Go CopyFile 异常处理 实现

package copyfile

import (
"io"
"os"
)

func CopyFile(dst, src String) (w int64, err error) {
srcFile, err := os.Open(src)
if err != nil {
return
}
defer srcFile.Close()
dstFile, err := os.Open(dst)
if err != nil {
return
}
defer dstFile.Close()
return io.Copy(dstFile, srcFile)
}