Question

我试图为现有的pdf文件提供密码。它适用于使用.jrxml或.jasper保存的jasper报告，但如何为pdf文件提供。

示例代码：

public static void main(String[] args) {
    String USER="Sai123";
    String OWNER="Sairam";

    try {
        InputStream input=new FileInputStream(new File("D:\\Project1\\EmailSendExample\\WebContent\\PDFiles\\AnnexI.pdf")); 
        OutputStream file = new FileOutputStream(new File("D:\\Test.pdf"));
        /*PdfReader reader = new PdfReader(input);
        PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("D:\\Test.pdf"));
        stamper.setEncryption(PdfWriter.ALLOW_PRINTING, OWNER,USER, PdfWriter.ENCRYPTION_AES_128 | PdfWriter.DO_NOT_ENCRYPT_METADATA);
            stamper.close();
            reader.close();*/

        JRPdfExporter exporter = new JRPdfExporter();

        //exporter.setParameter(JRExporterParameter.INPUT_FILE, new File("D:\\Project1\\EmailSendExample\\WebContent\\PDFiles\\AnnexI.pdf"));
        exporter.setParameter(JRExporterParameter.OUTPUT_FILE,new File("D:\\Test.pdf"));
        exporter.setParameter(JRPdfExporterParameter.OWNER_PASSWORD, "Sai123");
        exporter.setParameter(JRPdfExporterParameter.USER_PASSWORD, "Sairam");
        exporter.setParameter(JRPdfExporterParameter.IS_ENCRYPTED, Boolean.TRUE);
        exporter.exportReport();
        System.out.println("Report Generation Complete");

        file.close();

    } catch (Exception e) {

        e.printStackTrace();
    }

它会像

那样抛出错误

net.sf.jasperreports.engine.JRException: No input source supplied to the exporter.
at net.sf.jasperreports.engine.JRAbstractExporter.setInput(JRAbstractExporter.java:922)
at net.sf.jasperreports.engine.export.JRPdfExporter.exportReport(JRPdfExporter.java:296)
at pdfpassword.main(pdfpassword.java:45)

提前感谢您的宝贵建议。

Answer 1

According to me,we cannot provide pdf file as input to JRexporter.  so in order to make existing pdf password protected use the code below.It works for me.

代码：

private static String USER_PASSWORD = "password";
private static String OWNER_PASSWORD = "naveen";
public static void main(String[] args) throws IOException {
try
{
PdfReader pdfReader = new PdfReader("/home/base/Desktop/newtask/ext.pdf");
PdfStamper pdfStamper = new PdfStamper(pdfReader,new FileOutputStream("/home/base/Desktop/newtask/ext1.pdf"));
pdfStamper.setEncryption(USER_PASSWORD.getBytes(),OWNER_PASSWORD.getBytes(), PdfWriter.ALLOW_PRINTING,PdfWriter.ENCRYPTION_AES_128);
pdfStamper.close();
      } catch (FileNotFoundException e)
      {
         e.printStackTrace();
      } catch (com.itextpdf.text.DocumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Answer 2

我看到这一行评论了 -

//exporter.setParameter(JRExporterParameter.INPUT_FILE, new File("D:\\Project1\\EmailSendExample\\WebContent\\PDFiles\\AnnexI.pdf"));

关于输入的例外讨论 -

net.sf.jasperreports.engine.JRException: No input source supplied to the exporter.

为现有的pdf文件提供密码保护

2 个答案: