图片压缩以及解析方法

图片压缩

1.调用：var result = PictureService.Upload(System.Web.HttpContext.Current.Request, 20);

2.定义：

public static FileResult Upload(HttpRequest request, int fileSize)
        {
            var result = new FileResult { IsError = true };

            fileSize = 10 * 1024 * 1024;
            //const int fileSize = 10 * 1024 * 1024;

            var files = request.Files;

            //定义允许上传的文件扩展名
            var extType = new Hashtable
                        {
                            {"image", "gif,jpg,jpeg,png,bmp"},
                            {"file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2,apk"}
                        };
            //验证文件类型，是image或者file
            var dirName = request.Form["fileType"];
            if (string.IsNullOrEmpty(dirName))
            {
                dirName = "image";
            }

            if (files.Count < 0)
            {
                result.ErrMsg = "请选择文件。";
                return result;
            }
            else
            {
                for (var i = 0; i < files.Count; i++)
                {
                    var fileName = files[i].FileName;
                    var fileExt = Path.GetExtension(fileName).ToLower();

                    if (files[i].InputStream.Length > fileSize)
                    {
                        result.ErrMsg = "上传文件大小超过限制。";
                        return result;
                    }
                    if (string.IsNullOrWhiteSpace(fileExt))
                    {
                        result.ErrMsg = "上传文件扩展名是不允许的扩展名。 只允许" + ((string)extType[dirName]) + "格式。";
                        return result;
                    }

                    var imageBytes = new byte[files[i].ContentLength];

                    files[i].InputStream.Read(imageBytes, 0, imageBytes.Length);
                    files[i].InputStream.Close();

                    //获取文件保存路径
                    var savePath = string.IsNullOrWhiteSpace(request.Form["path"]) ? "H5Default" : request.Form["path"];
                    switch (savePath)
                    {
                        case "H5Default":
                            savePath = UploadPathEnum.H5Default.ToString();
                            break;
                        case "H5Circle":
                            savePath = UploadPathEnum.H5Circle.ToString();
                            break;
                        case "H5Diary":
                            savePath = UploadPathEnum.H5Diary.ToString();
                            break;
                        case "H5Product":
                            savePath = UploadPathEnum.H5Product.ToString();
                            break;
                        case "H5Advert":
                            savePath = UploadPathEnum.H5Advert.ToString();
                            break;
                        case "News":
                            savePath = "News";
                            break;
                        default:
                            result.ErrMsg = "上传文件目录不存在。";
                            return result;
                    }

                    result = dirName == "image" ? UploadImg(request, imageBytes, savePath) : UploadFile(request, imageBytes, savePath);
                }
            }
            return result;
        }

3.Upload Img:

    /// <summary>
        /// 上传图片方法
        /// </summary>
        /// <param name="request">请求</param>
        /// <param name="imageBytes">图片大小</param>
        /// <param name="savePath">上传路径</param>
        /// <returns></returns>
        protected static FileResult UploadImg(HttpRequest request, byte[] imageBytes, string savePath)
        {
            var result = new FileResult { IsError = true };
            try
            {
                Guid pid;
                var load = UploadHelper.UpLoadImg(imageBytes, savePath, out pid);
                if (!load.IsError)
                {
                    //var flag = InsertData(request, load.Data.ToString(), pid);

                    result.Data = load.Data;
                    result.IsError = false;
                }
            }
            catch (Exception ex)
            {
                result.ErrMsg = ex.Message;
            }
            return result;
        }

