Use XSLT to convert XML2XML

In EDI (Electronic Data Exchange) systems, this is often the case that the XML document defined in the system is in a format, the external system is defined in another format, or the formats of different external systems are not the same. For example, if a person is defined as <employee> in some places, other organizations use <worker> or <associate>. ① At this time, we need to convert XML into XML format.

XSLT stands out. XSLT is (EXtensibleSTylesheetLAnguage extended style sheet language) is a language that converts XML into other formats. For more information, see XSLT documents on the Internet.

If you use Java, you are lucky. Java provides a set of APIs that support XSLT usage. You can easily perform conversion without using third-party libraries. For conversion, you only need to prepare the source file (converted XML), the conversion template (XSLT file), and a piece of Java code.

Example:

Source file:

<?xml version="1.0" encoding="UTF-8"?><discussionForumHome><messageBoard id="1" name="Java Programming"/><messageBoard id="2" name="XML Programming"/><messageBoard id="3" name="XSLT Questions"/></discussionForumHome>

Template:

<?xml version="1.0" encoding="UTF-8"?><xsl:stylesheetversion="1.0"xmlns:xsl="http://www.w3.org/1999/XSL/Transform"><xsl:output method="html"/><!-- match the document root --><xsl:template match="/">
Java code
import java.io.File;import java.io.IOException;import java.net.URISyntaxException;import javax.xml.transform.Source;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.stream.StreamResult;import javax.xml.transform.stream.StreamSource;public class TestMain {    public static void main(String[] args) throws IOException, URISyntaxException, TransformerException {        TransformerFactory factory = TransformerFactory.newInstance();        Source xslt = new StreamSource(new File("D:\\dev\\learn\\discussionForumHome.xslt"));        Transformer transformer = factory.newTransformer(xslt);        Source text = new StreamSource(new File("D:\\dev\\learn\\discussionForumHome.xml"));        transformer.transform(text, new StreamResult(new File("D:\\dev\\learn\\output.xml")));    }}
TIP 1. The output file name is incorrect.
If you directly use StreamResult for file output, the file name will change to % ASCII format, for example

Transformer. transform (text, new StreamResult (new File ("D: \ dev \ learn \ puppy. xml ")));
The output file name is:

 

 
  
% E5 % B0 % 8F % E7 % 8B % 97.xml

 
Tracking the code of StreamResult at this time, we found that StreamResult uses the file ASCII In the constructor as the SystemID.

 

 
  
SetSystemId (f. toURI (). toASCIIString ());

 
In this case, you can set OutputStream.
StreamResult sr = new StreamResult (); sr. setOutputStream (new FileOutputStream (new File ("D: \ dev \ learn \ puppy. xml "); transformer. transform (text, sr );
 
Note ①. The example is taken from Java and XSLT, and the content of XML files is the same.