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ELEMENTS OF JSP
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would record the remote address of the user making a Web request without cluttering the output If something goes wrong with the application, technical support personnel can instruct the user to view the generated HTML source and report the identifying data
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JSP provides a simple means for accessing the value of a Java variable or other expression and merging that value with the HTML in the page The syntax is <%= exp %> where exp is any valid Java expression The expression can have any data value, as long as it can be converted to a string This conversion is usually done simply by generating an outprint() statement For example, the JSP code
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The current time is <%= new javautilDate() %>
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may generate the servlet code
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outwrite("The current time is "); outprint( new javautilDate() ); outwrite("\r\n");
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Understanding what code is generated can help you remember not to put a semicolon inside an expression 7 discusses expressions in more detail
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Scriptlets
A scriptlet is a set of one or more Java language statements intended to be used to process an HTTP request The syntax of a scriptlet is <% statement; [statement; ] %> The JSP compiler simply includes the contents of scriptlet verbatim in the body of the _jspService() method A JSP page may contain any number of scriptlets If multiple scriptlets exist, they are each appended to the _jspService() method in the order in which they are coded This being the case, a scriptlet may contain an open curly brace that is closed in another scriptlet Consider the following JSP page, which produces a Fahrenheit to Celsius temperature conversion table:
<%@ page import="javatext*" %> <TABLE BORDER=0 CELLPADDING=3> <TR> <TH>Degrees<BR>Fahrenheit</TH> <TH>Degrees<BR>Celsius</TH> </TR> <% NumberFormat fmt = new DecimalFormat("###000"); for (int f = 32; f <= 212; f += 20) { double c = ((f - 32) * 5) / 90; String cs = fmtformat(c); %> <TR> <TD ALIGN="RIGHT"><%= f %></TD> <TD ALIGN="RIGHT"><%= cs %></TD> </TR> <% } %> </TABLE>
6:
JSP Syntax and Semantics
The example code contains two scriptlets: one for the main body of the loop and one for the closing curly brace Between the two scriptlets is the HTML markup for a single table row, using JSP expressions to access the values The generated servlet code converts the scriptlets and what is between them to
NumberFormat fmt = new DecimalFormat("###000"); for (int f = 32; f <= 212; f += 20) { double c = ((f - 32) * 5) / 90; String cs = fmtformat(c); outwrite("\r\n<TR>\r\n<TD ALIGN=\"RIGHT\">"); outprint( f ); outwrite("</TD>\r\n"); outwrite("\r\n<TD ALIGN=\"RIGHT\">"); outprint( cs ); outwrite("</TD>\r\n"); outwrite("</TR>\r\n"); }
ELEMENTS OF JSP
which produces the following output: Degrees Fahrenheit 32 52 72 92 112 132 152 172 192 212 Degrees Celsius 000 11111 22222 33333 44444 55556 66667 77778 88889 100000
Scriptlets are explored at length in 7
Declarations
Like scriptlets, declarations contain Java language statements, but with one big difference: scriptlet code becomes part of the _jspService() method, whereas declaration code is incorporated into the generated source file outside the _jspService() method The syntax of a declaration section is <%! statement; [statement; ] %>
JSP: The Complete Reference
Declaration sections can be used to declare class or instance variables, methods, or inner classes Unlike scriptlets, they have no access to the implicit objects described in the next section If you use a declaration section to declare a method that needs to use the request object, for example, you need to pass the object as a parameter to the method The following shows an example of a JSP page that uses a declaration section:
<%@ page errorPage="ErrorPagejsp" import="javaio*,javautil*" %> <% Enumeration enames; Map map; String title; // Print the request headers map = new TreeMap(); enames = requestgetHeaderNames(); while (enameshasMoreElements()) { String name = (String) enamesnextElement(); String value = requestgetHeader(name); mapput(name, value); } printTable(out, map, "Request Headers"); // Print the session attributes map = new TreeMap(); enames = sessiongetAttributeNames(); while (enameshasMoreElements()) { String name = (String) enamesnextElement(); String value = "" + sessiongetAttribute(name); mapput(name, value); } printTable(out, map, "Session Attributes"); %> <%-- Define a method to print a table --%>
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