一言不合先抛个异常

org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)

HSSFWorkbook workbook = new HSSFWorkbook(in);

这段异常表示excel版本和workbook的类型不匹配导致的, HSSFWorkbook不支持Excel2007之后的文件版本, poi提供了XSSFWorkbook类型支持后面的版本,

XSSFWorkbook workbook = new XSSFWorkbook(in);

但是这段代码对老版本的excel不兼容, 查看文档和源码发现HSSFWorkbook和XSSFWorkbook都实现了Workbook接口, 按照网上推荐的方法, 把代码修改成了

Workbook workbook = null;

try{

workbook = new HSSFWorkbook(in);

}catch(Exception e){

workbook = new XSSFWorkbook(in);

}

然后. 成功的抛出了另一个异常

java.io.IOException: Stream closed

这.... 节奏不对啊, 进入try块之后顺手把流关了, 这个方法也搞不定, 难道不用流来做参数?? 还是先判断一下流的类型????

怎么判断???? 我是不会, 好吧, 看文档, 我相信apache肯定能解决这个问题

好了, 代码改成了

Workbook workbook = WorkbookFactory.create(in);

一切都正常了. 那么这个方法一定是判断了文件类型的, 废话不多说, 贴源码

public static Workbook create(InputStream inp, String password) throws IOException, InvalidFormatException, EncryptedDocumentException {

// If clearly doesn't do mark/reset, wrap up

if (! inp.markSupported()) {

inp = new PushbackInputStream(inp, 8);

}

// Ensure that there is at least some data there

byte[] header8 = IOUtils.peekFirst8Bytes(inp);

// Try to create

if (NPOIFSFileSystem.hasPOIFSHeader(header8)) {

NPOIFSFileSystem fs = new NPOIFSFileSystem(inp);

return create(fs, password);

}

if (DocumentFactoryHelper.hasOOXMLHeader(inp)) {

return new XSSFWorkbook(OPCPackage.open(inp));

}

throw new InvalidFormatException("Your InputStream was neither an OLE2 stream, nor an OOXML stream");

}

当然, maven的依赖要改成这个了

org.apache.poi

poi-ooxml

3.15