一、将SWFUpload与imgAreaSelect一起配置至到项目中
imageareaselect网址:http://odyniec.net/projects/imgareaselect/usage.html
二、分别建立其它文件夹：Pages、JS、Tools、Handlers、Upload
Pages文件夹---------------用来存放静态或动态页面
JS文件夹--------------------用来存放JS文件
Tools文件夹----------------用来存放工具类
Handlers--------------------用来存放一般处理程序
Upload-----------------------用来存放上传成功后的文件
先配置服务器端，再配置前端
在Tools文件夹下新建一个MyTool类
public class MyTool
{
#region ISPicture是判断一个文件是不是图片
public static bool ISPicture(HttpPostedFile file)
{
bool result = false;
string[] exts = "bmp,jpg,png,tiff,gif,pcx,tga,exif,fpx,svg,psd,cdr,pcd,dxf,ufo,eps,ai,raw".Split(new char[] { ',' });
List<string> extList = new List<string>();
extList.AddRange(exts);
string ext = Path.GetExtension(file.FileName).Substring(1).ToLower();
if (extList.Contains(ext))
{
result = true;
}
return result;
}
#endregion
#region GetMD5拿一个流的MD5值
public static string GetMD5(Stream stream)
{
string result = string.Empty;
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] bytes = md5.ComputeHash(stream);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.Length; i++)
{
sb.Append(bytes[i].ToString("X2"));
}
result = sb.ToString();
return result;
}
#endregion
#region 计算一个Image对象的md5值
public static string GetMD5(Image img)
{
string result = string.Empty;
using(MemoryStream ms=new MemoryStream())
{
//首先将Image对象转换为byte[]
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(ms, (object)img);
byte[] imgbytes = ms.ToArray();
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] bytes= md5.ComputeHash(imgbytes);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.Length; i++)
{
sb.Append(bytes[i].ToString("X2"));
}
result = sb.ToString();
}
return result;
}
#endregion
#region CreateDirectory先去判断一个文件夹存不存在，如果不存在的话新建它
public static void CreateDirectory(string path)
{
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
}
#endregion
}
2、在Handlers文件夹中新建UploadFile.ashx
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
HttpPostedFile pfile = context.Request.Files["Filedata"];
//判断是不是图片
if (!MyTool.ISPicture(pfile))
{
return;
}
//准备新的文件名称,准备新的保存路径
string newfilename = MyTool.GetMD5(pfile.InputStream) + Path.GetExtension(pfile.FileName);
string newpath = "/Upload/" + DateTime.Now.ToString("yyyyMMdd");
MyTool.CreateDirectory(context.Request.MapPath(newpath));
string path = Path.Combine(context.Request.MapPath(newpath), newfilename);
//执行保存操作
pfile.SaveAs(path);
context.Response.Write("ok:" + newpath + "/" + newfilename);
}
3、在Pages文件夹中新建UploadFile.htm
HtmlCode
<div id="swfu-placeholder"><!--swfupload文件选择按钮占位符，执行下面的js后，这里将被替换成swfupload上传按钮--></div> <span id="swfu-upload-status"><!--用来显示上传的信息---></span> <div><input type="button" onclick="swfu.startUpload();" value="上传" /></div> <img id="pimg" /><!--用来显示上传成功之后的图片--> <input type="button" id="btnCut" value="剪切"/> <!--用来剪切图片的按钮--> <img id="smallimg"/><!--用来显示剪切后的小图-->
JS
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7"/>
<script src="/swfu/swfupload.js" type="text/javascript"></script>
<script type="text/javascript">
window.onload = function () {
InitSwfUpload();
}
function InitSwfUpload() {
var swfuOption = {//swfupload选项
upload_url: "/Handlers/UploadFile.ashx", //接收上传的服务端url
flash_url: "/swfu/Flash/swfupload.swf", //swfupload压缩包解压后swfupload.swf的url
button_placeholder_id: "swfu-placeholder", //
file_types: "*.jpg;*.jpeg;*.gif;*.png;*.bmp;", //类型
file_size_limit: "20480", //用户可以选择的文件大小，有效的单位有B、KB、MB、GB，若无单位默认为KB
button_width: 215, //按钮宽度
button_height: 45, //按钮高度
button_text: '<span class="btn-txt">选择文件</span>', //按钮文字
button_text_style: '.btn-txt{color: #666666;font-size:20px;font-family:"微软雅黑"}',
button_text_top_padding: 6,
button_text_left_padding: 65,
button_image_url: "/swfu/img/swfu_bgimg.jpg", //按钮背景图片路径
debug: true,
//事件
file_dialog_complete_handler: fileDialogComplete,
upload_progress_handler: uploadProgress,
upload_error_handler: uploadError, //文件上传出错
upload_success_handler: uploadSuccess, //文件上传成功
