[原创]ASP.NET 自定义文件上传用户控件

原文链接: http://dev.mjxy.cn/a-aspnet-Upload-file.aspx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="UpFile.ascx.cs" Inherits="UpFile" %>
<div style="margin: 10px;">
选择要上传的文件：<br />
<input id="UpLoadFile" type="file" runat="server" />
<input id="Button1" type="button" value="上传" runat="server" onserverclick="Button1_ServerClick" />
<br />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="UpLoadFile"
    ErrorMessage="请选择要上传的文件"></asp:RequiredFieldValidator>
</div>

代码文件如下：

001	using System;

002	using System.Data;

003	using System.Configuration;

004	using System.Collections;

005	using System.Web;

006	using System.Web.Security;

007	using System.Web.UI;

008	using System.Web.UI.WebControls;

009	using System.Web.UI.WebControls.WebParts;

010	using System.Web.UI.HtmlControls;

011	using System.IO;

012

013	/// <summary>

014	/// 水印用户控件

015	/// 作者：成海涛

016	/// 时间：2006-9-21

017	/// E-mail：kingter520@163.com

018	/// 说明：文字水印的位置有待完善，建议用图片水印

019	/// </summary>

020	public partial class UpFile : System.Web.UI.UserControl

021

{

022

023	string _strNewFileFolder = System.Configuration.ConfigurationSettings.AppSettings["FCKeditor:BasePath"];      //文件上传的目录

024	string _UploadDeniedExtensions = System.Configuration.ConfigurationSettings.AppSettings["UploadDeniedExtensions"];   //只允许上传的文件扩展名 ".(jpg|gif|jpeg|png)$"

025	int _NewImgpx = 120;                            //缩略图尺寸

026	bool _IsThumb = true;                           //是否启用缩略图 true：启用  false：不启用

027	bool _IsWatermark = false;                       //是否启用水印 true：启用  false：不启用

028	int _WatemarkPos = 9;                           //水印位置 1：左上角 2：水平居中垂直顶部 3：右上角 4：垂直居中水平靠左 5：居中 6：垂直居中水平靠右 7：左下角 8：水平居中垂直底部 9：右下角

029	string _WatemarkType = "txt";                   //水印类型 txt：文字水印 img：图片水印

030	string _WatemarkText = "西部数字网 www.idcwest.net";            //水印文字

031	string _WatemarkFont = "Verdana";               //水印字体

032	string _WatemarkTextColor = "#FFFFFF";          //水印文字颜色

033	int _WatemarkFontSize = 18;                     //水印文字像素

034	string _WatemarkImg = "mark.png";               //水印图片

035	int _FileSizeMax = 2048;                        //限制上传文件大小

036

037	string _srcFileName;                            //上传文件原文件名

038	string _srcFileExtension;                       //扩展名

039	string _strFileName;                            //新文件名

040	string _strFileType;                            //文件类型

041	int _strFileSize;                               //文件大小 单位 KB

042	int _OldFileWidth;                              //原图宽度

043	int _OldFileHeight;                             //原图高度

044	int _NewImgHeight;                              //缩略图高度

045	int _NewImgWidth;                               //缩略图宽度

046	string _thumbImgPath;                           //缩略图完整地址

047	string _imagePath;                              //返回上传图片完整地址

048	string _errMsg;                                 //返回出错提示

049

050	string _strFileFolder;

051	int _WatemarkPosX = 5;

052	int _WatemarkPosY = 5;

053

054	DateTime now = DateTime.Now;                    //取当前的时间到DateTime类的对象now中

055

056	public delegate void OnUploadEvent(object sender, EventArgs e);

057	public event OnUploadEvent OnUpload;

