[网络协议]Json、String的互相转换，及通过http传输数据转换

//String 转化为JSON对象
JSONObject jsonObject = JSONObject.parseObject(data);
//JSON对象转化为Json 字符串
paramMap.put("bookingRule",bookingRule.toJSONString());

案例：将数据进行封装，并通过http发起跳转

//封转数据
public boolean saveHospital(String data) {
        JSONObject jsonObject = JSONObject.parseObject(data);

        Map<String, Object> paramMap = new HashMap<>();
        paramMap.put("hoscode",this.getHoscode());
        paramMap.put("hosname",jsonObject.getString("hosname"));
        paramMap.put("hostype",jsonObject.getString("hostype"));
        paramMap.put("provinceCode",jsonObject.getString("provinceCode"));
        paramMap.put("cityCode", jsonObject.getString("cityCode"));
        paramMap.put("districtCode",jsonObject.getString("districtCode"));
        paramMap.put("address",jsonObject.getString("address"));
        paramMap.put("intro",jsonObject.getString("intro"));
        paramMap.put("route",jsonObject.getString("route"));
        //图片
        paramMap.put("logoData", jsonObject.getString("logoData"));

        JSONObject bookingRule = jsonObject.getJSONObject("bookingRule");
        paramMap.put("bookingRule",bookingRule.toJSONString());

        paramMap.put("timestamp", HttpRequestHelper.getTimestamp());
        paramMap.put("sign", MD5.encrypt(this.getSignKey()));

        JSONObject respone =
                HttpRequestHelper.sendRequest(paramMap,this.getApiUrl()+"/api/hosp/saveHospital");
        System.out.println(respone.toJSONString());

        if(null != respone && 200 == respone.getIntValue("code")) {
            return true;
        } else {
            throw new YyghException(respone.getString("message"), 201);
        }
    }

   /**
     * 封装同步请求
     * @param paramMap
     * @param url
     * @return
     */
    public static JSONObject sendRequest(Map<String, Object> paramMap, String url){
        String result = "";
        try {
            //封装post参数
            StringBuilder postdata = new StringBuilder();
            for (Map.Entry<String, Object> param : paramMap.entrySet()) {
                postdata.append(param.getKey()).append("=")
                        .append(param.getValue()).append("&");
            }
            log.info(String.format("--> 发送请求：post data %1s", postdata));
            byte[] reqData = postdata.toString().getBytes("utf-8");
            byte[] respdata = HttpUtil.doPost(url,reqData);
            result = new String(respdata);
            log.info(String.format("--> 应答结果：result data %1s", result));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return JSONObject.parseObject(result);
    }
	/**
	 * post 方式发送http请求.
	 * 
	 * @param strUrl
	 * @param reqData
	 * @return
	 */
	public static byte[] doPost(String strUrl, byte[] reqData) {
		return send(strUrl, POST, reqData);
	}
	/**
	 * @param strUrl
	 * @param reqmethod
	 * @param reqData
	 * @return
	 */
	public static byte[] send(String strUrl, String reqmethod, byte[] reqData) {
		try {
			URL url = new URL(strUrl);
			HttpURLConnection httpcon = (HttpURLConnection) url.openConnection();
			httpcon.setDoOutput(true);
			httpcon.setDoInput(true);
			httpcon.setUseCaches(false);
			httpcon.setInstanceFollowRedirects(true);
			httpcon.setConnectTimeout(CONN_TIMEOUT);
			httpcon.setReadTimeout(READ_TIMEOUT);
			httpcon.setRequestMethod(reqmethod);
			httpcon.connect();
			if (reqmethod.equalsIgnoreCase(POST)) {
				OutputStream os = httpcon.getOutputStream();
				os.write(reqData);
				os.flush();
				os.close();
			}
			BufferedReader in = new BufferedReader(new InputStreamReader(httpcon.getInputStream(),"utf-8"));
			String inputLine;
			StringBuilder bankXmlBuffer = new StringBuilder();
			while ((inputLine = in.readLine()) != null) {  
			    bankXmlBuffer.append(inputLine);  
			}  
			in.close();  
			httpcon.disconnect();
			return bankXmlBuffer.toString().getBytes();
		} catch (Exception ex) {
			log.error(ex.toString(), ex);
			return null;
		}
	}

?

    //上传医院接口
    @PostMapping("saveHospital")
    public Result saveHosp(HttpServletRequest request) {
        //获取传递过来医院信息
        Map<String, String[]> requestMap = request.getParameterMap();
        Map<String, Object> paramMap = HttpRequestHelper.switchMap(requestMap);

        //1 获取医院系统传递过来的签名,签名进行MD5加密
        String hospSign = (String)paramMap.get("sign");

        //2 根据传递过来医院编码，查询数据库，查询签名
        String hoscode = (String)paramMap.get("hoscode");
        String signKey = hospitalSetService.getSignKey(hoscode);

        //3 把数据库查询签名进行MD5加密
        String signKeyMd5 = MD5.encrypt(signKey);

        //4 判断签名是否一致
        if(!hospSign.equals(signKeyMd5)) {
            throw new YyghException(ResultCodeEnum.SIGN_ERROR);
        }

        //传输过程中“+”转换为了“ ”，因此我们要转换回来
        String logoData = (String)paramMap.get("logoData");
        logoData = logoData.replaceAll(" ","+");
        paramMap.put("logoData",logoData);

        //调用service的方法
        hospitalService.save(paramMap);
        return Result.ok();
    }

    /**
     *
     * @param paramMap
     * @return
     */
    public static Map<String, Object> switchMap(Map<String, String[]> paramMap) {
        Map<String, Object> resultMap = new HashMap<>();
        for (Map.Entry<String, String[]> param : paramMap.entrySet()) {
            resultMap.put(param.getKey(), param.getValue()[0]);
        }
        return resultMap;
    }

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