jifnal 将string转换成json，并输出转换后的json

[遇见美好]

string str="{"message":{"macImeiImportList":[{"macno":"12666","imei":"861514453490932","sn":"12666/53490932","meid":"15144534909352","imeiError":false,"haveError":"Y","isTempImei":"Y"},{"macno":"12666","imei":"861514453491021","sn":"12666/53491021","meid":"15144534910223","imeiError":false,"haveError":"Y","isTempImei":"Y"}],"macname":"******************","macImportList":[{"macno":"12666","quantity":"2"}],"orgImport":"MI0101"},"status":"success"}"

System.out.println(result.toString());

JSONObject json = JSONObject.fromObject(result);
json.getString(json.toString());

为什么老是提示：
2017-12-28 17:31:29
[ERROR]-[Thread: qtp27138326-25]-[com.jfinal.core.ActionHandler.handle()]: /phoneinsur/addstore
net.sf.json.JSONException: JSONObject["{\"message\":{\"macImeiImportList\":[{\"macno\":\"12666\",\"imei\":\"861514453490932\",\"sn\":\"12666/53490932\",\"meid\":\"15144534909352\"。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
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