058

059	/// <summary>

060	/// 设置文件上传的目录

061	/// </summary>

062	public string NewFileFolder

063

{

064	set { _strNewFileFolder = value; }

065

}

066

067	/// <summary>

068	/// 设置缩略图的尺寸

069	/// </summary>

070	public int NewImgpx

071

{

072	set { _NewImgpx = value; }

073

}

074

075	/// <summary>

076	/// 是否启用缩略图

077	/// </summary>

078

///

079	public bool IsThumb

080

{

081	set { _IsThumb = value; }

082

}

083

084	/// <summary>

085	/// 是否启用水印

086	/// </summary>

087	public bool IsWatermark

088

{

089	set { _IsWatermark = value; }

090

}

091

092	/// <summary>

093	/// 设置水印位置

094	/// </summary>

095	public int WatemarkPos

096

{

097	set { _WatemarkPos = value; }

098

}

099

100	/// <summary>

101	/// 设置水印类型 txt：文字水印 img：图片水印

102	/// </summary>

103	public string WatemarkType

104

{

105	set { _WatemarkType = value; }

106

}

107

108	/// <summary>

109	/// 设置水印文字

110	/// </summary>

111	public string WatemarkText

112

{

113	set { _WatemarkText = value; }

114

}

115

116	/// <summary>

117	/// 设置水印字体

118	/// </summary>

119	public string WatemarkFont

120

{

121	set { _WatemarkFont = value; }

122

}

123

124	/// <summary>

125	/// 设置水印字号

126	/// </summary>

127	public int WatemarkFontSize

128

{

129	set { _WatemarkFontSize = value; }

130

}

131

132	/// <summary>

133	/// 设置水印文字颜色

134	/// </summary>

135	public string WatemarkTextColor

136

{

137	set { _WatemarkTextColor = value; }

138

}

139	/// <summary>

140	/// 设置水印图片

141	/// </summary>

142	public string WatemarkImg

143

{

144	set { _WatemarkImg = value; }

145

}

146	/// <summary>

147	/// 设置上传文件的限制大小

148	/// </summary>

149	public int FileSizeMax

150

{

151	set { _FileSizeMax = value; }

152

}

153

154	/// <summary>

155	/// 上传文件原文件名

156	/// </summary>

157	public string OldFileName

158

{

159	get { return _srcFileName; }

160

}

161

162	/// <summary>

163

/// 扩展名

164	/// </summary>

165	public string OldFileExtension

166

{

167	get { return _srcFileExtension; }

168

}

169

170	/// <summary>

171

/// 新文件名

172	/// </summary>

173	public string FileName

174

{

175	get { return _strFileName; }

176

}

177

178	/// <summary>

179

/// 文件类型

180	/// </summary>

181	public string FileType

182

{

183	get { return _strFileType; }

184

}

185	/// <summary>

186	/// 文件大小 单位 KB

187	/// </summary>

188	public int FileSize

189

{

190	get { return _strFileSize; }

191

}

192

193	/// <summary>

194

/// 原图宽度

195	/// </summary>

196	public int OldFileWidth

197

{

198	get { return _OldFileWidth; }

199

}

200

201	/// <summary>

202

/// 原图高度

203	/// </summary>

204	public int OldFileHeight

205

{

206	get { return _OldFileHeight; }

207

}

208

209	/// <summary>

210

/// 缩略图高度

211	/// </summary>

212	public int ThumbImageHeight

213

{

214	get { return _NewImgHeight; }

215

}

216

217	/// <summary>

218

/// 缩略图宽度

219	/// </summary>

220	public int ThumbImageWidth

221

{

222	get { return _NewImgWidth; }

223

}

224

225	/// <summary>

226	/// 缩略图完整地址

227	/// </summary>

228	public string ThumbImagePath

229

{

230	get { return _thumbImgPath; }

231

}

232

233	/// <summary>

234	/// 返回上传图片完整地址

235	/// </summary>

236	public string FilePath

237

{

238	get { return _imagePath; }

239

}

240

241	/// <summary>

242	/// 返回出错提示

243	/// </summary>

244	public string ErrMsg

245

{

246	get { return _errMsg; }

247

}

248

249	protected void Page_Load(object sender, EventArgs e)

