📜  iText-N-up

📅  最后修改于: 2020-10-16 02:59:38             🧑  作者: Mango


以下Java程序演示了如何使用iText库在PDF页面上进行N-up。它创建一个名为nUppingPDF.pdf的PDF文档,并将其保存在路径C:/ itextExamples /

将此代码保存在名为NUppingPDF.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 NUppingPDF {    
   public static void main(String args[]) throws Exception {       
      // Creating a PdfWriter object       
      String dest = "C:/itextExamples/nUppingPDF.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);       
      Rectangle orig = origPage.getPageSize();       
      PdfFormXObject pageCopy = origPage.copyAsFormXObject(destpdf);              
      
      // N-up page       
      PageSize nUpPageSize = PageSize.A4.rotate();       
      PdfPage page = destpdf.addNewPage(nUpPageSize);       
      PdfCanvas canvas = new PdfCanvas(page);              
      
      // Scale page       
      AffineTransform transformationMatrix = AffineTransform.getScaleInstance( 
         nUpPageSize.getWidth() / orig.getWidth() / 
         2f, nUpPageSize.getHeight() / orig.getHeight() / 2f);       
      canvas.concatMatrix(transformationMatrix);              
      
      // Add pages to N-up page       
      canvas.addXObject(pageCopy, 0, orig.getHeight());       
      canvas.addXObject(pageCopy, orig.getWidth(), orig.getHeight());       
      canvas.addXObject(pageCopy, 0, 0);       
      canvas.addXObject(pageCopy, orig.getWidth(), 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处编译并执行保存的Java文件-

javac NUppingPDF.java 
java NUppingPDF 

执行后,上述程序将创建一个显示以下消息的PDF文档。

PDF created successfully..

如果验证指定的路径,则可以找到创建的PDF文档,如下所示。

小睡