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📁 这是用java编写自定义标签的一些源码和笔记
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<a name="navskip"></a><td height="25" colspan="4"><img alt="5.正文标签" src="imagemaster/titlebar5.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>实现标签处理程序</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 3 页（共3 页）</nobr></font></td>
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<p>
						
<code>MapParseTag</code> 是一个 <code>map</code> 标签的标签处理程序。它根据传递给正文的字符串定义一个 map。在 <code>doAfterBody()</code> 方法中，<code>MapParseTag</code> 用 <code>body.getString()</code> 将正文内容抓取为字符串。然后用 <code>body.clearBody()</code> 清除正文内容。

 

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<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
  

 public class MapParseTag extends BodyTagSupport {

 

     private String id;    

     private Map map;

     

     public int doStartTag() throws JspException {

         map=new FastTreeMap();

         return EVAL_BODY_BUFFERED;

     }

 

     public int doAfterBody() throws JspException {

             /* Grab the body content */

         BodyContent body = this.getBodyContent();

         

         /* Get the body content as a String */

         String     content = body.getString();

         

         /* Clear the body */

         body.clearBody();

         

         /* Parse the map */

         int start = content.indexOf("{");

         int end = content.lastIndexOf("}");

         content = content.substring(start+1, end);

         

         /* Parse the entries in the map */

         StringTokenizer token = new StringTokenizer(content,"=;, \t\r\n");

         while(token.hasMoreTokens()){

             

             String key = token.nextToken();

             String value = token.nextToken();

                         map.put(key,value);

         }

         

         this.pageContext.setAttribute(id,map);

             return SKIP_BODY;

     }

 </code>
</pre>
<p>
  

 

 多简单！我们已经讨论了对其正文进行处理的标签，现在要详细讨论实现了执行流程的标签了。

 


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