json對象如何轉義為字符串

`
//實現請求參數類型均為string businessID、resultType、data的接口調用

	JSONObject contractRequesJson=new JSONObject();
	contractRequesJson.put("businessID","20200202");
	contractRequesJson.put("resultType","1");
	JSONObject dataJson=new JSONObject();
	dataJson.put("contractId","001");
	dataJson.put("contractType","AA");
	contractRequesJson.put("data",dataJson.toString());
	System.out.println("jsonObj-jsonObj"+contractRequesJson.toString());

	Map dataMap=new HashMap();
	dataMap.put("contractId","001");
	dataMap.put("contractType","AA");
	contractRequesJson.put("data",dataMap);
	System.out.println("jsonObj-map"+contractRequesJson.toString());

	Map contractRequestVo=new HashMap();
	contractRequestVo.put("businessID","20200202");
	contractRequestVo.put("resultType","1");
	contractRequestVo.put("data",dataJson.toString());
	System.out.println("map-jsonObject"+JSONObject.fromObject(contractRequestVo).toString());

	contractRequestVo.put("data",dataMap);
	System.out.println("map-map"+JSONObject.fromObject(contractRequestVo).toString());

`
請求參數打印：

JSONObject在外層嵌套map對象時，可以使jsonObject的對象轉義成string字符串（層層嵌套時，最外層為map對象即可）
調用接口示例：

參數為某一對象時，參數類型須一一對應，用post application/json請求時允許通過
因此當有類型為string而非json對象格式時須對請求參數進行轉義