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我在电子邮件中收到一个文件，我使用 javamail API 阅读该文件并将其保存到磁盘目录中

邮件提取器.java

    Multipart multiPart = (Multipart) message.getContent(); 
    int numberOfParts = multiPart.getCount(); 
    for (int partCount = 0; partCount < numberOfParts; partCount++) { 
     MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(partCount); 
     if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) { 
       // this part is attachment 
       String fileName = part.getFileName(); 
       attachFiles += fileName + ", "; 
       part.saveFile(saveDir + File.separator + fileName); 
     } 
     else { 
       // this part may be the message content 
       messageContent = part.getContent().toString(); 
     }
    }

现在另一个程序轮询该磁盘目录并读取所有传入文件。我只关心文件扩展名 - xls/xlsx，所以我使用 apache poi 来读取文件：

/AvailabilityDirectoryPoller.java 
FileInputStream fs = new FileInputStream(file); 
 Workbook wb = null; 
 Sheet sheet = null; 
 if(FilenameUtils.getExtension(file.getName()).equalsIgnoreCase("xls")){ 
   wb = new HSSFWorkbook(fs);   //line no 178 
   sheet = (HSSFSheet)wb.getSheetAt(0); 
 } 
 else{ 
   wb = new XSSFWorkbook(fs); 
   sheet = (XSSFSheet)wb.getSheetAt(0); 
 }

这有时（随机读取）会导致如下错误

[2013-07-18 23:38:32,409] ERROR [AvailabilityDirectoryPoller]: Exception in I/O Reading file 
java.io.IOException: Your file contains 79 sectors, but the initial DIFAT array at index 1 referenced block # 98. This isn't allowed and  your file is corrupt 
    at org.apache.poi.poifs.storage.BlockAllocationTableReader.<init>(BlockAllocationTableReader.java:103) 
    at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:151) 
    at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:322) 
    at org.apache.poi.hssf.usermodel.HSSFWorkbook.<init>(HSSFWorkbook.java:303) 
    at com.db.mmrepo.app.avl.bespoke.AvailabilityDirectoryPoller.process(AvailabilityDirectoryPoller.java:178) 
    at com.db.mmrepo.app.avl.bespoke.AvailabilityDirectoryPoller.fileFound(AvailabilityDirectoryPoller.java:73) 
    at org.sadun.util.polling.DefaultListener.receive(DefaultListener.java:43) 
    at com.deltax.util.listener.SignalQueue.run(Unknown Source)

如果我在 MS Excel 中打开保存的文件，它会打开没有警告/错误。

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