[英]iText - read PDFs created with an unknown random owner password
I'm getting the following exception when excecuting this code: 在执行此代码时,我收到以下异常:
public byte[] watermarking(byte[] orig) throws IOException {
PdfReader pdfReader = new PdfReader(orig);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PdfStamper pdfStamper = null;
try {
pdfStamper = new PdfStamper(pdfReader, baos); //exc here
...
}
...
} catch (DocumentException var8) {
...
}
}
Exception: 例外:
11:43:11,094 ERROR [de.mlp.xbg.pa.rest.SessionRR] (http-/127.0.0.1:8081-6) PdfReader not opened with owner password: java.lang.IllegalArgumentException: PdfReader not opened with owner password
I checked other threads regarding this topic and it seems that the easiest solution is to add PdfReader.unethicalreading = true;
我检查了关于这个主题的其他线程,似乎最简单的解决方案是添加PdfReader.unethicalreading = true;
However, I'm forced to use iText 2.1.7 or older ( com.lowagie
iText) and not iText 5.0.0 or newer ( com.itextpdf
iText) . 但是,我被迫使用iText 2.1.7或更早版本( com.lowagie
iText)而不是iText 5.0.0或更新版本( com.itextpdf
iText) 。 PdfReader.unethicalreading
does not exist in the old version of the library. 旧版本的库中不存在PdfReader.unethicalreading
。
Here there seems to be a workaround to make iText to ignore password with a disclaimer : 这里似乎有一个解决方法,使iText忽略密码与免责声明 :
I leave legal issues up to you by executing the code below. 我通过执行以下代码将法律问题留给您 。
public static PdfReader unlockPdf(PdfReader reader) {
if (reader == null) {
return reader;
}
try {
java.lang.reflect.Field f = reader.getClass().getDeclaredField("encrypted");
f.setAccessible(true);
f.set(reader, false);
} catch (Exception e) { /* ignore */ }
return reader;
}
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