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Adding content In this section, we re creating simple Hello World PDF documents, learning the elementary mechanics of iText s PDF creation process. Once these are understood, you can start generating real-world documents containing real-world data. To learn how to implement step E, you ll copy steps B, C, D, and F from listing 1.1 into an application, then focus on step E: adding content to the PDF document. There are different ways to add content. Up until now, you ve been adding one or more high-level objects of type Paragraph to the Document. In the next chapter, you ll learn about other objects, such as Chunk, Phrase, Anchor, and List. You can also add content to a page using low-level methods.
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Listing 1.11 shows a variation on this chapter s initial Hello World example. Although this is a rather complex example for a first chapter about using iText, it will give you an idea of iText s internal PDF-creation process.
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Listing 1.11 HelloWorldDirect.java
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Document document = new Document(); Step 1 PdfWriter writer = PdfWriter.getInstance( document, new FileOutputStream(RESULT)); document.open(); PdfContentByte canvas = writer.getDirectContentUnder(); writer.setCompressionLevel(0);
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Introducing PDF and iText
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// q // BT // 36 788 Td // // // // /F1 12 Tf (Hello World)Tj ET Q
canvas.saveState(); canvas.beginText(); canvas.moveText(36, 788); canvas.setFontAndSize( BaseFont.createFont(), 12); canvas.showText("Hello World"); canvas.endText(); canvas.restoreState(); document.close();
Step 4
Step 5
Steps B, D, and F are the same as they were in listing 1.1, but you need to make a small change to step C. Instead of using an unnamed instance of PdfWriter, you now give it a name: writer. You need this instance because you want to grab a canvas on which you can draw lines and shapes, and, in this case, text. In listing 1.11, comment sections were added, reflecting the PDF syntax that is written by each method. By using the setCompressionLevel() method with a parameter of 0, you avoid compressing the stream. This allows you to read the PDF syntax when opening the file in a text editor. Figure 1.7 shows the resulting PDF when opened in WordPad. This screenshot contains less gibberish than figure 1.6, though it s showing the syntax of a similar Hello World PDF. You ll recognize the PDF header, followed by a PDF object with number 2: 2 0 obj. After reading part 4 of this book, you ll understand that this object is a stream object, the content stream of the first page. In figure 1.6, the content stream was compressed, but in figure 1.7, the compression is zero. You can see the syntax in clear text, although you ll need to read chapter 14 to decipher what it means. Setting the compression level to 0 can be interesting if you need to debug your PDF file, but you shouldn t change the compression level in a production environment, because the file size of the resulting PDFs will be bigger than files generated using the default compression level.
NOTE
As you move on in this book, you ll find out that you ll need to add content directly to the page on different occasions, such as when adding page numbers, or when drawing
Figure 1.7 PDF document opened in WordPad
Creating a PDF document in five steps with iText
custom borders for tables. As you might imagine, you ll need a sound understanding of the PDF reference to achieve all this. I ve added text using low-level methods and it doesn t respect the margins, nor does the text wrap at the end of the line. What is wrong That is expected behavior. When adding content like this, you need to do all the math necessary to split a String in different lines, and add it at the appropriate coordinates. Also, make sure that you don t add the text outside the visible area of the page; this is a common mistake when adding text to an existing PDF document.
Listing 1.11 gets increasingly complex as soon as you need to add more text. Fortunately, iText comes to the rescue: you can use convenience classes and methods that significantly reduce the complexity and the lines of code needed to work with direct content.
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