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pdf file measurement

                         

In this program we are going to display the measurement of pdf pages through java program. First ad the value in the paragraphs then add it finally in the document.

In this example we need iText.jar file, without the jar file we never compile our application . The package we need to import is java.io.FileOutputStream, java.io.IOException, com.lowagie.text.Document, com.lowagie.text.DocumentException, com.lowagie.text.Paragraph, com.lowagie.text.Rectangle,com.lowagie.text.pdf.PdfWriter
..

The java.io.FileOutputStream and java.io.IOException classes are used to create file and throw the exception, if there is any exception occurs while creating a file. The com.lowagie.text.Document class is used to create a document object, com.lowagie.text.DocumentException is used to throw exception if there is any exception. com.lowagie.text.Paragraph classes is used to make paragraph , com.lowagie.text.Rectangle classes is used to create object of Rectangle class which will be used for setting the left, right, top, bottom margin, com.lowagie.text.pdf.PdfWriter class is used to write the document on a pdf file,.

To make the program for changing the pdf version firstly we have to make a class MeasurementsPDF. Remember the name of the file should be such that, if any other person see the example then just by seeing the name of the program he can understand what the program is going to do without seeing the code. 

Inside this class declare the main method which must throws Exception. After that follow the simple steps find the version:

  1. Create Rectangle object and set the length and width of the page.
  2. Create Document object and inside the constructor of Document pass pageSize and four integer which set the left,right,top and bottom margin. The Document describes a document's page size, margins, and other important attributes. It works as a container for a document's chapters, sections, images, paragraphs, and other content.
  3. Create object of PrintWiter to add the value to document for. We use getInstance() method, in which we pass two arguments document and FileOutputStream("Measurements.pdf").
  4. Open the document.
  5. Create a Paragraph that hold a paragraph of text, tells the PDF document writer to ensure that the Paragraph's text is justified on both sides and adds the Paragraph to the previously created Document. Inside the constructor of Paragraph we pass a String .Create paragraph and add it into document .
  6. Add the paragraph in the document.
  7. close the document. The closing of the document is important because it flushes and closes the OutputStream instance. 

The code of the program is given below:

import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Paragraph;
import com.lowagie.text.pdf.PdfWriter;
public class MeasureOfWidth {
  public static void main(String[] args)throws Exception {
    System.out.println("Example of measure 
Width of the chunk"
);
    Document document = new Document();
      PdfWriter.getInstance(document,
new FileOutputStream
("Width.pdf"));
      document.open();
      Chunk c = new Chunk("Rose India");
      float w = c.getWidthPoint();
      Paragraph p = new Paragraph("The 
width of the chunk: '"
);
      p.add(c);
      p.add("' is ");
      p.add(String.valueOf(w));
      p.add(" points or ");
      p.add(String.valueOf(w / 72f));
      p.add(" inches.");
      document.add(p);
      document.add(c);
      document.add(Chunk.NEWLINE);
      c.setHorizontalScaling(0.5f);
      document.add(c);
      document.add(c);
    document.close();
  }
}

The output of the program is given below:

 


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