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<DIV class=pt10><B>8.3.2.7 处理文档事件</B></DIV>
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<P>在"实现DocumentHandler接口"一节中，我们定义了五个文档事件处理方法的框架，现在，我们来实现框架中的实际内容，如下所示：</P>
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<TR>
<TD width="100%">public void startDocument ()<BR>throws SAXException
{<BR><STRONG>emit ("<?xml version= 1.0 encoding= gb2312
?>");<BR>nl();<BR></STRONG>}<BR><BR>public void endDocument
()<BR>throws SAXException {<BR><STRONG>try {<BR>
nl();<BR> out.flush ();<BR>} catch (IOException e) {<BR>
throw new SAXException ("I/O error", e); <BR>}
</STRONG><BR>}</TD></TR></TBODY></TABLE></CENTER></DIV>
<P>在上面代码中，当分析器遇到文档的起始部分时，就输出XML文档声明语句。当分析器分析到文档的结束时，简单地输出一个换行，并把输出流中的内容全部输出。就文档开始与结束而言，不需要再做其他的工作。而对于元素起始与结束，所做的工作如下面代码中的黑体部分所示：</P>
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<TABLE width="80%" border=1>
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<TR>
<TD width="100%">public void startElement (String name,
AttributeList attrs)<BR>throws SAXException {<BR><STRONG>emit
("<"+name);<BR>if (attrs != null) {<BR> for (int i = 0; i
< attrs.getLength (); i++) {<BR> emit ("
");<BR> emit (attrs.getName(i)+"=\""+attrs.getValue
(i)+"\"");<BR> }<BR>}<BR>emit
(">");</STRONG><BR>}<BR><BR>public void endElement (String
name)<BR>throws SAXException {<BR><STRONG>emit
("</"+name+">");</STRONG><BR>}</TD></TR></TBODY></TABLE></CENTER></DIV>
<P>通过上面的代码，可以输出所遇到的元素名称以及元素的所有属性。现在，只剩下XML文档中的文本内容没有输出了。下面代码则是characters方法的实现：</P>
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<TD width="100%">public void characters (char buf [], int offset,
int len)<BR>throws SAXException {<BR><STRONG>String s = new
String(buf, offset, len);<BR>emit
(s);</STRONG><BR>}</TD></TR></TBODY></TABLE></CENTER></DIV>
<P>到目前为止，我们已经写完了利用SAX分析器的一个应用程序Echo.java，接下来就是编译并执行该应用程序了。<BR></P></DIV>
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