java怎么把字符串转成json字符串

@RequestMapping(value = "updateInvestorApplyAccountNo", method = RequestMethod.POST)
@ResponseBody
public void updateInvestorApplyAccountNo(HttpServletRequest request,
HttpServletResponse response,
@RequestBody String requestBody) {
int num = 0;
String result = "";

//下面是把拿到的json字符串转成 json对象
JSONObject jsStr = JSONObject.parseObject(requestBody); //将字符串{“id”：1}
//int jsID = Integer.parseInt(jsStr.getString("id"));//获取id的值

/**
* json对象转换成java对象
*/
InvestorApplyModel stud = (InvestorApplyModel) JSONObject.toJavaObject(jsStr,InvestorApplyModel.class);
}

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