ajax跨域问题

在java代码的方法里面增加响应头：

@RequestMapping(value="getCode.html")
 @ResponseBody
 public List<Map<Object,Object>> getCode(ServletRequest request, ServletResponse resp) throws IOException, ServletException{
  HttpServletResponse response = (HttpServletResponse) resp;
  response.setHeader("Access-Control-Allow-Origin", "*");
  response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");