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JSP: The Complete Reference
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The doEndTag() method can return either EVAL_PAGE or SKIP_PAGE The effect of each becomes clear when we see that SKIP_PAGE simply causes a return from the _jspService() method After printing the intervening HTML, the servlet begins work on the second tag:
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GetWebServerHeaderTag tag2 = (GetWebServerHeaderTag) JRunJSPStaticHelperscreateTagHandler (pageContext, "GetWebServerHeaderTag"); tag2setPageContext(pageContext); tag2setParent(null); tag2setName("allow"); tag2doStartTag();
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The only difference between the handling of this tag and the previous one results because the getWebServerHeader tag has a name attribute This is transformed into a call to the tag handler s setName() method just before doStartTag() is called The end tag is handled the same, with its return code determining whether to exit from the _jspService() method or continue
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Defining Tag Attributes
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A custom tag can have any number of attributes, which are name/value pairs coded in the start tag when it s used in a JSP page For example, the tag shown in the following
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<opera:role name="Papageno" range="baritone" description="a bird-catcher"/>
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has three attributes: name, range, and description Attributes may be required or optional, and their values can be coded as string literals or supplied at request time using JSP expressions (if the tag allows this) For each attribute a tag supports, its tag handler must supply two things: I An instance variable to store the attribute I One or more setAttrname() methods, where Attrname is the attribute name with the first letter capitalized For the previous example tag, the tag handler might look like this:
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/** * RoleTag
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JSP Tag Extensions
*/ public class RoleTag extends TagSupport { // Three attributes: private String name; private String range; private String description; ELEMENTS OF JSP // and their setter methods: public void setName(String nameFromJSPTag) { name = nameFromJSPTag; } public void setRange(String rangeFromJSPTag) { range = rangeFromJSPTag; } public void setDescription(String descriptionFromJSPTag) { description = descriptionFromJSPTag; } public int doStartTag() throws JspException { try { JspWriter out = pageContextgetOut(); outprintln("<TR>"); outprintln("<TD>" + name + "</TD>"); outprintln("<TD>" + range + "</TD>"); outprintln("<TD>" + description + "</TD>"); outprintln("</TR>"); } catch (IOException e) { throw new JspException(egetMessage()); } return SKIP_BODY; } }
JSP: The Complete Reference
The JSP container generates code in the JSP servlet to take attribute values coded in a custom tag and sends them to the tag handler It does this by calling the setAttrname() methods for each attribute This is done after the page context and parent tag have been set, but just before doStartTag() has been called For example, if a JSP page uses the <opera:role> tag as follows
<%@ page session="false" %> <%@ taglib prefix="opera" uri="/WEB-INF/tlds/operatld" %> <HTML> <HEAD><TITLE>The Magic Flute</TITLE></HEAD> <BODY> <H2>The Magic Flute</H2> <H3>Dramatis Personae</H3> <TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0"> <TR><TH>Role</TH><TH>Range</TH><TH>Description</TH> <opera:role name="Tamino" range="Tenor" description="an Egyptian prince"/> <opera:role name="Pamina" range="Soprano" description="daughter of the Queen of the Night"/> <opera:role name="Papageno" range="Baritone" description="a bird-catcher"/> <opera:role name="Queen of the Night" range="Soprano" description="die Sternflammende K nigin"/> <opera:role name="Sarastro" range="Bass" description="High Priest of Isis and Osiris"/> </TABLE> </BODY> </HTML>
then the generated servlet (again using JRun as the container) would handle each of the <opera:role> tags with code similar to the following:
RoleTag roleTag = (RoleTag) JRunJSPStaticHelperscreateTagHandler (pageContext, "RoleTag");
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JSP Tag Extensions
roleTagsetPageContext(pageContext); roleTagsetParent(null); roleTagsetRange("Baritone"); roleTagsetName("Papageno"); roleTagsetDescription("a bird-catcher"); roleTagdoStartTag(); ELEMENTS OF JSP
The property setter method is all that s required for a tag to support an attribute, but more information can be specified in the TLD In the <tag> element, there can be any number of <attribute> elements in the following form:
<attribute> <name>attributeName</name> <required>true|false</required> <rtexprvalue>true|false</rtexprvalue> </attribute>
Only the attribute name is required; the other two elements are optional and default to false If <required>true</required> is specified, then the attribute must be coded everywhere the tag is used or a fatal translation error will occur Otherwise, the attribute is optional The tag handler should take care to handle the case where the attribute hasn t been specified, in which case the instance variable will be null If <rtexprvalue>true</rtexprvalue> is specified, then the attribute value may be specified with a request time expression Attributes coded in this manner have the form
attribute="<%= scriptlet_expression %>"
where the quotes may include nothing but the JSP expression In addition to making it possible to supply a value for the attribute at run time, this also causes the type of the expression to be preserved In other words,
date="<%= new javautilDate() %>"
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