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Listing 8-3. CategoryPeer.java getAllCategories Method public static Hashtable getAllCategories(DataManager dataManager) { Hashtable<String, String> categories = new Hashtable<String, String>(); Connection connection = dataManager.getConnection(); if (connection != null) { try { Statement s = connection.createStatement(); String sql = "select category_id, category_name from categories"; try { ResultSet rs = s.executeQuery(sql); try { while (rs.next()) { categories.put(rs.getString(1), rs.getString(2)); } } finally { rs.close(); } } finally {s.close(); } } catch (SQLException e) { System.out.println("Could not get categories: " + e.getMessage()); } finally { dataManager.putConnection(connection); } } return categories; } We ve highlighted the lines that do all the work: first, the database query is performed, and then the result is saved in a hash table in which the key is the category ID and the value is the category name. LeftMenu.jsp uses the content of the hash table to generate one link for each category, as in the following example: <a href=/eshop/shop action=selectCatalog&id=3>Action Novels</a> Notice that the action parameter is set to selectCatalog. This is done for all categories and causes ShopServlet to forward the request to /jsp/SelectCatalog.jsp when the user clicks on a category name. As you can see from the code of CategoryPeer.java, we took great care to ensure that the database connection is closed before the method returns. Also notice that we logged a message to the standard output (mapped by Tomcat to the file stdout_yyyymmdd.log) if the database couldn t be accessed. In a real-world application, you should throw an exception with an error message to be displayed to the user.

When the session ID changes with login (as we recommended in 7 that it should do), a record of the change can be logged and then used to tie the two (or more) sessions into a unified sequence of requests and responses Date and time: Each log record should be stamped with information about the date and time of its creation The date format used by system logs is PHP s date() syntax, M j H:i:s, which would represent for example the date and time Jun 5 15:04:33 You will probably find it more useful, however, to use the MySQL date format, Y-m-d H:i:s, which includes the year: 2005-06-05 15:04:33 User ID: If the user is logged in, her user ID is also available You should include that also in each log record, so that the owner of the session can be determined without consulting some other lookup table.

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As you saw in the previous section, when the user selects a book category or performs a search, the pages displayed are SelectCatalog.jsp and SearchOutcome.jsp, respectively. Both pages display a list of books and are similar to each other. Actually, they are so alike that we merged them into a single page in the JSF version of the application, Eshopf, as you ll see later in this chapter. In SelectCatalog.jsp, the requested category is specified by the id parameter. To obtain the category name, you execute the DataManager method getCategoryName: public String getCategoryName(String categoryID) { Category category = CategoryPeer.getCategoryById(this, categoryID); return (category == null) null : category.getName(); } which loads the category record from the database via the corresponding peer method. In SearchOutcome.jsp, the search string is in the keyword parameter. To obtain the list of books, SelectCatalog.jsp executes the following statement in a scriptlet: ArrayList books = dataManager.getBooksInCategory(categoryId); while SearchOutcome.jsp executes this statement: ArrayList books = dataManager.getSearchResults(keyword); For each book in the list, both pages generate a link such as the following one: <a class="link1" href="/eshop/shop action=bookDetails&bookId=3">Details</a> With the action parameter set to bookDetails, ShopServlet forwards the request to BookDetails.jsp.

Suppose that you d like to develop the application shown in Figure 2 1. That is, if the user enters a stock symbol and clicks the button, then the application will display the stock value.

Request URI: Since an action is typically requested to be carried out on some location (or URI), this location should be captured as well Request data: If the request includes data that is to be used by your application, you may choose to capture it, although this would almost certainly be too much information for most logging schemes Posted data might be filtered to just the few most relevant fields, or described by size, number of key-value pairs, size and MIME type of any posted files, and so on..

By now, the mechanism should be pretty clear: each JSP page passes its key request parameter to a DataManager method that encapsulates the business logic. This is how the view and the model of the MVC architecture are kept separate, making it possible for the web page designers and the software developers to work independently. One creates pretty and clear pages, and the other handles the databases. The signatures of the data model methods are the only interface needed between page designers and software developers. BookDetails.jsp passes the bookId request parameter to the DataManager method getBookDetails: public Book getBookDetails(String bookID) { return BookPeer.getBookById(this, bookID); }

Let s create the example application now. In Eclipse, copy the Hello project, and paste it as a new project called Stock. Then choose Window Show View Navigator, and locate the org.eclipse.wst.common.component file shown in Figure 2 2.

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