How to return JSON/XML using MultiActionController?

[eros]

here's the MultiActionController

public class SimulationController extends MultiActionController {

	private SimulationService simulationService;

	/**
	 * @param simulationService the simulationService to set
	 */
	@Autowired
	public void setSimulationService(SimulationService simulationService) {
		this.simulationService = simulationService;
	}
	
	public ModelAndView changeSimulationMode(HttpServletRequest request, HttpServletResponse response) 
		throws Exception {
		
		Object objMode = request.getParameter("mode"); 
		String strMode = (String) objMode;
		
		SimulationMode simulationMode = new SimulationMode();
		simulationMode.setSimulationMode(strMode);
		
		simulationService.execChangeSimulationMode(simulationMode);
		
        String json = "";
        try {
        	
        	json = "{" +
					   "\"success\":true" +
					"}";

        } catch (Exception e) {
            response.setHeader("Errored", "true");
            response.setHeader("ErrorType", "system");
            response.setHeader("ErrorMessage", e.getMessage());
            json = "{success:false,errors:{reason:'error'}}";
        }
        
        response.setContentType("text/json; charset=utf-8");
        response.setHeader("Cache-Control", "no-cache");
        PrintWriter pw = response.getWriter();
        pw.write(json);
        pw.close();
        return null;
	}
	
}

Successfully called the changeSimulationMode method but when it returns to browser... it will popup a download dialog to download the JSON content... like when downloading a file..

I've heard that Spring MVC 2.5.6 and SWF2.0.8 provides JSON and XML view..

Could you guide me on how to implement the above..
thanks

[shivarajan]

set content type to make the response "browser aware" and it should be fine!

[eros]

I am setting the content type already,... that's why it looks strange...

[shivarajan]

check the response using livehttpdheader firefox plugin. my guess is the response type is still not d right one!

note that ur are setting content type in response obj like,
response.setContentType("text/json; charset=utf-8");

rather try setting it in json obj since json's obj new constructor sets ct to default "app/json"

also try somethin like JsonView jv = new JsonView();

[rohan.chandane]

another way -

1. In MultiActionController you will have getJSON() which will return JSON string

public ModelAndView getJSON(HttpServletRequest request, HttpServletResponse response) throws Exception {
		// following service return JSON string
		String readContentString = contentService.readContent();
		return new ModelAndView("ContentJsonPage","contentJson", readContentString);
		
	}

2. In contentJSONPage.jsp

<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<c:out value="${contentJson}" escapeXml="false"></c:out>

This way it will return JSON

[ashishkulkarni]

A simple response.setContentType("text/html"); does the trick.

Best Regards,

Ashish.