struts2 文件上传（多文件上传） upload

 （1）前面的的form JSP 页面
 <s:form id="formId" action="/operation/saveCompetitionProductReport.do" enctype="multipart/form-data" theme="simple">
 
 <table>
     <tr>
    <td colspan="4">关注度截图：
         <input type="file" name="pic"/></td>
     </tr>
     <tr>
    <td colspan="4">相关检索字：
      <input type="file"  name="pic"/></td>
     </tr>
 </table>
 
 <s:submit/><s:reset/>
 </s:form> 
  
 （2）struts.xml
 
   <interceptors>
   <interceptor-stack name="imgFileUpload">
    <interceptor-ref name="fileUpload">
     <param name="allowedTypes">image/jpeg,image/pjpeg,image/gif,image/x-png</param>
     <param name="maximumSize">204800</param>
    </interceptor-ref>
    <interceptor-ref name="defaultStack"/>
   </interceptor-stack>
     </interceptors> 
  
   <action name="saveCompetitionProductReport" class="operationAction" method="saveCompetitionProductReport">
   <interceptor-ref name="imgFileUpload"/>     <!-- ================= 拦截器的使用 ================ -->
   <result name="success">
    /jsp/operation/edit/MyJsp.jsp
   </result>
   <result name="error">/jsp/error.jsp</result>
  </action>  
  
 （3）Action
 /*-------------------------------------------------*/
 private static final int BUFFER_SIZE = 20 * 1024;//文件大小
 private File[] pic;  //对应 <input type="file"  name="pic"/>
 private String[] picFileName; //固定构成格式
 private String[] picContentType; //固定构成格式
 /*-------------------------------------------------*/
 
 //-------- setter / getter
   //.......... code here ............
 
 /**
  * 复制文件
  * @param src
  * @param dest
  */
 private static void copy(File src, File dest){
  try{
   InputStream in = null;
   OutputStream out = null;
   try{
    in = new BufferedInputStream(new FileInputStream(src),BUFFER_SIZE);
    out = new BufferedOutputStream(new FileOutputStream(dest),BUFFER_SIZE);
    byte[] buffer = new byte[1024];
    while(in.read(buffer) > 0){
     out.write(buffer);
    }
   }finally{
    if(null != in){
     in.close();
    }
    if(null != out){
     out.close();
    }
   }
  }catch(Exception e){
   logger.error("复制文件出错",e);
  }
 }

 /**
  * 得到文件的后缀名
  * @param fileName
  * @return
  */
 private static String getExtention(String fileName){
  int pos = fileName.lastIndexOf(".");
  return fileName.substring(pos);
 }
 
 
 
 public String saveCompetitionProductReport(){
  
  List<String> picUrlList = new ArrayList<String>();//图片在服务器上面的相对位置
  if(null != pic){
   for(int i = 0, j = pic.length; i<j; i++){
    String extention = getExtention(picFileName[i]);
    //  "/uploadImage" 是 项目下的文件夹，防止上传的文件 图片被成功上传之后，会存放到tomcat的项目/uploadImage 目录下
    String fileName = ServletActionContext.getServletContext().getRealPath("/uploadImage")+File.separator+new Date().getTime()+ Math.random() + extention;
    
    //System.out.println("before===================" + fileName +"\t" +picFileName[i]);
    File imageFile = new File(fileName);
    copy(pic[i], imageFile);
    
    String tmpFileName = fileName.substring(fileName.indexOf(File.separator +"uploadImage"));
    picUrlList.add(tmpFileName);
   }
   
   Boolean saveMainTableDataFlag = operationBusiness.saveCompetitionProductReport(this);
   if(saveMainTableDataFlag){//当主表保存成功的时候，开始保存明细
     //--------- code here
   }
   
  }
  
  return Action.ACTION_RESULT_SUCCESS;
 }