文件上传之——用SWF插件实现文件异步上传和头像截取

发布时间：2020-12-15 19:55:19 所属栏目：百科来源：网络整理

导读：之前写过几篇文件上传，那些都不错。今天小编带领大家体会一种新的上传方法，及使用Flash插件实现文件上传。使用Flash的好处就是可以解决浏览器兼容性问题。之前我写的一个快捷复制功能也是利用的Flash。最近一直在用MVC，所以还是以MVC举例；先来张效果图

之前写过几篇文件上传，那些都不错。今天小编带领大家体会一种新的上传方法，及使用Flash插件实现文件上传。

使用Flash的好处就是可以解决浏览器兼容性问题。之前我写的一个快捷复制功能也是利用的Flash。

最近一直在用MVC，所以还是以MVC举例；先来张效果图：

UploadIndex2.cshtml代码：

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
    <title>上传</title>
    <script src="~/SWFUpload/swfupload.js" type="text/javascript"></script>
    <script src="~/SWFUpload/handlers.js" type="text/javascript"></script>
    <script src="~/Scripts/jquery-1.8.2.min.js"></script>
    <script type="text/javascript">
        var swfu;
        window.onload = function () {
            swfu = new SWFUpload({
                // Backend Settings
                upload_url: "@Url.Action("HandlerUpload2","Home")",//上传路径
                post_params: {
                    "ASPSESSID": "<@Session.SessionID>"
                },// File Upload Settings
                file_size_limit: "5 MB",file_types: "*.jpg;*.gif",file_types_description: "JPG Images",file_upload_limit: 0,// Zero means unlimited

                // Event Handler Settings - these functions as defined in Handlers.js
                //  The handlers are not part of SWFUpload but are part of my website and control how
                //  my website reacts to the SWFUpload events.
                swfupload_preload_handler: preLoad,swfupload_load_failed_handler: loadFailed,file_queue_error_handler: fileQueueError,file_dialog_complete_handler: fileDialogComplete,upload_progress_handler: uploadProgress,upload_error_handler: uploadError,upload_success_handler: showData,upload_complete_handler: uploadComplete,// Button settings
                button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png",//设置按钮图片，注意要是连续的四张
                button_placeholder_id: "spanButtonPlaceholder",//设置按钮id
                button_width: 160,button_height: 22,button_text: '<span class="button">请选择上传图片 <span class="buttonSmall">(5 MB Max)</span></span>',button_text_style: '.button { font-family: Helvetica,Arial,sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',button_text_top_padding: 1,button_text_left_padding: 5,// Flash Settings
                flash_url: "/SWFUpload/swfupload.swf",// Relative to this file
                flash9_url: "/SWFUpload/swfupload_FP9.swf",// Relative to this file

                custom_settings: {
                    upload_target: "divFileProgressContainer"
                },// Debug Settings
                debug: false
            });
        }
        //上传成功以后执行该方法.
        function showData(file,serverData) {
            $("#imgSrc").attr("src",serverData);
        }
    </script>
</head>
<body>
    <form id="form1">

        <div id="content">

            <div id="swfu_container" style="margin: 0px 10px;">
                <div>                 
                    <span id="spanButtonPlaceholder"></span>  <!--注意：这个ID要和上面的一致-->                
                </div>                          
             
             
                <img id="imgSrc" /><!---在这里显示上传的图片，这个插件采用的为异步上传-->
            </div>
        </div>
    </form>
</body>
</html>

View Code

后端代码：

     public ActionResult UploadIndex2()
        {
            return View();
        }
       
        [HttpPost]
        public ActionResult HandlerUpload2()
        {
            HttpPostedFileBase file = Request.Files["Filedata"];//获取文件数据.
            string fileName = Path.GetFileName(file.FileName);//获取文件名.
            string fileExt = Path.GetExtension(fileName);    //获取文件类型
            string fullDir = "";
            if (fileExt == ".jpg")
            {
                string dir = "/UploadImage/" + DateTime.Now.Year + "-" + DateTime.Now.Month + "-" + DateTime.Now.Day + "/";
                Directory.CreateDirectory(Path.GetDirectoryName(Server.MapPath(dir)));//如果没有文件目录，创建.
                fullDir = dir + OnLineBooks.App.Common.WebCommon.GetStreamMD5(file.InputStream) + fileExt;//构建了一个完整路径，并且以文件流的MD5值作为文件的名称,解决了文件名称重名问题。
                file.SaveAs(Server.MapPath(fullDir));//文件保存                   
            }
            return Content(fullDir);//返回图片路径
        }

SWFUpload文件下载链接：http://pan.baidu.com/s/1c2xIf5Y 密码：wphd

?上面提到了图片上传，接下来小编带大家实现图像截取，先上图：

前台实现：

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>UploadIndex3</title>
    <link href="~/Content/themes/ui-lightness/jquery-ui-1.8.2.custom.css" rel="stylesheet" />
    <script src="~/SWFUpload/swfupload.js" type="text/javascript"></script>
    <script src="~/SWFUpload/handlers.js" type="text/javascript"></script>
    <script src="~/Scripts/jquery-1.8.2.min.js"></script>
    <script src="~/SWFUpload/jquery-ui-1.8.2.custom.min.js"></script>
    @*<script src="//apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>*@
    <script type="text/javascript">
    var swfu;
    window.onload = function () {
        swfu = new SWFUpload({
            // Backend Settings
            upload_url: "@Url.Action("Cut_upload","Home")?action=up",post_params: {
                "ASPSESSID": "@Session.SessionID"
            },// File Upload Settings
            file_size_limit: "2 MB",file_types: "*.jpg;*.gif",file_types_description: "JPG Images",file_upload_limit: 0,// Zero means unlimited

