我想获取json里的basicsPolicy的值 请问 我这个json数据里怎么拿

{
  "requestBody": {
    "newApplyNo": "E3100C02109000100000388",
    "policy": {
      "appliClient": [
        {
          "birthday": 983894400000,
          "contactPhone": "",
          "email": "fgf@qq.com",
          "faxNumber": "XXXXXXXXXFW",
          "identifyNumber": "110101200103078833",
          "identifyType": "01",
          "insuredAddress": "",
          "insuredEName": "",
          "insuredName": "周军",
          "insuredType": "1",
          "mobile": "13800138000",
          "serialNo": 1,
          "sex": "1"
        }
      ],
      "coverage": {
        "itemList": [
          {
            "goodsCode": "LXSBCYLBX",
            "goodsName": "留学生补充医疗保险（美国版）",
            "insuredCount": 1,
            "insuredIdvList": [
              {
                "age": 20,
                "amount": 100000,
                "applyDate": 1623945600000,
                "basicsPolicy": {
                  "basicsPolicyCompany": "基础保单承保公司",
                  "basicsPolicyEndDate": 1658505599000,
                  "basicsPolicyNo": "基础保单保单号码",
                  "basicsPolicyStartDate": 1626969600000,
                  "graduateYear": "2023",
                  "insuredIdvChatNo": "WWWWWWWW",
                  "insuredSchool": "就读学校",
                  "linkerChatNo": "",
                  "linkerRelation": "",
                  "linkeridentifyNumber": ""
                },
                "beneficiary": [],
                "benefitOrder": "",
                "birthday": 983894400000,
                "contactPhone": "",
                "country": "",
                "email": "15000000034@163.com",
                "endDate": 1658419200000,
                "identifyNumber": "110101200103072258",
                "identifyType": "51",
                "insuredAddress": "",
                "insuredEName": "",
                "insuredFlag": "1",
                "insuredName": "周小军",
                "insuredType": "1",
                "itemNo": 1,
                "linkerName": "",
                "linkerPhone": "",
                "mainInsuredFlag": "1",
                "mobile": "15000000034",
                "occupationCode": "A01001",
                "occupationGrade": "A",
                "occupationLevel": "1",
                "occupationType": "A01",
                "planCode": "LXSBCYLBX",
                "planName": "留学生补充医疗保险（美国版）",
                "relationToAppnt": "03",
                "secondIdNum": "",
                "secondIdType": "",
                "serialNo": 1,
                "sex": "",
                "socialSecurityFlag": "",
                "startDate": 1626969600000
              }
            ],
            "itemKind": [
              {
                "calculateInd": "1",
                "clauseCode": "C01177",
                "clauseName": "京东安联财产保险有限公司留学医疗补充保险条款",
                "currency": "RMB",
                "grossPremium": 1680,
                "itemNo": 1,
                "kindCode": "0422",
                "kindInd": "1",
                "kindName": "医疗保险金（含门急诊及住院医疗）",
                "remark": "",
                "sumInsured": 100000
              }
            ],
            "itemNo": 1,
            "rationCount": 1
          }
        ]
      },
      "main": {
        "endDateStr": "2022-07-22 23:59:59",
        "endorseNo": "P3100C02109000100001675-001",
        "endorseText": "",
        "endorseType": "06",
        "giftType": "0",
        "groupNo": "",
        "inputDate": 1623945600000,
        "isSupportFamily": "N",
        "jFeeFlag": "0",
        "policyNo": "P3100C02109000100001675",
        "policyStatus": "1",
        "proposalNo": "T3100C02109000100001675",
        "renewalFlag": "0",
        "signDate": 1623945600000,
        "startDateStr": "2021-07-23 00:00:00",
        "sumAmount": 100000,
        "sumPremium": 1680,
        "sumQuantity": 1,
        "underWriteEndDate": 1626019200000,
        "validDateStr": "2021-07-23 00:00:00"
      },
      "renewal": {},
      "riskInfo": {
        "DestAirport": "",
        "FlightDate": "",
        "FlightNumber": "",
        "FlightTime": "",
        "OriginAirport": "",
        "arriveDate": "",
        "arriveTime": ""
      },
      "sales": {
        "agentCode": "AC600002",
        "agentName": "非见费出单测试渠道"
      }
    }
  },
  "requestHead": {
    "consumerID": "Apis",
    "consumerSeqNo": "a5a3214bab664b979f66d63e89227d4b",
    "transactionDate": 1626072102396
  }
}

