ajax请求的时候解决跨域问题，不用spring的responsBody

response.addHeader("pragma", "no-cache"); 

response.addHeader("cache-control", "no-cache,must-revalidate"); 

response.addHeader("expires", "0"); 

//解决跨域问题

response.setHeader("Access-Control-Allow-Origin", "*"); //这句代码解决跨域问题。

response.setContentType("text/html;charset=UTF-8"); 

response.setCharacterEncoding("UTF-8"); 

response.setDateHeader("Expires", 0L); 

response.getWriter().write(JSONObject.toJSONString(ms)); 

response.getWriter().flush();