IBM Version 5 manual Modifying the showPage method, Example 11-10 showPage method

Modifying the doPost method

Now we need to modify the doPost method. All we need to do is invoke the doQuery method with HttpServletRequest. We are reusing same form with registration, we need to add another button to query. We define the button as queryBtn, and check in the doPost method. If queryBtn is pressed, doPost proceeds to doQuery and shows. Once the doQuery succeeds, go showpage to show results. If it fail, go back to the input form which will be reproduced by doGet method. The doGet method reuses the XML Document that is currently instantiated in the servlet instance, and the membership field has been replaced with -1, which is the Membership already existed message.

Example 11-9 CustomerXSLServlet doPost method for query

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

{

if( request.getParameter("queryBtn") != null ){ showPage(resultStylesheet, response, doQuery(request));

}else{

if( doRegister(request) == true){ showPage(resultStylesheet, response, doQuery(request));

}else{

doGet(request, response);

}

} }

Modifying the showPage method

The showPage method takes an output document as the third parameter. The parameter is org.w3c.dom.Document type, so to run under Application Developer 4.0.3, you need to use following statement:

transformer.transform(new StreamSource(

new StringReader(resultdata)), new StreamResult(writer));

Example 11-10 showPage method

private void showPage(Templates stylesheet, HttpServletResponse response, org.w3c.dom.Document doc)

throws IOException

{

try

{

Transformer transformer = stylesheet.newTransformer(); response.setContentType("text/html");

PrintWriter writer = response.getWriter();

transformer.transform(new DOMSource(doc), new StreamResult(writer));

Chapter 11. Light weight XML-based Enterprise Application 273