asp.net实现图片在线上传并在线裁剪
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）
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<%@
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
xmlns="http://www.w3.org/1999/xhtml">
<head
runat="server">
<title>在线裁剪</title>
<link
href="Scripts/jcrop/jquery.Jcrop.css" rel="stylesheet" type="text/css" />
<link
href="Scripts/uploadify-v3.1/uploadify.css" rel="stylesheet" type="text/css" />
<script
src="Scripts/jquery.1.9.0.min.js" type="text/javascript"></script>
<script
src="Scripts/jcrop/jquery.Jcrop.js" type="text/javascript"></script>
<script
src="Scripts/uploadify-v3.1/jquery.uploadify-3.1.js" type="text/javascript"></script>
<script
type="text/javascript">
$(function
() {
var jcrop_api,
boundx, boundy;
$("#file_upload").uploadify({
"auto": true,
"buttonText": "选择图片",
"swf": "Scripts/uploadify-v3.1/uploadify.swf",
"uploader": "App_Handler/Uploadify.ashx?action=upload",
"fileTypeExts": "*.jpg;
*.jpeg; *.gif; *.png; *.bmp",
"fileTypeDesc": "支持的格式：",
"multi": false,
"removeCompleted": false,
"onUploadStart":
function (file) {
$("#file_upload-queue").hide();
},
"onUploadSuccess":
function (file, data, response) {
var row
= eval("[" +
data + "]");
if (row[0]["status"]
== 0) {
$("#cutimg").html("<img
id=\"imgOriginal\" name=\"imgOriginal\" /><div style=\"overflow: hidden; margin-top: 20px;\"><div style=\"width: 120px; height: 120px; overflow: hidden;\"><img id=\"imgPreview\" /></div><br /><input type=\"button\" id=\"btnImgCut\" onclick=\"cutSaveImg()\"
value=\"裁剪并保存图片\" /></div>");
$("#cutimg
img").each(function
() { $(this).attr("src",
row[0]["message"]);
});
$("#hidImgUrl").val(row[0]["message"]);
$('#imgOriginal').Jcrop({
onChange:
updatePreview,
onSelect:
updatePreview,
aspectRatio:
1,
//maxSize:
[120, 120],
setSelect:
[0, 0, 120, 120]
},
function () {
var bounds
= this.getBounds();
boundx
= bounds[0];
boundy
= bounds[1];
jcrop_api
= this;
});
} else {
alert(row[0]["message"]);
}
}
});
function
updatePreview(c) {
if (parseInt(c.w)
> 0) {
var rx
= 120 / c.w;
var ry
= 120 / c.h;
$("#imgPreview").css({
width:
Math.round(rx * boundx) + "px",
height:
Math.round(ry * boundy) + "px",
marginLeft: "-" +
Math.round(rx * c.x) + "px",
marginTop: "-" +
Math.round(ry * c.y) + "px"
});
}
$("#hidXone").val(c.x);
$("#hidYone").val(c.y);
$("#hidXtwo").val(c.hidXtwo);
$("#hidYtwo").val(c.hidYtwo);
$("#hidImgWidth").val(c.w);
$("#hidImgHeight").val(c.h);
};
});
function
cutSaveImg() {
$.ajax({
type: "post",
url: "App_Handler/Uploadify.ashx?action=cutsaveimg",
data:
{ strImgUrl: $("#imgOriginal")[0].src,
hidXone: $("#hidXone").val(),
hidYone: $("#hidYone").val(),
hidImgWidth: $("#hidImgWidth").val(),
hidImgHeight: $("#hidImgHeight").val()
},
dataType: "html",
success:
function (data) {
var row
= eval("[" +
data + "]");
if (row[0]["status"]
== 0) { }
alert(row[0]["message"]);
}
});
}
</script>
</head>
<body>
<form
id="form1" runat="server">
<div>
<input
type="file" id="file_upload" name="file_upload" />
</div>
<div
id="cutimg">
</div>
<asp:HiddenField
ID="hidXone" runat="server" />
<asp:HiddenField
ID="hidYone" runat="server" />
<asp:HiddenField
ID="hidXtwo" runat="server" />
<asp:HiddenField
ID="hidYtwo" runat="server" />
<asp:HiddenField
ID="hidImgWidth" runat="server" />
<asp:HiddenField
ID="hidImgHeight" runat="server" />
<asp:HiddenField
ID="hidImgUrl" runat="server" />
</form>
</body>
</html>
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Uploadify.ashx（一般处理程序）
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<%@
WebHandler Language="C#" Class="UploadifyUpload" %>
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;
}
}
}
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4、最后奉上Demo
作者：小路 QQ：2490024434
出处：http://www.cnblogs.com/lengzhan/
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