            // Event Handler Settings - these functions as defined in Handlers.js
            //  The handlers are not part of SWFUpload but are part of my website and control how
            //  my website reacts to the SWFUpload events.
            swfupload_preload_handler: preLoad,// Button settings
            button_image_url: "/SWFUpload/images/XPButtonNoText_160x22.png",button_placeholder_id: "spanButtonPlaceholder",button_width: 160,button_height: 22,button_text: '<span class="button">请选择上传图片 <span class="buttonSmall">(2 MB Max)</span></span>',button_text_style: '.button { font-family: Helvetica,sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',button_text_top_padding: 1,button_text_left_padding: 5,// Flash Settings
            flash_url: "/SWFUpload/swfupload.swf",// Relative to this file
            flash9_url: "/SWFUpload/swfupload_FP9.swf",// Relative to this file

            custom_settings: {
                upload_target: "divFileProgressContainer"
            },// Debug Settings
            debug: false
        });
    }
        //上传成功以后执行该方法.
        var data;
    function showData(file,serverData) {
        //一:创建一个DIV，通过该DIV确定出要截取大小与范围.(实现DIV的拖动与调整大小.)
        //首先将上传成功的图像作为divContent的背景图像.
         data = serverData.split(':');
        if (data[0] == "ok") {
            //设置图片的高度与宽度，注意单位.px
            $("#divContent").css("backgroundImage","url(" + data[1] + ")").css("width",data[2] + "px").css("height",data[3] + "px");
        }
    }
    //拖动红色DIV并且可以调整大小.
    $(function () {
        $("#divCut").resizable({
            containment: "#divContent"
        }).draggable({ containment: "parent" });      //设置拖动  
        $("#btnCut").click(function () {
            CutImage();//截取头像
        });
    });
    function CutImage() {
        //offset():获取元素的绝对坐标 top:纵坐标
        var y = $("#divCut").offset().top - $("#divContent").offset().top;//纵坐标
        var x = $("#divCut").offset().left - $("#divContent").offset().left;
        var width = $("#divCut").width(); //宽度.
        var height = $("#divCut").height();
        //将上面的数据发送到服务端.
        $.post("@Url.Action("Cut_upload","Home")",{ "action": "cut","x": parseInt(x),"y": parseInt(y),"width": parseInt(width),"height": parseInt(height),"imgUrl": data[1] },function (data) {
            $("#imgUrl").attr("src",data);
        })
      

    }

</script>

</head>
<body>
    <form id="form1">
        <div id="content">

            <div id="swfu_container" style="margin: 0px 10px;">
                <div>

                    <span id="spanButtonPlaceholder"></span>

                </div>
                <div id="divFileProgressContainer" style="height: 75px;"></div>

            </div>
            <div id="divContent" style="width:300px; height:300px">
                <div id="divCut" style="width:100px; height:100px; border:1px solid red"></div>
            </div>
            <input type="button" value="头像截取" id="btnCut" />
            <img id="imgUrl" />
        </div>
    </form>
</body>
</html>

后台实现：

    /// <summary>
        /// 截取图像
        /// </summary>
        /// <returns></returns>
        [HttpPost]
        public ActionResult Cut_upload()
        {
            string action = Request["action"];
            if (action == "up")//上传
            {
                HttpPostedFileBase file = Request.Files["Filedata"];//获取文件数据.
                //获取文件名.
                string fileName = Path.GetFileName(file.FileName);
                //获取文件类型
                string fileExt = Path.GetExtension(fileName);
                if (fileExt == ".jpg")
                {
                    //获取上传的图片的流（文件内容），创建一个Image.所以Image的高度与宽度实际上就是上传图片的高度与宽度.
                    using (Image img = Image.FromStream(file.InputStream))
                    {
                        file.SaveAs(Server.MapPath("/UploadImage/" + fileName));                      
                        return Content("ok:/UploadImage/" + fileName + ":" + img.Width + ":" + img.Height);
                    }
                }
            }
            else if (action == "cut")//头像截取
            {
                //1：接收截取头像范围的数据
                int x = Convert.ToInt32(Request.Form["x"]);
                int y = Convert.ToInt32(Request.Form["y"]);
                int width = Convert.ToInt32(Request.Form["width"]);
                int height = Convert.ToInt32(Request.Form["height"]);
                string imgUrl = Request.Form["imgUrl"];
                //2:创建画布，然后将指定范围的图像画到画布上，最后保存画布.
                using (Bitmap map = new Bitmap(width,height))//画布的大小与截取的图像大小一致
                {
                    //为画布创建了一个画笔.
                    using (Graphics g = Graphics.FromImage(map))
                    {
                        //为上传成功的头像创建一个Image
                        using (Image img = Image.FromFile(Server.MapPath(imgUrl)))
                        {//将图像画到画布上.
                            //第一参数:表示对哪张图片进行操作.
                            //二：画多么大
                            //三:画哪一部分.
                            g.DrawImage(img,new Rectangle(0,width,height),new Rectangle(x,y,GraphicsUnit.Pixel);
                            string imgName = Guid.NewGuid().ToString().Substring(0,8);
                            map.Save(Server.MapPath("/UploadImage/" + imgName + ".jpg"));//将Bitmap保存成图片文件                            
                            return Content("/UploadImage/" + imgName + ".jpg");
                        }
                    }
                }
            }
            return Content("");
        }

zj。。。　

（编辑：李大同）

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