Beego での添付ファイルのアップロード - Web アプリケーションをよりリッチにします

// 控制器代码
func (c *AttachmentController) Post() {
    _, header, err := c.GetFile("att_file")
    if err != nil {
        // 处理上传失败的情况
        c.Data["json"] = map[string]interface{}{
            "code":    1,
            "message": "Upload failed",
        }
    } else {
        // 处理上传成功的情况
        err = c.SaveToFile("att_file", header.Filename)
        if err != nil {
            c.Data["json"] = map[string]interface{}{
                "code":    1,
                "message": "Save file failed",
            }
        } else {
            c.Data["json"] = map[string]interface{}{
                "code":    0,
                "message": "Upload success",
            }
        }
    }
    c.ServeJSON()
}

// 视图代码
<form method="post" enctype="multipart/form-data" action="/attachment/upload">
  <input type="file" name="att_file" required>
  <input type="submit" value="Upload">
</form>

# 支持的文件类型
file_types = ["jpg", "jpeg", "png", "gif", "txt", "doc", "docx", "pdf"]

# 上传文件大小限制
file_size = 10 << 20

# 上传文件目录
attachment_dir = "static/upload"

os.Setenv("file_types", `["jpg", "jpeg", "png", "gif", "txt", "doc", "docx", "pdf"]`)

import (
    "github.com/astaxie/beego/utils/captcha"
    "github.com/astaxie/beego/utils/captcha/drivers"
)

func (c *AttachmentController) Post() {
    f, h, err := c.GetFile("att_file")
    if err != nil {
        // 处理上传失败的情况
        c.Data["json"] = map[string]interface{}{
            "code":    1,
            "message": "Upload failed",
        }
    } else {
        // 处理上传成功的情况
        fileDir := beego.AppConfig.String("attachment_dir")
        fileName := beego.Date(time.Now(), "20060102150405")+filepath.Ext(h.Filename)
        fPath := fileDir + "/" + fileName
        err = c.SaveToFile("att_file", fPath)
        if err != nil {
            c.Data["json"] = map[string]interface{}{
                "code":    1,
                "message": "Save file failed",
            }
        } else {
            c.Data["json"] = map[string]interface{}{
                "code":    0,
                "message": "Upload success",
                "url":     "/"+fPath,
            }
            fUrl := beego.URLFor("AttachmentController.ShowAttachment", ":filename", fileName)
            c.Data["json"].(map[string]interface{})["url"] = fUrl
        }

        // 图片缩放
        scaleWidth := 800 // 等比例缩放至800
        imageCropper := captcha.NewImageCrop(captcha.DriverImaging, fPath)
        err := imageCropper.Resize(scaleWidth)
        if err != nil {
            beego.Error(err)
        }

        // 图片滤镜
        imageFilter := captcha.NewImageFilter(captcha.DriverImaging, fPath)
        err = imageFilter.Hue(-25).Saturation(10).Brightness(-10).Contrast(-5)
        if err != nil {
            beego.Error(err)
        }
    }
    c.ServeJSON()
}

func (c *AttachmentController) ChunkUpload() {
    // 读取表单数据
    reader, _ := c.Ctx.Request.MultipartReader()
    var (
        bigFile *os.File
        noi     int
    )
    for {
        part, err := reader.NextPart()
        if err == io.EOF {
            // 读取完成
            break
        }
        if part.FileName() == "" {
            continue
        }
        fileName := part.FileName()
        bigFile, err = os.OpenFile("static/chunk/"+fileName, os.O_WRONLY|os.O_CREATE, 0666)
        defer bigFile.Close()
        if err != nil {
            c.Data["json"] = map[string]interface{}{
                "code":    1,
                "message": "Create file failed",
            }
            c.ServeJSON()
            return
        }
        buf := make([]byte, 1024*1024) // 1MB的缓存
        for {
            n := 0
            n, err = part.Read(buf)
            noi += n // 总共读取的字节数
            if err != nil {
                if err == io.EOF {
                    break
                } else {
                    c.Data["json"] = map[string]interface{}{
                        "code":    1,
                        "message": "Read file failed",
                    }
                    c.ServeJSON()
                    return
                }
            }
            if _, err = bigFile.Write(buf[:n]); err != nil {
                c.Data["json"] = map[string]interface{}{
                    "code":    1,
                    "message": "Write file failed",
                }
                c.ServeJSON()
                return
            }
        }
    }
    // 返回上传结果
    c.Data["json"] = map[string]interface{}{
        "code":     0,
        "message":  "Upload success",
        "fileSize": noi,
    }
    c.ServeJSON()
}