如何在PDFBox中添加多个页面 [英] How to add multiple pages in PDFBox

问题描述

我想使用 PDFBox 在我的 PDF 中写入一些内容.一旦页面高度小于边距，我需要创建另一个页面.我想保留光标信息.我有一种方法可以获取光标信息，例如光标所在的位置，这样我就可以从光标位置减去边距并向其添加另一个页面.现在我做了这样的事情

I want to write some content in my PDF using PDFBox. Once the page height is less than the margin I need to create another page. I want to retain the cursor information. I s there a way through which i can get the cursor information like where the cursor is present so i can subtract the margin from cursor position and add another page to it. Right now I have done something like this

PDRectangle rect = page.getMediaBox();
float positionY = rect.getWidth();
 positionY = positionY - pdfWriter.defaultBottomMargin;
if(positionY < positionX) {
               positionY = rect.getWidth();
                PDPage page2 = page;
               rect = page2.getMediaBox();
               document.addPage(page2);
               PDPageContentStream contentStream = new PDPageContentStream(document, page2);
               contentStream.appendRawCommands("T*\n");
               contentStream.beginText();
              // contentStream.setFont(font, 12);
               contentStream.moveTextPositionByAmount(positionX, positionY);
               contentStream.drawString(tmpText[k]);
               contentStream.endText();
               contentStream.close();
               }

推荐答案

您可以使用一些类级别的变量，如下所示，它们通过执行 pdf 生成来保持 positionY.

You can use some class level variables like below which maintains positionY throught execution of pdf generation.

float PAGE_MARGIN = 20;
float newPagepositionY = page.findMediaBox().getHeight() - PAGE_MARGIN;
float positionY = newPagepositionY;
PDPage currentPage = new PDPage();

在PDF上添加任何内容之前，请检查光标是否已到达页面末尾.即创建如下所示的功能

Before adding any content on PDF, check whether cursor has reached at end of page or not. i.e. Create funtion as shown below

public boolean isEndOfPage(Row row) 
{
    float currentY = this.positionY ;
    boolean isEndOfPage = currentY  <= (PAGE_MARGIN + 10);

    return isEndOfPage;
}

使用上述功能，您可以根据需要创建新页面.

Using above funtion, you can create new page as required.

if (isEndOfPage(row)) 
{
    // Reset positionY  to newPagepositionY
    this.positionY  = newPagepositionY;

    this.currentPage = new PDPage();

    // your code
}

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