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spring MVC 使用注解返回json

使用spring MVC框架时,如何使用注解返回json呢?

@ResponseBody
	@RequestMapping(value = "/login")
	public ModelAndView ajaxLogin(Model model,User user,HttpServletRequest request, HttpSession session){
		String errorMessage=loginCommon(model, user, request, session);
		Map map=new HashMap();
		if(ValueWidget.isNullOrEmpty(errorMessage)){
			map.put(Constant2.AJAX_LOGIN_RESULT, "success");
		}else{
			map.put(Constant2.AJAX_LOGIN_RESULT, "failed");
		}
		map.put("error", errorMessage);
		model.addAttribute("user", null);
		return new ModelAndView(new MappingJacksonJsonView(),map);
	}

 注意:使用如下方式也可以把内容添加到json中

model.addAttribute("user", user1);

 运行结果:
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