直接上示例：

字符串：

{"msg":{"absTime":1589882783000,"adminList":[],"alarmAddress":"沪亭南路姚北路北侧南向北1HG","alarmLevel":"1","alarmStatus":"0","alarmTime":1589882783000,"alarmType":"2","deviceId":"5d7c562f-f31b-4f25-a306-72358341ee63","ext":"[{\"birthday\":\"未知\",\"libId\":\"550\",\"nation\":\"未知\",\"sex\":\"0\",\"libName\":\"布控中心重点人员 - T3\",\"remark\":\"级联布控人员告警\",\"targetImage\":\"http://15.210.56.40:6120/pic?2ddf32i6c-e*292198143b8b--6df4b688b14e9i3b2*=9d5s5*=0dpi*=1d5i7t5pe*m5i7-=9906485zcd8s=8i01=\",\"extend\":\"{\\\"DealWith\\\":\\\"现场风洞道口任务，无需处置\\\",\\\"Reason\\\":\\\"支撑现场风洞道口任务\\\",\\\"Source\\\":\\\"刘迪冰\\\"}\",\"sceneImg\":\"http://15.209.59.111:8080/SJKKPIC_1400/CJ/20200519/31011710051321035012/310117100513210350120220200519180623269100.jpg\",\"score\":94,\"createTime\":\"2020-05-19 18:09:55\",\"idcard\":\"440922197305180614\",\"name\":\"刘关平\",\"personId\":\"310117100513210350120220200519180623396370663590\"}]","faceId":"310117100513210350120220200519180623396370663590","gbId":"31011710051321035012","id":"a376886d-90e7-47bd-92a9-9d87916ff5bc","idCard":"440922197305180614","imageUrl":"http://15.209.59.114:8080/SJKKPIC_1400/OTHER/20200519/31011710051321035012/310117100513210350120220200519180623269131.jpg","latitude":31.112101,"libId":"550","libName":"布控中心重点人员 - T3","loginId":"0ad29676-2e1d-40ca-b44a-ede03a1870","longitude":121.333601,"name":"刘关平","number":0,"realAlarm":-1,"recordId":"310117100513210350120220200519180623396370663590","score":94,"sex":"0","source":"vdt","status":"0","targetImage":"http://15.210.56.40:6120/pic?2ddf32i6c-e*292198143b8b--6df4b688b14e9i3b2*=9d5s5*=0dpi*=1d5i7t5pe*m5i7-=9906485zcd8s=8i01=","taskId":""},"systemMessage":"0","alarmId":"a376886d-90e7-47bd-92a9-9d87916ff5bc","type":"FACE_ALARM","userId":"b2d589d1-4b66-4d11-9960-103b98596d1a","gisMessage":"0"}

json格式(部分，展示不全)：

定义对应的实体类：

public classAlarmFeedBack {publicMsg msg;publicString systemMessage;publicString alarmId;publicString type;publicString userId;publicString gisMessage;

}public classMsg {public longabsTime;publicObject[] adminList;publicString alarmAddress;publicString alarmLevel;publicString alarmStatus;publicString alarmTime;publicString alarmType;publicString deviceId;public Listext;publicString faceId;publicString gbId;publicString id;publicString idCard;publicString imageUrl;public doublelatitude;publicString libId;publicString libName;publicString loginId;public doublelongitude;publicString name;publicInteger number;publicInteger realAlarm;publicString recordId;publicInteger score;publicString sex;publicString source;publicString status;publicString targetImage;publicString taskId;

}public classExt {publicString birthday;publicString libId;publicString nation;publicString sex;publicString libName;publicString remark;publicString targetImage;publicExtend extend;publicString sceneImg;publicInteger score;publicString createTime;publicString idcard;publicString name;publicString personId;

}public classExtend {

String DealWith;

String Reason;

String Source;

}

(重点在此)

