Few days ago I was working on some application, and needed to update some values in my JSP using Ajax. I decided to use XML as an Ajax response, parse it and do whatever I want with it...
In this post I will show you how to make Struts2 return XML as an Ajax response.
Here is an example of how you can do this:
public class CustomAction extends ActionSupport
{
public HttpServletResponse getResponse()
{
return ServletActionContext.getResponse();
}
@Override
public String execute() throws Exception {
PrintWriter printWriter = null;
getResponse().setContentType("text / xml;charset = UTF-8");
getResponse().setHeader("Cache - Control", "no - cache");
StringBuffer sb = new StringBuffer("");
// let's say you have A Movie object "movie" that needs to be represented as XML
try
{
printWriter = getResponse().getWriter();
sb.append("" + movie.getDirector() + " ");
sb.append("" + movie.getLanguage() + " ");
sb.append("" + movie.getYear() + " ");
sb.append(" ");
printWriter.print(sb.toString());
}
catch (IOException e)
{
e.printStackTrace();
throw e;
}
finally
{
printWriter.close();
printWriter = null;
}
return NONE;
}
}
And that's it! Just create a PrintWriter, adjust some values in response and print your XML.
And now, in your JavaScript, you can parse this xml and do something with it:
directors=xmlhttp.responseXML.documentElement.getElementsByTagName("director");
languages=xmlhttp.responseXML.documentElement.getElementsByTagName("language");
years = xmlhttp.responseXML.documentElement.getElementsByTagName("year");
director = directors[0].firstChild.nodeValue;
language = languages[0].firstChild.nodeValue;
year = years[0].firstChild.nodeValue;
document.getElementById('director').value=director;
document.getElementById('language').value=language;
document.getElementById('year').value=year;
That's it.
I hope I helped someone...
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