EasyUi 图片上传

<form id="auditForm" method="post" enctype="multipart/form-data" style="height:930px;">
<table class="mytable">
 <tr>
 <th rowspan="5" width="90">照片</th>
  <td rowspan="5">
  <div id="preview">                 
    <img id="myImg"src="cadre/${custom.picPath}"onerror="this.src='images/photo_icon.png'"
style="width: 102px;height: 102px;" onclick="$('#previewImg').click();"/>
  </div>
 <input type="file" onchange="previewImage(this)" style="display: none;" id="previewImg" name="previewImg">
  </td>
</tr>
</table>
</form>

function previewImage(file) {
    var MAXWIDTH = 90;
    var MAXHEIGHT = 90;
    var div = document.getElementById('preview');
    if (file.files && file.files[0]) {
      div.innerHTML = '<img id=myImg onclick=$("#previewImg").click()>';
      var img = document.getElementById('myImg');
      img.onload = function() {
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        img.width = rect.width;
        img.height = rect.height;
        //                 img.style.marginLeft = rect.left+'px';
        img.style.marginTop = rect.top + 'px';
      }
      var reader = new FileReader();
      reader.onload = function(evt) {
        img.src = evt.target.result;
      }
      reader.readAsDataURL(file.files[0]);
    } else {//兼容IE
      var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
      file.select();
      var src = document.selection.createRange().text;
      div.innerHTML = '<img id=myImg>';
      var img = document.getElementById('myImg');
      img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
      var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
      status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
      div.innerHTML = "<div id=divhead style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
    }
  }
  
  function clacImgZoomParam(maxWidth, maxHeight, width, height) {
    var param = {
      top: 0,
      left: 0,
      width: width,
      height: height
    };
    if (width > maxWidth || height > maxHeight) {
      rateWidth = width / maxWidth;
      rateHeight = height / maxHeight;
      if (rateWidth > rateHeight) {
        param.width = maxWidth;
        param.height = Math.round(height / rateWidth);
      } else {
        param.width = Math.round(width / rateHeight);
        param.height = maxHeight;
      }
    }
    param.left = Math.round((maxWidth - param.width) / 2);
    param.top = Math.round((maxHeight - param.height) / 2);
    return param;
  }

String ctxPath = request.getSession().getServletContext()
          .getRealPath("/")
          + "cadre\\";
      File filePath = new File(ctxPath);
      if (!filePath.exists()) {
        filePath.mkdirs();
      }
 
      MultipartFile file = request.getFile("previewImg");
      if (!file.isEmpty()) {
        String uuid = UUID.randomUUID().toString()
            .replaceAll("\\-", "");// 返回一个随机UUID。
        String filename = file.getOriginalFilename();
        int index = filename.lastIndexOf(".");
        filename = filename.substring(index, filename.length());
        filename = uuid + filename;
        System.out.println("FileName==" + filename);
        item.setPicPath(filename);
        File uploadFile = new File(ctxPath + filename);
        FileCopyUtils.copy(file.getBytes(), uploadFile);
 
      }