简单的上传图片并生成缩略图代码,Asp.Net代码库,德仔网

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【Asp.Net】简单的上传图片并生成缩略图
作者:Dezai.CN / 发布于2011/4/26/ 659
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<pre><div><span style="color: #000000"><</span><span style="color: #000000">form id</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">form1</span><span style="color: #800000">"</span><span style="color: #000000"> runat</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">server</span><span style="color: #800000">"</span><span style="color: #000000">></span><span style="color: #000000">    </span><span style="color: #000000"><</span><span style="color: #000000">div</span><span style="color: #000000">></span><span style="color: #000000">        </span><span style="color: #000000"><</span><span style="color: #000000">asp:FileUpload ID</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">FileUpload1</span><span style="color: #800000">"</span><span style="color: #000000"> runat</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">server</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">/></span><span style="color: #000000">        </span><span style="color: #000000"><</span><span style="color: #000000">asp:Button ID</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">Button1</span><span style="color: #800000">"</span><span style="color: #000000"> runat</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">server</span><span style="color: #800000">"</span><span style="color: #000000"> Text</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">UP</span><span style="color: #800000">"</span><span style="color: #000000"> OnClick</span><span style="color: #000000">=</span><span style="color: #800000">"</span><span style="color: #800000">Button1_Click</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">/></span><span style="color: #000000">    </span><span style="color: #000000"></</span><span style="color: #000000">div</span><span style="color: #000000">></span><span style="color: #000000"></span><span style="color: #000000"></</span><span style="color: #000000">form</span><span style="color: #000000">></span></div></pre>
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<pre><div><span style="color: #0000ff">　　　　protected</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> Button1_Click(</span><span style="color: #0000ff">object</span><span style="color: #000000"> sender, EventArgs e)        {            UpImageFile(FileUpload1);        }        </span><span style="color: #0000ff">protected</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> UpImageFile(FileUpload fileLoad)        {            </span><span style="color: #0000ff">if</span><span style="color: #000000"> (fileLoad.HasFile)            {                </span><span style="color: #0000ff">string</span><span style="color: #000000"> fileType </span><span style="color: #000000">=</span><span style="color: #000000"> fileLoad.PostedFile.ContentType;                </span><span style="color: #0000ff">if</span><span style="color: #000000"> (fileType </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">image/bmp</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> fileType </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">image/pjpeg</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> fileType </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">image/gif</span><span style="color: #800000">"</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> fileType </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800000">"</span><span style="color: #800000">image/png</span><span style="color: #800000">"</span><span style="color: #000000">)                {                    </span><span style="color: #0000ff">string</span><span style="color: #000000"> loadPath </span><span style="color: #000000">=</span><span style="color: #000000"> fileLoad.PostedFile.FileName;    </span><span style="color: #008000">//</span><span style="color: #008000">等待上传文件的本地路径</span><span style="color: #008000"></span><span style="color: #000000">                    System.Drawing.Image img </span><span style="color: #000000">=</span><span style="color: #000000"> System.Drawing.Image.FromFile(loadPath);                    </span><span style="color: #0000ff">if</span><span style="color: #000000"> (img.Height </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #800080">100</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> img.Width </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #800080">100</span><span style="color: #000000">)                    {                        FileInfo info </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> FileInfo(loadPath);                        </span><span style="color: #0000ff">string</span><span style="color: #000000"> fName </span><span style="color: #000000">=</span><span style="color: #000000"> info.Name;   </span><span style="color: #008000">//</span><span style="color: #008000">获取原文件名</span><span style="color: #008000"></span><span style="color: #000000">                        </span><span style="color: #0000ff">string</span><span style="color: #000000"> fileName </span><span style="color: #000000">=</span><span style="color: #000000"> DateTime.Now.ToString(</span><span style="color: #800000">"</span><span style="color: #800000">yyMMddhhmmss</span><span style="color: #800000">"</span><span style="color: #000000">) </span><span style="color: #000000">+</span><span style="color: #000000"> fName;    </span><span style="color: #008000">//</span><span style="color: #008000">在文件名中加入时间</span><span style="color: #008000"></span><span style="color: #000000">                        </span><span style="color: #0000ff">string</span><span style="color: #000000"> imgPath </span><span style="color: #000000">=</span><span style="color: #000000"> Server.MapPath(</span><span style="color: #800000">"</span><span style="color: #800000">/UpFile/OrImages/</span><span style="color: #800000">"</span><span style="color: #000000">) </span><span style="color: #000000">+</span><span style="color: #000000"> fileName;    </span><span style="color: #008000">//</span><span style="color: #008000">原文件路径</span><span style="color: #008000"></span><span style="color: #000000">                        </span><span style="color: #0000ff">string</span><span style="color: #000000"> thPath </span><span style="color: #000000">=</span><span style="color: #000000"> Server.MapPath(</span><span style="color: #800000">"</span><span style="color: #800000">/UpFile/ThImages/</span><span style="color: #800000">"</span><span style="color: #000000">) </span><span style="color: #000000">+</span><span style="color: #000000"> fileName;     </span><span style="color: #008000">//</span><span style="color: #008000">缩略图路径</span><span style="color: #008000"></span><span style="color: #000000">                        fileLoad.SaveAs(imgPath);   </span><span style="color: #008000">//</span><span style="color: #008000">保存原图片</span><span style="color: #008000"></span><span style="color: #000000">                        MakeThumnail(imgPath, thPath);  </span><span style="color: #008000">//</span><span style="color: #008000">生成缩略图</span><span style="color: #008000"></span><span style="color: #000000">                    }                    </span><span style="color: #0000ff">else</span><span style="color: #000000">                    {                        </span><span style="color: #008000">//</span><span style="color: #008000">图片尺寸太小</span><span style="color: #008000"></span><span style="color: #000000">                    }                }                </span><span style="color: #0000ff">else</span><span style="color: #000000">                {                    </span><span style="color: #008000">//</span><span style="color: #008000">文件格式不对</span><span style="color: #008000"></span><span style="color: #000000">                }            }        }        </span><span style="color: #0000ff">protected</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> MakeThumnail(</span><span style="color: #0000ff">string</span><span style="color: #000000"> orPath, </span><span style="color: #0000ff">string</span><span style="color: #000000"> thPath)        {            System.Drawing.Image img </span><span style="color: #000000">=</span><span style="color: #000000"> System.Drawing.Image.FromFile(orPath);            </span><span style="color: #0000ff">int</span><span style="color: #000000"> width </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #800080">100</span><span style="color: #000000">;    </span><span style="color: #008000">//</span><span style="color: #008000">设置缩略图的宽为100</span><span style="color: #008000"></span><span style="color: #000000">            </span><span style="color: #0000ff">int</span><span style="color: #000000"> height </span><span style="color: #000000">=</span><span style="color: #000000"> img.Height </span><span style="color: #000000">*</span><span style="color: #000000"> width </span><span style="color: #000000">/</span><span style="color: #000000"> img.Width;    </span><span style="color: #008000">//</span><span style="color: #008000">缩略图的高按比例缩小</span><span style="color: #008000"></span><span style="color: #000000">            System.Drawing.Image bitmap </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> System.Drawing.Bitmap(width, height); </span><span style="color: #008000">//</span><span style="color: #008000">创建一个空位图</span><span style="color: #008000"></span><span style="color: #000000">            System.Drawing.Graphics g </span><span style="color: #000000">=</span><span style="color: #000000"> System.Drawing.Graphics.FromImage(bitmap);  </span><span style="color: #008000">//</span><span style="color: #008000">创建画板</span><span style="color: #008000"></span><span style="color: #000000">            g.InterpolationMode </span><span style="color: #000000">=</span><span style="color: #000000"> System.Drawing.Drawing2D.InterpolationMode.High;  </span><span style="color: #008000">//</span><span style="color: #008000">设定为高质量插值</span><span style="color: #008000"></span><span style="color: #000000">            g.SmoothingMode </span><span style="color: #000000">=</span><span style="color: #000000"> System.Drawing.Drawing2D.SmoothingMode.HighQuality;   </span><span style="color: #008000">//</span><span style="color: #008000">指定高质量低速度呈现</span><span style="color: #008000"></span><span style="color: #000000">            g.Clear(Color.Transparent);            g.DrawImage(img, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Rectangle(</span><span style="color: #800080">0</span><span style="color: #000000">, </span><span style="color: #800080">0</span><span style="color: #000000">, width, height));            </span><span style="color: #0000ff">try</span><span style="color: #000000">            {                bitmap.Save(thPath, System.Drawing.Imaging.ImageFormat.Jpeg);   </span><span style="color: #008000">//</span><span style="color: #008000">以JPG格式保存图片</span><span style="color: #008000"></span><span style="color: #000000">            }            </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (System.Exception e)            {                </span><span style="color: #0000ff">throw</span><span style="color: #000000"> e;            }            </span><span style="color: #0000ff">finally</span><span style="color: #000000">            {                img.Dispose();                bitmap.Dispose();                g.Dispose();            }        }</span></div></pre>
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