250

{

251	_WatemarkImg = Server.MapPath("~/") + _WatemarkImg; //水印图片

252

253

//文件上传的目录

254	_strNewFileFolder += now.Year.ToString() + "/";

255	_strFileFolder = Server.MapPath("~/") + _strNewFileFolder;

256

}

257

258	protected void Button1_ServerClick(object sender, EventArgs e)

259

{

260

//随机数

261	Random Rnd = new Random();

262	int strRnd = Rnd.Next(1, 99);

263

264

//新文件名称

265	string strFileName = now.Month.ToString() + now.Day.ToString() + now.Hour.ToString() + now.Minute.ToString() + now.Second.ToString() + strRnd.ToString();

266

267	if (UpLoadFile.PostedFile.ContentLength != 0)  //判断选取对话框的文件长度是否为0

268

{

269

270	//检测目录是否存在，不存在就建立目录

271	if (!Directory.Exists(_strFileFolder))

272

{

273	Directory.CreateDirectory(_strFileFolder);

274

}

275

276

//获取原文件信息

277	string srcFile = UpLoadFile.PostedFile.FileName;

278	string srcFileName = Path.GetFileName(srcFile.ToString());          //原文件名

279	string srcFileExtension = Path.GetExtension(srcFile.ToString());    //原文件扩展名

280	string strFileType = UpLoadFile.PostedFile.ContentType;             //获得文件类型

281	int strFileSize = UpLoadFile.PostedFile.ContentLength / _FileSizeMax;       //获得文件体积大小，单位KB

282

283

284	//限制文件上传大小

285	if (strFileSize > _FileSizeMax)

286

{

287	_errMsg = "上传文件超过限制，文件大小限制为：" + _FileSizeMax + " KB";

288	Response.Write("<script>alert('" + _errMsg + "')</script>");

289

return;

290

}

291	if (!System.Text.RegularExpressions.Regex.IsMatch(srcFileExtension, _UploadDeniedExtensions, System.Text.RegularExpressions.RegexOptions.IgnoreCase))

292

{

293	_errMsg = "不允许上传此类型的文件";

294	Response.Write("<script>alert('" + _errMsg + "')</script>");

295

return;

296

}

297	strFileName = strFileName + srcFileExtension;                       //新文件名包括扩展名

298	_imagePath = _strNewFileFolder + strFileName;                       //返回上传后的图片路径

299

300

//输出

301	_srcFileName = srcFileName;                 //上传文件原文件名

302	_srcFileExtension = srcFileExtension;       //扩展名

303	_strFileName = strFileName;                 //新文件名

304	_strFileType = strFileType;                 //文件类型

305	_strFileSize = strFileSize;                 //文件大小 单位 KB

306

307

//判断是否为图片

308	bool IsImg = true;

309	if (UpLoadFile.PostedFile.ContentType.IndexOf("image") < 0)

310

{

311	IsImg = false;

312

}

313

314	if (IsImg == false)

315

{

316	UpLoadFile.PostedFile.SaveAs(_strFileFolder + strFileName);          //非图片文件上传

317

}

318

else

319

{

320

//加水印并上传

321	if (_IsWatermark == true)

322

{

323

324	System.Drawing.Image image;

325	if (strFileType == "image/bmp") //bmp图片格式

326	image = System.Drawing.Bitmap.FromStream(UpLoadFile.PostedFile.InputStream);

327

else

328	image = System.Drawing.Image.FromStream(UpLoadFile.PostedFile.InputStream);

329

330	System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);

331

332	if (_WatemarkType == "txt") //文字水印

333

{

334

335	//将图片绘制到graphics中

336	g.DrawImage(image, 0, 0, image.Width, image.Height);

337

//设置文字的属性

338	System.Drawing.Font f = new System.Drawing.Font(_WatemarkFont, _WatemarkFontSize, System.Drawing.GraphicsUnit.Pixel);

339

340

341	//判断图片的大小，如果图片过小，不写文字

342	if (image.Width < 200)

