Write a TAG involving three steps,
(1) Write JSP
(2) Write a java program for TAG
(3) Write a description file of the TAG library TLD (actually an XML file)
There is no order between these three steps, and below is a simple example:
1 Write hellotag.jsp
<% @ Page ContentType = "Text / HTML"%>
hello tags page </ title> </ head></p>
<p><body></p>
<p><% @ Taglib Uri = "/ Web-INF / CLASS / TAGS / HELLOTAG.TLD" prefix = "Hello"%></p>
<p><hello: hellotag /></p>
<p></ body></p>
<p></ html></p>
<p>2 Write TAG</p>
<p>Hellotag.java</p>
<p>Package tags; // Note: must be placed in a package</p>
<p>Import java.io. *;</p>
<p>Import javax.servlet.jsp. *;</p>
<p>Import javax.servlet.jsp.tagext. *;</p>
<p>Public class hellotag extends tagsupport {</p>
<p>Public int desarttag () {</p>
<p>Try {</p>
<p>// Get the output object of JSP using JSPWriter</p>
<p>Jspwriter jspwriteroutput = pageContext.getOut ();</p>
<p>JspwriterOutput.print ("Hello Tag!");</p>
<p>} Catch (ioexception oEx) {</p>
<p>System.out.println ("IOEXCEPTION in Hellotag" IOEX);</p>
<p>}</p>
<p>Return (SKIP_BODY);</p>
<p>}</p>
<p>}</p>
<p>3 Write hellotag.tld</p>
<p>This is the description of the Tag library:</p>
<p><? XML Version = "1.0" encoding = "UTF-8"?></p>
<p>DOCTYPE TAGLIB</p>
<p>PUBLIC "- // Sun microsystems, Inc.//dtd JSP Tag Library 1.2 // en"</p>
<p>"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd"></p>
<p><taglib></p>
<p><TLIB-VERSION> 1.0 </ Tlib-Version></p>
<p><JSP-VERSION> 1.2 </ jsp-version></p>
<p><Short-Name> HelloTag </ Short-Name></p>
<p><URI> / Web-Inftagshellotag </ URI></p>
<p><display-name> HelloTag </ display-name></p>
<p><Small-icon> </ small-icon></p>
<p><large-icon> </ large-icon></p>
<p><Description> Simple Hello Tags Tag</p>
<p></ description></p>
<p><tag></p>
<p><name> hellotag </ name></p>
<p><tag-class> tags.Hellotag </ tag-class></p>
<p><body-content> EMPTY </ body-content> <small-icon> </ small-icon></p>
<p><large-icon> </ large-icon></p>
<p><Description> </ description></p>
<p><eXample> </ example></p>
<p></ tag></p>
<p></ taglib></p>
<p>4 Note:</p>
<p>Usually manually write XML files, but Sun's tutorial recommends writing custom TAGs using IDE tools, such as NetBeans</p>
<p>Generally, put the TLD file directly in the web-inf directory.</p>
<p>references:</p>
<p>Http://java.sun.com/j2ee/1.4/docs/tutorial/doc/jspintro10.html</p></div><div class="text-center mt-3 text-grey">
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