//Import the necessary classes
import java.io.*;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;

public class ProcessXSL extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    doPost(request, response);
  }

  public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

    String xmlURL = request.getParameter("xml");
    String xslURL = request.getParameter("xsl");
    PrintWriter out = response.getWriter();
    response.setContentType("text/html");
    try {
      // Create transformer factory
      TransformerFactory factory = TransformerFactory.newInstance();
      // Use the factory to create a template containing the xsl file
      Templates template = factory.newTemplates(new StreamSource(xslURL));
      // Use the template to create a transformer
      Transformer xformer = template.newTransformer();
      //Set xsl params
      Enumeration enum = request.getParameterNames();
      while (enum.hasMoreElements()) {
        String pname = (String) enum.nextElement();
        if (!(pname.equals("xml") || pname.equals("xsl"))) {
          String pvalue = request.getParameter(pname);
          xformer.setParameter(pname,pvalue);
        }
      }
      // Prepare the input and output files
      Source source = new StreamSource(xmlURL);
      Result result = new StreamResult(out);
      // Apply the xsl file to the source file and write the result to the output file
      xformer.transform(source, result);
    } catch (Exception e) {
        out.println(e.getMessage());
      } 
  }//End of doPost
}//End of class Definition