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JSP: The Complete Reference
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<TR> <TD><%= code %></TD> <TD><%= desc %></TD> </TR> <% } // Close the database objects rsclose(); stmtclose(); %> </TABLE> </BODY> </HTML>
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Notice the JSP does not need to define the Connection object The JSP is a protected variable of the superclass and, therefore, accessible to its subclasses
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import
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The import attribute is used to describe the fully qualified names of classes used in the JSP page This makes it possible for the classes to be referred to by their classes names without the package prefix This is an optional attribute The value of an import attribute is a comma-separated list of package names (each terminated with the wildcard string "*") and/or fully qualified class names These names are converted directly to import statements in the generated Java servlet The syntax is fairly flexible To import all classes in the javaio, javasql, and javautil packages, for example, you can use any of the following,
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<%@ page import="javaio*,javasql*,javautil*" %>
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or on individual lines (because newlines count as whitespace inside the string),
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<%@ page import=" javaio*, javasql*, javautil* "%>
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The Page Directive
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or using separate page directives:
<%@ page import="javaio*" %> <%@ page import="javasql*" %> <%@ page import="javautil*" %>
All these generate the same Java code, apart from differences in whitespace:
import javaio*; import javasql*; import javautil*;
ELEMENTS OF JSP
Note, importing classes does not involve loading anything; it is simply a shorthand way of letting you use class names inside your Java methods without having to specify the package to which they belong If you import javautil*, you can write
Vector names = new Vector();
instead of
javautilVector names = new javautilVector();
which affects only the Java compiler, not the run-time class image You can import thousands of classes, but only those you actually refer to will be required at run time The default import list consists of four packages: I javalang I javaxservlet I javaxservlethttp I javaxservletjsp You do not need to supply an import statement for classes in these packages; you also do not need to qualify them with their package names Remember, import is the only attribute of the page directive that can be specified more than once
JSP: The Complete Reference
session
The session attribute of the page directive indicates whether the page requires an HTTP session Two values are possible: I session="true" if the page needs an HTTP session This is the default value I session="false" if no HTTP session is required If this is specified, the session implicit variable is undefined and will cause a translation error if used If your JSP page does not required a session, it is valuable from a performance standpoint to specify session="false", so unnecessary sessions will not be created, using up memory and CPU cycles 14 describes HTTP sessions and session management in detail
buffer and autoFlush
The buffer and autoFlush attributes are used to describe the output buffering model the JSP will employ The buffer attribute can have the value "none", indicating all output will be written directly to the servlet response object s output stream, or it can have a integer value with a kb suffix In the latter case, output is stored in memory in a buffer of the specified size Depending on whether autoFlush is true or false , when the buffer is full, either the output will be flushed or a buffer overflow exception will be thrown The default buffer size is 8kb Table 10-3 summarizes the results of each combination of values for the two attributes:
Buffer
none
AutoFlush
true
Effect
Characters are written to the servlet response output stream as soon as they are generated An illegal combination autoFlush="false" is meaningless if buffering is not in effect
none
false
Table 10-3
Effects of Each Combination of Buffer and AutoFlush
10:
The Page Directive
Buffer
AutoFlush
true
Effect
An 8,192-byte buffer is used When this buffer is filled, it is automatically flushed This is the default value An 8,192-byte buffer is used When this buffer is filled, an exception is thrown A size times 1,024-byte buffer is used When this buffer is filled, it is automatically flushed A size times 1,024-byte buffer is used When this buffer is filled, an exception is thrown
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