Hi Rob,
Here's an example of an XSLTC servlet using TrAX that
may help you figure things out.
Tom
> import javax.servlet.*;
> import javax.servlet.http.*;
> import java.io.*;
> import java.util.Enumeration;
> import java.net.URL;
>
> import org.xml.sax.*;
> import javax.xml.transform.TransformerFactory;
> import javax.xml.transform.TransformerConfigurationException;
> import javax.xml.transform.Templates;
> import javax.xml.transform.Transformer;
> import javax.xml.transform.Source;
> import javax.xml.transform.stream.StreamSource;
> import javax.xml.transform.stream.StreamResult;
>
> public final class XSLTCTraxServlet extends HttpServlet {
>
> private static Templates templates = null;
> private static TransformerFactory tFactory = null;
>
> public void init(ServletConfig config) throws ServletException {
>
> super.init(config);
>
> System.setProperty("javax.xml.transform.TransformerFactory",
> "org.apache.xalan.xsltc.trax.TransformerFactoryImpl");
>
> tFactory = TransformerFactory.newInstance();
> String xsl = "search.xsl";
> Source xslSource = null;
>
> try {
> System.out.println("in the try");
> // Get the stylesheet.
> if (xsl != null && xsl.length()> 0)
> xslSource = new StreamSource(xsl);
> if (xslSource != null) { // Now do we have a stylesheet?
> // if yes, create template for reuse
> System.out.println("xslSource is " + xslSource);
> System.out.println("tFactory is " + tFactory);
> templates = tFactory.newTemplates(xslSource);
> System.out.println("template is " + templates);
> }
> else {
> System.out.println("No Stylesheet!");
> }
> }
> catch (TransformerConfigurationException e) {
> System.out.println("can't make templates, " + e.getMessage());
> e.printStackTrace(System.err);
> }
> catch (Exception e) {
> e.printStackTrace(System.out);
> }
> } //end of init
>
>
> public void doPost (HttpServletRequest request,
> HttpServletResponse response)
> throws ServletException, IOException {
>
> // The servlet returns HTML; charset is UTF8.
> // See ApplyXSLT.getContentType() to get output properties from <xsl:output>.
> response.setContentType("text/html; charset=UTF-8");
> PrintWriter out = response.getWriter();
> Source xmlSource = null;
> String xml = "http://glrr.east:8080/calendar/calendar.xml";;
> try {
> if (xml != null && xml.length()> 0) {
> xmlSource = new StreamSource(new URL(xml).openStream());
> }
> else {
> out.write("No XML Input Document!");
> }
> long start = System.currentTimeMillis();
> Transformer transformer = null;
> System.out.println("in doPost, templates is " + templates);
> transformer = templates.newTransformer();
> setParameters(transformer, request); // Set stylesheet params.
> // Perform the transformation.
> transformer.transform(xmlSource, new StreamResult(out));
> long stop = System.currentTimeMillis();
> out.println("<!-- transformed in "+
> (stop-start)+"ms -->");
> }
> catch (Exception e) {
> e.printStackTrace(out);
> }
> out.close();
> } // end of doPost
>
> // Get parameters from the request URL.
> String getRequestParam(HttpServletRequest request, String param) {
> if (request != null) {
> String paramVal = request.getParameter(param);
> return paramVal;
> }
> return null;
> }
>
> // Set stylesheet parameters from the request URL.
> void setParameters(Transformer transformer, HttpServletRequest request) {
> Enumeration paramNames = request.getParameterNames();
> while (paramNames.hasMoreElements()) {
> String name = (String) paramNames.nextElement();
> String other;
> try {
> String value = request.getParameter(name);
> if (!(name.equals("style") || name.equals("source") ||
>name.equals("action") || name.equals("class"))) {
> if(name.equals("states")){
> value = "";
> String [] values = request.getParameterValues("states");
> value = values[0];
> for (int i = 1; i < values.length; i++){
> value = value + " " + values[i];
> }
> } else {
> value = request.getParameter(name);
> } // set country to ocountry so stylesheet only deals with country
> if(name.equals("country") && value.equals("Other")){
> other = request.getParameter("ocountry");
> value = new String(other);
> }
> if(name.equals("town") && (value.length() < 2)){
> value = new String("");
> }
> if(name.equals("zip") && (value.length() < 2)){
> value = new String("");
> }
> if(name.equals("ldist") && (value != null)){
> String lval = request.getParameter("ldist");
> String ulval = request.getParameter("lunits");
> double ldistance = Double.parseDouble(lval) *
>Double.parseDouble(ulval);
> value = new String(Double.toString(ldistance));
> }
> if(name.equals("gdist") && (value != null)){
> String gval = request.getParameter("gdist");
> String ugval = request.getParameter("gunits");
> double ldistance = Double.parseDouble(gval) *
>Double.parseDouble(ugval);
> value = new String(Double.toString(ldistance));
> }
> if(value != null && value.length() >= 1){
> transformer.setParameter(name, value);
> }
> }// end of if not style, source, action or class
> }
>
> catch (Exception e) { }
>
> }
> }
> }