343	//在此设定在图片上所加的文字

344	_WatemarkText = "";

345

346	//写的文字的起始位置，x,y坐标

347	_WatemarkPosX = 5;

348	_WatemarkPosY = 5;

349

//设置字体的颜色

350	System.Drawing.Brush b = new System.Drawing.SolidBrush(System.Drawing.ColorTranslator.FromHtml(_WatemarkTextColor));

351

352	System.Drawing.StringFormat fm = new System.Drawing.StringFormat();

353

354

//水印放置左上角

355	if (_WatemarkPos == 1)

356

{

357	fm.Alignment = System.Drawing.StringAlignment.Near;

358	fm.LineAlignment = System.Drawing.StringAlignment.Near;

359

}

360

361	//水平居中垂直顶部

362	if (_WatemarkPos == 2)

363

{

364	fm.Alignment = System.Drawing.StringAlignment.Center;

365	fm.LineAlignment = System.Drawing.StringAlignment.Near;

366

}

367

368

//右上角

369	if (_WatemarkPos == 3)

370

{

371	fm.Alignment = System.Drawing.StringAlignment.Far;

372	fm.LineAlignment = System.Drawing.StringAlignment.Near;

373

374

}

375

376	//垂直居中水平靠左

377	if (_WatemarkPos == 4)

378

{

379	fm.Alignment = System.Drawing.StringAlignment.Near;

380	fm.LineAlignment = System.Drawing.StringAlignment.Center;

381

}

382

383

//居中

384	if (_WatemarkPos == 5)

385

{

386	fm.Alignment = System.Drawing.StringAlignment.Center;

387	fm.LineAlignment = System.Drawing.StringAlignment.Center;

388

}

389

390	//垂直居中水平靠右

391	if (_WatemarkPos == 6)

392

{

393	fm.Alignment = System.Drawing.StringAlignment.Far;

394	fm.LineAlignment = System.Drawing.StringAlignment.Center;

395

}

396

397

//左下角

398	if (_WatemarkPos == 7)

399

{

400	fm.Alignment = System.Drawing.StringAlignment.Near;

401	fm.LineAlignment = System.Drawing.StringAlignment.Far;

402

}

403

404	//水平居中垂直底部

405	if (_WatemarkPos == 8)

406

{

407	fm.Alignment = System.Drawing.StringAlignment.Center;

408	fm.LineAlignment = System.Drawing.StringAlignment.Far;

409

}

410

411

//水印放置右下角

412	if (_WatemarkPos == 9)

413

{

414	fm.Alignment = System.Drawing.StringAlignment.Far;

415	fm.LineAlignment = System.Drawing.StringAlignment.Far;

416

}

417

418

419

//写字

420	g.DrawString(_WatemarkText, f, b, new System.Drawing.RectangleF(0, 0, image.Width, image.Height), fm);

421

422	//释放graphics

423	g.Dispose();

424

425	//保存加上水印的图片

426	image.Save(_strFileFolder + strFileName);

427

//释放image

428	image.Dispose();

429

430

}

431	else if (_WatemarkType == "img") //图片水印

432

{

433

434	System.Drawing.Image copyImage = System.Drawing.Image.FromFile(_WatemarkImg);

435

//水印放置左上角

436	if (_WatemarkPos == 1)

437

{

438	_WatemarkPosX = 5;

439	_WatemarkPosY = 5;

440

}

441

442	//水平居中垂直顶部

443	if (_WatemarkPos == 2)

444

{

445	_WatemarkPosX = (image.Width - copyImage.Width) / 2;

446	_WatemarkPosY = 5;

447

}

448

449

//右上角

450	if (_WatemarkPos == 3)

451

{

452	_WatemarkPosX = image.Width - copyImage.Width - 5;

453	_WatemarkPosY = 5;

454

}

455

456	//垂直居中水平靠左

457	if (_WatemarkPos == 4)

458

{

459	_WatemarkPosX = 5;

