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Tomcat s .\webapps directory is where you deploy your web application. Webapps are deployed as WAR files, which are just JAR files with a .war extension. WAR files contain a .\WEB-INF directory, with a web.xml file to configure Tomcat. Your Java classes and third-party JAR files go into WEB-INF\classes and WEB-INF\lib, respectively. Two very important servlet classes are HttpServletRequest and HttpSession.

n servlet-speak, a variable s scope refers to its lifetime in a web application how long the variable exists in the course of a user s interaction with the system. A variable s scope also determines its visibility who can read and change the variable. Web applications routinely utilize this concept, so you must become thoroughly familiar with it. You ll do just that in this chapter. Servlet technology uses four types of scope. Listed in decreasing lifetimes, they are as follows: Application scope: Application-scoped variables are visible to every page of the web application, all the time. The variable is visible to all users of the system and exists across multiple user sessions. In other words, different users can potentially view and change the same variable at any time and from any page. Session scope: Session-scoped variables exist only for a single-user session, but they are visible to every page in that session. Users would not be able to view or change each other s instance of the variable. Request scope: Request-scoped variables exist only for a single request. This includes page redirects. So, if request-scoped variable x = 7 on the first page is redirected to a second page, then x = 7 on the second page too. Page scope: A page-scoped variable exists only on the current page. This does not include redirects. So, if a page-scoped variable x = 8 on the first page is redirected to a second page, then x is undefined on the second page.

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Examine the diagram carefully in Figure 7-4. Make sure your Arduino is powered off while connecting the wires. The wiring from the MAX7219 to the dot matrix display in Figure 7-4 is set up for the display unit I used for creating this project. The pins on your display may differ. This isn t relevant, just wire up the pins coming out of the MAX7219 to the appropriate column and row pins on your display (see Table 7-3 for the pinouts). Reading horizontally will show which two devices are connected and to what pins. On the display, the columns are the cathodes and the rows are the anodes. On my display, I found Row 1 was at the bottom and Row 8 the top. You may need to reverse the order on your own display if you find your letters are upside down or back to front. Connect the 5V from the Arduino to the positive rail of the breadboard and the ground to the ground rail.

Note A redirect occurs when you ask for one page but are given another. The page you asked for redirects you to the page you actually get. You can do this in JSP with the <jsp:forward> tag, which you will see in action in Lab 3 later in this chapter.

Sumner Blount action, your ability to correct the problem in a timely way will be limited at best. Example KPIs include your rate of on-time delivery, rate of customer retention, quality of materials, and so on. Left unchecked, each of these could cause big changes in your financial performance. Let s look at an example to illustrate this point. Suppose you define this KRI: Turnover Rate of Key IT Administrators. If this rate increases significantly, it s likely that IT effectiveness will decrease. System downtime will probably go up, and partners and distributors will have trouble getting product information as needed or placing their orders. So, you can define the KPI Partner Order Rate, which is the rate at which your partners orders are coming in as compared to the historical average (see Figure 4-6).

Figure 7-4. The circuit for Project 21 (see insert for color version) Table 7-3. Pinouts between the Arduino, IC, and the Dot Matrix Display

Session and request scopes are the two most important scopes in Struts. To see if you really understand these ideas, try the following lab.

Digital 2 Digital 3 Digital 4 4, 19

Consider the following two JSP pages (Listings 3-1 and 3-2) and assume they ve been loaded onto a servlet container. Your job is to predict the output on the screen as two users, Audrey and Brenda, interact with the system.

<jsp:useBean id="myVariable" scope="application" class="java.lang.StringBuffer" /> <% myVariable.append("1"); %> <jsp:forward page="Second.jsp" />

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