Question

我想用itext 7生成一个pdf，但是我们遇到了一些错误：

com.itextpdf.kernel.PdfException: Pdf indirect object belongs to other PDF document. Copy object to current pdf document.
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:195) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:185) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:115) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:187) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:115) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:187) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:115) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfWriter.writeToBody(PdfWriter.java:383) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfWriter.flushObject(PdfWriter.java:289) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfDocument.flushObject(PdfDocument.java:1572) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:159) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:127) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfObjectWrapper.flush(PdfObjectWrapper.java:94) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfPage.flush(PdfPage.java:495) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfPage.flush(PdfPage.java:454) ~[kernel-7.0.2.jar:na]
at com.itextpdf.kernel.pdf.PdfDocument.close(PdfDocument.java:785) ~[kernel-7.0.2.jar:na]
at com.itextpdf.layout.Document.close(Document.java:120) ~[layout-7.0.2.jar:na]
at com.xcz.afbp.thirdparty.service.impl.GeneratePDFService.generatePDF(GeneratePDFService.java:160) ~[classes/:na]

我的生成代码：

public void generatePDF(CreditQueryData creditQueryData, Map<String, UserCreditContentView> contentViewMap, List<PackageCreditContentView> needRetrievedCreditContentList, File pdfFile, BigDecimal score) throws Exception {

    if (!pdfFile.exists()) {
        boolean x = pdfFile.createNewFile();
        if (!x) {
            LOG.error("生成文件出错" + pdfFile.getPath());
            return;
        }
    }

    PdfDocument pdf = new PdfDocument(new PdfWriter(new FileOutputStream(pdfFile)));
    Document document = new Document(pdf, PageSize.A4);
    document.setRenderer(new DocumentRenderer(document));

    pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new WatermarkingEventHandler());

    try {
        //operate code just add tableA tableB tableC...

    } catch (Exception e) {
        LOG.info();
    } finally {
        document.close(); //exception throws here
    }


}

我在itext7中唯一的样式代码：

 private PdfFont bfChinese = null;

将调用服务构造函数中的init：

 public GeneratePDFService() {
    String PdfFontPath = EnvironmentUtils.getClasspathFilePath("font/MSYH.TTF");
    try {
        bfChinese =  PdfFontFactory.createFont(PdfFontPath, "Identity-H", true);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

我已经尝试将我的字体设置为 static ，但不起作用。

这是抛出异常的地方：

private void write(PdfIndirectReference indirectReference) {
        if (document != null && !indirectReference.getDocument().equals(document)) {
            throw new PdfException(PdfException.PdfIndirectObjectBelongsToOtherPdfDocument);
        }
        if (indirectReference.getRefersTo() == null) {
            write(PdfNull.PDF_NULL);
        } else if (indirectReference.getGenNumber() == 0) {
            writeInteger(indirectReference.getObjNumber()).
                    writeBytes(endIndirectWithZeroGenNr);
        } else {
            writeInteger(indirectReference.getObjNumber()).
                    writeSpace().
                    writeInteger(indirectReference.getGenNumber()).
                    writeBytes(endIndirect);
        }
    }

这意味着我有两个不同的文档，但我不知道我什么时候创建了另一个文档。提前感谢您的建议。

Answer 1

I have experienced the same problem myself (and it took me hours to discover what I was doing wrong). As it turns out, you can use a specific PdfFont instance for only one document. As soon as you use a PdfFont instance it is linked to that document, and you can no longer use it in another document.

For instance:

class ThisGoesWrong {

    protected PdfFont font;

    public ThisGoesWrong() {
        font = PdfFontFactory.createFont(...);
    }

    public void createPdf() {
        ...
        Paragraph p = new Paragraph("test").setFont(font);
        document.add(p);
        ...
    }
}

The class ThisGoesWrong creates a correct PDF the first time you call createPdf(), but it shows the exception you have when you call it a second time.

I discovered that this solves the problem:

class ThisWorksOK {

    public ThisWorksOK() {
    }

    public void createPdf() {
        ...
        PdfFont font = PdfFontFactory.createFont(...);
        Paragraph p = new Paragraph("test").setFont(font);
        document.add(p);
        ...
    }
}

I don't know if this is a bug (it certainly feels like a bug), so I will create an internal ticket at iText Group.

Answer 2

要提高性能，您应该重复使用FontProgram：

private FontProgram bfChinese = null;

public GeneratePDFService() {
    String PdfFontPath = EnvironmentUtils.getClasspathFilePath("font/MSYH.TTF");
    try {
        bfChinese =  FontProgramFactory.createFont(PdfFontPath);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

然后：

public void createPdf() {
    ...
    PdfFont font = PdfFontFactory.createFont(bfChinese, "Identity-H", true);
    Paragraph p = new Paragraph("test").setFont(font);
    document.add(p);
    ...
}

Answer 3

这就是我解决问题的方式。

创建了DocumentUtil类
添加静态方法
```
DoCmd
```

使用如下字体：

public class DocumentUtils {    
    public static PdfFont setFont() throws Exception {
            return PdfFontFactory.createFont(StandardFonts.TIMES_ROMAN);
    }
}

Itext7生成带有异常的pdf“Pdf间接对象属于其他PDF文档。将对象复制到当前的pdf文档。”

3 个答案: