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();
        }