460	_WatemarkPosY = (image.Height - copyImage.Height) / 2;

461

}

462

463

//居中

464	if (_WatemarkPos == 5)

465

{

466	_WatemarkPosX = (image.Width - copyImage.Width) / 2;

467	_WatemarkPosY = (image.Height - copyImage.Height) / 2;

468

}

469

470	//垂直居中水平靠右

471	if (_WatemarkPos == 6)

472

{

473	_WatemarkPosX = image.Width - copyImage.Width - 5;

474	_WatemarkPosY = (image.Height - copyImage.Height) / 2;

475

}

476

477

//左下角

478	if (_WatemarkPos == 7)

479

{

480	_WatemarkPosX = 5;

481	_WatemarkPosY = image.Height - copyImage.Height - 5;

482

}

483

484	//水平居中垂直底部

485	if (_WatemarkPos == 8)

486

{

487	_WatemarkPosX = (image.Width - copyImage.Width) / 2;

488	_WatemarkPosY = image.Height - copyImage.Height - 5;

489

}

490

491

//水印放置右下角

492	if (_WatemarkPos == 9)

493

{

494	_WatemarkPosX = image.Width - copyImage.Width - 5;

495	_WatemarkPosY = image.Height - copyImage.Height - 5;

496

}

497

498	if (copyImage.Height < image.Height && copyImage.Width < image.Width)

499

{

500	//将水印打印到上传图片上去

501	g.DrawImage(copyImage, new System.Drawing.Rectangle(_WatemarkPosX, _WatemarkPosY, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);

502	//释放graphics

503	g.Dispose();

504

}

505

//保存图片

506	image.Save(_strFileFolder + strFileName);

507

//释放image

508	image.Dispose();

509

}

510

511

}

512

else

513

{

514	UpLoadFile.PostedFile.SaveAs(_strFileFolder + strFileName);          //不加水印上传

515

}

516

517

//获得图片尺寸

518	int OldFileHeight, OldFileWidth;

519	System.Drawing.Image img = System.Drawing.Image.FromStream(UpLoadFile.PostedFile.InputStream);

520	OldFileHeight = img.Height;

521	OldFileWidth = img.Width;

522

523

//创建缩略图

524	if (_IsThumb == true)

525

{

526	int NewImgHeight, NewImgWidth;

527

528	if (OldFileWidth > OldFileHeight)

529

{

530	NewImgWidth = _NewImgpx;

531	NewImgHeight = (int)(OldFileHeight / (float)OldFileWidth * _NewImgpx);

532

}

533

else

534

{

535	NewImgHeight = _NewImgpx;

536	NewImgWidth = (int)(OldFileWidth / (float)OldFileHeight * _NewImgpx);

537

}

538	//如果缩略图的尺寸大于原图尺寸，则用原图片大小

539	if (NewImgHeight >= OldFileHeight && NewImgWidth >= OldFileWidth)

540

{

541	NewImgHeight = OldFileHeight;

542	NewImgWidth = OldFileWidth;

543

}

544	System.Drawing.Image NewImg = img.GetThumbnailImage(NewImgWidth, NewImgHeight, null, System.IntPtr.Zero);

545	NewImg.Save(_strFileFolder + "Thumb_" + strFileName, System.Drawing.Imaging.ImageFormat.Jpeg);

546

547

//返回数据

548	_NewImgHeight = NewImgHeight;                 //缩略图高度

549	_NewImgWidth = NewImgWidth;                  //缩略图宽度

550	_thumbImgPath = _strNewFileFolder + "Thumb_" + strFileName;  //缩略图地址

551

}

552

//返回数据

553	_OldFileWidth = OldFileWidth;    //原图宽度

554	_OldFileHeight = OldFileHeight;  //原图高度

555

556

}

557

}

558

559	this.OnUpload(this, e);

560

561

}

562

}

 具体使用方式：

更多内容参考 ：http://dev.mjxy.cn/a-aspnet-Upload-file.aspx