barcode generator source code in c#.net Using iText s basic building blocks in Java

Creator QR in Java Using iText s basic building blocks

Using iText s basic building blocks
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This chapter covers
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An overview of the database used in the book s examples An overview of the basic building blocks: Chunk, Phrase, Paragraph, List, ListItem, Anchor, , Section, and Image
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This chapter describes a series of high-level objects that can be used as basic building blocks. These objects allow you to generate PDF documents without having to bother with PDF syntax. Figure 2.1 is a UML diagram that serves as a visual table of contents, presenting the building blocks discussed in this chapter. This class diagram is far from complete. All the methods, as well as a number of member variables, were omitted for the sake of clarity. The diagram will help you to understand in one glance how the interfaces and classes relate to each other. We ll discuss a first series of objects in section 2.2: Chunk, Phrase, Paragraph, and List. In section 2.3, we ll cover a second series: Anchor, , Section, and Image. But before starting to build documents using these building blocks, let s have a look at the database you ll publish to different PDF files in the upcoming examples.
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Illustrating the examples with a real-world database
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UML class diagram, presenting the building blocks that will be discussed in this chapter
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Illustrating the examples with a real-world database
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The main theme of the examples in this book is movies. I ve made a selection of 120 movies, 80 directors, and 32 countries, and I ve put all this information in a database. The entity relationship diagram (ERD) in figure 2.2 shows how the data is organized. There are three main tables, consisting of movies, directors, and countries. Furthermore, there are two tables connecting these tables. For the examples in this book, we ll use the HSQL database engine (http:// hsqldb.org/). This is a lightweight database that doesn t need to be installed. Just add hsqldb.jar to your classpath and you re set. You ll find this JAR in the lib directory. The
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Figure 2.2 Film database entity relationship diagram
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HSQL database is in the db subdirectory of the resources folder. When you execute an example using the movie database, the contents of the filmfestival.script file will be loaded into memory, and you ll see temporary files appear in the directory as soon as you start using the database. I wrote a couple of convenience classes to hide the complexity of the database. The abstract class DatabaseConnection wraps the java.sql.Connection class, and it s extended by the HsqldbConnection class. Listing 2.1 DatabaseTest.java
PrintStream out = new PrintStream(new FileOutputStream(RESULT)); DatabaseConnection connection = new HsqldbConnection("filmfestival"); Creates connection Statement stm = connection.createStatement(); to HSQL database ResultSet rs = stm.executeQuery( "SELECT country FROM film_country ORDER BY country"); while (rs.next()) { out.println(rs.getString("country")); } stm.close(); connection.close();
This is a small standalone example to test the database connection. It writes the 32 countries from the film_country table to a file named countries.txt. I ve also created a class named PojoFactory, along with a series of plain old Java objects (POJOs), such as Movie, Director, and Country. These classes hide most of the database querying. In the examples that follow, you ll find code that looks like this:
List<Movie> movies = PojoFactory.getMovies(connection); for (Movie movie : movies) { document.add(new Paragraph(movie.getTitle())); }
Each instance of the Movie class corresponds with a record in the film_movietitle table. In the following sections and chapters, you ll create numerous PDF files from a database, but you ll hardly ever be confronted with difficult database queries or database-related Java syntax. The database aspects of the examples won t get any more complex than in the first examples of the next section.
Adding Chunk, Phrase, Paragraph, and List objects
The general idea of step E in listing 1.1 in the PDF-creation process using document.add() is that you add objects implementing the Element interface to a Document object. Behind the scenes, a PdfWriter and a PdfDocument object analyze these objects and translate them into the appropriate PDF syntax, positioning the content on one or more pages, taking into account the page size and margins. In this section, we ll explore text elements that implement the TextElementArray interface. As the name of the interface indicates, these objects will be composed of different pieces of text; most of the time, it will be text wrapped in Chunk objects.
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