.net 图片处理(net图片处理控件)
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>
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_FileUpload\”;//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
https://files.cnblogs.com/files/lengzhan/ImgJcrop.zip
