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The sessionId is the string captured from the first HTTP response we received from the Servlet. The connection is the current HttpConnection instance. Data is sent to the Servlet differently depending on whether we are doing a GET or a POST. As previously discussed, if the request method is GET, the data can be passed on the URL as a parameter or on the data stream. For POST requests data is passed on the data stream. The following illustrates how to send data to the servlet: 340 INTEGRATING THE SERVER

You create an image with 8 pixels x 8 pixels, using one component and 1 bit per component, which makes 64 bits in total. You can store these bits in an array containing 8 bytes. Internally, iText will create a CCITT image. When you make it a mask with the method makeMask(), you tell iText that this image is a stencil mask. This means that the bit value doesn t define a color (black or white), but rather whether the pixel is opaque or transparent. Normally, the value 1 will be opaque, and 0 transparent, but you change this with the method setInverted(). You can now apply the mask to the JPEG image:

Image img = Image.getInstance(RESOURCE); img.setImageMask(mask);

byte[] dataOut = data.getBytes(); DataOutputStream os = connection.openDataOutputStream(); try { os.write(dataOut); os.flush(); } finally { os.close(); }

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The mask parameter can also be a soft mask. That s the case in the image shown to the right in figure 10.11.

In some cases, calling flush() causes the HTTP implementation to send data in chunks rather than all at once. Removing the call to flush() can remedy this problem, since closing the data stream will flush the buffer as well.

The code in the next listing should look very familiar. The first part is identical to what you did in listing 10.8 when you created a gradient in the DeviceGray color space.

Once data is written to the HttpConnection, an InputStream is opened to wait for the response as follows:

byte gradient[] = new byte[256]; for (int i = 0; i < 256; i++) gradient[i] = (byte) i; mask = Image.getInstance(256, 1, 1, 8, gradient); mask.makeMask();

Note If you are working with others on the same document and want to track their changes, make sure

The only difference here is that you now use the makeMask() method so that you can use the resulting Image as a parameter for the setImageMask() on another Image. If using masks is too complex for what you need, you can also use simple PDF syntax to clip an image.

StringBuffer sb = new StringBuffer(); DataInputStream is = connection.openDataInputStream(); try { long len = connection.getLength(); int c = 0; for (int ccnt=0; ccnt < len; ccnt++){ c = is.read(); sb.append((char)c); } String dataIn = sb.toString(); } finally { is.close(); }

The first image in figure 10.5 is a picture of my wife and me, taken at the Flanders International Film Festival in Ghent. In the foreground you see a phenakistoscope. That s an early animation device, invented in 1832 by Joseph Plateau, (also) a citizen of Ghent. Nowadays, it s the Belgian version of the Oscar statue. Unfortunately, I didn t win one of these Belgian Oscars (yet); the picture was an initiative of one of the sponsors of the film festival. Suppose I want to use only the upper half of this photograph in a PDF document because the lower half shows the name of the sponsor. This is done in figure 10.12. Using a mask isn t the best way to achieve this. Instead, we ll clip the image.

The full EnterpriseClient code listing follows in listing 12.2:

If you want to cut a rectangle out of the original image, as is done in the PDF to the left in figure 10.12, you could create a PdfTemplate object that is smaller than the original picture, and add the Image object to it.

Image img = Image.getInstance(RESOURCE); float w = img.getScaledWidth(); float h = img.getScaledHeight(); PdfTemplate t = writer.getDirectContent().createTemplate(850, 600); t.addImage(img, w, 0, 0, h, 0, -600); Image clipped = Image.getInstance(t); clipped.scalePercent(50); document.add(clipped);

package com.ctimn; import import import import java.io.*; javax.microedition.io.*; javax.microedition.midlet.*; javax.microedition.lcdui.*;

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