GoLang standard library - io 分析

io 包

io 包主要定义了与输入输出相关的一些接口，即对输入输出进行了规范化。

常用函数

接口分析

读取数据到p中，如果数据不足len(p)，可以正常返回，也可以带错误返回。

type Reader interface {
Read(p []byte) (n int, err error)
}

将p中数据写入到当前数据流中，并返回写入的字节数

type Writer interface {
Write(p []byte) (n int, err error)
}

- 关闭数据流，网络连接，数据库等

type Closer interface {
Close() error
}

定位文件中指定位置，为下一次读写做准备

type Seeker interface {
Seek(offset int64, whence int) (int64, error)
}

-

type ReadWriter interface {

Reader

Writer

}



-

type ReadCloser interface {

Reader

Closer

}

-

type WriteCloser interface {

Writer

Closer

}

-

type ReadWriteCloser interface {

Reader

Writer

Closer

}

-

type ReadSeeker interface {

Reader

Seeker

}

-

type WriteSeeker interface {

Writer

Seeker

}

-

type ReadWriteSeeker interface {

Reader

Writer

Seeker

}

将r的数据读入到当前数据流中

type ReaderFrom interface {
ReadFrom(r Reader) (n int64, err error)
}

将当前数据流写入到w中

type WriterTo interface {
WriteTo(w Writer) (n int64, err error)
}

-

type ReaderAt interface {

ReadAt(p []byte, off int64) (n int, err error)

}



-

type WriterAt interface {

WriteAt(p []byte, off int64) (n int, err error)

}

-

type ByteReader interface {

ReadByte() (c byte, err error)

}

-

type ByteScanner interface {

ByteReader

UnreadByte() error

}

-

type ByteWriter interface {

WriteByte(c byte) error

}

-

type RuneReader interface {

ReadRune() (r rune, size int, err error)

}

-

type RuneScanner interface {

RuneReader

UnreadRune() error

}

-

type stringWriter interface {

WriteString(s string) (n int, err error)

}