upload_complete_handler: uploadComplete//文件上传完成，在upload_error_handler或者upload_success_handler之后触发
};
var swfu = new SWFUpload(swfuOption); //初始化并将swfupload按钮替换swfupload占位符
}
function fileDialogComplete(selectedNum, queuedNum) {
if (queuedNum > 0) {//选择并添加到上传队列的文件数大于0
this.startUpload(); //开始上传
this.setButtonDisabled(true); //禁用上传按钮
}
}
function uploadProgress(file, curBytes, totalBytes) {
var statusE = document.getElementById('swfu-upload-status'); //文件上传进度节点
statusE.innerHTML = ['文件名：', file.name, '总尺寸：', totalBytes, 'B已上传：', curBytes, 'B进度：', parseInt((curBytes / totalBytes) * 100), '%'].join('');
}
//上传过程中出错
function uploadError(file, errCode, msg) {
statusE.innerHTML += ['文件[', file.name, ']上传出错，出错代码：[', errCode, ']，出错原因：', msg].join('');
}
//上传成功
function uploadSuccess(file, data) {
//statusE.innerHTML += ['文件[', file.name, ']上传成功，服务器返回信息：', data].join('');
var d = data.split(':');
if (d[0] == 'ok') {
document.getElementById('pimg').setAttribute('src', d[1]); //将上传成功后的图片显示在pimg中
}
}
//上传完成，无论上传过程中出错还是上传成功，都会触发该事件，并且在那两个事件后被触发
function uploadComplete(file) {
statusE.innerHTML += ['文件[', file.name, ']结束上传'].join('');
this.setButtonDisabled(false); //恢复上传按钮
}
</script>
此时可以正常上传图片到服务器，当上传成功后图片会显示在pimg中。
4、接下来就是使用imageAreaSelect进行截图的配置
引用js
<!--jquery-->
<script src="../JS/jquery-1.9.1.js" type="text/javascript"></script>
<!--jquery easyui之imgareaselect相关引用-->
<link href="../jquery.imgareaselect-0.9.10/css/imgareaselect-default.css" rel="stylesheet" type="text/css" />
<script src="../jquery.imgareaselect-0.9.10/scripts/jquery.imgareaselect.pack.js" type="text/javascript"></script>
修改uploadSuccess方法
var pimgpath; //用来存放图片路径
var x = 0; //剪切框横坐标
var y = 0; //剪切框纵坐标
var width = 0; //剪切框宽度
var height = 0; //剪切框高度
//上传成功
function uploadSuccess(file, data) {
//statusE.innerHTML += ['文件[', file.name, ']上传成功，服务器返回信息：', data].join('');
var d = data.split(':');
if (d[0] == 'ok') {
pimgpath = d[1];
$('#pimg').attr('src', d[1]);
this.setButtonDisabled(false); //恢复上传按钮
$('#pimg').imgAreaSelect({
maxWidth: 200, maxHeight: 150, handles: true,
onSelectEnd: function (img, selection) {
x = selection.x1;
y = selection.y1;
width = selection.width;
height = selection.height;
}
});
$('#btnCut').click(function () { //剪切按钮
//alert('图片路径:'+pimgpath+';x='+x+';y='+y+';width='+width+';height:'+height);
$.post('/Handlers/CutPhoto.ashx', { 'pimgpath': pimgpath, 'x': x, 'y': y, 'width': width, 'height': height }, function (data) {
if (typeof (data) != undefined && data != null && data != '') {
$('#smallimg').attr('src', data);
}
})
});
}
}
5、在Handlers文件夹中新建CutPhoto.ashx
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
//(1)接收原图路径、以及Cut的矩形在大图上的左标与该矩形的宽高
string pimgpath;
int x;
int y;
int width;
int height;
pimgpath =context.Request.Form["pimgpath"];
int.TryParse(context.Request.Form["x"],out x);
int.TryParse(context.Request.Form["y"], out y);
int.TryParse(context.Request.Form["width"],out width);
int.TryParse(context.Request.Form["height"],out height);
//(2)判断是否进行处理
if (string.IsNullOrEmpty(pimgpath) || x < 0 || y < 0 || width < 0 || height < 0)
{
return;
}
//(3)准备处理
using(Image img=Image.FromFile(context.Request.MapPath(pimgpath))) //大图
{
using (Bitmap smallimg = new Bitmap(width, height)) //小图画布
{
using (Graphics g = Graphics.FromImage(smallimg)) //画笔
{
//开始使用画笔将要截取的图片画在画布上
//param1-----------原图对象
//param2-----------从原图中画多大
//param3-----------画原图中哪部分
//param4-----------单位
g.DrawImage(img, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
//新的文件名称、保存路径、物理路径、并根据物理路径存在于否创建物理路径
string newfilename = MyTool.GetMD5(smallimg)+Path.GetExtension(pimgpath);
string newpath = "/Upload/" + DateTime.Now.ToString("yyyyMMdd");
string physicsnewpath = context.Request.MapPath(newpath);
MyTool.CreateDirectory(physicsnewpath);
//保存放件
string savepath = Path.Combine(physicsnewpath, newfilename);
smallimg.Save(savepath);
//返回其相对路径
context.Response.Write(newpath+"/"+newfilename);
}
}
}
}
OK~~~~~~