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The CCITT protocols described in this section are used to send a document as an image from one fax to another. You could use iText to import a stream received from your fax into a PDF file. iText also uses CCITT internally to create images that need to be read by a machine, such as two-dimensional barcodes.

The J2ME implementation of the HttpConnection protocol supports HTTP version 1.1. If the server software does not provide full HTTP 1.1 support you may experience flaky and inconsistent behavior.

You may not look at barcodes as images, but in iText it s common to add a barcode to a document as an instance of the Image object. The same goes for matrix codes, which are often referred to as two-dimensional barcodes. Listing 10.9 shows how these barcodes were created. Figure 10.5 has a barcode in the EAN-13 format containing the ISBN number of this book. The second barcode is a matrix code in the PDF417 format containing the text iText in Action, a book by Bruno Lowagie. Internally, the first barcode is added to the document as an instance of ImgTemplate; the second one is an ImgCCITT object.

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To add your own AutoText entries, click Insert AutoText and select AutoText on the submenu. In the Box labeled Enter AutoText Entries here, type your AutoText entry (see Figure 9-12). Then click Add. Repeat for each entry you d like to create. Once you re done, click OK.

BarcodeEAN codeEAN = new BarcodeEAN(); codeEAN.setCodeType(Barcode.EAN13); codeEAN.setCode("9781935182610"); img = codeEAN.createImageWithBarcode( writer.getDirectContent(), null, null); document.add(img); BarcodePDF417 pdf417 = new BarcodePDF417(); String text = "iText in Action, a book by Bruno Lowagie."; pdf417.setText(text); img = pdf417.getImage(); document.add(img);

In the example, the EnterpriseClient allows a text message to be entered. The servlet processes the request by incrementing a counter, which is tracked using a cookie, and echoes the submitted text back to the client. In order to run this example you will need a servlet engine of some sort that provides full support of the HTTP 1.1 protocol. This example uses WebLogic 6.1.

Table 10.3 shows an overview of these subclasses, along with the types of barcodes they can produce.

Tomcat version 3.x, a widely used open source application server, does not provide full support for HTTP 1.1. As a result, the first time the client contacts the server the request usually succeeds but subsequent attempts to contact the server tend to fail. Upgrading to Tomcat 4.0, or using another HTTP 1.1 compliant Servlet engine will solve this problem.

Table 10.3 Barcode classes and barcode types Barcode type EAN-13, UPC-A, EAN-8, UPC-E Description EAN stands for European Article Number code; UPC for Universal Product Code. Each type represents a number with a different number of digits. EAN-13, UPC-A, EAN-8, and UPC-E allow for a supplemental two- or five-digit number to be appended to the main barcode. For instance, if you add a supplemental five-digit barcode to an EAN-13 barcode representing an International Standard Book Number (ISBN), you get a Bookland code. Code 128 provides much more detail than the single-product EAN barcodes. It s used to describe properties such as the number of products included, weight, dates, and so on. A numerical barcode that encodes pairs of digits: the first digit is encoded in the bars; the second digit is encoded in the spaces interleaved with them. Two out of every five bars or spaces are wide (hence 2 of 5). The United States Postal Service (USPS) uses a combination of the Postal Numeric Encoding Technique (POSTNET) sorting code and the Postal Alphanumeric Encoding Technique (PLANET) code to direct and identify mail. Currently, three forms of POSTNET codes are in use: a 5-digit ZIP code, a 9-digit ZIP+4, and an 11-digit delivery point code. The PLANET code is an 11-digit code assigned by USPS. The 3 of 9 code can encode numbers, uppercase letters (A Z), and symbols (- . $ / + % *). Codabar is used to store numerical data only, but the letters A, B, C, and D are used as start and stop characters.

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