基于asp.net实现图片在线上传并在线裁剪功能

   <title>在线裁剪</title>  <div> </div><div id="cutimg"> </div>

  using System; using System.Collections; using System.Data; using System.Web; using System.Linq; using System.Web.Services; using System.Web.Services.Protocols; using S<strong style="color:transparent">来源gaodaima#com搞(代@码网</strong>ystem.Web.SessionState; using System.IO; using System.Collections.Generic; using System.Web.UI.WebControls; using System.Text; using System.Drawing; using System.Drawing.Imaging; public class UploadifyUpload : IHttpHandler, IRequiresSessionState { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; context.Response.Charset = "utf-8"; string action = context.Request["action"]; switch (action) { case "upload": //上传图片 upload(context); break; case "cutsaveimg": //裁剪并保存 cutsaveimg(context); break; } context.Response.End(); } /// <summary> /// 上传图片 /// </summary> ///  private void upload(HttpContext context) { HttpPostedFile postedFile = context.Request.Files["Filedata"]; if (postedFile != null) { string fileName, fileExtension; int fileSize; fileName = postedFile.FileName; fileSize = postedFile.ContentLength; if (fileName != "") { fileExtension = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf('.')); string strPath = context.Server.MapPath("/") + "\\App_File\\Upload\\";//设置文件的路径 string strFileName = "upload" + DateTime.Now.ToString("yyyyMMddHHmmss") + fileExtension; string strFileUrl = strPath + strFileName;//保存文件路径 if (!Directory.Exists(strPath)) { Directory.CreateDirectory(strPath); } postedFile.SaveAs(strFileUrl);//先保存源文件 context.Response.Write("{\"status\":0,\"message\":\"/App_File/Upload/" + strFileName + "\"}"); } else { context.Response.Write("{\"status\":1,\"message\":\"上传失败！\"}"); } } else { context.Response.Write("{\"status\":1,\"message\":\"上传失败！\"}"); } } /// <summary> /// 裁剪并保存图片 /// </summary> ///  private void cutsaveimg(HttpContext context) { string strImgUrl = context.Request["strImgUrl"]; string strXone = context.Request["hidXone"]; string strYone = context.Request["hidYone"]; string strImgWidth = context.Request["hidImgWidth"]; string strImgHeight = context.Request["hidImgHeight"]; string[] urls = strImgUrl.Split('/'); string str_url = urls.Last(); try { string strOldFiel = context.Server.MapPath("~/App_File/Upload/"); string strNewFiel = context.Server.MapPath("~/App_File/Cut/"); string strOldUrl = Path.Combine(strOldFiel, str_url); string strNewUrl = Path.Combine(strNewFiel, "cut" + DateTime.Now.ToString("yyyyMMddHHmmss") + "." + str_url.Split('.')[1]); if (!Directory.Exists(strNewFiel)) { Directory.CreateDirectory(strNewFiel); } int intStartX = int.Parse(strXone); int intStartY = int.Parse(strYone); int intWidth = int.Parse(strImgWidth); int intHeight = int.Parse(strImgHeight); CutGeneratedImage(intStartX, intStartY, intWidth, intHeight, strOldUrl, strNewUrl); context.Response.Write("{\"status\":0,\"message\":\"裁剪成功并保存！\"}"); } catch { context.Response.Write("{\"status\":1,\"message\":\"裁剪失败！\"}"); } } /// <summary> /// 裁剪图片 /// </summary> /// 要缩小裁剪图片宽度 /// 要缩小裁剪图片长度 /// 要处理图片路径 /// 处理完毕图片路径 public void CutGeneratedImage(int intStartX, int intStartY, int intWidth, int intHeight, string strOldImgUrl, string strNewImgUrl) { //上传标准图大小 int intStandardWidth = 120; int intStandardHeight = 120; int intReduceWidth = 0; // 缩小的宽度 int intReduceHeight = 0; // 缩小的高度 int intCutOutWidth = 0; // 裁剪的宽度 int intCutOutHeight = 0; // 裁剪的高度 int level = 100; //缩略图的质量 1-100的范围 //获得缩小，裁剪大小 if (intStandardHeight * intWidth / intStandardWidth > intHeight) { intReduceWidth = intWidth; intReduceHeight = intStandardHeight * intWidth / intStandardWidth; intCutOutWidth = intWidth; intCutOutHeight = intHeight; } else if (intStandardHeight * intWidth / intStandardWidth <intHeight) { intReduceWidth = intStandardWidth * intHeight / intStandardHeight; intReduceHeight = intHeight; intCutOutWidth = intWidth; intCutOutHeight = intHeight; } else { intReduceWidth = intWidth; intReduceHeight = intHeight; intCutOutWidth = intWidth; intCutOutHeight = intHeight; } //通过连接创建Image对象 //System.Drawing.Image oldimage = System.Drawing.Image.FromFile(strOldImgUrl); //oldimage.Save(Server.MapPath("tepm.jpg-600")); //oldimage.Dispose(); //缩小图片 Bitmap bm = new Bitmap(strOldImgUrl); //处理JPG质量的函数 ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); ImageCodecInfo ici = null; foreach (ImageCodecInfo codec in codecs) { if (codec.MimeType == "image/jpeg") { ici = codec; break; } } EncoderParameters ep = new EncoderParameters(); ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)level); //裁剪图片 Rectangle cloneRect = new Rectangle(intStartX, intStartY, intCutOutWidth, intCutOutHeight); PixelFormat format = bm.PixelFormat; Bitmap cloneBitmap = bm.Clone(cloneRect, format); //保存图片 cloneBitmap.Save(strNewImgUrl, ici, ep); bm.Dispose(); } public bool IsReusable { get { return false; } } }