基于ASP.NET+easyUI框架實(shí)現(xiàn)圖片上傳功能（表單）

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">
  //檢查圖片的格式是否正確,同時(shí)實(shí)現(xiàn)預(yù)覽
  function setImagePreview(obj, localImagId, imgObjPreview) {
   var array = new Array('gif', 'jpeg', 'png', 'jpg', 'bmp'); //可以上傳的文件類型
   if (obj.value == '') {
    $.messager.alert("讓選擇要上傳的圖片!");
    return false;
   }
   else {
    var fileContentType = obj.value.match(/^(.*)(\.)(.{1,8})$/)[3]; //這個(gè)文件類型正則很有用 
    ////布爾型變量
    var isExists = false;
    //循環(huán)判斷圖片的格式是否正確
    for (var i in array) {
     if (fileContentType.toLowerCase() == array[i].toLowerCase()) {
      //圖片格式正確之后，根據(jù)瀏覽器的不同設(shè)置圖片的大小
      if (obj.files  obj.files[0]) {
       //火狐下，直接設(shè)img屬性 
       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()方式獲取，需要一下方式 
       imgObjPreview.src = window.URL.createObjectURL(obj.files[0]);
      }
      else {
       //IE下，使用濾鏡 
       obj.select();
       var imgSrc = document.selection.createRange().text;
       //必須設(shè)置初始大小 
       localImagId.style.width = "200px";
       localImagId.style.height = "150px";
       //圖片異常的捕捉，防止用戶修改后綴來偽造圖片 
       try {
        localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
        localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
       }
       catch (e) {
        $.messager.alert("您上傳的圖片格式不正確，請(qǐng)重新選擇!");
        return false;
       }
       imgObjPreview.style.display = 'none';
       document.selection.empty();
      }
      isExists = true;
      return true;
     }
    }

    if (isExists == false) {
     $.messager.alert("上傳圖片類型不正確!");
     return false;
    }
    return false;
   }
  }

  //顯示圖片 
  function over(imgid, obj, imgbig) {
   //大圖顯示的最大尺寸 4比3的大小 400 300 
   maxwidth = 400;
   maxheight = 300;

   //顯示 
   obj.style.display = "";
   imgbig.src = imgid.src;

   //1、寬和高都超過了，看誰超過的多，誰超的多就將誰設(shè)置為最大值，其余策略按照2、3 
   //2、如果寬超過了并且高沒有超，設(shè)置寬為最大值 
   //3、如果寬沒超過并且高超過了，設(shè)置高為最大值 

   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() {
   //先上傳圖片后，再提交 
   upLoadFile();
   var test = document.getElementById("test").value = "add";
   var tbName = document.getElementById("tbName").value;
   var idFile = document.getElementById("idFile").value;
   //先判斷是否上傳圖片之后在提交
   $('#ff').form('submit', {
    url: "../../Handler/add.ashx?tbName=" + tbName + "idFile=" + idFile + "test=" + test,
    dataType: "json",
    onSubmit: function () {
     if ($(this).form('validate'))
      return true;
     else {
      return false;
     }
    },
    success: function (data) {
     var dataJson = $.parseJSON(data);
     if (dataJson.success) {
      $("#add_address").dialog('destroy'); //銷毀dialog對(duì)象
      $.messager.alert("提示", dataJson.msg)
      $("#dateList").datagrid("reload").datagrid('clearSelections').datagrid('clearChecked');

     } else {
      $("#add_address").dialog('destroy'); //銷毀dialog對(duì)象
      $.messager.alert("提示", dataJson.msg)
     }
    }
   });
  }


  //上傳圖片 
  function upLoadFile() {
   var idFile = document.getElementById("idFile").value;
   //判斷是否選擇圖片 
   var options = {
    type: "POST",
    url: '../../Handler/InputImg.ashx'
    //success: showResponse 
   };
   // 將options傳給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">
    鏈接名稱：
   /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">
    鏈接logo：
   /th>
   td class="style3">
    div style="width: 307px; height: 22px;">
     選擇圖片:input id="idFile" style="width: 224px" runat="server" name="idFile" onchange="javascript:setImagePreview(this,localImag,preview);"
      type="file" />
    /div>
    %--預(yù) 覽:
    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()">
   上傳/a> 
   a href="Friendly.aspx" class="easyui-linkbutton">取消/a>
 /div>
 /form>
/body>

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();//前臺(tái)傳的標(biāo)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\":\"添加失敗，鏈接名稱與已有的鏈接名稱重復(fù)！\",\"success\":false}");
    return;
   }
   else
   {

    try
    {
     fr.F_Name = context.Request.QueryString["tbName"].Trim();

    }
    catch
    {
     context.Response.Write("{\"msg\":\"添加失敗，請(qǐng)核對(duì)信息！\",\"success\":false}");
     return;
    }
    try
    {
     string img = context.Request.QueryString["idFile"].Trim();
     if (img == "")
     {
      context.Response.Write("{\"msg\":\"添加失敗，請(qǐng)核對(duì)圖片信息！\",\"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\":\"添加失敗，請(qǐng)核對(duì)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\":\"添加失敗，請(qǐng)核對(duì)信息！\",\"success\":false}");
   }
  }