@Controller@RequestMapping("/json")public class JsonController {	@RequestMapping("/first")	public ModelAndView Json() {		ModelAndView mav = new ModelAndView();		MappingJacksonJsonView view = new MappingJacksonJsonView();		Map attribute = new HashMap();		attribute.put("success", Boolean.TRUE);		attribute.put("contractNo", "contractNo");		view.setAttributesMap(attribute);		mav.setView(view);		return mav;	}}