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The PdfDocument
is the main class in PDFOne Java. It represents a PDF document and allows you to create, read, and enhance PDF documents. It offers numerous methods for you to render PDF elements such as text, images, shapes, forms, watermarks, and annotations on to documents.
Before you start writing new PDF elements, you need to first create a PDF document or load an existing document. To create a new document, you create a PdfDocument
object.
// Create a PdfDocument instance PdfDocument doc = new PdfDocument(); try { // Write some text on page 1 doc.writeText("Hello, World!"); // automatically creates a blank page // Save document to file doc.save("sample_doc1.pdf"); doc.close(); } catch (IOException | PdfException e) { // TODO Auto-generated catch block e.printStackTrace(); }
After you create a new PdfDocument
object, the writeText()
method will allow you write text on a page, which is created by default in the document.
When you begin writing text in this manner, text will be rendered on the top-left corner of the document. Subsequent calls to the method will change this location to where the previous writeText()
method had let off.
To read an existing PDF document, you need to create a PdfDocument
object and then call its "load" method with the file pathname or a memory stream containing the PDF file.
// Create a PdfDocument instance PdfDocument doc = new PdfDocument(); try { // Load an existing document doc.load("sample_doc1.pdf"); // Get page count and display it on console output System.out.println( "Number of pages in sample_doc1.pdf is " + doc.getPageCount()); // Close document doc.close(); } catch (IOException | PdfException e) { // TODO Auto-generated catch block e.printStackTrace(); }
Once you create the PdfDocument
object, you can use the object's methods to read from the loaded document. In the above code snippet, the number of pages in the document is retrieved.
If you need to make changes to an existing document, then you need to call the "save" method of the PdfDocument
instance.
// Create a PdfDocument instance PdfDocument doc = new PdfDocument(); try { // Load input document doc.load("sample_doc1.pdf"); // Write text at position (100, 100) on page 1 doc.writeText( "Hello again, World!", 100, // x-coordinate 50); // y-coordinate // Write changes to output file doc.save("sample_doc2.pdf"); doc.close(); } catch (IOException | PdfException e) { // TODO Auto-generated catch block e.printStackTrace(); }
In the above code snippet, a PDF document is loaded and another "Hello, World" text string is written at a different location (specified by x-y coordinates) on the first page using an overloaded method of PdfDocument.writeText()
. This modified PDF document is then saved to a different file.
You can also render text in different fonts and colors using PdfFont
objects. You can create font objects either by specifying the name of the installed font or the pathname of the font file.
// Create a PdfDocument instance PdfDocument doc = new PdfDocument(); try { // Load an existing PDF document doc.load("sample_doc1.pdf"); // Create font objects PdfFont fontArialItalic = PdfFont.create("Arial", // name of installed font PdfFont.ITALIC | PdfFont.STROKE_AND_FILL, 18, PdfEncodings.WINANSI); PdfFont fontTahomaNormal = PdfFont.create("tahoma.ttf", // pathname of a font file PdfFont.STROKE_AND_FILL, 48, PdfEncodings.WINANSI); // Write text on page 1 using the Arial font doc.writeText("Hello again, World!", fontArialItalic, // font 100, 50); // Change font properties fontTahomaNormal.setStrokeWidth(2); fontTahomaNormal.setStrokeColor(Color.RED); fontTahomaNormal.setColor(Color.ORANGE); // Write more text on page 1 using the Tahoma font doc.writeText("Hello again, World!", fontTahomaNormal, // font 100, 100); // Write modified document to output file doc.save("sample_doc3.pdf"); doc.close(); } catch (IOException | PdfException e) { // TODO Auto-generated catch block e.printStackTrace(); }
In this revised code snippet, text has been rendered using specific fonts. This has been made possible by the use of another overloaded PdfDocument.writeText()
method.
A further improvement has been made on how the text is rendered using a particular font. Colors used to fill and stroke the text have been specified by modifying the properties of the font object (Tahoma).
We have seen the basics of using PDFOne Java. Next month, we will see how to create multiple pages, and render text, shapes, images and watermarks over them.
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