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<DIV class=pt10><B>9.3.8 XML Servlet軟件包</B></DIV>
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<P align=left>XML Servlet是由Cerium Component Software Incorporated
開發(fā)的一組商業(yè)軟件，它可以通過JDBC訪問關(guān)系數(shù)據(jù)庫在應(yīng)用系統(tǒng)和數(shù)據(jù)庫之間進(jìn)行基于XML的雙向數(shù)據(jù)交換。下圖展示了XML
Servlet的體系結(jié)構(gòu)。</P>
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<P align=left>XML Servlet 實際上是一種Java
Servlet，它使用XML指令將XML模板、HTML模板同數(shù)據(jù)庫相結(jié)合，利用XML Servlet顯示和更新數(shù)據(jù)庫中的數(shù)據(jù)。XML
Servlet的開發(fā)模式沿襲了三層架構(gòu)模式，通過將XML
Servlet放置于中間層的Web服務(wù)器，使得XML的應(yīng)用開發(fā)相對獨立于前端的用戶界面（瀏覽器）和后端的數(shù)據(jù)庫設(shè)計，進(jìn)一步提高了開發(fā)效率。 </P>
<P align=left>XML Servlet
不是孤立的軟件，與之相配套的還有兩個工具軟件：XMLOutline和XMLDB。XMLOutline采用層次化大綱形式的文本編輯器，利用它可以創(chuàng)建DTD和XML文檔。XMLDB可以動態(tài)地將DTD和XML文檔相結(jié)合，進(jìn)而產(chǎn)生用于將XML文檔數(shù)據(jù)存儲與數(shù)據(jù)庫中所需的SQL語句，包括可能的主鍵和外鍵。<BR><BR>相關(guān)網(wǎng)址：<A
href="http://ceriumworks.com/">http://ceriumworks.com/</A><BR></P></DIV>
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