PHP & Java(3)

王朝php·作者佚名  2006-01-08
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Example 2: Using Xalan 1.2 to transform XML with XSLT

As another example of accessing Java objects in PHP, we will use the Xalan-java XSLT engine from the Apache XML project. With this application, we can transform XML source files using instructions in a XSL file. This allows for a great number of interesting scenarios in the field of document processing and content management.

To get started, we need to place both xerces.jar and xalan.jar files (included in Xalan-Java version 1.2 from xml.apache.org) in your java.class.path, as defined in your php.ini file.

The function xslt_transform() takes XML and XSL files as parameters and returns the transformed output in a string. XML and XSL parameters can be filenames (eg. foo.xml) or fully resolved URI's (eg. 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);

}

?>

Then, you can call this function as shown in the example below. $xml contains a string with the fully resolved URL of XML file. $xsl contains string with a XSL stylesheet URL containing rules for conversion to generic HTML. $out will contain a string with output, as a result of calling xslt_transform described above. This example parses a XML newsfeed containing the 5 latest articles on phpbuilder.com. You are encouraged to also try other XML feeds and/or XSl stylesheets.

<?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;

?>

If you are processing local files, make sure you use the full path name to pass to the Java class.

<?php

$xml = "/web/htdocs/xml_java/rss_feed.xml";

$xsl = "/web/htdocs/xml_java/rss_html.xsl";

$out = xslt_transform($xml,$xsl);

echo $out;

?>

Although there are a number of other ways in PHP to achieve the same results, the above example gives you a good idea of the possibilities of accessing Java objects in PHP.

 
 
 
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