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<DIV class=pt10><B>8.3.2.2 引入需要的类</B></DIV>
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<P>应用程序中将用到下面几个类包，需要在程序开始对其进行引入：</P>
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<TD width="100%"><STRONG>import java.io.*;<BR>import
org.xml.sax.*;<BR>import javax.xml.parsers.SAXParserFactory;
<BR>import javax.xml.parsers.ParserConfigurationException;<BR>import
javax.xml.parsers.SAXParser;<BR></STRONG><BR>public class Echo
extends HandlerBase{ <BR>...</TD></TR></TBODY></TABLE></CENTER></DIV>
<P>在这几个类包中，java.io中的类是用于输出的；org.xml.sax包中定义了SAX分析器中用到的所有接口；SAXParserFactory类用来创建所需要的分析器实例；如果SAXParserFactory不能按照配置选项创建合适的分析器，该类就会产生一个ParserConfigurationException异常；最后SAXParser是类工厂创建的分析器实例。<BR></P></DIV>
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