 public static void main(String[] args) {
        String line = "{\"requestBody\":{\"newApplyNo\":\"E3100C02109000100000388\",\"policy\":{\"appliClient\":[{\"birthday\":983894400000,\"contactPhone\":\"\",\"email\":\"fgf@qq.com\",\"faxNumber\":\"XXXXXXXXXFW\",\"identifyNumber\":\"110101200103078833\",\"identifyType\":\"01\",\"insuredAddress\":\"\",\"insuredEName\":\"\",\"insuredName\":\"周军\",\"insuredType\":\"1\",\"mobile\":\"13800138000\",\"serialNo\":1,\"sex\":\"1\"}],\"coverage\":{\"itemList\":[{\"goodsCode\":\"LXSBCYLBX\",\"goodsName\":\"留学生补充医疗保险（美国版）\",\"insuredCount\":1,\"insuredIdvList\":[{\"age\":20,\"amount\":100000,\"applyDate\":1623945600000,\"basicsPolicy\":{\"basicsPolicyCompany\":\"基础保单承保公司\",\"basicsPolicyEndDate\":1658505599000,\"basicsPolicyNo\":\"基础保单保单号码\",\"basicsPolicyStartDate\":1626969600000,\"graduateYear\":\"2023\",\"insuredIdvChatNo\":\"WWWWWWWW\",\"insuredSchool\":\"就读学校\",\"linkerChatNo\":\"\",\"linkerRelation\":\"\",\"linkeridentifyNumber\":\"\"},\"beneficiary\":[],\"benefitOrder\":\"\",\"birthday\":983894400000,\"contactPhone\":\"\",\"country\":\"\",\"email\":\"15000000034@163.com\",\"endDate\":1658419200000,\"identifyNumber\":\"110101200103072258\",\"identifyType\":\"51\",\"insuredAddress\":\"\",\"insuredEName\":\"\",\"insuredFlag\":\"1\",\"insuredName\":\"周小军\",\"insuredType\":\"1\",\"itemNo\":1,\"linkerName\":\"\",\"linkerPhone\":\"\",\"mainInsuredFlag\":\"1\",\"mobile\":\"15000000034\",\"occupationCode\":\"A01001\",\"occupationGrade\":\"A\",\"occupationLevel\":\"1\",\"occupationType\":\"A01\",\"planCode\":\"LXSBCYLBX\",\"planName\":\"留学生补充医疗保险（美国版）\",\"relationToAppnt\":\"03\",\"secondIdNum\":\"\",\"secondIdType\":\"\",\"serialNo\":1,\"sex\":\"\",\"socialSecurityFlag\":\"\",\"startDate\":1626969600000}],\"itemKind\":[{\"calculateInd\":\"1\",\"clauseCode\":\"C01177\",\"clauseName\":\"京东安联财产保险有限公司留学医疗补充保险条款\",\"currency\":\"RMB\",\"grossPremium\":1680,\"itemNo\":1,\"kindCode\":\"0422\",\"kindInd\":\"1\",\"kindName\":\"医疗保险金（含门急诊及住院医疗）\",\"remark\":\"\",\"sumInsured\":100000}],\"itemNo\":1,\"rationCount\":1}]},\"main\":{\"endDateStr\":\"2022-07-22 23:59:59\",\"endorseNo\":\"P3100C02109000100001675-001\",\"endorseText\":\"\",\"endorseType\":\"06\",\"giftType\":\"0\",\"groupNo\":\"\",\"inputDate\":1623945600000,\"isSupportFamily\":\"N\",\"jFeeFlag\":\"0\",\"policyNo\":\"P3100C02109000100001675\",\"policyStatus\":\"1\",\"proposalNo\":\"T3100C02109000100001675\",\"renewalFlag\":\"0\",\"signDate\":1623945600000,\"startDateStr\":\"2021-07-23 00:00:00\",\"sumAmount\":100000,\"sumPremium\":1680,\"sumQuantity\":1,\"underWriteEndDate\":1626019200000,\"validDateStr\":\"2021-07-23 00:00:00\"},\"renewal\":{},\"riskInfo\":{\"DestAirport\":\"\",\"FlightDate\":\"\",\"FlightNumber\":\"\",\"FlightTime\":\"\",\"OriginAirport\":\"\",\"arriveDate\":\"\",\"arriveTime\":\"\"},\"sales\":{\"agentCode\":\"AC600002\",\"agentName\":\"非见费出单测试渠道\"}}},\"requestHead\":{\"consumerID\":\"Apis\",\"consumerSeqNo\":\"a5a3214bab664b979f66d63e89227d4b\",\"transactionDate\":1626072102396}}";
        JSONObject jsonObject = JSON.parseObject(line);
        JSONObject requestBody = jsonObject.getJSONObject("requestBody");
        JSONObject policy = requestBody.getJSONObject("policy");
        JSONObject coverage = policy.getJSONObject("coverage");
        JSONArray itemList = coverage.getJSONArray("itemList");
        for (int i=0;i<itemList.size();i++){
            JSONObject jsonObject1 = itemList.getJSONObject(i);
            JSONArray insuredIdvList = jsonObject1.getJSONArray("insuredIdvList");
            for (int j=0;j<insuredIdvList.size();j++){
                JSONObject jsonObject2 = insuredIdvList.getJSONObject(j);
                System.out.println(jsonObject2.getJSONObject("basicsPolicy"));
            }
        }

