求助 jsp 获取json格式数据 在线等
public String execute() throws Exception {
  HttpServletRequest request = ServletActionContext.getRequest();
  HttpServletResponse response = ServletActionContext.getResponse();
  response.setContentType("text/html;charset=UTF-8");
  response.setHeader("Cache-Control", "no-cache");
  ipImpl iI = new ipImpl();
  ipbean ipjb = new ipbean();
  String startDate = java.net.URLDecoder.decode(request.getParameter("startDate"), "UTF-8");
  String endDate = java.net.URLDecoder.decode(request.getParameter("endDate"), "UTF-8");
  List<ipbean> ipList = iI.queryIp(startDate, endDate);
  // request.setAttribute("ipList", ipList);
  Iterator<ipbean> itip = ipList.iterator();
  JSONArray ja = new JSONArray();
  while (itip.hasNext()) {
  ipjb = itip.next();
  JSONObject sign = new JSONObject();
  sign.put("id", ipjb.getId());
  sign.put("ip", ipjb.getStr_ip());
  sign.put("Date", ipjb.getStr_Date());
  ja.put(sign);
  }
  System.out.println(ja);
  return null;

  }


jsp页面上如何按表格格式显示获取到ja里的数据

------解决方案--------------------
你后台先response....print(ja);

前台JSP才可以得到JSON数据.
前台通过response.responseText 可以得到JSON 后面的处理自己看看如何读取JSON数据
------解决方案--------------------
接你的代码：
response.setContentType("text/plain;charset=utf-8");
PrintWriter responseStream = response.getWriter();
responseStream.println(jsonArray);

------解决方案--------------------

Java code

@RequestMapping("/topic/by_channel.do")
    public void topicsByChannel(Integer channelId, HttpServletResponse response)
            throws JSONException {
        JSONArray arr = new JSONArray();
        if (channelId != null) {
            List<CmsTopic> list = manager.getListByChannel(channelId);
            JSONObject o;
            for (CmsTopic t : list) {
                o = new JSONObject();
                o.put("id", t.getId());
                o.put("name", t.getName());
                arr.put(o);
            }
        }
        ResponseUtils.renderJson(response, arr.toString());
    }

------解决方案--------------------

Java code

/**
     * 发送json。使用UTF-8编码。
     * 
     * @param response
     *            HttpServletResponse
     * @param text
     *            发送的字符串
     */
    public static void renderJson(HttpServletResponse response, String text) {
        render(response, "application/json;charset=UTF-8", text);
    }