Itext Pdf Example

1. Itext Pdf Example Free
2. Jfreechart Itext Pdf Example
3. Itext Template Pdf Example

In this iText tutorial, I am writing various code examples read a pdf file and generate PDF file. IText library helps to generate pdf files from java applications dynamically. These code examples are categorized into multiple sections based on the work they do OR functionality they achieve. ITextSharp is open source PDF solution. In most of the examples below, I tried to alter,copy a template PDF and then save it into a brand new output PDF file. It's easy to work with PDFs, when we have a basic template (created externally using Adobe/OpenOffice) in place, - instead of generating a new. IText 7 represents the next level of SDKs for developers that want to take advantage of the benefits PDF can bring. Equipped with a better document engine, high and low-level programming capabilities and the ability to create, edit and enhance PDF documents, iText 7 can be a boon to nearly every workflow.

2 Nov 2011CPOL

Creating PDF documents with iTextSharp using a combination of images and text.

Introduction

This article is about using iText to generate PDF files using a combination of images and dynamic text written on select locations on the image. https://obmusiocae.tistory.com/7. The example project uses an ASP.NET MVC3 application to demonstrate the code but it should not be difficult to adapt it to your own needs.

Background

Me and some friends have been running a hobby web-site called malleus.dk dedicated to two role-playing games called Warhammer Fantasy and Dark Heresy.

One of the applications on our site is a 'character generator' where users can build, configure, and maintain their role-playing characters. We wanted to expand this tool with a print functionality allowing our users to have their characters printed to a nice looking character sheet.

We decided that we really needed to generate a PDF document. PDF documents are supported in all browsers and seems to be the de-facto standard for documents on the web. There are a lot of PDF components available on the net, but we quickly settled on iText as it is a very mature product.

iText comes with a free option under the GNU Affero Public License, or with a commercial option which gives you more freedom. I encourage you to check out the details at http://itextpdf.com.

Using the example solution

The example solution contains two projects - a Class Library and an ASP.NET MVC application. iText is used from the Class Library, and the web application is used for testing the Class Library.

The example creates a 'diploma' for a bicycle race. You can enter name, date, the name of the race, and the distance. The web application will produce a diploma with the entered text on top.

The basic flow of the example application is illustrated with images in figure 1, 2, and 3:

Figure 2 - Entering data in example app

Clicking 'Generate' will create a new PDF document:

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From here on, it is only a matter of adding more artwork, tweaking texts, fonts, etc.

Even though the diploma application is very basic, it contains all the programmatic elements required for producing output that looks like figure 4. The artistic skill that goes into images and layout is a job for a designer.

Figure 4 - Character sheet in PDF generated using iText

Installing and setting up

Go to http://itextpdf.com/download.php and click 'Download iTextSharp'. In your Visual Studio project, you need to reference the itextsharp.dll that you just downloaded.

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Document generation strategy

When you open up iText and begin examining the API, you will notice that it is capable of writing text, drawing figures, inserting images, creating PDF forms, etc. For our task, we decided to use a combination of image fragments and text. The bottom layer will contain all the image fragments and the top layer will contain the text.

Creating a PDF document

When you create PDF documents in iText, the top-level abstraction is the Document class. It provides various document level information such as title, page count, etc.:

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The output stream is just a MemoryStream which is returned as a FileContentResult:

When this controller action is invoked, it will send the contents of the MemoryStream back to the client as a PDF file called 'diploma.pdf'.

To actually fill the document with content, you need to learn to use the PdfWriter, PdfReader, and PdfTemplate classes.

Bottom layer

The bottom layer of the page is filled with other PDF fragments and images. Figure 2 contains our background image. To load these elements into the document, you do the following:

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1. Load the PDF fragment using a PdfReader.
2. Use the reader to create a PdfTemplate instance.
3. Add the PdfTemplate to your current Document instance.

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Resource.GetBicycle() simply returns a Stream instance to a resource embedded within the assembly. The call to document.NewPage() generates a new page in the Document instance and the writer.DirectContentUnder property returns a PdfContentByte instance for the bottom layer of this new page. The pcb.AddTemplate() invocation adds the loaded PDF fragment to the document and positions it on the bottom left corner - coordinates x = 0 and y = 0.

