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Expressions and Scriptlets
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session = pageContextgetSession(); out = pageContextgetOut(); // your code appears here } catch (Exception ex) { if (outgetBufferSize() != 0) outclearBuffer(); pageContexthandlePageException(ex); } finally { outflush(); _jspxFactoryreleasePageContext(pageContext); } }
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ELEMENTS OF JSP
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You can see a number of objects are created before the JSP author s code is added The meaning of these objects is the subject of the next section
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Implicit Objects and the JSP Environment
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The scriptlets and expressions written in a JSP page do not stand alone as a complete program they need an environment in which to operate The JSP container provides this environment and makes it accessible to the page author through what are called implicit objects These objects are created by container-generated statements at the beginning of the _jspService() method and are assigned predetermined names that are the same in all JSP pages Nine of these objects exist, as listed in Table 7-1
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The HttpServletRequest object that was passed to _jspService() The HttpServletResponse object that was passed to _jspService()
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Table 7-1
Implicit Objects Available Within Scriptlets and Expressions
JSP: The Complete Reference
Object
pageContext session application out config page exception Table 7-1
Description
A means of accessing page, request, session, or application attributes The current HttpSession object, if one exists The servlet context object The JspWriter response output stream object The servlet configuration object A reference to the current instance of the JSP class itself An uncaught exception (valid in error pages only)
Implicit Objects Available Within Scriptlets and Expressions (continued)
These variables can be accessed simply by using their predetermined names like any other variable One of these variables has already been used in the examples in this chapter the JspWriter out variable,
<% outprintln("<B>out</B> is an <I>"); outprintln(outgetClass()getName()); outprintln("</I> object"); %>
which produces the output when run under Tomcat: out is an orgapachejasperruntimeJspWriterImpl object This, of course, is vendor-specific JRun 30 produces out is an allairejrunjspJRunJspWriter object The JSP implicit objects provide the context in which an HTTP request is serviced The following sections consider each of these objects in detail
Request
The request variable contains a reference to the HttpServletRequest object passed in the first parameter of the generated _jspService() method This object
7:
Expressions and Scriptlets
encapsulates the details of the HTTP request generated by the Web browser or other client its parameters, attributes, headers, and data Some of its more useful methods3 are listed in Table 7-2
Response
The response variable provides access to the other side of the HTTP transaction This object encapsulates the output returned to the HTTP client, providing the page auth or with a means for setting response headers and the status code It also has methods for accessing the response output stream, but the JSP specification prohibits directly accessing this stream All JSP response output must be written using the out implicit variable Methods provided by the HttpServletResponse object include those listed in Table 7-3
ELEMENTS OF JSP
Method
String getHeader(String name)
Description
Returns the value of the specified HTTP header, or null if the header is not present in the request Returns an enumeration of all HTTP headers present in the request Given the name of a single-valued form parameter, returns its value Returns an enumeration of the names of all form parameters passed to this request Returns the current HttpSession object If one does not exist, either creates a new one or returns null, depending on the create flag
Enumeration getHeaderNames() String getParameter(String name) Enumeration getParameterNames()
HttpSession getSession(boolean create)
Table 7-2
Some Useful Methods of the request Object
3 A complete description of javaxservlethttpHttpServletRequest and all other classes in the Servlet 22 API can be found in Appendix A
JSP: The Complete Reference
Method
boolean isCommitted()
Description
Returns a flag indicating whether the HTTP response has already been returned to the client Sets an HTTP header with the specified name and value Sets the HTTP status to the specified value
void setHeader(String name, String value) void setStatus(int sc)
Table 7-3
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