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<DIV class=pt10><B>8.3.2.2 引入需要的類</B></DIV>
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<P>應用程序中將用到下面幾個類包，需要在程序開始對其進行引入：</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>在這幾個類包中，java.io中的類是用于輸出的；org.xml.sax包中定義了SAX分析器中用到的所有接口；SAXParserFactory類用來創建所需要的分析器實例；如果SAXParserFactory不能按照配置選項創建合適的分析器，該類就會產生一個ParserConfigurationException異常；最后SAXParser是類工廠創建的分析器實例。<BR></P></DIV>
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