io 包

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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

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接口分析

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• 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,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) 
}