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[Java教程]基于ASP.Net +easyUI框架上传图片,实现图片上传,提交表单



<body> <link href="../../Easyui/themes/easyui.css" rel="stylesheet" type="text/css" /> <script charset="utf-8" src="../../Easyui/jquery.easyui.min.js" type="text/javascript"></script> <script charset="utf-8" src="../../Easyui/easyui-lang-zh_CN.js" type="text/javascript"></script> <script charset="utf-8" src="../../Js/jquery.form.js" type="text/javascript"></script> <script type="text/javascript"> //检查图片的格式是否正确,同时实现预览 function setImagePreview(obj, localImagId, imgObjPreview) { var array = new Array('gif', 'jpeg', 'png', 'jpg', 'bmp'); //可以上传的文件类型 if (obj.value == '') { $.messager.alert("让选择要上传的图片!"); return false; } else { var fileContentType = obj.value.match(/^(.*)(\.)(.{1,8})$/)[3]; //这个文件类型正则很有用 ////布尔型变量 var isExists = false; //循环判断图片的格式是否正确 for (var i in array) { if (fileContentType.toLowerCase() == array[i].toLowerCase()) { //图片格式正确之后,根据浏览器的不同设置图片的大小 if (obj.files && obj.files[0]) { //火狐下,直接设img属性 imgObjPreview.style.display = 'block'; imgObjPreview.style.width = '200px'; imgObjPreview.style.height = '150px'; //火狐7以上版本不能用上面的getAsDataURL()方式获取,需要一下方式 imgObjPreview.src = window.URL.createObjectURL(obj.files[0]); } else { //IE下,使用滤镜 obj.select(); var imgSrc = document.selection.createRange().text; //必须设置初始大小 localImagId.style.width = "200px"; localImagId.style.height = "150px"; //图片异常的捕捉,防止用户修改后缀来伪造图片 try { localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc; } catch (e) { $.messager.alert("您上传的图片格式不正确,请重新选择!"); return false; } imgObjPreview.style.display = 'none'; document.selection.empty(); } isExists = true; return true; } } if (isExists == false) { $.messager.alert("上传图片类型不正确!"); return false; } return false; } } //显示图片 function over(imgid, obj, imgbig) { //大图显示的最大尺寸 4比3的大小 400 300 maxwidth = 400; maxheight = 300; //显示 obj.style.display = ""; imgbig.src = imgid.src; //1、宽和高都超过了,看谁超过的多,谁超的多就将谁设置为最大值,其余策略按照2、3 //2、如果宽超过了并且高没有超,设置宽为最大值 //3、如果宽没超过并且高超过了,设置高为最大值 if (img.width > maxwidth && img.height > maxheight) { pare = (img.width - maxwidth) - (img.height - maxheight); if (pare >= 0) img.width = maxwidth; else img.height = maxheight; } else if (img.width > maxwidth && img.height <= maxheight) { img.width = maxwidth; } else if (img.width <= maxwidth && img.height > maxheight) { img.height = maxheight; } }; //保存信息 function submitForm() { //先上传图片后,再提交 upLoadFile(); var test = document.getElementById("test").value = "add"; var tbName = document.getElementById("tbName").value; var idFile = document.getElementById("idFile").value; //先判断是否上传图片之后在提交 $('#ff').form('submit', { url: "../../Handler/add.ashx?tbName=" + tbName + "&idFile=" + idFile + "&test=" + test, dataType: "json", onSubmit: function () { if ($(this).form('validate')) return true; else { return false; } }, success: function (data) { var dataJson = $.parseJSON(data); if (dataJson.success) { $("#add_address").dialog('destroy'); //销毁dialog对象 $.messager.alert("提示", dataJson.msg) $("#dateList").datagrid("reload").datagrid('clearSelections').datagrid('clearChecked'); } else { $("#add_address").dialog('destroy'); //销毁dialog对象 $.messager.alert("提示", dataJson.msg) } } }); } //上传图片 function upLoadFile() { var idFile = document.getElementById("idFile").value; //判断是否选择图片 var options = { type: "POST", url: '../../Handler/InputImg.ashx' //success: showResponse }; // 将options传给ajaxForm $('#ff').ajaxSubmit(options); } </script> <form id="ff" runat="server" method="post"> <table style="width: 422px; margin-top: 20px; height: 91px;"> <tr> <th style="text-align: right; width: 100px;" class="style1"> 链接名称: </th> <td style="text-align: left" class="style1"> <asp:TextBox ID="tbID" runat="server" Style="display: none"></asp:TextBox> <asp:TextBox ID="tbName" runat="server" Width="274px" Height="20px" class="easyui-validatebox" data-options="required:true"></asp:TextBox> </td> </tr> <tr> <th style="text-align: right; " class="style2"> 链接logo: </th> <td class="style3"> <div style="width: 307px; height: 22px;"> 选择图片:<input id="idFile" style="width: 224px" runat="server" name="idFile" onchange="javascript:setImagePreview(this,localImag,preview);" type="file" /> </div> <%--预 览: <div id="localImag"> <img id="preview" onclick="over(preview,divImage,imgbig);" src="" style="width: 200px; height: 150px;" /> </div>--%> </td> </tr> </table> <div style="width: 325px; text-align: center; margin-top: 20px; margin-left: 50px"> <input type="hidden" id="test" name="test" /> <a id="btn_sc" href="javascript:void(0)" class="easyui-linkbutton" onclick="submitForm()"> 上传</a> <a href="Friendly.aspx" class="easyui-linkbutton">取消</a> </div> </form></body>

提交表单的一般处理程序:

BLL.J_Friendly frend = null;    Model.J_Friendly fr = null;    public void ProcessRequest(HttpContext context)    {      context.Response.ContentType = "text/plain";      string command = context.Request["test"].ToString();//前台传的标示值       if (command == "add")      {        AddFrend(context);      }      if (command == "update")      {        UpdateFrend(context);      }    }public void AddFrend(HttpContext context)    {      frend = new BLL.J_Friendly();      fr = new Model.J_Friendly();      string tbName = context.Request.QueryString["tbName"].Trim();      if (frend.Exists("F_Name='" + tbName + "'"))      {        context.Response.Write("{\"msg\":\"添加失败,链接名称与已有的链接名称重复!\",\"success\":false}");        return;      }      else      {        try        {          fr.F_Name = context.Request.QueryString["tbName"].Trim();        }        catch        {          context.Response.Write("{\"msg\":\"添加失败,请核对信息!\",\"success\":false}");          return;        }        try        {          string img = context.Request.QueryString["idFile"].Trim();          if (img == "")          {            context.Response.Write("{\"msg\":\"添加失败,请核对图片信息!\",\"success\":false}");            return;          }          else          {            string str = context.Request.QueryString["idFile"].Trim();            string str1 = str.Remove(0, str.LastIndexOf("\\") + 1);            fr.F_Img = "../../Upload/Images/" + str1;          }        }        catch        {          context.Response.Write("{\"msg\":\"添加失败,请核对信息!\",\"success\":false}");          return;        }      }      if (frend.Add(fr) > 0)      {        context.Response.Write("{\"msg\":\"添加成功!\",\"success\":true}");      }      else      {        context.Response.Write("{\"msg\":\"添加失败,请核对信息!\",\"success\":false}");      }    }

 原型图:

上传图片时,需要jquery.form.js的js文件,下载地址:http://download.csdn.net/detail/jiuqiyuliang/6919517