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n several chapters of this book, we ve used examples taken from three different versions of our online bookshop application: Eshop, Eshopx, and Eshopf. In this chapter, we ll complete the description of those applications, so that you can use them as models for your own. All three versions have the same functionality and generate almost identical HTML pages. Their differences are in the way in which you implement their functionality. The main difference between the two versions we introduced in 2, Eshop and Eshopx, is that the JSP code in Eshop is in standard JSP syntax, while the code in Eshopx is in XML syntax. The third version of the application, named Eshopf and described in 5, is quite different from the first two, because we implemented it with JSF. This required us to replace the original servlet with the JSF servlet. Although we used Eshopx as a base for developing Eshopf, we obviously had to rewrite the user interface almost from scratch. You can download the complete code in the Source Code/Download area of the Apress web site (http://www.apress.com) and install each version of the application by copying the corresponding folder to Tomcat s webapps directory.

Any MySQL accounts without passwords should either be removed or assigned passwords. To find such accounts, look in the user table of the mysql database using the following query: mysql> SELECT * FROM user WHERE Password="; The accounts corresponding to any rows returned by this query are not secure and should be assigned passwords. To do this, you must specify both the user name and hostname associated with an account. Let s say that the values in the User and Host columns for an account having no password are baduser and myhost. If you want to assign a password of mypw to that account, then the SQL would look like this:: mysql> UPDATE user SET Password=PASSWORD('mypw') -> WHERE User='baduser' AND Host='myhost'; You can also use a SET PASSWORD statement: mysql> SET PASSWORD FOR 'baduser'@'myuser'=PASSWORD('mypw'); If you assign passwords with UPDATE, issue a FLUSH PRIVILEGES statement afterward to tell the server to reload the grant tables so the changes take effect.

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... @Named("uh") @SessionScoped public class UserHolder implements Serializable { private User currentUser; public User getCurrentUser() { return currentUser; } public void setCurrentUser(User currentUser) { this.currentUser = currentUser; } }

Toward the beginning of 2, in the Objects and Operations section, we described the objects this application deals with (product categories, books, shopping cart, and order) and the operations the user can perform on those objects. In the The Eshop Architecture section, we then described the MVC architecture of Eshop. In particular, we listed the methods of the DataManager class (Table 2-2), described the initialization of the servlet (Listing 2-1 and Table 2-3), summarized how the servlet handles incoming requests, and listed the JSP pages (Table 2-4). We also took you through a typical user session. In 4, we showed you the code of Category.java (Listing 4-1) and described the script shop.sql (Listing 4-2), which creates the shop database containing categories, books, and orders. We then devoted the whole DB Access in Eshop section to describing how the data manager updates the database via the peer methods (Figure 4-1 and Listings 4-3 to 4-6). In this chapter, we ll start by listing all the subfolders and files in the Eshop application folder (see Listing 8-1, where the folder names are in bold).

A MySQL account is identified by both a user name and a hostname, which are found in the User and Host columns of the user table The User value is the name that a client must supply when connecting to the server The Host value indicates the host or hosts from which the user is allowed to connect If this is a literal hostname, the account is limited to connections only from that host If the hostname is a pattern such as %xyzcom or % that contains the '%' wildcard character, the user can connect from any host in the xyzcom domain or from any host at all From a security standpoint, literal Host values are best and % is the worst.

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