上传端

send.go

package main

import (
"fmt"
"io"
"net"
"os"
)

func main() {

fmt.Println("请输入要传输的文件")
var filePath string
fmt.Scan(&filePath)
info,err := os.Stat(filePath)
if err !=nil{
fmt.Println("获取文件属性失败")
}
conn,err := net.Dial("tcp","127.0.0.1:8000")
if err !=nil{
fmt.Println("连接服务器出错")
}
defer conn.Close()
_,err = conn.Write([]byte(info.Name()))
if err!=nil{
fmt.Println("发送文件名出错")
}
buff := make([]byte,1024)
n,err:= conn.Read(buff)
if err !=nil {
fmt.Println(err)
}
str := string(buff[:n])
if "ok" !=str{
fmt.Println("接收文件错误")
}
sendFile(filePath ,conn)

}
func sendFile(filePath string,conn net.Conn) {
buff := make([]byte,1024)
fileHandle,err := os.Open(filePath)//打开文件
if err!=nil{
if err == io.EOF{
fmt.Println("发送文件完毕")
}else{
fmt.Println("打开文件失败")
}

return
}
defer fileHandle.Close() //关闭文件
n,err := fileHandle.Read(buff)//读取文件内容
if err!=nil{
fmt.Println("读取文件失败")
return
}
conn.Write(buff[:n]);
}

接收端（服务器端）recive.go

package main

import (
   "fmt"
   "io"
   "net"
   "os"
)

func main()  {

   lisener,err := net.Listen("tcp","127.0.0.1:8000")
   if err !=nil{
      fmt.Println("监听失败")
   }
   defer lisener.Close()
    conn,err :=lisener.Accept()
    defer  conn.Close()
    if err !=nil{
      fmt.Println("连接失败")
    }
     buffer := make([]byte,1024)
     n,err :=conn.Read(buffer)
     if err!=nil{
      fmt.Println("获取内容失败")
     }
     fileNme :=string(buffer[:n])

     _,err = conn.Write([]byte("ok"))
     if err !=nil{
      fmt.Println("发送内容失败")
     }
      reciveFile(fileNme,conn)

}
func reciveFile(filName string,conn net.Conn){
     file,err := os.Create(filName)
     if err!=err{
      fmt.Println(err)
        return
     }
     buff := make([]byte,1024)
     for{

       n,err := conn.Read(buff)
       if err!=nil{
         if err == io.EOF{
            fmt.Println("文件接收完毕")
            return
         }else {
            fmt.Println("读取内容失败")
         }
       }
       if n==0{
         fmt.Println("文件传输完毕")
          return
       }
       _,err =file.Write([]byte(buff[:n]))
       if err!=nil{
         fmt.Println("写入文件失败")
       }

     }
}