.doc / .xls文档都可以以OLE2存储格式存储. org.apache.poi.poifs.filesystem.FileMagic可以帮助您仅检测文件存储格式,而不仅仅是为了区分.doc / .xls文件.

此外,似乎POI库中没有任何可用的直接API来确定给定输入流/文件的文档类型(excel或文档).

下面的示例我将有助于确定给定的流是否是一个有效的.xls(或.xlsx)文件,但需要注意它读取给定的inputstram并关闭它.

// slurp content from given input and close it

public static boolean isExcelFile(InputStream in) throws IOException {

try {

// it slurp the input stream

Workbook workbook = org.apache.poi.ss.usermodel.WorkbookFactory.create(in);

workbook.close();

return true;

} catch (java.lang.IllegalArgumentException | org.apache.poi.openxml4j.exceptions.InvalidFormatException e) {

return false;

}

}

您可以在this link上找到有关Excel文件格式的更多信息

public class TikaBasedFileTypeDetector {

private Tika tika;

private TemporaryResources temporaryResources;

public void init() {

this.tika = new Tika();

this.temporaryResources = new TemporaryResources();

}

// clean up all the temporary resources

public void destroy() throws IOException {

temporaryResources.close();

}

// return content mime type

public String detectType(InputStream in) throws IOException {

TikaInputStream tikaInputStream = TikaInputStream.get(in, temporaryResources);

return tika.detect(tikaInputStream);

}

public boolean isExcelFile(InputStream in) throws IOException{

// see https://stackoverflow.com/a/4212908/1700467 for information on mimetypes

String type = detectType(in);

return type.startsWith("application/vnd.ms-excel") || //for Micorsoft document

type.startsWith("application/vnd.openxmlformats-officedocument.spreadsheetml"); // for OpenOffice xml format

}

}

有关mime类型,请参阅this answer.