解析方法：

/**

* 解析

* @param str

* @return*/

public staticAlarmFeedBack GetAlarmFeedBackFromStr(String str){

Map map= com.alibaba.fastjson.JSONObject.parseObject(str,Map.class);

Map map1= com.alibaba.fastjson.JSONObject.parseObject(JSONObject.toJSONString(map.get("msg")),Map.class);

String res=map1.get("ext");

AlarmFeedBack alarmFeedBack= JSONUtil.toBean(str,AlarmFeedBack.class);if(res!=null&&res.length()>0){

List maps=JSONObject.parseArray(res,Map.class);

String ss= maps.get(0).get("extend").toString();

Listexts=JSONUtil.toList(JSONUtil.parseArray(res),Ext.class);

alarmFeedBack.getMsg().setExt(exts);if(ss!=null&&ss.length()>0){

Extend extend=JSONUtil.toBean(ss,Extend.class);

alarmFeedBack.getMsg().getExt().get(0).setExtend(extend);

}

}returnalarmFeedBack;

}

测试调用：

String str="{\"msg\":{\"absTime\":1589882783000,\"adminList\":[],\"alarmAddress\":\"沪亭南路姚北路北侧南向北1HG\",\"alarmLevel\":\"1\",\"alarmStatus\":\"0\",\"alarmTime\":1589882783000,\"alarmType\":\"2\",\"deviceId\":\"5d7c562f-f31b-4f25-a306-72358341ee63\",\"ext\":\"[{\\\"birthday\\\":\\\"未知\\\",\\\"libId\\\":\\\"550\\\",\\\"nation\\\":\\\"未知\\\",\\\"sex\\\":\\\"0\\\",\\\"libName\\\":\\\"布控中心重点人员 - T3\\\",\\\"remark\\\":\\\"级联布控人员告警\\\",\\\"targetImage\\\":\\\"http://15.210.56.40:6120/pic?2ddf32i6c-e*292198143b8b--6df4b688b14e9i3b2*=9d5s5*=0dpi*=1d5i7t5pe*m5i7-=9906485zcd8s=8i01=\\\",\\\"extend\\\":\\\"{\\\\\\\"DealWith\\\\\\\":\\\\\\\"现场风洞道口任务，无需处置\\\\\\\",\\\\\\\"Reason\\\\\\\":\\\\\\\"支撑现场风洞道口任务\\\\\\\",\\\\\\\"Source\\\\\\\":\\\\\\\"刘迪冰\\\\\\\"}\\\",\\\"sceneImg\\\":\\\"http://15.209.59.111:8080/SJKKPIC_1400/CJ/20200519/31011710051321035012/310117100513210350120220200519180623269100.jpg\\\",\\\"score\\\":94,\\\"createTime\\\":\\\"2020-05-19 18:09:55\\\",\\\"idcard\\\":\\\"440922197305180614\\\",\\\"name\\\":\\\"刘关平\\\",\\\"personId\\\":\\\"310117100513210350120220200519180623396370663590\\\"}]\",\"faceId\":\"310117100513210350120220200519180623396370663590\",\"gbId\":\"31011710051321035012\",\"id\":\"a376886d-90e7-47bd-92a9-9d87916ff5bc\",\"idCard\":\"440922197305180614\",\"imageUrl\":\"http://15.209.59.114:8080/SJKKPIC_1400/OTHER/20200519/31011710051321035012/310117100513210350120220200519180623269131.jpg\",\"latitude\":31.112101,\"libId\":\"550\",\"libName\":\"布控中心重点人员 - T3\",\"loginId\":\"0ad29676-2e1d-40ca-b44a-ede03a187095\",\"type\":\"FACE_ALARM\",\"userId\":\"b2d589d1-4b66-4d11-9960-103b98596d1a\",\"gisMessage\":\"0\"}";

AlarmFeedBack res= ParsePoliceSit.GetAlarmFeedBackToStr(str);