【和博主一起去浪（golang）吧】文件操作详解（三）——简易文件拷贝和缓冲式文件拷贝

package main

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

func main() {
	srcFile, _ := os.OpenFile("C:\\\\Users\\\\11316\\\\Desktop\\\\test.txt",os.O_RDONLY,0666)
	dstFile, _ := os.OpenFile("C:\\\\Users\\\\11316\\\\Desktop\\\\test1.txt",os.O_CREATE|os.O_WRONLY,0666)
	written, err := io.Copy(dstFile, srcFile)
	if err == nil{
		fmt.Println("拷贝成功,字节数=",written)
	}else {
		fmt.Println("拷贝失败，err=",err)
	}
}

package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

func main() {
	//打开源文件
	srcfile, _ := os.OpenFile("C:\\\\Users\\\\11316\\\\Desktop\\\\rice.png", os.O_RDONLY, 0666)
	//	打开目标文件
	dstfile, _ := os.OpenFile("C:\\\\Users\\\\11316\\\\Desktop\\\\test11.png", os.O_CREATE|os.O_WRONLY, 0666)
	defer func() {
		srcfile.Close()
		dstfile.Close()
		fmt.Println("文件已关闭")
	}()

	reader := bufio.NewReader(srcfile)
	writer := bufio.NewWriter(dstfile)
	buffer := make([]byte, 1024)
	for{
		_ , err := reader.Read(buffer)
		if err != nil{
			if err == io.EOF{
				fmt.Println("源文件读取完毕")
				break
			}else {
				fmt.Println("error")
				return
			}
		}else {
			_, err1 := writer.Write(buffer)
			if err1 != nil{
				fmt.Println(err1)
				return
			}
		}

	}
}