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The setup and configuration of Servlet engines is beyond the scope of this text. For more information regarding Servlets in general please refer to Java Servlets by Example, by Alan R. Williamson (Manning Publications). Creating the servlet The servlet we create to handle the GET and POST requests sent by the EnterpriseClient is rather straightforward. All we need to do is accept the data, increment a counter, and return a response. However, to fully understand everything that is going on, our servlet prints a fair amount of information to the console regarding each request. Specifically, the information in which we are interested is the list of parameters sent by the client, HTTP header information and any cookie data. Also, in order to know if our session tracking is working properly, we will keep a counter of how many times the servlet is accessed and print this to the console as well. The first step in creating a servlet is to declare the class by extending the HttpServlet class that resides in the javax.Servlet.http package. The name of our Servlet is EnterpriseServletExample.

The value that has to be shown by the barcode is set with the method setCode(), except for BarcodeEANSUPP. The example shows how to create a Bookland barcode composed of two BarcodeEAN instances: one with type EAN13 and one with type SUPP5.

document.add(new Paragraph("Bookland")); document.add(new Paragraph("ISBN 0-321-30474-8")); codeEAN.setCodeType(Barcode.EAN13); codeEAN.setCode("9781935182610"); BarcodeEAN codeSUPP = new BarcodeEAN(); codeSUPP.setCodeType(Barcode.SUPP5); codeSUPP.setCode("55999"); codeSUPP.setBaseline(-2);

public class EnterpriseServletExample extends HttpServlet { }

BarcodeEANSUPP eanSupp = new BarcodeEANSUPP(codeEAN, codeSUPP); document.add(eanSupp.createImageWithBarcode(cb, null, BaseColor.BLUE));

There are several methods available for dealing with connections to the Servlet, namely doGet(), doPost() and service(). The service() method is the most generic and is always called for any HTTP request. In the case of doGet(), this method is called to handle an HTTP GET request. Likewise a doPost() is called in response to an HTTP POST request. For our purposes the service() method will be used.

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The barcodes example contains code samples for every type of barcode. The barcodes are added to the document as an Image that is created with the createImageWithBarcode() method. As an alternative, you can write the barcode directly to a PdfContentByte object with placeBarcode(), or create a PdfTemplate with createTemplateWithBarcode(). These methods take three parameters:

Save the Normal.dot template. To ensure the template is indeed saved as a template, select .dot in the drop-down box labeled Save as type in the Save As dialog box (see Figure 9-13).

PdfContentByte cb The direct content of the PdfWriter to which the bar-

The following is a list of tasks performed by the servlet. As mentioned, most of the tasks listed simply print out information in which we are interested as the Servlet processes the request. prints initial information, such as request type, etc. prints parameter information prints HTTP header information prints cookie information processes the session counter processes data input initializes the data to be sent processes the response

You can also create a java.awt.Image of the barcode using the createAwtImage() method. This method expects two colors of type java.awt.Color (as opposed to com.itextpdf.text.BaseColor). The first one represents the color of the bars; the second one defines the background color. No text is added to these barcodes. The subclasses of the Barcode class have a lot of properties in common that can be set with methods in the abstract superclass. Table 10.4 presents an overview showing the default value for each property.

The primary function of our servlet is to capture the data sent from the client and return a response. The data can be obtained from the HTTP stream in the same manner regardless of the method type. The following code illustrates how to do this:

Table 10.4 Code: type x n font size baseline bar height text align guardbars generate checksum text checksum start/stop text true User User 8 Default properties of the different barcode classes EAN EAN13 EANSUPP 128 CODE128 0.8f 2 Inter25 39 Codabar CODABAR Postnet POSTNET 0.02f * 72f 72f / 22f 0.05f * 72f 0.125f * 72f -

private String processDataInput(HttpServletRequest request) throws IOException { int len = request.getContentLength()+2; Adjust length, MIDP String s = ""; reference impleSystem.out.println("Request Content Length = "+len); mentation only if (len > 0) { System.out.println("Reading data from request:"); BufferedReader reader = request.getReader(); char[] buffer = new char[len]; int i = reader.read(buffer, 0, buffer.length); s = new String(buffer); System.out.print(" Data.............:"); System.out.println(s); System.out.println(" Data Length .....:"+i); } return s; }

BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.NOT_EMBEDDED);

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