例子二:通過Xalan 1.2,使用XSLT轉換XML
做為第二個例子,我們使用了Xalan-java的XSLT引擎,這個引擎來自于APACHE的XML項目,使用這個程序,我們能夠使用XSL轉換XML源文件。這將極大的方便我們處理文檔和進行內容管理。
開始之前,我們需要將xerces.jar 和 xalan.jar文件放入java.class.path目錄下(這兩個文件包含在Xalan-Java 1.2 中,可以從xml.apache.org處下載)。 PHP程序如下: 函數xslt_transform()以XML和XSL文件為參數,形式可為文件名(如:foo.xml)或URL(如:http://localhost/foo.xml)。
<?php
function xslt_transform($xml,$xsl) {
// Create a XSLTProcessorFactory object. XSLTProcessorfactory is a Java // class which manufactures the processor for performing transformations. $XSLTProcessorFactory = new java("org.apache.xalan.xslt.XSLTProcessorFactory");
// Use the XSLTProcessorFactory method getProcessor() to create a // new XSLTProcessor object. $XSLTProcessor = $XSLTProcessorFactory->getProcessor();
// Use XSLTInputSource objects to provide input to the XSLTProcessor // process() method for transformation. Create objects for both the // xml source as well as the XSL input source. Parameter of // XSLTInputSource is (in this case) a 'system identifier' (URI) which // can be an URL or filename. If the system identifier is an URL, it // must be fully resolved. $xmlID = new java("org.apache.xalan.xslt.XSLTInputSource", $xml); $stylesheetID = new java("org.apache.xalan.xslt.XSLTInputSource", $xsl);
// Create a stringWriter object for the output. $stringWriter = new java("java.io.StringWriter");
// Create a ResultTarget object for the output with the XSLTResultTarget // class. Parameter of XSLTResultTarget is (in this case) a 'character // stream', which is the stringWriter object. $resultTarget = new java("org.apache.xalan.xslt.XSLTResultTarget", $stringWriter);
// Process input with the XSLTProcessors' method process(). This // method uses the XSL stylesheet to transform the XML input, placing // the result in the result target. $XSLTProcessor->process($xmlID,$stylesheetID,$resultTarget);
// Use the stringWriters' method toString() to // return the buffer's current value as a string to get the // transformed result. $result = $stringWriter->toString(); $stringWriter->close(); return($result); }
?>
函數定義好后,我們就可以調用它了,在下面的例程中,變量$xml指向一個URL字符串,$xsl也是如此。這個例子將顯示5個最新的phpbuilder.com文章標題。
<?php
$xml = "http://www.phpbuilder.com/rss_feed.php?type=articles&limit=5"; $xsl = "http://www.soeterbroek.com/code/xml/rss_html.xsl"; $out = xslt_transform($xml,$xsl); echo $out;
?>
如果你在本地機上運行程序,必須確保你的函數參數指向正確的文件名。
<?php
$xml = "/web/htdocs/xml_java/rss_feed.xml"; $xsl = "/web/htdocs/xml_java/rss_html.xsl"; $out = xslt_transform($xml,$xsl); echo $out;
?>
雖然這種效果我們可以通過其它方法實現,或許那些方法更好,但這個例子能讓你對PHP調用JAVA類有一個更好的了解。
教程結束了,希望你能夠從這篇教程中學到點東西,以下是一些你用得到的鏈接: http://www.php4win.de ~ A great Win32 distribution of PHP http://www.javasoft.com ~ Sun's Java release http://www.jars.com ~ Start searching for handy Java classes http://www.gamelan.com ~ More Java classes http://www.technetcast.com/tnc_play_stream.html?stream_id=400 ~ Sam Ruby about PHP and Java integration at Open Source Convention 2000 (audio) http://xml.apache.org ~ Apache XML Project http://www.phpbuilder.com/columns/justin20001025.php3 ~ Transforming XML with XSL using Sablotron
|