Informatica Powercenter:如何在XML文档上运行XSLT转换

Question

我有一个复杂的XML文档,信息XML解析器正在努力"规范化",如何在将其发送到XML解析器之前运行XML转换(如XSLT)来简化它.

Answer 1

一种方法是使用标准Java转换并使用标准javax.xml.transform API来执行转换.

为此,请向您的流添加Java转换

在Import Packages窗格中,导入所需的Java包

import java.io.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;

在Helper Code窗格中我们构造了一个变换器对象.据我所知,每个实例都创建了非静态字段,因此不存在并发问题.(评论？)

private final Transformer transformer = getNewTransformer();

public Transformer getNewTransformer()
{ 
  // /opt/informatica/infadev/DataTransformation
  final String IFCMPath = System.getenv("IFCONTENTMASTER_HOME"); 
  final String xslt = IFCMPath + "/ServiceDB/xst/mytransform.xslt";
  logInfo("Using XSLT File" + xslt);
  try{
   return TransformerFactory.newInstance().newTransformer(new StreamSource(xslt));
  } catch(TransformerConfigurationException ex) {
    logError("Could not create TransformerFactory with xslt " + xslt );

  }
  return null;
}

最后,我们通过对变换器对象执行transform方法对传入的xml文档执行转换.

if( transformer == null ) {
    failSession("Transformer was null");
}

//final long startTime = System.nanoTime();
//final long endTime;

try {
    //logInfo("Recieved xml with size " + xmlin.length() );
    // logInfo("Recieved xml " + xmlin );
    final StringReader reader = new StringReader(xmlin);
    final StringWriter writer = new StringWriter();

    transformer.transform(new StreamSource(reader),new StreamResult(writer));
    xmlout = writer.toString();
   // logInfo("xmlout  " + xmlout  );
} catch (Exception e) {
     incrementErrorCount(1);
     logError(e.getMessage());
     logError(xmlin);
} 

//finally { 
//  endTime = System.nanoTime(); 
//} 

//final long duration = endTime - startTime; 
//logInfo("Duration  " + duration / 1000000000.0 );