Itext modify pdf.

Recently, the project needs to investigate how to add the logo in pdf to differentiate versions. Finally, it is determined to use itext for implementation.

The Code is as follows:

Java code
/**
* Authory kingviker
* Time: 2012-12-12
*/
Import java. io. FileOutputStream;
Import java. io. IOException; www.2cto.com
 
Import com. itextpdf. text. DocumentException;
Import com. itextpdf. text. Font;
Import com. itextpdf. text. Image;
Import com.itext;.text=. BaseFont;
Import com.itext;.text=. PdfArray;
Import com.itext;.text=. inclucontentbyte;
Import com.itext;.text}. PdfDictionary;
Import com.itext;.text}. CommonName;
Import com.itext;.text=. PdfObject;
Import com.itext;.text=. PdfReader;
Import com.itext;.text=. datagstamper;
 
Public class AddContentToPDF {
 
Public static void main (String [] args) throws IOException, incluentexception {
 
// Create a pdf read stream
PdfReader reader = new PdfReader ("C:/helpader ");
// Create a pdfStamper based on a pdfreader to generate a new pdf file.
PdfStamper stamper = new PdfStamper (reader,
New FileOutputStream ("C:/help2.pdf "));

// This font is self-contained in the itext-asian.jar, so do not consider the operating system environment issues.
BaseFont bf = BaseFont. createFont ("STSong-Light ",
"UniGB-UCS2-H", BaseFont. NOT_EMBEDDED); // set font
// BaseFont does not support font style setting. However, font fonts require the operating system to support this character.
Font font = new Font (bf, 10 );
Font. setStyle (Font. BOLD );
Font. getBaseFont ();
// The page number starts from 1.
For (int I = 1; I <= reader. getNumberOfPages (); I ++ ){
 
// Obtain the content printed on the upper layer of the current page. That is to say, the content will overwrite the original pdf content.
Response contentbyte over = stamper. getOverContent (I );
// Use pdfreader to obtain the dictionary object of the current page. It contains some data of this page, such as the coordinate axis information of this page.
PdfDictionary p = reader. getPageN (I );
// Get the pdf size information of the page in mediaBox.
PdfObject po = p. get (new queue name ("MediaBox "));
System. out. println (po. isArray ());
// Po is an array object that contains the coordinate axis range of the pdf file on this page.
PdfArray pa = (PdfArray) po;
System. out. println (pa. size ());
// Check the maximum value of the Y axis.
System. out. println (pa. getAsNumber (pa. size ()-1 ));
// Start writing text
Over. beginText ();
// Set the font and size
Over. setFontAndSize (font. getBaseFont (), 10 );
// Set the font output position
Over. setTextMatrix (107,540 );
// Text to be output
Over. showText ("I want to add the words [Final Draft]" + I );
Over. endText ();
// Create an image object.
Image image = Image. getInstance ("c:/1.jpg ");
// Set the output position of the image object pa. getAsNumber (pa. size ()-1). floatValue () is the maximum value of the Y axis of the pdf axis on this page.
Image. setAbsolutePosition (0, pa. getAsNumber (pa. size ()-1). floatValue ()-100); // 0, 0,841.92, 595.32
Over. addImage (image );

// Draw a circle.
Over. setRGBColorStroke (0xFF, 0x00, 0x00 );
Over. setLineWidth (5f );
Over. ellipse (250,450,350,550 );
Over. stroke ();
}
 
Stamper. close ();
 
}
}