Response返回JSON数据到前台页面

转自博文：《Response JSON数据返回》http://blog.csdn.net/anialy/article/details/8665471

简述：

在servlet填充Response的时候，做JSON格式的数据转换

使用的类是net.sf.json.JSONObject，传入response对象和返回的显示类，修改response，返回前台JSON格式数据

代码：

/**
 * 以JSON格式输出
 * @param response
 */
protected void responseOutWithJson(HttpServletResponse response,
        Object responseObject) {
    //将实体对象转换为JSON Object转换
    JSONObject responseJSONObject = JSONObject.fromObject(responseObject);
    response.setCharacterEncoding("UTF-8");
    response.setContentType("application/json; charset=utf-8");
    PrintWriter out = null;
    try {
        out = response.getWriter();
        out.append(responseJSONObject.toString());
        logger.debug("返回是\n");
        logger.debug(responseJSONObject.toString());
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (out != null) {
            out.close();
        }
    }
}

例如：

　　try {
            HttpServletRequest request = ServletActionContext.getRequest();
            HttpServletResponse response = ServletActionContext.getResponse();
            String selectName = new String(request.getParameter("selectName").getBytes("iso-8859-1"),"utf-8");//用request获取URL传递的中文参数,防止乱码
            response.setCharacterEncoding("utf-8");
            PrintWriter out = response.getWriter();
            if (!selectName.equals("")) {            
                historyEvent = historyEventService.getHistoryEventByName(projectId, selectName);//获取对象
                response.setContentType("application/json; charset=utf-8");  
                JSONObject responseJSONObject = JSONObject.fromObject(historyEvent); //将实体对象转换为JSON Object转换  
                out.print(responseJSONObject.toString());
                out.flush();
                out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();

        }

    @ResponseBody
    @RequestMapping(value = "/xxxxxx", produces = "text/html;charset=UTF-8")
    public String xxxxx(ModelMap map, String orderNo, HttpServletRequest request, HttpServletResponse response)
    {
        MemberBasicVo memberBasicVo = SessionUtil.getDataFromSession(request,
                ServiceConstant.Member.SESSION_USER_LOGIN_INFO, MemberBasicVo.class);
        if (null == memberBasicVo)
        {
            return "redirect:/mall/memberLogin/toLogin.ihtml";
        }
        try
        {
            List goodsItemsList = goodsExchangeViewComponent.getItemsByOrderNo(orderNo,
                    memberBasicVo.getLoginName());
            String listData = JsonUtils.toJson(goodsItemsList);
            String jsonData = "{ \"listData\":" + listData + "}";
            response.getWriter().append(jsonData);
            return null;
        }
        catch (Exception e)
        {
            log.error(e.getMessage(), e);
            return "";
        }
    }