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When a client attempts to connect to the socket listener, the acceptAndOpen() method verifies that the connection can be established and opens a StreamCon-

Table 12.1 PDF and compression Option Without any compression (Document.compress = false) Compression level 0 File size 43,237 bytes Percentage 99.23%

100.00%

ready to read and write data from and to the stream. In order for the connection to be accepted by the listener, the client attempting the connection must be attempting to establish a socket connection. Other types of connections that the listener cannot handle or does not understand are refused. Clients connect to socket listeners by directly opening a StreamConnection.

PDF and compression (continued) Option File size 12,066 bytes 11,943 bytes 9,836 bytes Percentage 27.70% 27.41% 22.58%

StreamConnection connection = (StreamConnection) Connector.open("socket://127.0.0.1:4444", Connector.READ_WRITE);

As you can see, compressing as many objects as possible is the most effective option in this example, but be aware that the compression percentage largely depends on the type of content in the document.

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PdfReader reader = new PdfReader(src); PdfStamper stamper = new PdfStamper( reader, new FileOutputStream(dest), PdfWriter.VERSION_1_5); stamper.getWriter().setCompressionLevel(9); int total = reader.getNumberOfPages() + 1; for (int i = 1; i < total; i++) { reader.setPageContent(i, reader.getPageContent(i)); } stamper.setFullCompression(); stamper.close();

To open a socket from the client side, the socket scheme is used and both the host and port number must be specified in the address portion of the name. Note that the port numbers must be exactly the same when the connection is opened for both the client and the socket listener. If they are different you will not be able to establish a connection. Furthermore, if the socket listener at the host address is not listening to this port, or another type of service that cannot handle sockets is bound to this port, the connection will be refused with an exception stating that the connection was refused. If the connection is successful, the socket is ready to write and read data to and from the socket s input and output streams. Generally, the client is the first to write data to the stream, even if only to issue a command to the listener; however, this is not a requirement of sockets. Once a connection is successful, either side may initiate the conversion. Sockets provide a very useful means of communicating between systems; however, sockets only define the connection and the low-level data transport mechanisms, such as TCP/IP. How the client and socket listener deal with each other must be defined by the client and listener applications. 13.4.1 Writing to sockets Once we have a successful connection, an output stream may be obtained from the StreamConnection using the openOutputStream() or openDataOutputStream() methods.

You want the PdfStamper class to create a file with header PDF-1.5, because you re using the setFullCompression() method after the header has been written to the OutputStream. That s why you add the PDF version number to the parameter list of the PdfStamper constructor. Decompressing can be done exactly the same way by setting the compression level to zero, or by using the following code.

OutputStream os = connection.openOutputStream(); DataOutputStream os = connection.openDataOutputStream();

PdfReader reader = new PdfReader(src); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); Document.compress = false; int total = reader.getNumberOfPages() + 1; for (int i = 1; i < total; i++) { reader.setPageContent(i, reader.getPageContent(i)); } stamper.close(); Document.compress = true;

You can also use the Styles area to change a paragraph s style. Double-click the style name in the Styles area. In the Style dialog box, shown in Figure 2-18, select the new style and then click apply.

Once an output stream is obtained, the application can begin writing data using one of the various methods of the OutputStream. To make life easier, an OutputStream can be wrapped inside of other stream classes that provide richer data support when writing to the stream. For example, an OutputStream could be passed to a OutputStreamWriter to provide the means for dealing with character-based stream content rather than byte-based content. The OutputStreamWriter acts as a filter, converting the characters passed to the OutputStreamWriter methods into a byte representation of the data and passing this on to the appropriate OutputStream method.

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