servlet post 发送，接收json

public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		
		//把请求参数转换成json的形式
		JSONObject params = new JSONObject();
		params.put("CarID", "集G5B777");
		params.put("InsuredID", "360426197712060044");
		
		String connectUrl="url";//呼叫中心url
       
		String strTimeOut = "3000";//3s
		URL url = null;
        BufferedReader reader = null;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        OutputStreamWriter writer = null;
        /**
         * HttpURLConnection的参数设置问题
         */
        HttpURLConnection connection = null;
        url = new URL(connectUrl);
        connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        connection.setAllowUserInteraction(true);
        if(strTimeOut!=null){
        	connection.setConnectTimeout(Integer.parseInt(strTimeOut));
        	connection.setReadTimeout(Integer.parseInt(strTimeOut));
        }
        connection.connect();//连接
        outputStream = connection.getOutputStream();
        writer = new OutputStreamWriter(outputStream);
        writer.write(params.toString());
        writer.flush();
        writer.close();//必须调用close方法，请求完毕
        /**
         * 读取返回的报文
         */
        inputStream = connection.getInputStream();
        reader = new BufferedReader(new InputStreamReader(inputStream));
        String strMessage = "";
        String strResponse = "";
        while ((strMessage = reader.readLine()) != null)
        {
        	strResponse += strMessage;
        }
        reader.close();
       System.out.println(strResponse);
       
       
       //接收
       public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 1. 接收数据
		StringBuilder strbu = null;
		String carID = null;
		String insuredID=null;
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));		
			strbu = new StringBuilder();
			String str = "";
			while ((str = reader.readLine()) != null) {
				strbu.append(str);
			}
		        //解析json
			JSONObject jsonObject = JSONObject.fromObject(strbu.toString());
			// 获取key 为CaseID 对应的值
			carID = jsonObject.getString("CarID");
			insuredID=jsonObject.getString("InsuredID");
			reader.close();
		} catch (Exception e) {
			e.printStackTrace();
		}