[Reserved] Chemicals your first TAG in JSP

xiaoxiao2021-03-06  129

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"> 转载请注明原文地址:https://www.9cbs.com/read-98226.html</div><div class="plugin d-flex justify-content-center mt-3"></div><hr><div class="row"><div class="col-lg-12 text-muted mt-2"><i class="icon-tags mr-2"></i><span class="badge border border-secondary mr-2"><h2 class="h6 mb-0 small"><a class="text-secondary" href="tag-2.html">9cbs</a></h2></span></div></div></div></div><div class="card card-postlist border-white shadow"><div class="card-body"><div class="card-title"><div class="d-flex justify-content-between"><div><b>New Post</b>(<span class="posts">0</span>) </div><div></div></div></div><ul class="postlist list-unstyled"> </ul></div></div><div class="d-none threadlist"><input type="checkbox" name="modtid" value="98226" checked /></div></div></div></div></div><footer class="text-muted small bg-dark py-4 mt-3" id="footer"><div class="container"><div class="row"><div class="col">CopyRight © 2020 All Rights Reserved </div><div class="col text-right">Processed: <b>0.048</b>, SQL: <b>9</b></div></div></div></footer><script src="./lang/en-us/lang.js?2.2.0"></script><script src="view/js/jquery.min.js?2.2.0"></script><script src="view/js/popper.min.js?2.2.0"></script><script src="view/js/bootstrap.min.js?2.2.0"></script><script src="view/js/xiuno.js?2.2.0"></script><script src="view/js/bootstrap-plugin.js?2.2.0"></script><script src="view/js/async.min.js?2.2.0"></script><script src="view/js/form.js?2.2.0"></script><script> var debug = DEBUG = 0; var url_rewrite_on = 1; var url_path = './'; var forumarr = {"1":"Tech"}; var fid = 1; var uid = 0; var gid = 0; xn.options.water_image_url = 'view/img/water-small.png'; </script><script src="view/js/wellcms.js?2.2.0"></script><a class="scroll-to-top rounded" href="javascript:void(0);"><i class="icon-angle-up"></i></a><a class="scroll-to-bottom rounded" href="javascript:void(0);" style="display: inline;"><i class="icon-angle-down"></i></a></body></html><script> var forum_url = 'list-1.html'; var safe_token = 'VwYbJ_2B2nJ3TDD4At8MLDXQ15iCBozVsto7DU1EKwKE1dA9pYZlcuJQGAhrNQmY0o0fHZqhYJXg4PhocXFtumlQ_3D_3D'; var body = $('body'); body.on('submit', '#form', function() { var jthis = $(this); var jsubmit = jthis.find('#submit'); jthis.reset(); jsubmit.button('loading'); var postdata = jthis.serializeObject(); $.xpost(jthis.attr('action'), postdata, function(code, message) { if(code == 0) { location.reload(); } else { $.alert(message); jsubmit.button('reset'); } }); return false; }); function resize_image() { var jmessagelist = $('div.message'); var first_width = jmessagelist.width(); jmessagelist.each(function() { var jdiv = $(this); var maxwidth = jdiv.attr('isfirst') ? 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