使用POIFSFileSystem读取xlsx文件

Question

public static void unprotectXLSXSheet(String fileName, String password) {
        try{

            POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(fileName));
            EncryptionInfo info = new EncryptionInfo(fs);
            Decryptor d = Decryptor.getInstance(info);
            d.verifyPassword(password);
            InputStream is = d.getDataStream(fs);
            System.out.println(is.available());
            XSSFWorkbook wb = new XSSFWorkbook(OPCPackage.open(is));
            FileOutputStream fileOut;
            fileOut = new FileOutputStream(fileName);
            wb.write(fileOut);
             fileOut.flush();
            fileOut.close();
            }catch(FileNotFoundException ex){
                ex.printStackTrace();
            }catch(IOException ex){
                ex.printStackTrace();

Exception in thread "main" 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)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:131)
    at org.apache.poi.poifs.storage.HeaderBlock.<init>(HeaderBlock.java:104)
    at org.apache.poi.poifs.filesystem.POIFSFileSystem.<init>(POIFSFileSystem.java:138)
    at com.wolseley.Excel.TestMainDummy.unprotectXLSXSheet(TestMainDummy.java:113)
    at com.wolseley.Excel.TestMainDummy.main(TestMainDummy.java:52)

我需要帮助在阅读xlsx文件，也使用密码解锁，正如上面所做的。

Answer 1

下面的代码行基本上不适用于Office2007+XML文档：

POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(fileName));

因此首先需要检查输入流中的头是否通过调用以下命令得到支持：

POIFSFileSystem.hasPOIFSHeader(is)

并且只有在上面返回true时才解密。HaspoifSheader方法需要一个支持Mark/Reset的输入流，因此也要检查该输入流，如果不支持，则将其包装在PushBackInputStream中。

public static void unprotectXLSXSheet(String fileName, String password) throws Exception {
    InputStream is = null;
    FileOutputStream fileOut = null;

    try {
        is = new FileInputStream(fileName);
        if (!is.markSupported()) {
            is = new PushbackInputStream(is, 8);
        }

        if (POIFSFileSystem.hasPOIFSHeader(is)) {
            POIFSFileSystem fs = new POIFSFileSystem(is);
            EncryptionInfo info = new EncryptionInfo(fs);
            Decryptor d = Decryptor.getInstance(info);
            d.verifyPassword(password);
            is = d.getDataStream(fs);
        }

        System.out.println(is.available());
        XSSFWorkbook wb = new XSSFWorkbook(OPCPackage.open(is));
        fileOut = new FileOutputStream(fileName);
        wb.write(fileOut);
        fileOut.flush();
    } finally {
        if (is != null) {
            is.close();
        }
        if (fileOut != null) {
            fileOut.close();
        }
    }
}