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Pressing the OK button reads the information from the URL provided. The encoding, content length, and content type are displayed to the console so that we can inspect the values. The Title of the HTML page is then parsed and displayed to the screen. The MIDlet output is depicted in figure 13.3. The output to the console is as follows:

Note The Styles area does have limitations. First, you can only display it in Outline or Normal view. Second,

writer.createXmpMetadata();

In this case, the encoding is not known, the length, in bytes, is 176 and the content type is HTML.

Suppose you have a PDF file that only contains metadata in an info dictionary. In that case, you can use the following to add an XMP stream.

PdfReader reader = new PdfReader(src); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); HashMap<String, String> info = reader.getInfo(); Gets ByteArrayOutputStream baos = new ByteArrayOutputStream(); metadata XmpWriter xmp = new XmpWriter(baos, info); Creates and xmp.close(); adds XMP stamper.setXmpMetadata(baos.toByteArray()); stamper.close();

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Sockets can be used to implement communication between two systems and allow the network connection to be treated as a stream. Once a socket is established the stream can be read from, using an InputStream, or written to, using an OutputStream. The Generic Connection Framework provides two interfaces for working with streams, StreamConnectionNotifier and StreamConnection. StreamConnectionNotifier is used by a server to monitor a port for clients wanting to establish a connection. StreamConnection is used to establish a socket connection. The StreamConnection interface extends both InputConnection and OutputConnection, allowing both read and write capability on a single connection. In general, the interfaces InputConnection, DataInputConnection, OutputConnection, and DataOutputConnection are used in combination throughout the Generic Connection Framework to build more sophisticated connection types. Individually, they are not terribly useful since most connection protocols support both read and write capabilities. Before a client can request a socket connection to a listener, the listener must be listening to a designated port. To bind a socket listener application to a port using StreamConnectionNotifier the following syntax for the open command is used:

Extracting the XMP metadata from an existing PDF is done using the getMetadata() method on a PdfReader instance. Tools or applications that aren t PDF-aware will search through the file for an xpacket with the id shown in listing 12.3, so it s important that the stream containing the XMP metadata is never compressed.

StreamConnectionNotifier connection = (StreamConnectionNotifier) Connector.open("serversocket://:4444", Connector.READ_WRITE);

iText will never compress an XMP metadata stream; all other content streams are compressed by default. You ve already used the setCompressionLevel() method for the Image and BaseFont classes; you can also use it for PdfWriter to set the compression level for the other stream objects that are written to the OutputStream.

The next example uses different techniques to change the compression settings of a newly created PDF document.

The Connector knows to open a StreamConnectionNotifier by looking for the serversocket scheme. The port number is specified after the : in the address portion of the name. The port chosen is arbitrary so long as both the client and the socket listener use the same port number. Also, if the specified port number is unavailable, or another service is already bound to the port, the connection will be refused. Once a StreamConnectionNotifier is established, the socket listener waits for a client to attempt a connection using the acceptAndOpen() method.

PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename)); switch(compression) { No compression case -1: JVM-wide Document.compress = false; break; case 0: writer.setCompressionLevel(0); CompressionLevel 0 break; case 2: writer.setCompressionLevel(9); CompressionLevel 9 break; case 3: writer.setFullCompression(); Full compression break; }

StreamConnection sc = connection.acceptAndOpen();

it only shows styles applied to paragraphs. The Styles area will not display styles you apply to characters or portions of a paragraph. It is a handy feature, nonetheless.

The Document class has a static member variable, compress, that can be set to false if you want to avoid having iText compress the content streams of pages and form XObjects. Use this for debugging purposes only! It changes the behavior of iText for the whole JVM, and that s not a good idea because it will also affect PDF documents created in other processes using the same JVM. One option in listing 12.6 uses the method setFullCompression(). In the resulting PDF file, content streams will be compressed, but so will some other objects, such as the cross-reference table. This is only possible since PDF version 1.5. This is an example where iText will change the version number in the PDF header automatically from PDF-1.4 to PDF-1.5. Table 12.1 compares the file sizes of the PDFs produced with listing 12.6.

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