golang 框架中文件上传的开源实现

golang 中常用的文件上传框架包括：gorilla/mux：轻量级、高性能，适用于高并发应用。cloud storage：谷歌云平台提供的托管文件存储服务，可扩展且可靠。s3 manager：对 amazon s3 提供全面支持，可执行各种操作。

GoLang 框架中文件上传的开源实现

文件上传是 Web 开发中的常见任务。随着 GoLang 的兴起，出现了许多开源库来简化文件上传过程。本文将介绍几个流行的 GoLang 文件上传框架。

带有实战案例的框架

1. Gorilla/mux

• 特点：轻量级、高性能，适用于高并发应用
• 实战案例：

package main

import (
    "fmt"
    "github.com/gorilla/mux"
    "html"
    "log"
    "net/http"
    "os"
)

func main() {
    router := mux.NewRouter()
    router.HandleFunc("/", handlePostFile)
    log.Fatal(http.ListenAndServe(":8080", router))
}

func handlePostFile(w http.ResponseWriter, r *http.Request) {
    // Parse multipart form and store files to disk
    if err := r.ParseMultipartForm(32 << 20); err != nil {
        http.Error(w, "Cannot parse multipart form", http.StatusBadRequest)
        return
    }
    file, handler, err := r.FormFile(r.PostFormValue("filename"))
    if err != nil {
        http.Error(w, "Cannot retrieve file", http.StatusBadRequest)
        return
    }
    f, err := os.OpenFile("./uploads/"+handler.Filename, os.O_WRONLY|os.O_CREATE, 0666)
    if err != nil {
        http.Error(w, "Cannot save file", http.StatusInternalServerError)
        return
    }
    defer f.Close()
    if _, err = io.Copy(f, file); err != nil {
        http.Error(w, "Cannot copy file to disk", http.StatusInternalServerError)
        return
    }
    fmt.Fprintf(w, "File %q uploaded successfully", handler.Filename)
}

2. Cloud Storage

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• 特点：谷歌云平台提供的托管文件存储服务，可扩展且可靠
• 实战案例：

package main

import (
    "context"
    "fmt"
    "github.com/GoogleCloudPlatform/go-cloud-storage/cloudstorage"
    "io"
)

func main() {
    ctx := context.Background()

    // Replace "your-bucket-name" with the name of your bucket
    bucketName := "your-bucket-name"
    // Initialize client
    client, err := cloudstorage.NewClient(ctx)
    if err != nil {
        fmt.Println(err)
        return
    }

    // Upload file
    f := client.Bucket(bucketName).Object("my-file.txt")
    wr := f.NewWriter(ctx)
    if _, err := wr.Write([]byte("Hello, world!")); err != nil {
        fmt.Println(err)
        return
    }
    if err := wr.Close(); err != nil {
        fmt.Println(err)
        return
    }

    fmt.Printf("File uploaded to %s", f.GCSObject.MediaLink)
}

3. S3 Manager

• 特点：对 Amazon S3 提供了全面的支持，可执行各种操作
• 实战案例：

package main

import (
    "context"
    "fmt"
    "io"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/s3/s3manager"
)

func main() {
    ctx := context.Background()

    // Replace "your-bucket-name" with the name of your bucket
    bucket := "your-bucket-name"

    sess := session.Must(session.NewSession(&aws.Config{
        Region: aws.String("us-east-1"), // Replace with your desired region
    }))

    uploader := s3manager.NewUploader(sess)
    f, err := os.Open("my-file.txt")
    if err != nil {
        fmt.Printf("Unable to open file %q, %v", "my-file.txt", err)
        return
    }

    // Upload file
    result, err := uploader.Upload(&s3manager.UploadInput{
        Bucket: &bucket,
        Key:    "my-file.txt",
        Body:   f,
    })
    if err != nil {
        fmt.Printf("Unable to upload file %q, %v", "my-file.txt", err)
        return
    }

    fmt.Printf("File uploaded to %s", result.Location)
}