ajax請求的時候解決跨域問題，不用spring的responsBody

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

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

response.addHeader("expires", "0"); 

//解決跨域問題

response.setHeader("Access-Control-Allow-Origin", "*"); //這句代碼解決跨域問題。

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

response.setCharacterEncoding("UTF-8"); 

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

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

response.getWriter().flush();