    }

输出结果：
{"insuredIdvChatNo":"WWWWWWWW","basicsPolicyCompany":"基础保单承保公司","linkerChatNo":"","basicsPolicyNo":"基础保单保单号码","basicsPolicyStartDate":1626969600000,"linkeridentifyNumber":"","linkerRelation":"","basicsPolicyEndDate":1658505599000,"graduateYear":"2023","insuredSchool":"就读学校"}

推荐一个神器（chrome 插件） json handle

public static void main(String[] args) throws Exception {
String str = "{"requestBody":{"newApplyNo":"E3100C02109000100000388","policy":{"appliClient":[{"birthday":983894400000,"contactPhone":"","email":"fgf@qq.com","faxNumber":"XXXXXXXXXFW","identifyNumber":"110101200103078833","identifyType":"01","insuredAddress":"","insuredEName":"","insuredName":"周军","insuredType":"1","mobile":"13800138000","serialNo":1,"sex":"1"}],"coverage":{"itemList":[{"goodsCode":"LXSBCYLBX","goodsName":"留学生补充医疗保险（美国版）","insuredCount":1,"insuredIdvList":[{"age":20,"amount":100000,"applyDate":1623945600000,"basicsPolicy":{"basicsPolicyCompany":"基础保单承保公司","basicsPolicyEndDate":1658505599000,"basicsPolicyNo":"基础保单保单号码","basicsPolicyStartDate":1626969600000,"graduateYear":"2023","insuredIdvChatNo":"WWWWWWWW","insuredSchool":"就读学校","linkerChatNo":"","linkerRelation":"","linkeridentifyNumber":""},"beneficiary":[],"benefitOrder":"","birthday":983894400000,"contactPhone":"","country":"","email":"15000000034@163.com","endDate":1658419200000,"identifyNumber":"110101200103072258","identifyType":"51","insuredAddress":"","insuredEName":"","insuredFlag":"1","insuredName":"周小军","insuredType":"1","itemNo":1,"linkerName":"","linkerPhone":"","mainInsuredFlag":"1","mobile":"15000000034","occupationCode":"A01001","occupationGrade":"A","occupationLevel":"1","occupationType":"A01","planCode":"LXSBCYLBX","planName":"留学生补充医疗保险（美国版）","relationToAppnt":"03","secondIdNum":"","secondIdType":"","serialNo":1,"sex":"","socialSecurityFlag":"","startDate":1626969600000}],"itemKind":[{"calculateInd":"1","clauseCode":"C01177","clauseName":"京东安联财产保险有限公司留学医疗补充保险条款","currency":"RMB","grossPremium":1680,"itemNo":1,"kindCode":"0422","kindInd":"1","kindName":"医疗保险金（含门急诊及住院医疗）","remark":"","sumInsured":100000}],"itemNo":1,"rationCount":1}]},"main":{"endDateStr":"2022-07-22 23:59:59","endorseNo":"P3100C02109000100001675-001","endorseText":"","endorseType":"06","giftType":"0","groupNo":"","inputDate":1623945600000,"isSupportFamily":"N","jFeeFlag":"0","policyNo":"P3100C02109000100001675","policyStatus":"1","proposalNo":"T3100C02109000100001675","renewalFlag":"0","signDate":1623945600000,"startDateStr":"2021-07-23 00:00:00","sumAmount":100000,"sumPremium":1680,"sumQuantity":1,"underWriteEndDate":1626019200000,"validDateStr":"2021-07-23 00:00:00"},"renewal":{},"riskInfo":{"DestAirport":"","FlightDate":"","FlightNumber":"","FlightTime":"","OriginAirport":"","arriveDate":"","arriveTime":""},"sales":{"agentCode":"AC600002","agentName":"非见费出单测试渠道"}}},"requestHead":{"consumerID":"Apis","consumerSeqNo":"a5a3214bab664b979f66d63e89227d4b","transactionDate":1626072102396}}";
JSON json = JSON.parseObject(str);
JSONObject jsonObject = getByKey(json, "basicsPolicy");
System.out.println(jsonObject);
}

private static JSONObject getByKey(JSON json, String special) {
    if (json instanceof JSONObject) {
        for (Map.Entry<String, Object> entry : ((JSONObject) json).entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();
            if (special.equals(key)) {
                return (JSONObject) value;
            }
            if (value instanceof JSONObject || value instanceof JSONArray) {
                return getByKey((JSON) value, special);
            }
        }
    }
    if (json instanceof JSONArray) {
        for (int i = 0; i < ((JSONArray) json).size(); i++) {
            Object value = ((JSONArray) json).get(i);
            if (value instanceof JSONObject || value instanceof JSONArray) {
                return getByKey((JSON) value, special);
            }
        }
    }
    return null;
}