PDFBox 以内联方式插入与 TEXT 内联的图像

Question

我第一次使用PDFBox来生成PDF。我有一个文本文档，其中包含由我的java程序生成的一系列约40个多选题。有些问题与小图像相关联，需要在问题上方插入。出于这个原因，我正在将文本文档转换为PDF，并希望在其上插入图像。

我成功地在PDF文档中插入了一张图片，但是它像背景一样嵌入了文本。我希望将图像与文本对齐(如word格式的文本框，内嵌)。看起来插入图像类需要一个绝对位置，这取决于文本的位置。

我怎么知道在哪里画我的图像？

对于信息PDFBox2.0.7.jar

import ExamDatabase.ReadInputFile;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.font.PDFontFactory;//???look up
import org.apache.pdfbox.pdmodel.font.PDTrueTypeFont;
import org.apache.pdfbox.pdmodel.font.PDType3Font;
import org.apache.pdfbox.pdmodel.font.PDSimpleFont;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
import org.apache.pdfbox.pdmodel.graphics.image.PDInlineImage;

/**
 *
 * @author Steve carr
 */
public class HelloWorldPdf1_1_1
{
    //runs

    /**
     * @param args the command line arguments
     * @throws java.io.IOException
     */
    public static void main(String[] args) throws IOException
    {

        ReadInputFile fileI = new ReadInputFile();// read plain text file text file
        ArrayList<String> localList = fileI.readerNew();

        // Create a document and add a page to it
        try (PDDocument document = new PDDocument())
        {
            PDPage page = new PDPage();
            document.addPage(page);

            // Create a new font1 object selecting one of the PDF base fonts
            PDFont font1 = PDType1Font.HELVETICA;//TIMES_ROMAN;
            PDFont font2 = PDType1Font.TIMES_ROMAN;
            PDFont font3 = PDType1Font.COURIER_BOLD;

            try (PDPageContentStream contentStream = new PDPageContentStream(document, page))
            {

                //Creating PDImageXObject object
                PDImageXObject pdImage = PDImageXObject.createFromFile("C:/PdfBox_Examples/CARD00.GIF", document);

                //**creating the PDPageContentStream object
                //PDPageContentStream contents = new PDPageContentStream(document, page);
                //**Drawing the image in the PDF document           
                contentStream.drawImage(pdImage, 100, 500, 50, 70);//1ST number is horizontal posn from left

                //****TEXTTEXTTEXTTEXT
                // Define a text content stream using the selected font1, moving the cursor and drawing the text "Hello World"
                contentStream.beginText();

                contentStream.setFont(font1, 11);

                contentStream.newLineAtOffset(0, 0);
                contentStream.setCharacterSpacing(0);
                contentStream.setWordSpacing(0);
                contentStream.setLeading(0);
                contentStream.setLeading(14.5f);// this was key for some reason

                contentStream.moveTextPositionByAmount(100, 700);// sets the start point of text

                System.out.println("localList.size= " + localList.size());//just checking within bounds during testing

                String line;
                int i;

                for (i = 0; i < 138; ++i)
                {
                    System.out.println(localList.get(i));
                    line = localList.get(i);

                    contentStream.drawString(line);
                    contentStream.newLine();
                }

                contentStream.endText();
                //******************************************************
                // Make sure that the content stream is closed:
                contentStream.close();
            }

            // Save the results and ensure that the document is properly closed:
            document.save("Hello World.pdf");
        }
    }
}

在图像顶部写入文本的结果输出：

Answer 1

根据这个pdf框修复:https://issues.apache.org/jira/browse/PDFBOX-738,透明度只有在rgba设置时才保留。所以如果透明度被保留，它将看起来与其他文本内联，而不是覆盖，所以这可能是你的问题的第一部分，即覆盖问题的解决方案。

该示例帮助您找到如何计算特定文本占用的宽度，从而计算文本后面的图像位置：https://svn.apache.org/viewvc/pdfbox/trunk/examples/src/main/java/org/apache/pdfbox/examples/interactive/form/DetermineTextFitsField.java?revision=1749360