ZHTML中虽然默认内置了常用的流程控制和页面控件的标签，但也可以通过扩展机制来增加新的自定义标签。下面以自定义一个语法加亮的标签为例来说明自定义标签的流程。

1.  写一个JAVA类继承自AbstractTag，如下所示：

package com.zving.example; import java.util.ArrayList; import java.util.List; import com.zving.framework.data.DataTypes; import com.zving.framework.template.AbstractTag; import com.zving.framework.template.TagAttr; import com.zving.framework.utility.StringFormat; /** * @author 王育春 * @mail wyuch@zving.com * @date 2014-1-27 */ public class HotwordTag extends AbstractTag { private String word; private String link; @Override public String getName() { return "热词加链接标签"; } @Override public String getDescription() { return "将标签体内的指定词汇加上链接"; } @Override public String getPluginID() { return ExamplePlugin.ID; } @Override public String getPrefix() { return "c"; } @Override public String getTagName() { return "hotword"; } /** * 返回支持的标签属性列表 */ @Override public List<TagAttr> getTagAttrs() { ArrayList<TagAttr> attrs = new ArrayList<TagAttr>(); attrs.add(new TagAttr("word", true, DataTypes.STRING, "要加链接的词汇")); attrs.add(new TagAttr("link", true, DataTypes.STRING, "要链接的URL")); return attrs; } /** * 将标签体内的所有指定词汇加上链接，并标成红色 */ public int doAfterBody() { String body = this.getBody(); if (word != null && link != null) { body = body.replace(word, StringFormat.format("<a style='color:red' data-cke-saved-href='?' href='?'>?</a>", link, word)); } this.getPreviousOut().write(body); return AbstractTag.EVAL_PAGE; } public String getWord() { return word; } public void setWord(String word) { this.word = word; } public String getLink() { return link; } public void setLink(String link) { this.link = link; } }

　　关键点在于doAfterBody()方法，这个方法在标签的内容体执行完毕后获取执行的结果然后替换其中的字符串。

2. 将这个类作为一个扩展项注册到com.zving.framework.ui.zhtml.ZhtmlTagService，如下图所示：

3. 编写一个zhtml页面，如下所示：

　　Tag Test:<br> <c:hotword word="the" link=""> However, a fairytale ending for for one of the skaters could be thwarted by the aptly-named Gracie Gold, the 18-year-old American who will be skating in her first Games. Gold wowed fans with her victory in the U.S. National Figure Skating Championship last month. </c:hotword>