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Declarations
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static { } public vardec2() { } public void _jspService( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { JspFactory _jspxFactory = null; PageContext pageContext = null; HttpSession session = null; ServletContext application = null; ServletConfig config = null; JspWriter out = null; Object page = this; String _value = null; try { _jspxFactory = JspFactorygetDefaultFactory(); responsesetContentType("text/html;charset=8859_1"); pageContext = _jspxFactorygetPageContext (this, request, response, "", true, 8192, true); application = pageContextgetServletContext(); config = pageContextgetServletConfig(); session = pageContextgetSession(); out = pageContextgetOut(); outwrite("\r\n"); count = 0; for (int i = 0; i < 10; i++) { outwrite("\r\nRequest "); outprint( IntegertoHexString(requesthashCode()) ); outwrite("\r\ncount = "); outprint( ++count ); outwrite("<BR>\r\n"); Threadsleep(250);
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ELEMENTS OF JSP
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} outwrite("\r\n"); } catch (Exception ex) { if (outgetBufferSize() != 0) outclearBuffer(); pageContexthandlePageException(ex); } finally { outflush(); _jspxFactoryreleasePageContext(pageContext); } } }
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The source of the problem is that count is an instance variable, not a local variable in the _jspService() method Recall that JSP pages are compiled as servlets, which, by default, run as a single instance with separate threads to handle each request This being the case, any instance variables are automatically shared between all request-handling threads In the example, the first request got as far as 3, but then the thread that handled the second request entered _jspService() and reset the shared count variable back to zero As the loop progressed, the two threads alternated every 125 milliseconds or so, each incrementing the value 14 discusses this problem and explores several solutions The conclusion presenting itself here is that variable declarations in a JSP page are best used to handle read-only variables
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A more common use for declarations is to define additional methods The syntax is no different than for any other method definitions, except for the <%! and %> delimiters:
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<%! public int sum(int a, int b) { return a + b; } %>
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Declarations
As with variable declarations, method definitions are copied verbatim into the generated servlet as top-level members outside the _jspService() method:
public class methdef1 extends HttpJspBase { // begin [file="methdef1jsp";from=(0,3);to=(5,0)] public int sum(int a, int b) { return a + b; } // end // public void _jspService( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // } }
ELEMENTS OF JSP
A typical method definition in a JSP declaration would be for a utility method that reformats strings produced by a scriptlet Consider the following JSP page that displays the value of several system properties in an HTML table:
<TABLE BORDER=1 CELLPADDING=3 CELLSPACING=0> <% String[] propNames = { "javaawtprinterjob", "javaclasspath", "javaclassversion", "javaextdirs", "javalibrarypath", }; for (int i = 0; i < propNameslength; i++) { String name = propNames[i]; String value = SystemgetProperty(name); %>
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<TR> <TD ALIGN=LEFT VALIGN=TOP><%= name %></TD> <TD ALIGN=LEFT VALIGN=TOP><%= value %></TD> </TR> <% } %> </TABLE>
The output of the JSP page is shown in Figure 8-4 The problem with this table is several of the values are quite long, with no embedded spaces This means the right-hand table cell is too long to be displayed in the window A simple solution for this is to shorten the property value strings One quality the offending members have in common is they consist of a list of several values separated by semicolons These can be shortened by inserting a <BR> tag after each semicolon, so the list will be displayed on multiple lines This will make the table width requirement no longer than the longest list entry This could be done with inline code in the scriptlet,
Figure 8-4
Table with Very Wide Cells
8:
Declarations
but a more readable solution would be to use a normalize() method that applies the necessary transformation That way, the <%= value %> expression could simply be written <%= normalize(value) %> The following shows the modified JSP page:
<TABLE BORDER=1 CELLPADDING=3 CELLSPACING=0> <% String[] propNames = { "javaawtprinterjob", "javaclasspath", "javaclassversion", "javaextdirs", "javalibrarypath", }; for (int i = 0; i < propNameslength; i++) { String name = propNames[i]; String value = SystemgetProperty(name); %> <TR> <TD ALIGN=LEFT VALIGN=TOP><%= name %></TD> <TD ALIGN=LEFT VALIGN=TOP><%= normalize(value) %></TD> </TR> <% } %> </TABLE> <%! private static final String normalize(String s) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < slength(); i++) { char c = scharAt(i); sbappend(c); if (c == ';') sbappend("<BR>"); } return sbtoString(); } %>
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