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<HTML><HEAD><TITLE>XML中國論壇 - 初學進階 - 8.3.2.7 處理文檔事件</TITLE>
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<DIV class=pt10><B>8.3.2.7 處理文檔事件</B></DIV>
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<P>在"實現DocumentHandler接口"一節中，我們定義了五個文檔事件處理方法的框架，現在，我們來實現框架中的實際內容，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>在上面代碼中，當分析器遇到文檔的起始部分時，就輸出XML文檔聲明語句。當分析器分析到文檔的結束時，簡單地輸出一個換行，并把輸出流中的內容全部輸出。就文檔開始與結束而言，不需要再做其他的工作。而對于元素起始與結束，所做的工作如下面代碼中的黑體部分所示：</P>
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<CENTER>
<TABLE width="80%" border=1>
<TBODY>
<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>通過上面的代碼，可以輸出所遇到的元素名稱以及元素的所有屬性。現在，只剩下XML文檔中的文本內容沒有輸出了。下面代碼則是characters方法的實現：</P>
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<TABLE width="80%" border=1>
<TBODY>
<TR>
<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>到目前為止，我們已經寫完了利用SAX分析器的一個應用程序Echo.java，接下來就是編譯并執行該應用程序了。<BR></P></DIV>
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