通过JSON的方式后台数据返回到前端

1.Controller

    /**
     * 查询
     * @param request
     * @param response
     * @return
     */
    @RequestMapping(value = {"/select"}, method= RequestMethod.POST)
    @ResponseBody
    public String selec(HttpServletRequest request, HttpServletResponse response, ModelMap model) {
        Map resultMap = new HashMap();
        try {
            String code= "0";
            String codes = "0";
            resultMap.put("code",2);
            resultMap.put("codes",5);
            JSONObject json = JSONObject.fromObject(resultMap);
            write(json.toString(), response);
        } catch (MyException e) {
            e.printStackTrace();
        }
        return null;
    }

2.write

	/**
     *
     * @Title: write
     * @Description: 在response中输出指定的内容  ContentType为text/html;charset=UTF-8
     * @param @param str
     * @param @param response
     * @return void  返回类型
     * @throws
     * @author
     */
    protected  void write(String str, HttpServletResponse response) {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setContentType("text/html;charset=UTF-8");
            response.getWriter().write(str!=null?str:"");
            response.getWriter().flush();
            response.getWriter().close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }