java 将 json字符串 返回到调用页面成为json

@MethodResourceDesc(name = "[data]某种产品的行情列表")
	@RequestMapping(value = "/data/realtimeQuoteListMarket.do")
	@ResponseBody
	public void realtimeQuoteListMarket(
			HttpServletRequest request,HttpServletResponse response) throws IOException{
		int quoteType = RequestHelper.getQueryFieldsInt(request, "quoteType");
		String contractCode = RequestHelper.getQueryFields(request, "code");
		final String url = "http://IP:10001/data/imsQuote/IndexNoKey.do?contractCode="+contractCode+"&quoteType="+quoteType;
		String strRet = HttpUtils.doGet(url);
		response.setContentType("text/xml;charset=UTF-8");
		OutputStream os = response.getOutputStream();
		if(!"".equals(strRet) && strRet != null){
			os.write(strRet.getBytes());
			os.flush();
			os.close();
		}else{
			JSONObject json = new JSONObject();
			json.put("code", -1);
			json.put("success", false);
			json.put("message", null);
			os.write(json.toString().getBytes());
			os.flush();
			os.close();
		}
	}

/**
	 * 获取页面代码
	 *
	 * @param url
	 * @return
	 */
	public static String doGet(String url) {

		HttpClientParams params = new HttpClientParams();
		params.setParameter("name", "name");
		String response = null;

		HttpClient client = new HttpClient();
		HttpMethod method = new GetMethod(url);
		client.setParams(params);

		HttpConnectionManagerParams managerParams = client.getHttpConnectionManager().getParams();
		// 设置连接超时时间(单位毫秒)
		managerParams.setConnectionTimeout(15000);
		// 设置读数据超时时间(单位毫秒)
		managerParams.setSoTimeout(15000);

		try {
			client.executeMethod(method);
			// if (method.getStatusCode() == HttpStatus.SC_OK) {
//			response = method.getResponseBodyAsString();
			// }
			InputStream resStream = method.getResponseBodyAsStream();
			BufferedReader br = new BufferedReader(new InputStreamReader(resStream));
			StringBuffer resBuffer = new StringBuffer();
			String resTemp = "";
			while((resTemp = br.readLine()) != null){
	           resBuffer.append(resTemp);
			}
			response = resBuffer.toString();
		}
		catch (URIException e) {
			logger.info(e.getMessage(), e);
			return null;
		}
		catch (IOException e) {
			logger.info(e.getMessage(), e);
		}
		finally {
			method.releaseConnection();
		}
		return response;
	}

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