servlet中如何向页面输出json信息呢？

实现思路:
    1.定义内容体的type为 application/json;charset=utf-8
	2.向response对象中写入待输出的字符串

	/**
	 * servlet中使用json格式输出信息
	 * @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();
			}
		}
	}