java通过commons-fileupload实现多张图片的上传（jsp页面）

<div id="middle">
                  <div id="form">
                  <form action="ProductInfoServlet?tag=add" method="post" enctype="multipart/form-data" >
                    <h2>三只松鼠--新增</h2>
                   <table align="center">
                   <tr>
                   <td width="90px"  class="td">类型：</td>
                   <td width="200px" >
                     <select name="typename">
                          <option>---请选择--</option>
                          <c:forEach items="${tlist }" var="type" varStatus="status">
                          <option value="${type.typeId}">${type.typeName }</option>
                          </c:forEach>
                         </select>
                    </td>
                   </tr>
                   <tr>
                   <td width="90px"  class="td">品牌：</td>
                   <td width="200px" >
                     <select name="brand">
                          <option>---请选择--</option>
                          <option >三只松鼠</option>
                         </select>
                    </td>
                   </tr>
                    <tr>
                   <td width="90px"  class="td">名称：</td>
                   <td>
                   <input type="text" name="produceName" id="name">
                    </td>
                   </tr>
                    <tr>
                   <td width="90px"  class="td">详情介绍：</td>
                   <td>
                   <textarea cols="20px" rows="1px" name="details"></textarea>
                    </td>
                   </tr>
                   <tr>
                   <td width="90px"  class="td">价格：</td>
                   <td>
                  <input type="text" name="price" id="price">
                    </td>
                   </tr>
                   <tr>
                   <td width="90px"  class="td">库存：</td>
                   <td>
                  <input type="text" name="stock" id="price">
                    </td>
                   </tr>
                   <tr>
                   <td width="90px"  class="td">大图:</td>
                   <td>
                  <input type="file" name="bigfile" id="price">
                    </td>
                   </tr>
                   <tr>
                   <td width="90px"  class="td">小图1:</td>
                   <td>
                  <input type="file" name="smallfile1" id="price">
                    </td>
                   </tr>
                   <tr>
                   <td width="90px"  class="td">小图2:</td>
                   <td>
                  <input type="file" name="smallfile2" id="price">
                    </td>
                   </tr>
                    <tr>
                   <td width="90px"  class="td">小图3:</td>
                   <td>
                  <input type="file" name="smallfile3" id="price">
                    </td>
                   </tr>
                   <tr>
                   <td colspan="2"><input type="submit" value="新增">   <input type="button" value="取消"></td>
                   </tr>
                    </table>
                 </form>
                 </div>
             </div>

<style type="text/css">
    #middle
  {
    width:100%;
    height:600px;
    border:1px #000000;
    background-image:url(media/image/bg/2.jpg);
    color:#FFF;
    padding-top:110px;
    }
    h2{ 
   text-align:center;
   padding-top:10px;
  }
    #form
  {
     text-align:center;
     border: #999 1px solid;
     height:560px;
     width:600px;
     margin:0px auto;
     background-color:#ACACAC;
     opacity:0.02px;
     box-shadow:0px 0px 100px;
  }
   #form .td
   {
     font-size:18px;
     font-weight:bolder;
   }
     #form td
   {
         padding-top:10px; 
     }
    </style>