</form>

<div id="itemDiv" style="display: none;">
  <tr>
   <td width="40" nowrap="nowrap" align="center" >名称</td>
   <td width="180" align="center" >
     <input type="text" name="courseWareName"  style="width:80%;" />
   </td>
   <td width="200" align="center" >
     <input type="file" name="materialFile" class="FormInput" style="width:200px;" />
   </td>
   <td width="40" align="center" ><button class="DeleteButton">删除</button></td>
 </tr>
 </div>

<script language="javascript" >

function addPartItem(){
  $("#partList").append($("#itemDiv").html());
  initInputName();
 }
 
    $(".DeleteButton").live('click',function(event){
  $(this).closest("tr").remove();
  initInputName();
     });
 
 function initInputName(){
  var num=0;
  $("input[name^='materialFile']").each(function(){
   $(this).attr("name","materialFile["+num+"]");
      num++;
   });

</script>

public class CourseActionForm extends ActionForm {
 private static final long serialVersionUID = 1L;
 
 /**
  * 课件名称
  */
 private String[] courseWareName;
 
 /**
  * 课件ID
  */
 private Integer[] courseWareId;
 
 /**
  * 用于保存不定数量的FormFile对象
  */
 private Map materialFiles = new HashMap();

 public FormFile getFile(int i) // 索引属性
 {
  return (FormFile) materialFiles.get(new Integer(i));
 }

 public void setMaterialFile(int i, FormFile formFile) // 索引属性
 { 
  if (formFile.getFileSize() > 0) {// 只有上传文件的字节数大于0，才上传这个文件
    materialFiles.put(new Integer(i), formFile);
  }
 }
 
 public String[] getCourseWareName() {
  return courseWareName;
 }

 public void setCourseWareName(String[] courseWareName) {
  this.courseWareName = courseWareName;
 }

 public int getFileCount() // 获得上传文件的个数
 {
  return materialFiles.size();
 }
 
 public void reset(ActionMapping mapping, HttpServletRequest request) {
  materialFiles.clear();
 }

 public Integer[] getCourseWareId() {
  return courseWareId;
 }

 public void setCourseWareId(Integer[] courseWareId) {
  this.courseWareId = courseWareId;
 }

public class CreateCourseAction
    extends ActionSupport {

public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {

........

for(int i=0;i<courseForm.getFileCount();i++){
      
    FormFile materialFileFormFile = courseForm.getFile(i);//通过此方法可以获取单个formFile值

..........

}

}