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<DIV class=pt10><B>8.3.2.4 實現DocumentHandler接口</B></DIV>
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<P>DocumentHandler接口是我們要用到的一個最重要的JAXP接口，在該接口中，需要一系列的方法，這些方法是SAX分析器在對XML文檔進行分析時遇到不同的分析事件所激發的相應處理。目前，主要用到五個方法：startDocument，endDocument，startElement，endElement，以及characters，下面黑體部分所標注的代碼就是用來響應這五種事件處理的：</P>
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<TD width="100%">...<BR>static private Writer out;<BR><STRONG>public
void startDocument ()<BR>throws SAXException { }<BR>public void
endDocument ()<BR>throws SAXException { }<BR>public void
startElement (String name, AttributeList attrs)<BR>throws
SAXException { }<BR>public void endElement (String name)<BR>throws
SAXException { }<BR>public void characters (char buf [], int offset,
int len)<BR>throws SAXException {
}</STRONG><BR>...</TD></TR></TBODY></TABLE></CENTER></DIV>
<P>當分析器遇到一個起始標記或者一個結束標記時，標記名就作為一個字符串變量傳遞給方法startElement和endElement。另外，當遇到起始標記時，起始標記所代表的元素的所有的屬性都以AttributeList的形式傳遞給startElement方法。在一個元素內的字符以一個字符數組的形式傳遞給characters方法，在characters方法中還有另外兩個參數，其中一個代表字符數組的長度，也即字符的個數，另一個參數代表元素內的第一個字符在字符數組中的偏移。</P>
<P>對于下面所示的XML文檔：</P>
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<TD width="100%"><?xml version =
"1.0"?><BR><addressbook><BR><person><BR>
<lastname>Idris</lastname><BR>
<firstname>Nazmul</firstname><BR>
<company>The Bean Factory, LLC.</company><BR>
<email>xml@beanfactory.com</email><BR></person><BR></addressbook></TD></TR></TBODY></TABLE></CENTER></DIV>
<P>當對它利用SAX分析器中的DocumentHandler接口中的方法進行分析時，方法的調用時序如圖所示：</P><FONT face=宋體
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