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Some Useful Methods of the response Object
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PageContext
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JSP code operates within a hierarchy of environments, as shown in Figure 7-2 A single HTTP request, for example, may be serviced by multiple JSP pages: one that produces heading information and another that generates detailed output Similarly, multiple HTTP requests may be part of a larger HTTP session that starts with a login request, proceeds through some user selection requests, and then commits the work to a database Finally, the set of all HTTP sessions in a servlet context may share a connection pool or other common objects Each of the layers in this hierarchy can have attributes that apply at that level only The JSP specification provides for a PageContext object that keeps track of attributes at four levels: I The JSP page I The HTTP request
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Figure 7-2
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I The HTTP session I The overall application A PageContext object is automatically initialized and assigned to a variable named pageContext at the beginning of the _jspService() method This object provides search and update capability for attributes at each of the four levels, as described in Table 7-4 It also provides methods that forward requests to other resources and include the output of other resources
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ELEMENTS OF JSP
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Object findAttribute(String name)
Description
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
Object getAttribute(String name, int scope)
void removeAttribute(String name, int scope) void setAttribute(String name, Object value, int scope)
Table 7-4
Some Useful Methods of the pageContext Object
JSP: The Complete Reference
Session
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
Method
Object getAttribute(String name) Enumeration getAttributeNames() String getId()
Description
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
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