如何检查 PDF 是否受密码保护
我正在尝试使用 iText 的 PdfReader 检查给定的 PDF 文件是否受密码保护,但出现此异常:
I am trying to use iText's PdfReader to check if a given PDF file is password protected or not, but am getting this exception:
线程主线程"中的异常 java.lang.NoClassDefFoundError:org/bouncycastle/asn1/ASN1OctetString
Exception in thread "Main Thread" java.lang.NoClassDefFoundError:org/bouncycastle/asn1/ASN1OctetString
但是当针对非密码保护的文件测试相同的代码时,它运行良好.完整代码如下:
But when testing the same code against a non-password protected file it runs fine. Here is the complete code:
try {
PdfReader pdf = new PdfReader("C:\abc.pdf");
} catch (IOException e) {
e.printStackTrace();
}
推荐答案
使用 Apache PDFBox - 这里的 Java PDF 库:
示例代码:
Use Apache PDFBox - Java PDF Library from here:
Sample Code:
try
{
document = PDDocument.load( "C:\abc.pdf");
if(document.isEncrypted())
{
//Then the pdf file is encrypeted.
}
}
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