<jsp:useBean id="counter" class="comawljspbookch03CounterBean" scope="session"/> in Java

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<jsp:useBean id="counter" class="comawljspbookch03CounterBean" scope="session"/>
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<jsp:setProperty name="counter" property="incrementCount" value="1"/>
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You have visited this page <jsp:getProperty name="counter" property="count"/> time(s)
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This example doesn't look like anything special, but a user who accesses the page and repeatedly clicks the browser's reload button will see the counter steadily climb Two things make this page work The first is the way the incrementCount property works When this property is set, it adds its value to the count property, much as Listing 35 added the value1 and value2 properties to set the sum property More important, the secret to this page's functionality is the session scope, which keeps the bean around even after the page completes If the scope were changed to page or request, the counter would stay stuck at 1 perpetually
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The session scope extends across multiple pages, as well as across individual pages multiple times If the jsp:useBean and jsp:setProperty tags were copied into another page, the counter would then register the total number of times the user had visited both pages during the current session
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344 The Application Scope
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The application scope is the largest of the available scopes Beans placed in the application scope will be available to all pages, for all users, until the Web application is shut down or restarted This scope is useful for displaying global information, such as a "quote of the day" that might be displayed at the bottom of every page across a site The application scope can also be used to create a counter that displays the total number of times a page has been accessed A simple modification to Listing 38 counts how many times each user has accessed a page: To make this global, change scope="session" to scope="application"
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35 Special Actions When Beans Are Created
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Now that beans can live beyond the scope of a single page, any given instance of a jsp:useBean tag may or may not create a new instance of a bean Often a page will need to take a special action when the bean is first created This can be done with a simple extension to the jsp:useBean tag So far, this tag has been used without a closing /jsp:useBean tag If there is a matching close tag, anything in the body between the open and close tags will be evaluated when the bean is created and not subsequently The content enclosed by these tags can be anything at all For a start, it can be plain text Listing 39, a slight modification to Listing 38, illustrates this ability Listing 39 Displaying text when a bean is created
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<jsp:useBean id="counter2" class="comawljspbookch03CounterBean" scope="session">
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Welcome to the site!
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</jsp:useBean>
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With this change, the user will see the message "Welcome to the site" when the bean is created On the user's subsequent visits to this page, or any other using the counter bean, the message will not be displayed Note that the identifier counter2 is used to distinguish this bean from the one used in Listing 38 If this were not done, the counter would register how many times the user had been to either page, and if counterjsp were visited before counter2jsp, the welcome message would not show up In addition to text, the initialization block can contain jsp:setProperty tags This can be useful when the bean needs to have certain values before it is used In some cases, these default values can be placed in the bean itself, such as the initial value of 0 for the number of visits in the counter bean In other cases, the values with which the bean needs to be initialized may depend on the current user or the page or any of thousands of other possibilities Rather than putting values with these kinds of dependencies into the bean code, it makes more sense to let the page set up the beans as needed Listing 310 shows another addition to Listing 38 This time, the bean will be told the name of the page on which it was created Listing 310 Setting a value when a bean is created
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