PDFBox对文本加扰

Question

我一直在尝试编辑PDF文档以预填充表单条目。我让它（某种程度上）起作用了。我添加的文本很好。然而，已经存在的其他文本似乎已被替换为“

救命啊！

package pdfboxtest;

import java.awt.Color;
import java.util.List;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.edit.PDPageContentStream;

public class PDFFormFiller {

    private static final String R40_NEW_FORM_PATH = "c:\\temp\\hmrc-r40.pdf";
    private static final String R40_COMPLETED_FORM_PATH = "c:\\temp\\hmrc-r40-complete.pdf";

    public static void main(String[] args) throws Exception {
        PDDocument doc = PDDocument.load(R40_NEW_FORM_PATH);

        addTextToPage(doc);

        doc.save(R40_COMPLETED_FORM_PATH);
        doc.close();
    }

    private static void addTextToPage(PDDocument doc) throws Exception {
        List pages = doc.getDocumentCatalog().getAllPages();
        PDPage firstPage = (PDPage) pages.get(0);
        PDPageContentStream contentStream = new PDPageContentStream(doc, firstPage, true, true);

        contentStream.setFont(PDType1Font.HELVETICA_BOLD, 24);
        contentStream.beginText();
        contentStream.setNonStrokingColor(Color.BLACK);
        contentStream.moveTextPositionByAmount(100, 200);
        contentStream.drawString("HELLO RICHARD!!");
        contentStream.endText();
        contentStream.close();

    }
}

Answer 1

正如在评论中已经假设的那样，这是由于我在本答案中描述的解决方法的PDFBox问题。此问题仍存在于PDFBox 1.8.2版本中，但同时已修复1.8.3和2.0.0版本，参见PDFBOX-1753。

在您的情况下，解决方法会更改addTextToPage方法，如下所示：

private static void addTextToPage(PDDocument doc) throws IOException {
    List pages = doc.getDocumentCatalog().getAllPages();
    PDPage firstPage = (PDPage) pages.get(0);
    PDPageContentStream contentStream = new PDPageContentStream(doc, firstPage, true, true);

    firstPage.getResources().getFonts(); // <<<<<<

    contentStream.setFont(PDType1Font.HELVETICA_BOLD, 24);
    contentStream.beginText();
    contentStream.setNonStrokingColor(Color.BLACK);
    contentStream.moveTextPositionByAmount(100, 200);
    contentStream.drawString("HELLO RICHARD!!");
    contentStream.endText();
    contentStream.close();
}

添加的行强制执行new PDPageContentStream忘记但setFont指望已完成的初始化。您可以在上面引用的答案中找到详细信息。您可能想通知PDFBox开发。