.net 图片处理(asp批量上传图片)

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>

.net 图片处理(asp批量上传图片)

.net 图片处理(asp批量上传图片)

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;

}

}

}

 

 

.net 图片处理(asp批量上传图片)

.net 图片处理(asp批量上传图片)

4、最后奉上Demo

https://files.cnblogs.com/files/lengzhan/ImgJcrop.zip

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