go 语言的标准库 io 包主要定义了常用的 io接口，具体如如下：
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type Reader interface {
Read(p []byte) (n int, err error)
}
type Writer interface {
Write(p []byte) (n int, err error)
}
type Closer interface {
Close() error
}
type Seeker interface {
Seek(offset int64, whence int) (int64, error)
}
type ReaderAt interface {
ReadAt(p []byte, off int64) (n int, err error)
}
type ReadSeeker interface {
Reader
Seeker
}
type WriteCloser interface {
Writer
Closer
}
type WriteSeeker interface {
Writer
Seeker
}
type ReadWriter interface {
Reader
Writer
}
type ReadWriteCloser interface {
Reader
Writer
Closer
}
type ReadWriteSeeker interface {
Reader
Writer
Seeker
}
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实现了上面接口的包如下：
- strings.Reader 实现了 io.Reader
- os.File 同时实现了 io.Reader 和 io.Writer
- net.conn 实现了 io.Reader, io.Writer, io.Close
- bufio.Reader/Writer 分别实现了io.Reader 和 io.Writer
- bytes.Buffer 同时实现了 io.Reader 和 io.Writer
- bytes.Reader 实现了io.Reader
ioutil
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func (r io.Reader) ([]byte, error)
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读取文件
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dataBytes, err := ioutil.ReadFile(myFile)
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