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Searches for an attribute object with the specified name in the page, request, session, and application scopes, in that order, returning the first one found, or null, if none is found Returns the attribute object with the specified name in the given scope The scope parameter value should be selected from among the PAGE_CONTEXT, REQUEST_CONTEXT, SESSION_ CONTEXT, and APPLICATION_ CONTEXT constants provided in the PageContext class Removes the attribute object having the specified name in the given scope Stores an object as a named attribute in the given scope The scope parameter value should be selected from among the PAGE_CONTEXT, REQUEST_ CONTEXT, SESSION_CONTEXT, and APPLICATION_CONTEXT constants defined in the PageContext class

Dim xml As XElement = XElement.Load("..\..\People.xml") Dim role As XElement = xml.Descendants("idperson").First() Console.WriteLine("-=-=ORIGINAL-=-=") Console.WriteLine(role) role.SetAttribute("year", "2006") Console.WriteLine(String.Empty) Console.WriteLine("-=-=UPDATED-=-=") Console.WriteLine(role)

Object getAttribute(String name, int scope)

void removeAttribute(String name, int scope) void setAttribute(String name, Object value, int scope)

Table 7-4

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HTTP is a stateless protocol, which means it doesn t remember from one request to the next anything about previous requests However, Web applications frequently involve more than one request For example, an application may begin with some kind of user identification and validation that must be propagated through several other Web pages The continuity required for this type of application must be provided by something other than the Web server Several approaches can be taken to accommodate this need, depending on the requirements of the application 14 explores a number of these alternatives in detail, including: I Hidden fields I Cookies I URL rewriting I HTTP sessions The last item mentioned is of interest here An HttpSession is a Hashtable-like object associated with a single Web browser session It persists between HTTP requests and can store named objects of any kind By default, the JSP container creates an HttpSession object or accesses the currently active one at the beginning of the _jspService() method This object is assigned to a variable named session If you do not need to retain objects between requests, you can turn off automatic session creation by specifying session="false" in the page directive Doing so can improve performance by reducing the number of objects of which the servlet engine has to keep track Because a session persists until it times out (typically 30 minutes later) or it is explicitly invalidated, the impact on performance can be considerable Table 7-5 outlines several useful methods in the session object

Object getAttribute(String name) Enumeration getAttributeNames() String getId()

Returns the object with the specified name, if it exists in the session Returns an enumeration of the names of all the objects stored in the session Returns the unique session ID This ID must be stored by the client (Web browser) between requests and passed back to the JSP container to identify which session is required

Table 7-5

7:

int getMaxInactiveInterval()

Returns the maximum number of seconds the session stays active between user requests The JSP container closes the session if no activity occurs over that length of time Closes the session and unbinds all its objects Stores an object in the session under the specified name

void invalidate() void setAttribute(String name, Object value) Table 7-5

Some Useful Methods of the session Object (continued)

Remember, the pageContext object can also be used to get and set attributes in the session in the same manner as the sessiongetAttribute() and sessionsetAttribute() methods

The application implicit object encapsulates a view of the collection of all servlets, JSP pages, HTML pages, and other resources in a Web application This object implements the javaxservletServletContext interface and is automatically constructed at the beginning of the _jspService() method It provides information about the server version, any application-wide initialization parameters, and the absolute paths of resources within the application This object also provides a means for logging messages Some of its more useful methods are described in Table 7-6

Enumeration getAttributeNames()

Returns an enumeration of the names of all objects stored in the servlet context Returns an object with the specified name that was stored with the application s setAttribute() method

Object getAttribute(String name)

Table 7-6

String getInitParameter(String name)

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