private void sendJSONP(HttpServletResponse resp,CharSequence json,String jsonp) {
		resp.setContentType(JSON_CONTENT_TYPE);
		PrintWriter writer = null;
		try {
			writer = resp.getWriter();
			writer.write(jsonp + "(" + json.toString() + ")");
			log.debug("response output:" + json);
		} catch (IOException e) {
			log.error("export JSON 出错：" + e.getMessage());
			if (log.isDebugEnabled()) {
				log.debug("",e);
			}
			throw new RuntimeException(e.getMessage(),e);
		} finally {
			if (writer != null) {
				writer.flush();
				writer.close();
			}
		}
	}

		this.sendJSONP(resp,JsonUtils.Map2json(returnMap),request.getParameter("callback"));