iText - 平铺 PDF 页面
以下 Java 程序演示了如何使用 iText 库将 PDF 页面的内容平铺到不同的页面。它创建一个名为 tilingPdfPages.pdf 的 PDF 文档,并将其保存在路径 C:/itextExamples/ 中。
将此代码保存在名为 TilingPDFPages.java 的文件中。
import com.itextpdf.kernel.geom.AffineTransform; import com.itextpdf.kernel.geom.PageSize; import com.itextpdf.kernel.geom.Rectangle; import com.itextpdf.kernel.pdf.PdfDocument; import com.itextpdf.kernel.pdf.PdfPage; import com.itextpdf.kernel.pdf.PdfReader; import com.itextpdf.kernel.pdf.PdfWriter; import com.itextpdf.kernel.pdf.canvas.PdfCanvas; import com.itextpdf.kernel.pdf.xobject.PdfFormXObject; public class TilingPDFPages { public static void main(String args[]) throws Exception { // Creating a PdfWriter object String dest = "C:/itextExamples/tilingPdfPages.pdf"; PdfWriter writer = new PdfWriter(dest); // Creating a PdfReader String src = "C:/itextExamples/pdfWithImage.pdf"; PdfReader reader = new PdfReader(src); // Creating a PdfDocument objects PdfDocument destpdf = new PdfDocument(writer); PdfDocument srcPdf = new PdfDocument(reader); // Opening a page from the existing PDF PdfPage origPage = srcPdf.getPage(1); // Getting the page size Rectangle orig = origPage.getPageSizeWithRotation(); // Getting the size of the page PdfFormXObject pageCopy = origPage.copyAsFormXObject(destpdf); // Tile size Rectangle tileSize = PageSize.A4.rotate(); AffineTransform transformationMatrix = AffineTransform.getScaleInstance(tileSize.getWidth() / orig.getWidth() * 2f, tileSize.getHeight() / orig.getHeight() * 2f); // The first tile PdfPage page = destpdf.addNewPage(PageSize.A4.rotate()); PdfCanvas canvas = new PdfCanvas(page); canvas.concatMatrix(transformationMatrix); canvas.addXObject(pageCopy, 0, -orig.getHeight() / 2f); // The second tile page = destpdf.addNewPage(PageSize.A4.rotate()); canvas = new PdfCanvas(page); canvas.concatMatrix(transformationMatrix); canvas.addXObject(pageCopy, -orig.getWidth() / 2f, -orig.getHeight() / 2f); // The third tile page = destpdf.addNewPage(PageSize.A4.rotate()); canvas = new PdfCanvas(page); canvas.concatMatrix(transformationMatrix); canvas.addXObject(pageCopy, 0, 0); // The fourth tile page = destpdf.addNewPage(PageSize.A4.rotate()); canvas = new PdfCanvas(page); canvas.concatMatrix(transformationMatrix); canvas.addXObject(pageCopy, -orig.getWidth() / 2f, 0); // closing the documents destpdf.close(); srcPdf.close(); System.out.println("PDF created successfully.."); } }
使用以下命令从命令提示符编译并执行保存的 Java 文件 −
javac TilingPDFPages.java java TilingPDFPages
执行后,上述程序将创建一个 PDF 文档,并显示以下消息。
PDF 创建成功。.
如果验证指定的路径,则可以找到创建的 PDF 文档,如下所示 −