Golang如何实现基础的多文件合并与拆分_Golang多文件合并拆分项目实战

func splitFile(filePath string, chunkSize int64) error {
    file, err := os.Open(filePath)
    if err != nil {
        return err
    }
    defer file.Close()
<pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">fileInfo, _ := file.Stat()
fileSize := fileInfo.Size()
totalParts := (fileSize + chunkSize - 1) / chunkSize // 向上取整

buffer := make([]byte, chunkSize)
for i := int64(0); i < totalParts; i++ {
    partSize, err := file.Read(buffer)
    if err != nil && err != io.EOF {
        return err
    }
    if partSize == 0 {
        break
    }

    partName := fmt.Sprintf("%s.part.%03d", filePath, i+1)
    partFile, _ := os.Create(partName)
    partFile.Write(buffer[:partSize])
    partFile.Close()
}
return nil

func mergeFiles(partPattern, outputFile string) error {
    parts, _ := filepath.Glob(partPattern) // 如 "largefile.zip.part.*"
    sort.Strings(parts)
<pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">outFile, _ := os.Create(outputFile)
defer outFile.Close()

buffer := make([]byte, 32*1024)
for _, part := range parts {
    inFile, err := os.Open(part)
    if err != nil {
        return err
    }

    for {
        n, err := inFile.Read(buffer)
        if n > 0 {
            outFile.Write(buffer[:n])
        }
        if err == io.EOF {
            break
        }
        if err != nil {
            inFile.Close()
            return err
        }
    }
    inFile.Close()
}
return nil