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<DIV class=pt10><B>8.3.2.4 实现DocumentHandler接口</B></DIV>
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<P>DocumentHandler接口是我们要用到的一个最重要的JAXP接口，在该接口中，需要一系列的方法，这些方法是SAX分析器在对XML文档进行分析时遇到不同的分析事件所激发的相应处理。目前，主要用到五个方法：startDocument，endDocument，startElement，endElement，以及characters，下面黑体部分所标注的代码就是用来响应这五种事件处理的：</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>当分析器遇到一个起始标记或者一个结束标记时，标记名就作为一个字符串变量传递给方法startElement和endElement。另外，当遇到起始标记时，起始标记所代表的元素的所有的属性都以AttributeList的形式传递给startElement方法。在一个元素内的字符以一个字符数组的形式传递给characters方法，在characters方法中还有另外两个参数，其中一个代表字符数组的长度，也即字符的个数，另一个参数代表元素内的第一个字符在字符数组中的偏移。</P>
<P>对于下面所示的XML文档：</P>
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<TABLE width="80%" border=1>
<TBODY>
<TR>
<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>当对它利用SAX分析器中的DocumentHandler接口中的方法进行分析时，方法的调用时序如图所示：</P><FONT face=宋体
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