包ioimport "io" 类型作家type Writer interface { Write(p []byte) (n int, err error)}Writer 是封装了基本 Write 方法的接口。Write 将 len(p) 个字节从 p 写入底层数据流。它返回从 p (0 <= n <= len(p)) 写入的字节数以及导致写入提前停止的任何错误。如果 Write 返回 n < len(p)，则它必须返回一个非 nil 错误。写入不得修改切片数据，即使是临时修改。实现不能保留 p。包网导入“网”类型连接type Conn interface { // Read reads data from the connection. // Read can be made to time out and return a Error with Timeout() == true // after a fixed time limit; see SetDeadline and SetReadDeadline. Read(b []byte) (n int, err error) // Write writes data to the connection. // Write can be made to time out and return a Error with Timeout() == true // after a fixed time limit; see SetDeadline and SetWriteDeadline. Write(b []byte) (n int, err error) // Close closes the connection. // Any blocked Read or Write operations will be unblocked and return errors. Close() error // LocalAddr returns the local network address. LocalAddr() Addr // RemoteAddr returns the remote network address. RemoteAddr() Addr // SetDeadline sets the read and write deadlines associated // with the connection. It is equivalent to calling both // SetReadDeadline and SetWriteDeadline. // // A deadline is an absolute time after which I/O operations // fail with a timeout (see type Error) instead of // blocking. The deadline applies to all future I/O, not just // the immediately following call to Read or Write. // // An idle timeout can be implemented by repeatedly extending // the deadline after successful Read or Write calls. // // A zero value for t means I/O operations will not time out. SetDeadline(t time.Time) error // SetReadDeadline sets the deadline for future Read calls. // A zero value for t means Read will not time out. SetReadDeadline(t time.Time) error // SetWriteDeadline sets the deadline for future Write calls. // Even if write times out, it may return n > 0, indicating that // some of the data was successfully written. // A zero value for t means Write will not time out. SetWriteDeadline(t time.Time) error}Conn 是一个通用的面向流的网络连接。多个 goroutine 可以同时调用 Conn 上的方法。func (*IPConn) 写func (c *IPConn) Write(b []byte) (int, error)Write 实现了 Conn Write 方法。它是 io.Writer 接口的实现。Write 将 len(p) 个字节从 p 写入底层数据流。它返回从 p (0 <= n <= len(p)) 写入的字节数 (n) 以及遇到导致写入提前停止的任何 > 错误 (err)。特别是，对于 net.Conn 接口， func (*IPConn) Write 将数据写入连接。可以使写入超时并在固定时间限制后使用 Timeout() == true 返回错误；请参阅 SetDeadline 和 SetWriteDeadline。