java - 使用 iText Java 循环创建新的 pdf

Question

我想为循环的每次迭代创建一个新的pdf，因此我用java编写了以下代码:

PdfWriter writer;
PdfDocument pdf;
Document document;

int i=0;
while(condition){
    writer = new PdfWriter("test_"+Integer.toString(i)+".pdf");
    pdf = new PdfDocument(writer);
    document = new Document(pdf);

    //content code here

    document.close()
    i++;
}

我在 document.close() 命令行出现以下异常:

Exception in thread "main" 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:184) at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:174) at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:104) at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:176) at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:104) at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:176) at com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:104) at com.itextpdf.kernel.pdf.PdfWriter.writeToBody(PdfWriter.java:335) at com.itextpdf.kernel.pdf.PdfWriter.flushObject(PdfWriter.java:243) at com.itextpdf.kernel.pdf.PdfDocument.flushObject(PdfDocument.java:1446) at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:155) at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:128) at com.itextpdf.kernel.pdf.PdfObjectWrapper.flush(PdfObjectWrapper.java:96) at com.itextpdf.kernel.pdf.PdfPage.flush(PdfPage.java:489) at com.itextpdf.kernel.pdf.PdfPage.flush(PdfPage.java:448) at com.itextpdf.kernel.pdf.PdfDocument.close(PdfDocument.java:739) at com.itextpdf.layout.Document.close(Document.java:120) at gr.moh.Pdf.main(Pdf.java:224)

我已经尝试了很多，但我找不到为什么会出现错误。如果我不循环地执行它，它就可以工作。有什么帮助吗？

P.S:我使用itext 7

Answer 1

我将下面的代码放在循环之外，它应该进入循环......

PdfFont normalFont = PdfFontFactory.createFont(fontDirectory.getAbsolutePath()+"\\arial.ttf", "Identity-H", true);
                normal.setFont(normalFont).setFontSize(14);

                Style red = new Style();
                PdfFont redFont = PdfFontFactory.createFont(fontDirectory.getAbsolutePath()+"\\arial.ttf", "Identity-H", true);
                red.setFont(redFont).setFontSize(14).setFontColor(Color.RED);

                Style big = new Style();
                PdfFont bigFont = PdfFontFactory.createFont(fontDirectory.getAbsolutePath()+"\\arial.ttf", "Identity-H", true);
                big.setFont(bigFont).setFontSize(18).setBold();