1、说明
接上一篇文章uploadify实现多附件上传完成后，又突然用到头像上传并在线裁剪。在网上找个众多例子都没有符合要求的，有一篇文章写的不错，就是文旺老兄写的这篇Asp.Net平台下的图片在线裁剪功能的实现，大家可以看一下，写的真不错。我就是在参考了他的代码下，结合uploadify使用一般处理程序实现了这个功能，写下了这篇在asp.net实现图片在线上传并在线裁剪，有点绕口哈，废话不多说，现奉上代码，供同学们交流参考，有什么不对的地方，望请大家多多提提建议，多谢！多谢！
2、组成
首先说明一下代码实现所用到的技术，仅供参考：
开发工具：vs2010
目标框架：.NET Framework3.5
jcrop：Jcrop.js v0.9.12
Uploadify：uploadify-v3.1
Jquery：jquery-1.9.0.js
最后我会将整个Demo上传，如果同学们的电脑上有开发环境可直接打开项目解决方案运行。
3、代码
Default.aspx（测试页面）
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ImgJcrop._Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html
Uploadify.ashx（一般处理程序）
<%@ WebHandler Language="C#" %>using System;using System.Collections;using System.Data;using System.Web;using System.Linq;using System.Web.Services;using System.Web.Services.Protocols;using System.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> /// <param name="context"></param> 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> /// <param name="context"></param> 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> /// <param name="intWidth">要缩小裁剪图片宽度</param> /// <param name="intHeight">要缩小裁剪图片长度</param> /// <param name="strOldImgUrl">要处理图片路径</param> /// <param name="strNewImgUrl">处理完毕图片路径</param> 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")); //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; } }}
4、最后奉上Demo
ImgJcrop
作者：小路 QQ：2490024434
出处：http://www.cnblogs.com/lengzhan/
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原标题：asp.net实现图片在线上传并在线裁剪
关键词：ASP.NET
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