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pageContextsetAttribute("userID", userID);
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Corresponding getAttribute() methods exist for retrieving the object Why bother storing objects in the page context with page scope when they are already accessible simply as Java variables The main context for this is JSP custom tags, which use the page context to communicate between tag handlers and the JSP page See 11 for details about JSP custom tags Request scope is almost the same as page scope, but it includes other JSP pages or servlets invoked by <jsp:include> or <jsp:forward> Attributes can be set in the request directly
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requestsetAttribute("userID", userID);
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The effect of the two method calls is identical; the pageContextsetAttribute() method simply calls requestsetAttribute() Request scope is appropriate for objects associated with a single request, possibly set in a servlet and used in a JSP page to which a RequestDispatcher forwards the request Session scope is used by multiple requests that identify themselves with the same session ID and are associated with an active HttpSession with that ID Attributes can be set in the session object directly
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pageContextsetAttribute ("userID", userID, PageContextSESSION_SCOPE);
Session scope is appropriate when all three of the following requirements are present: I The application requires multiple HTTP requests I Data needs to persist between requests I One or more server-side objects must persist in a particular state across requests As considered in this chapter, alternatives like hidden fields, URL rewriting, and cookies exist when HTTP sessions aren t required Application scope is the common namespace for all servlets and JSP pages in a Web application It persists between requests automatically, no session is required Static initialization parameters can be set in application scope by using <context-param> in the webxml deployment descriptor:
<context-param> <param-name>jdbcdriver</param-name> <param-value>sunjdbcodbcJdbcOdbcDriver</param-value> </context-param> <context-param> <param-name>jdbcurl</param-name> <param-value>jdbc:odbc:composers</param-value> </context-param>
These static parameters can be retrieved in a servlet or JSP page with the servlet context getInitParameter() method:
14:
Session and Thread Management
String driver = applicationgetInitParameter("jdbcdriver"); String url = applicationgetInitParameter("jdbcurl");
Objects can be stored in and retrieved from application scope with the same methods as the other three scopes
pageContextsetAttribute ("userID", userID, PageContextAPPLICATION_SCOPE);
applicationsetAttribute("userID", userID);
Application scope is most useful for objects that need to persist between requests, for objects that must be visible to all users of the application, or for objects that need to be shared between other servlets and JSP pages
JSP IN ACTION
Summary
The Web application model doesn t automatically map into the HTTP protocol HTTP is stateless, not remembering anything about the client from one request to the next The Web browser environment also introduces complications in an application, each page depends on its predecessors, but a user may browse pages out of order and leave an application without signaling she is done The solution to the problem is to have the client (browser) remember certain details and remind the server each time it makes a request This can involve the client managing all the data but, in practice, it s more common to see the client remember only an identifier of some kind and have the server use that to retrieve the rest of the data from a database This virtual conversation (virtual because no persistent connection is involved) is commonly called a session This chapter deals with four techniques for session management: I Hidden fields in HTML forms These are simple to use, but can only be transmitted with an HTML form If the user clicks a hyperlink, the hidden fields (and, therefore, the session) are lost I URL rewriting This involves appending the session identifier to all URLs generated by the JSP page Performance-wise, this technique can be expensive I Cookies Small named data elements are sent to the client and returned to the server when the page is revisited Cookies have the advantage that they can persist for an arbitrary length of time, even after the client computer is turned off The disadvantage is some users turn off cookie support because of concerns for privacy
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