解决异常：Package should contain a content type part [M1.13]

 上午遇到个问题

org.apache.poi.POIXMLException: org.apache.poi.openxml4j.exceptions.InvalidFormatException: Package should contain a content type part [M1.13]

看了下源码public static Workbook create(InputStream in) throws
IOException,InvalidFormatException {
if (!in.markSupported()) {
in = new PushbackInputStream(in, 8);
}
if (POIFSFileSystem.hasPOIFSHeader(in)) {
return new HSSFWorkbook(in);
}
if (POIXMLDocument.hasOOXMLHeader(in)) {
return new XSSFWorkbook(OPCPackage.open(in));
}
throw new IllegalArgumentException("你的excel版本目前poi解析不了");
}
读写xls和xlsx格式时，HSSFWorkbook针对xls，XSSFWorkbook针对xlsx

格式的问题！