fileupload组件文件上传的疑难问题。。。紧急求助

Question

fileupload组件文件上传的疑难问题紧急求助   
我用fileupload组件做一个上传功能的jsp页面。  
文件可以上传。  
 
现在问题是。如果上传的是txt文件，没有问题  
如果是xls，doc…bmp，jpg…等带有格式的文件，则在上传后的目录不能完整的打开，提示信息丢失，或者文件遭到损害  
如果是图片，颜色会发生变化。。  
 
网上搜了一下，fileupload组件好像别人没有遇到这个问题。  
 
网友用我的代码运行，也正常。  
是我哪个地方没配置好？还是怎么回事？  
form等均已检查过~~  
急阿！！！！！！！！！  
 
大虾帮忙。代码如下：  
*******************************************  
try  
                       {  
                       String  tempFilepath  =  "E:\\mes\\jacMes\\upload\\";  
                       String  savepath="E:\\mes\\jacMes\\upload\\assemble\\";  
                 //如果没有临时目录，则创建它  
                           if(!(new  File(tempFilepath).isDirectory())){  
                                   try{  
                                           new  File(tempFilepath).mkdirs();  
                                   }catch(SecurityException  e){  
                                           System.out.println("can  not  make  security  direcoty");  
                                   }  
                           }  
                             
                           //如果没有上传目的目录，则创建它  
                           if(!(new  File(savepath).isDirectory())){  
                                   try{  
                                           new  File(savepath).mkdirs();  
                                   }catch(SecurityException  e){  
                                           System.out.println("can  not  make  security  direcoty");  
                                   }  
                           }  
 
                   DiskFileUpload  upload  =new  DiskFileUpload  ();  
       
                       upload.setSizeThreshold(4096000);  //最大允许缓存40K的文件  
                       upload.setSizeMax(2621440);  //最大允许上传2.5M的文件  
                       upload.setRepositoryPath(tempFilepath);  
 
               String  s  =DiskFileUpload.FORM_DATA;  
               System.out.println("__________________________"+s);  
                       List  uploadlist=  upload.parseRequest(req);  
                       Iterator  iter=uploadlist.iterator();  
 
                       while(iter.hasNext())  
                       {  
                       FileItem  item=(FileItem)iter.next();  
 
                       if(!item.isFormField())  
                       {  
                       String  filename=item.getName();  
 
                       filename  =  filename.substring(filename.lastIndexOf("\\")+1);//从全路径中提取文件名    
 
//                long  size  =  item.getSize();    
                       if((filename  ==  null)    ¦  ¦  filename.equals("")  &&  size  ==  0)  
                                 continue;  
 
                       savepath=  savepath+filename;  
                       System.out.println("savepath  is  "+savepath);  
                                     
                                 File  saveFilepath  =  new  File(savepath);  
                       item.write(saveFilepath);  
                       }  
                       }  
                       }catch(Exception  ex)  
                       {  
                       ex.printStackTrace();  
                       System.out.println("程序发生错误，抛出异常为  "+ex.getMessage());  
                       }  
                       }  
 
jsp页面代码如下：  
************************************************  
 
 <form    method="post"  id="upform"  name  =  "upform"  action="action.UploadOfAssembleAction.do"  ENCTYPE="multipart/form-data">  
   <table  width="100%"  border="1"  >  
       <tr>  
               <td  width="55%">  
                 <input  type="file"  name="fileone"  size="60"/>  
               </td>  
               <td  width="45%">  
               <input  id="submit"  name  =  "submit"  type="submit"  value="上传"  /><input  type="reset"  value="取消"/>    
   　　　　</td>  
       </tr>  
   </table>  
   </form>