json转义字符串

@RequestMapping("/addUserJson")
public void addUserJson(User user,HttpServletRequest request, HttpServletResponse response){		
　　String result = "{\"userName\":\" "+ user.getUserName()+" \", \"age\":\" "+ user.getAge()+" \"}";
　　PrintWriter out = null;
　　response.setContentType("application/json");
　　try {
　　	out=response.getWriter();
	out.write(result);
　　} catch (IOException e) {
　　// TODO Auto-generated catch block
　　　　e.printStackTrace();
　　}
}