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Using Java to generate PDF file

xiang-lee/pdf-generator

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README.md

Using Java to generate PDF file

It’s flexible to create your HTML+CSS in freemarkter tempalte to generate the PDF.

It supports for Bookmarks in navigation bar. In the example, users data is from User.java object

If you are using eclipse, you can import «Existing Maven Project», set the PDF output path in Runner.java and run it. Enjoy!

//The output path of your PDF file String outputFilePath = "C:\\PDFSample\\samplePDF.pdf"; //The path of your freemarker template String tampleFile = "freemarker_template.html"; //you can put any variables you want, so that you can use them in freemarker template Map variables = new HashMap(); variables.put("users",users); String htmlStr = HtmlGenerator.generate(tampleFile, variables); PdfGenerator.generate(htmlStr, new FileOutputStream(outputFilePath)); 

You can easily display the data like HTML + CSS, the users variable is from variables.put(«users»,users) in the example

Источник

Creating a PDF in Java: A Step-by-Step Guide

As a programmer, you may need to create PDF files in Java applications at some stage. For example, to generate receipts, invoices, business reports, etc. Various Java PDF libraries are available that let you generate PDF files from scratch. However, this article is going to provide you with a powerful, high-speed, and high-quality Java library to create PDF files, which requires you to write minimum lines of code.

So let’s see how to create PDF files from scratch in Java. Also, let’s have a look at how to insert text, images, tables, and other elements in a PDF document programmatically.

Java PDF Library#

To create and manipulate PDF files, we will use Aspose.PDF for Java. It is a PDF file manipulation library to create rich PDF files without writing complex code. Using the library, you can create simple as well as complex PDF documents. Also, you can get a free license and generate the desired PDF files.

Aspose.PDF for Java can either be downloaded as JAR or installed within Maven-based applications.

 AsposeJavaAPI Aspose Java API https://repository.aspose.com/repo/  

 com.aspose aspose-pdf 22.11 jdk17  

How to Create a PDF in Java#

The following are the steps to create a simple PDF file from scratch and insert a piece of text in it.

• Create an instance of Document class.
• Add a new page using Document.getPages().add() method and get its reference in Page object.
• Add text to the page using Page.getParagraphs().add(new TextFragment(“Hello World!”)) method.
• Save the PDF file using Document.save(String) method.

The following code sample shows how to create a PDF file in Java.

Java PDF Generation with Text Formatting#

Let’s now check out how to apply formatting to the text in the PDF document. The text formatting could include font, font size, color, position, etc. The following are the steps to perform this operation.

• Use Document class to create a new PDF document or load an existing one.
• Access the Page you want to place the text on.
• Create an object of TextFragment to set the text and other formatting options such as position, font, color, size, etc.
• Use the TextBuilder class to add the TextFragment object to the page.
• Use the Document.save(String) method to save the PDF document.

The following code sample shows how to generate a PDF file and apply text formatting using Java.

Generate PDF Files with Image in Java#

The following are the steps to insert an image in a PDF file using Aspose.PDF for Java.

• Create a Document object to create or open the PDF document.
• Get the page you want to add an image to in the Page object.
• Add the image into the Page.getResources() collection.
• Use operators to place the image on the page:
  • GSave operator to save the current graphical state.
  • ConcatenateMatrix operator to specify where the image is to be placed.
  • Do operator to draw the image on the page.
  • Finally, use the GRestore operator to save the updated graphical state.

  The following code sample shows how to insert image in a PDF file in Java.

  Create a Table in PDF File in Java#

  The table is a fine way of organizing the data in the form of rows and columns. Aspose.PDF lets you insert a table in a PDF document quite easily.

  The following are the steps to create a PDF table in Java.

  • Load the source file using Document class.
  • Initialize a Table and set its columns and rows.
  • Set table’s setting (e.g. borders).
  • Populate the table by adding rows to it.
  • Add the table to a page.
  • Save the PDF file.

  The following code sample shows how to insert a table in a PDF in Java.

  Create Form in a PDF in Java#

  The PDF format also supports adding forms to collect input from the users. The form may contain various types of fields such as text boxes, radio buttons, etc. The following steps demonstrate how to insert a simple form in the PDF file.

  • Load the PDF document or create a new one using Document class.
  • Create the form field that you want to add such as TextBoxField.
  • Set properties of the field.
  • Add the field to the Form of the PDF using pdfDocument.getForm().add(Field, Int) method.
  • Save the PDF document.

  The following code sample shows how to create a form in a PDF file in Java.

  Read more about the form fields using here.

  Java: Generate PDF having Bookmarks#

  The following are the steps to add bookmarks in PDF file.

  • Open a PDF document using the Document object.
  • Add documents outlines to an OutlineItemCollection collection.
  • Set the destination page number.
  • Add the bookmark to the document’s outline collection.
  • Save the PDF file.

  The following code sample shows how to insert bookmarks in PDF using Java.

  Free Java PDF Generation Library#

  You can get a free temporary license and generate PDF files from scratch without any limitations.

  Explore Java PDF Library#

  You can explore more about the Java PDF API using documentation.

  Conclusion#

  In this article, you have learned how to create PDF files from scratch in Java. Furthermore, the Java code samples have demonstrated how to insert text, images, tables, forms, and bookmarks in new or existing PDF files. You can easily install the library in your application and generate your desired PDF files.

  See Also#

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