如何使用Golang框架处理文件上传和下载？

import (
    "encoding/json"
    "io"
    "net/http"

    "github.com/google/uuid"
)

// handleFileUpload handles file upload requests
func handleFileUpload(w http.ResponseWriter, r *http.Request) {
    // Parse multipart form
    if err := r.ParseMultipartForm(32 << 20); err != nil {
        http.Error(w, "Error parsing form", http.StatusBadRequest)
        return
    }

    // Get file from form
    file, header, err := r.FormFile("file")
    if err != nil {
        http.Error(w, "Error getting file", http.StatusBadRequest)
        return
    }

    // Generate a unique filename
    filename := uuid.New().String() + "-" + header.Filename

    // Save file to disk
    destination, err := os.Create(filename)
    if err != nil {
        http.Error(w, "Error saving file", http.StatusInternalServerError)
        return
    }
    defer destination.Close()

    // Copy file data to disk
    if _, err := io.Copy(destination, file); err != nil {
        http.Error(w, "Error copying file data", http.StatusInternalServerError)
        return
    }

    // Respond with success message
    json.NewEncoder(w).Encode(map[string]string{"message": "File uploaded successfully"})
}

import (
    "io"
    "net/http"

    "github.com/gin-gonic/gin"
)

// handleFileDownload handles file download requests
func handleFileDownload(c *gin.Context) {
    // Get file path from context
    filePath := c.Param("filepath")

    // Open file for reading
    file, err := os.Open(filePath)
    if err != nil {
        c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
        return
    }
    defer file.Close()

    // Create FileResponse
    c.FileResponse(200, filePath, file)
}

git clone https://github.com/username/file-upload-download-service