golang 文件分片上传

下面是一个简单的 Golang 文件分片上传的示例代码：

package main

import (
    "bufio"
    "fmt"
    "io"
    "net/http"
    "os"
)

const chunkSize = 1024 * 1024 // 每个分片的大小

func main() {
    file, err := os.Open("file.txt")
    if err != nil {
        fmt.Println("Failed to open file:", err)
        return
    }
    defer file.Close()

    fileInfo, err := file.Stat()
    if err != nil {
        fmt.Println("Failed to get file info:", err)
        return
    }

    fileSize := fileInfo.Size()
    chunkNum := int(fileSize / chunkSize)
    if fileSize%chunkSize > 0 {
        chunkNum++
    }

    fmt.Println("File size:", fileSize)
    fmt.Println("Chunk size:", chunkSize)
    fmt.Println("Chunk num:", chunkNum)

    fileReader := bufio.NewReader(file)
    for i := 0; i < chunkNum; i++ {
        chunk := make([]byte, chunkSize)
        n, err := fileReader.Read(chunk)
        if err != nil && err != io.EOF {
            fmt.Println("Failed to read file:", err)
            return
        }

        url := fmt.Sprintf("http://localhost:8080/upload?index=%d&total=%d", i, chunkNum)
        req, err := http.NewRequest("PUT", url, bytes.NewReader(chunk[:n]))
        if err != nil {
            fmt.Println("Failed to create request:", err)
            return
        }

        resp, err := http.DefaultClient.Do(req)
        if err != nil {
            fmt.Println("Failed to upload file:", err)
            return
        }

        fmt.Println("Upload response:", resp.Status)
    }
}

此示例代码将文件分成固定大小的分片，然后使用 HTTP PUT 请求上传每个分片。在请求中，使用 `index` 和 `total` 参数指定当前分片的索引和总分片数。你需要根据实际情况修改 URL 和其他参数。