J8aJyL

io.Reader 到字节片

io.Reader

package main

import (
  "bytes"
  "log"
  "strings"
)

func main() {
  ioReaderData := strings.NewReader("this is some data stored as a byte slice in Go Lang!")
  
  // creates a bytes.Buffer and read from io.Reader
  buf := &bytes.Buffer{}
  buf.ReadFrom(ioReaderData)
  
  // retrieve a byte slice from bytes.Buffer
  data := buf.Bytes()
  
  // only read the first 4 bytes
  log.Println(string(data[:4]))
}

预期输出如下

2023/01/03 07:55:15 this

https://play.golang.org/p/TPVm7Y7XIus