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Figure 4-9. Drag a value to a new position in the PivotTable Field List pane. 4. Release the mouse button, and the Avg WO button will drop above the Total WO button. In the pivot table on the worksheet, the value fields switch places, and the Avg WO column is to the left of the Total WO column. Another way to change the value field order is to make the change directly in the pivot table. 1. In the pivot table, select the cell that contains the heading Avg WO. 2. Point to the border of the cell, and when the pointer changes to a four-headed arrow, drag the heading cell to the right of the Total WO cell. 3. As you drag the field, a gray bar will appear to the right of the Total WO field, indicating where the field will be dropped (see Figure 4-10).

The words Hello World are still mangled, but the text Hello People is picked up correctly. In listing 15.24, you use the class TextRenderInfo to get a chunk of text with the getText() method, but the render info class also provides methods to get LineSegment objects containing information about the location of the text on the page, to get the font that was used, and so on. With this information, you could write a RenderListener implementation that returns a result that is much better than the output provided by MyTextRenderListener. Fortunately, this has already been done for you in the form of text-extraction strategies. The TextExtractionStrategy interface extends RenderListener, adding a getResultantText() method. The different implementations of this interface, in combination with the PdfReaderContentParser or PdfTextExtractor, dramatically reduce the number of code lines needed to extract text.

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Figure 15.7 shows two pages the preface from the first edition of iText in Action. The PDF was extracted from the eBook version of the book. It s a traditional PDF without structure. Let s try to convert the content from these two pages to a plain text file.

There are two main possible approaches you can take for this. The first is illustrated by the following sequence of actions, which needs to be executed each time the database needs to be accessed. 1. Open a connection to the database exactly before you need to execute a command on the database. 2. Execute the SQL query (or the database function) using the open connection, and get back the results. At this stage, you also need to handle any possible errors. 3. Close the database connection immediately after executing the command. This method has the advantage that you don t keep database connections for a long time (which is good because database connections consume server resources) and is also encouraged for servers that don t allow many simultaneous database connections. The disadvantage is the overhead implied by opening and closing the database connection all the time, which can be partially reduced by using persistent connections.

The next example shows how to use SimpleTextExtractionStrategy in combination with PdfReaderContentParser to create a plain text file with the content of the preface.

Figure 4-10. Drag a value to a new position in the pivot table. 4. Release the mouse button, and the Avg WO field will drop to the right of Total WO. In the PivotTable Field List pane, the value fields switch places, and Avg WO is below Total WO.

PdfReader reader = new PdfReader(pdf); PdfReaderContentParser parser = new PdfReaderContentParser(reader); PrintWriter out = new PrintWriter(new FileOutputStream(txt)); TextExtractionStrategy strategy; for (int i = 1; i <= reader.getNumberOfPages(); i++) { strategy = parser.processContent(i, new SimpleTextExtractionStrategy()); out.println(strategy.getResultantText()); } out.flush(); out.close();

Note Persistent connections refers to a technology that attempts to improve the efficiency of opening

The PdfReaderContentParser uses the PdfContentStreamProcessor internally. The processContent() method performs the same actions you did in listing 15.23, saving you a handful of lines of code. The SimpleTextExtractionStrategy class is a special implementation of the RenderListener. It stores all the TextRenderInfo snippets in the order they occur in the stream, but it s intelligent enough to detect which snippets should be combined into one word, and which snippets should be separated with a space character.

This TextExtractionStrategy object, containing all the text of a specific page, is returned by the processContent() method. When you get the resulting text of the first page of the Preface, it starts like this:

and closing database connections with no impact on functionality. You can learn more about this technology at http://www.php.net/manual/en/features.persistent-connections.php.

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