4.图片缩略

public static FileResult UpLoadImg(byte[] imageByte, string direetory, out Guid pid)
        {
            var result = new FileResult() { IsError = true };
            pid = Guid.NewGuid();

            try
            {
                var soapClient = new AjaxImgSoapClient();
                //调用服务上传图片

                var filepath = string.Empty;

                switch (direetory)
                {
                    case "H5Default":
                        //case "H5Advert":
                        filepath = soapClient.UpLoadImg(imageByte, direetory, pid.ToString());
                        break;
                    case "H5Advert":
                        filepath = soapClient.UpLoadImgSaveThumbnail(imageByte, direetory, false, false);
                        break;
                    default:
                        filepath = soapClient.UpLoadImgSaveThumbnail(imageByte, direetory, true, true);
                        break;
                }

                if (string.IsNullOrWhiteSpace(filepath))
                {
                    result.ErrMsg = "上传图片失败!";
                    return result;
                }
                else
                {
                    result.Data = filepath;
                }

                result.IsError = false;
            }
            catch (Exception ex)
            {
                result.ErrMsg = ex.Message;
            }
            return result;
        }

5 解析：

pics = base.GetThumbnailPicture(pics, Thumbnail.FourHundred);

 /// <summary>
        /// 获取新的缩略图图片路径【路径例子：http://files.meb.com//Pictures/H5/Product/20150828112321116.jpg】
        /// </summary>
        /// <param name="sourceImagePath">原图片路径</param>
        /// <param name="thumbnail">需要生成的图片缩略图大小</param>
        /// <param name="outSourceImagePath">图片原路径[如果此图片路径处理不正确，这里会进行相应处理，并返回]</param>
        /// <returns></returns>
        public string GetThumbnailPicture(string sourceImagePath, Thumbnail thumbnail)
        {
            if (sourceImagePath == null)
            {
                return string.Empty;
            }
            //return ImageSite.TrimEnd('/') + "/" + sourceImagePath.Replace(ImageSite, string.Empty).Replace(FilesDomain, string.Empty).TrimStart('/');
            if (!sourceImagePath.ToUpper().Contains("NEWS") && !sourceImagePath.ToUpper().Contains("PRODUCT"))
            {
                return ImageSite.TrimEnd('/') + "/" + sourceImagePath.Replace(ImageSite, string.Empty).Replace(FilesDomain, string.Empty).TrimStart('/').Replace(AliImageSite, string.Empty).TrimStart('/');
            }
            string outSourceImagePath = sourceImagePath;
            if (string.IsNullOrEmpty(sourceImagePath) || thumbnail == Thumbnail.Default) { return sourceImagePath; }
            //移除全路径部分
            outSourceImagePath = outSourceImagePath.Replace(ImageSite, string.Empty).Replace(FilesDomain, string.Empty).Replace(AliImageSite, string.Empty).TrimStart('/');
            //获取最后级目录索引
            int lastDictionaryIndex = outSourceImagePath.LastIndexOf("/");
            //文件名
            string headDictionary = string.Empty;
            string fileName = string.Empty;
            string thumbnailDictionary = string.Empty;
            if (lastDictionaryIndex > -1)
            {
                headDictionary = outSourceImagePath.Substring(0, lastDictionaryIndex);
                fileName = outSourceImagePath.Substring(lastDictionaryIndex);
            }
            if (thumbnail == Thumbnail.FourHundred)
            {
                thumbnailDictionary = "400_400";
            }
            if (thumbnail == Thumbnail.SixHundred)
            {
                thumbnailDictionary = "600_600";
            }
            if (thumbnail == Thumbnail.MoreThanOneThousand)
            {
                thumbnailDictionary = "1250_1250";
            }
            //如果最后一级目录包含default则替换为空，连接上目标尺寸目录。如果不存在则直接连接目标目录
            if (headDictionary.ToLower().LastIndexOf("default") >= 0)
            {
                headDictionary = headDictionary.ToLower().Substring(0, headDictionary.ToLower().LastIndexOf("default"));
            }
            //组建新路径
            return ImageSite.TrimEnd('/') + "/" + headDictionary.TrimStart('/').TrimEnd('/') + "/" + thumbnailDictionary.TrimStart('/').TrimEnd('/') + "/" + fileName.TrimStart('/');
        }