At first it seems odd that you have to use the PdfWriter instance to transform the contents of the PdfReader into a PdfTemplate. As Bruno Lowagie - the creator of iText - explained to me, this is done to ensure that shared objects are reused. For instance, if you embed your own fonts in the document, the best option is to reuse this font whenever you write some text.

For more specific details, I encourage you to get a hold of the book 'iText in Action - 2^nd edition'.

Top layer

The top layer is where I put the text. As with everything else in iText, you have several options. You can add entire paragraph objects or print text at specific points. Since I need to print on top of an image/PDF fragment, I went with the last option.

The numbers in this code fragment represent a position in a coordinate system.

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Setting the font and size:

Invoking this method will set the font to Helvetica with size 36. This will affect the invocations to the following method:

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The _name, _distance etc. fields are injected into the DiplomaPrinter class via the constructor.

Closing the document

To end the document, you should flush your writer and call Close on the document:

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This has the effect of pushing the PDF document down to the output stream that you used to create the document with in the first place.

Tricks

When generating documents this way, you often need to adjust the position of text and images. To help with this, I created two methods for adding a ruler to the generated PDF document. If you check the 'add rulers' box in the example application, you should see something like the following:

Having these rulers makes it much easier to find the positions of text and images.

You can also play around with the code-page being used by iText when generating text. This is done by changing the value of the encoding parameter of the BaseFont.CreateFont() method. The example uses the value 'Cp1252' which is for Western Europe. Reading the source code for iText, I can see that it also supports the values 'Cp1250' (Central- and Eastern Europe) and 'Cp1257' (the three Baltic states) but I have yet to play around with these.

Conclusion

iText is a mature piece of software with tons of possibilities. I have only scratched the surface of what is possible. A quick scan of the API reveals that you can do PDF forms, drawing, encryption, etc. I once tried to read the PDF specification and found that it is one complex beast. I very much prefer delegating the work to an API such as iText.

History

• 1 November 2011 - First edition.

• iText Tutorial

• iText Introduction

• iText Tables

• iText Images

• iText Annotations

Jfreechart Itext Pdf Example

• iText Canvas

• iText Miscellaneous

• iText Useful Resources

• Selected Reading

Let us now understand how to create a PDF document using the iText library.

Creating an Empty PDF Document

You can create an empty PDF Document by instantiating the Document class. While instantiating this class, you need to pass a PdfDocument object as a parameter to its constructor.

Following are the steps to create an empty PDF document.

Step 1: Creating a PdfWriter object

The PdfWriter class represents the Doc Writer for a PDF. This class belongs to the package com.itextpdf.kernel.pdf. The constructor of this class accepts a string, representing the path of the file where the PDF is to be created.

Instantiate the PdfWriter class by passing a string value (representing the path where you need to create a PDF) to its constructor, as shown below.

When an object of this type is passed to a PdfDocument (class), every element added to this document will be written to the file specified.

Step 2: Creating a PdfDocument object

The PdfDocument class is the class that represents the PDF Document in iText. This class belongs to the package com.itextpdf.kernel.pdf. To instantiate this class (in writing mode), you need to pass an object of the class PdfWriter to its constructor.

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Instantiate the PdfDocument class by passing the above created PdfWriter object to its constructor, as shown below.

Once a PdfDocument object is created, you can add various elements like page, font, file attachment, and event handler using the respective methods provided by its class.

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Step 3: Adding an empty page

The addNewPage() method of the PdfDocument class is used to create an empty page in the PDF document.

Add an empty page to the PDF document created in the previous step as shown below.

Step 4: Creating a Document object

The Document class of the package com.itextpdf.layout is the root element while creating a self-sufficient PDF. One of the constructors of this class accepts an object of the class PdfDocument.

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Instantiate the Document class by passing the object of the class PdfDocument created in the previous steps as shown below.

Step 5: Closing the Document

Close the document using the close() method of the Document class as shown below.

Example

Following is the Java program which demonstrates the creation of a PDF Document. It creates a PDF document with the name sample.pdf, adds an empty page to it, and saves it in the path C:/itextExamples/

Save this code in a file with the name create_PDF.java.

Compile and execute the saved Java file from the Command prompt using the following commands −

Upon execution, the above program creates a PDF document, displaying the following message.

If you verify the specified path, you can find the created PDF document as shown below.

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Since this is an empty document, if you try to open this document, it will display an error message, as shown in the following screenshot.