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The result is a document whose PDF syntax can be seen in the content streams of each page when opened in a text editor. This can be handy when you need to debug a PDF document. We ll take a closer look inside the content stream of a PDF in part 4.

PdfStamper keeps existing stream objects intact when it manipulates a document, which means the compression level won t be changed. As a workaround, you can use the getPageContent() method to get the content stream of a page, and the setPageContent() method to put it back. When you do so, iText thinks the stream has changed, and it will use the compression level that was defined for PdfStamper s writer object.

stream, flushing the stream and closing the stream. All other output stream classes either extend or wrapper instances of OutputStream. DataOutput

Suppose your PDF contains confidential information that should only be seen by a limited number of people. Or you want to enforce access permissions to the people who download the PDF; for instance, they can view it, but they are not allowed to print it. In that case, you ll want these content streams to be encrypted.

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DataOutput is an interface that defines the methods for converting data from primitive types, such as int, long, boolean, etc. to an array of bytes that can be written to an output stream. This interface also provides the ability to convert Java Strings

The PDF standard security handler allows access permissions and up to two passwords to be specified for a document: a user password (sometimes referred to as the open password) and an owner password (sometimes referred to as the permissions password). In this section, we ll start with encrypting and decrypting PDFs using passwords, and we ll move on to public-key encryption, which is a much more robust way to protect your documents.

WARNING The examples in the remainder of the chapter involve encryption or digital signing. If you want them to work, you ll need extra encryption JARs in your classpath. For iText 5.0.x, the Bouncy Castle JARs are required (see section B.3.1). Later versions of iText can use different libraries. Check itextpdf.com for the most current information.

to UTF-8 format that in turn is written as a byte array to an output stream. DataOutputStream DataOutputStream extends OutputStream and implements the DataOutput interface to provide the ability to deal with byte, character and UTF encoded data in a machine-independent manner. ByteArrayOutputStream A ByteArrayOutputStream extends OutputStream and provides dynamic buffering capabilities for writing to byte streams. As data is written to the ByteArrayOutputStream, the buffer grows automatically. This class supplies two useful methods for retrieving the data as a byte array, using toByteArray(), or as a String, using the toString() method. Writer

Listing 12.9 shows how to create a PDF document that is protected with two passwords. The maximum password length is 32 characters. You can enter longer passwords, but only the first 32 characters will be taken into account. One or both of the passwords can be null.

Writer is an abstract class that provides support for writing to character streams as opposed to bytes. Java uses a naming convention of Writer in the java.io pack-

public static byte[] USER = "Hello".getBytes(); public static byte[] OWNER = "World".getBytes(); public void createPdf(String filename) throws IOException, DocumentException { Document document = new Document(); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename)); writer.setEncryption(USER, OWNER, PdfWriter.ALLOW_PRINTING, PdfWriter.STANDARD_ENCRYPTION_128); writer.createXmpMetadata(); document.open(); document.add(new Paragraph("Hello World")); document.close(); }

Word includes a variety of styles for you to use. But you may want to create your own styles. Fortunately, creating a style is not as difficult as you would assume. The easiest way to create a style is to base it on a portion of the document. First, apply the formats you want to include in the style to part of your document. Paragraph styles can include character formatting such as bold, italics, underline, font color, and font size. Additionally, you can include alignment, margins, line spacing, and indents. Once you have formatted the text, you have three options for defining the style. First, you can click in the Styles box on the Formatting toolbar and type a name for the style. Or, in the Styles and Formatting task pane, click the New Style button. Type a name for the style in the Name box, as shown in Figure 2-19, and click OK. Lastly, you can use the Styles area. Double-click the style name next to the formatted paragraph. In the Style dialog box, click New. Type a name for the style in the Name box and click OK.

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