java copy pdf and add content to pdf file

import java.io.File;
import java.io.FileOutputStream;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.PdfWriter;

public class CreatePDF {
    public static void main(String[] args) throws Exception {
        Document pdfDoc = new Document();
        // The path output stream of the pdf file to be generated
        FileOutputStream pdfFile = new FileOutputStream(new File(
                "F:firstPdf.pdf"));

        // a paragraph
        paragraph in the pdf file = new Paragraph(
                "My first PDF file with an image ...");
        Image image = Image.getInstance("images/pdftest.png");

        // Obtain the PdfWriter output stream object with Document object and File object
        PdfWriter.getInstance(pdfDoc, pdfFile);
        pdfDoc.open(); // Open the Document document

        // Add a text paragraph, a picture
        pdfDoc.add(paragraph);
        pdfDoc.add(image);

        pdfDoc.close();
    }
}

 

 

 

 

 

 

import java.io.File;
import java.io.FileOutputStream;

import com.itextpdf.text.Element;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;

public class CAPdf{
   

    public static void main(String[] args) throws Exception {
          FileUtil.fileChannelCopy(new File("F:\\firstPdf.pdf"),new File("f:\\firstPdf_temp.pdf"));
          PdfReader reader = new PdfReader("f:firstPdf.pdf");
          PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("f:firstPdf_temp.pdf"));
          PdfContentByte overContent = stamper.getOverContent(1);
         
          //添加文字
          BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
          overContent.beginText();
          overContent.setFontAndSize(font, 10);
          overContent.setTextMatrix(200, 200);
          overContent.showTextAligned(Element.ALIGN_CENTER,"需要添加的文字",180,530,0);
          overContent.endText();
         
          //添加图片
          PdfDictionary pdfDictionary = reader.getPageN(1);
          PdfObject pdfObject = pdfDictionary.get(new PdfName("MediaBox"));
          PdfArray pdfArray = (PdfArray) pdfObject;
          Image image = Image.getInstance("images/pdftest.png");
          image.setAbsolutePosition(100,100);
          overContent.addImage(image);
         
          //添加一个红圈
          overContent.setRGBColorStroke(0xFF, 0x00, 0x00);
          overContent.setLineWidth(5f);
          overContent.ellipse(250, 450, 350, 550);
          overContent.stroke();
          stamper.close();
    }
   
   
}