将字节切片转换为 io.Reader

Question

In my project, I have a byte slice from a request's response.

defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
    log.Println("StatusCode为" + strconv.Itoa(resp.StatusCode))
    return
}

respByte, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Println("fail to read response data")
    return
}

This works, but if I want to get the response's body for io.Reader , how do I convert? I tried the newreader/writer but wasn't successful.

Answer 1

To get a type that implements io.Reader from a []byte slice, you can use bytes.NewReader in the bytes package:

r := bytes.NewReader(byteData)

This will return a value of type bytes.Reader which implements the io.Reader (and io.ReadSeeker ) interface.

Don't worry about them not being the same "type". io.Reader is an interface and can be implemented by many different types. To learn a little bit more about interfaces in Go, read Effective Go: Interfaces and Types .

Answer 2

r := strings(byteData)

这也适用于将[]byte转换为io.Reader