javaMail发附件，附件名的处理问题

郁闷啦，做个邮件客户端不是这报错就是那报错，我在火弧下发送邮件，附件名正常，但当我到了IE下时，附件名就变成了路径名+附件名了，我用转义字符也不行，大侠们有没有什么简单快捷的方法啊？在线等待
贴一下我保存附件的代码：
  public void saveAttachMent(Part part) throws Exception {   
         String fileName = "";   
         if (part.isMimeType("multipart/*")) {   
             Multipart mp = (Multipart) part.getContent();   
             for (int i = 0; i < mp.getCount(); i++) {   
                 BodyPart mpart = mp.getBodyPart(i);   
                 String disposition = mpart.getDisposition();   
                 if ((disposition != null)   
                         && ((disposition.equals(Part.ATTACHMENT)) || (disposition   
                                 .equals(Part.INLINE)))) {   
                     fileName = mpart.getFileName();   
                     if (fileName.toLowerCase().indexOf("utf-8") != -1) {   
                         fileName = MimeUtility.decodeText(fileName);  
                         if(fileName.lastIndexOf("\\")>0){
                          fileName.replace("\\", "_");
                         }
                     }  
                     if (fileName.toLowerCase().indexOf("gb2312") != -1) {   
                         fileName = MimeUtility.decodeText(fileName);
                         if(fileName.lastIndexOf("\\")>0){
                          fileName.replace("\\", "_");
                         }
                     } 
                     System.out.println(fileName);
                     saveFile(fileName, mpart.getInputStream());   
                 } else if (mpart.isMimeType("multipart/*")) {   
                     saveAttachMent(mpart);   
                 } else {   
                     fileName = mpart.getFileName();   
                     if ((fileName != null)&& (fileName.toLowerCase().indexOf("utf-8") != -1)) {   
                         fileName = MimeUtility.decodeText(fileName);   
                         if(fileName.lastIndexOf("\\")>0){
                          fileName.replace("\\", "_");
                         }
                         saveFile(fileName, mpart.getInputStream());   
                     } else if((fileName != null)&& (fileName.toLowerCase().indexOf("gb2312") != -1)) {
                      fileName = MimeUtility.decodeText(fileName);  
                      if(fileName.lastIndexOf("\\")>0){
                          fileName.replace("\\", "_");
                         }
                         saveFile(fileName, mpart.getInputStream());  
                     } 
                 }   
             }   
         } else if (part.isMimeType("message/rfc822")) {   
             saveAttachMent((Part) part.getContent());   
         }   
     }