java中如何判断JSONObject是否存在某个Key
目录
- 判断JSONObject是否存在某个Key
- 检查json字符串中是否存在该key
- 下面介绍我自己的情况
判断JSONObject是否存在某个Key
JSONObject jsonObj = new JSONObject(); jsonObj.put("version", "1.0.0"); // 版本号 jsonObj.put("encoding", "UTF-8"); // 编码方式
判断jsonObject是否存在vesion属性
jsonObj.has("version"); // 返回true
检查json字符串中是否存在该key
初衷,是由于工作需要,两个单位需要接口数据对接,单位一需要发送json数据串到单位二,然而单位一发送的json数据中的字段不确定,听他们解释说,客户在系统上输那些字段,他们就会把那些字段带过来,然后那些客户不输入的字段,他们就会默认不带。单位一要求单位二,将这种检测出不带的字段默认值为空!
所以作为单位二,我们就需要想办法检测到单位一哪些字段没带过来。起初立马想到的办法就是用异常情况处理,因为程序本身测试的时候就报not found了,所以用异常处理情有可原吧。。。如果用异常的,想了一下只能捕捉到not found之后,在finally里将捕捉到的这个字段直接置空就ok了。
那么问题来了,对异常的情况试了一下,finally太多不好处理;所以就想了用另外一个方法,用json的一个containsKey()函数来判断json串中是否存在这个key,即是否存在这个字段;当然,还有其他函数也可以判断的,这个根据自己引入的json包了。
下面介绍我自己的情况
导入的jar包为:
首先我导入的json包:
import net.sf.json.JSONArray; import net.sf.json.JSONObject;
代码如下:
/** * 9903接口解析json数据并且将数据进行入库 * * @author syp * @time 2019年7月3日11:49:02 */ public String dateRepository(String jsonData) { Log4jBean.logger.info("开始处理入库程序!"); ReadConfig.PullConfigXml(); //启动配置文件 DBUtils db = new DBUtils(); JSONObject json=new JSONObject(); String jsonStr=jsonData.substring(44, jsonData.length()); JSONObject jsonObject = JSONObject.fromObject(jsonStr); JSONObject jsonCard=jsonObject.getJSONObject("cardid_info") JSONObject jsonObu = jsonObject.getJSONObject("obu_info"); JSONObject jsonUser=jsonObject.getJSONObject("user_info"); JSONObject jsonCar = jsonObject.getJSONObject("car_info"); //准备将所有json数据信息入开卡集合表ETC_OPEN_CARD_COLLECTION JSONObject jsonAccno = jsonObject.getJSONObject("accno_info"); String allSql = "insert into ETC_OPEN_CARD_COLLECTION(ACCOUNTID,LINKMOBILE,ACCNO_USERNAME,CERTSN,POSID,GENTIME,TRX_SERNO,EMPLOYEEID,ORG_TRX_SERNO,CARD_ID,CARDTYPE,CARD_BRAND,CARD_MODEL,AGENCYID,CARD_USERID,VEHICLEID,ENABLETIME,EXPIRETIME,ISSUEDTYPE,CHANNELID,ISSUEDTIME,CARD_STATUS,STATUSCHANGETIME,CARD_OPERATION,OBU_ID,OBU_BRAND,OBU_MODEL,OBU_USERID,OBU_VEHICLEID,OBU_ENABLETIME,OBU_EXPIRETIME,REGISTEREDTYPE,REGISTEREDCHANNELID,REGISTEREDTIME,INSTALLTYPE,INSTALLCHANNELID,INSTALLTIME,OBU_STATUS,OBU_STATUSCHANGETIME,OBU_OPERATION,USER_ID,USERTYPE,USER_NAME,USERIDTYPE,USERIDNUM,USER_TEL,USER_ADDRESS,USER_REGISTEREDTYPE,USER_CHANNELID,USER_REGISTEREDTIME,DEPARTMENT,AGENTNAME,AGENTIDTYPE,AGENTIDNUM,USER_STATUS,USER_STATUSCHANGETIME,USER_OPERATION,CAR_ID,CAR_TYPE,CAR_USERID,OWNERNAME,OWNERIDTYPE,OWNERIDNUM,OWNERTEL,CAR_ADDRESS,CAR_CONTACT,CAR_REGISTEREDTYPE,CAR_CHANNELID,CAR_REGISTEREDTIME,VEHICLETYPE,VEHICLEMODEL,USECHARACTER,VIN,ENGINENUM,REGISTERDATE,ISSUEDATE,FILENUM,APPROVEDCOUNT,TOTALMASS,MAINTENANCEMASS,PERMITTEDWEIGHT,OUTSIDEDIMENSIONS,PERMITTEDTOWWEIGHT,TESTRECORD,WHEELCOUNT,AXLECOUNT,AXLEDISTANCE,AXISTYPE,CAR_OPERATION) values('" + (jsonAccno.containsKey("accountid")?jsonAccno.getString("accountid"):"") + "','" + (jsonAccno.containsKey("linkmobile")?jsonAccno.getString("linkmobile"):"") + "','" + (jsonAccno.containsKey("username")?jsonAccno.getString("username"):"") + "','" + (jsonAccno.containsKey("certsn")?jsonAccno.getString("certsn"):"") + "','" + (jsonAccno.containsKey("posid")?jsonAccno.getString("posid"):"") + "','" + (jsonAccno.containsKey("gentime")?jsonAccno.getString("gentime"):"") + "','" + (jsonAccno.containsKey("trx_serno")?jsonAccno.getString("trx_serno"):"") + "','" + (jsonAccno.containsKey("employeeid")?jsonAccno.getString("employeeid"):"") + "','" + (jsonAccno.containsKey("org_trx_serno")?jsonAccno.getString("org_trx_serno"):"") + "','" + (jsonCard.containsKey("id")?jsonCard.getString("id"):"") + "','" + (jsonCard.containsKey("cardType")?jsonCard.getString("cardType"):"") + "','" + (jsonCard.containsKey("brand")?jsonCard.getString("brand"):"") + "','" + (jsonCard.containsKey("model")?jsonCard.getString("model"):"") + "','" + (jsonCard.containsKey("agencyId")?jsonCard.getString("agencyId"):"") + "','" + (jsonCard.containsKey("userId")?jsonCard.getString("userId"):"") + "','" + (jsonCard.containsKey("vehicleId")?jsonCard.getString("vehicleId"):"") + "','" + (jsonCard.containsKey("enableTime")?jsonCard.getString("enableTime"):"") + "','" + (jsonCard.containsKey("expireTime")?jsonCard.getString("expireTime"):"") + "','" + (jsonCard.containsKey("issuedType")?jsonCard.getString("issuedType"):"") + "','" + (jsonCard.containsKey("channelId")?jsonCard.getString("channelId"):"") + "','" + (jsonCard.containsKey("issuedTime")?jsonCard.getString("issuedTime"):"") + "','" + (jsonCard.containsKey("status")?jsonCard.getString("status"):"") + "','" + (jsonCard.containsKey("statusChangeTime")?jsonCard.getString("statusChangeTime"):"") + "','" + (jsonCard.containsKey("operation")?jsonCard.getString("operation"):"") + "','" + (jsonObu.containsKey("id")?jsonObu.getString("id"):"") + "','" + (jsonObu.containsKey("brand")?jsonObu.getString("brand"):"") + "','" + (jsonObu.containsKey("model")?jsonObu.getString("model"):"") + "','" + (jsonObu.containsKey("userId")?jsonObu.getString("userId"):"") + "','" + (jsonObu.containsKey("vehicleId")?jsonObu.getString("vehicleId"):"") + "','" + (jsonObu.containsKey("enableTime")?jsonObu.getString("enableTime"):"") + "','" + (jsonObu.containsKey("expireTime")?jsonObu.getString("expireTime"):"") + "','" + (jsonObu.containsKey("registeredType")?jsonObu.getString("registeredType"):"") + "','" + (jsonObu.containsKey("registeredChannelId")?jsonObu.getString("registeredChannelId"):"") + "','" + (jsonObu.containsKey("registeredTime")?jsonObu.getString("registeredTime"):"") + "','" + (jsonObu.containsKey("installType")?jsonObu.getString("installType"):"") + "','" + (jsonObu.containsKey("installChannelId")?jsonObu.getString("installChannelId"):"") + "','" + (jsonObu.containsKey("installTime")?jsonObu.getString("installTime"):"") + "','" + (jsonObu.containsKey("status")?jsonObu.getString("status"):"") + "','" + (jsonObu.containsKey("statusChangeTime")?jsonObu.getString("statusChangeTime"):"") + "','" + (jsonObu.containsKey("operation")?jsonObu.getString("operation"):"") + "','" + (jsonUser.containsKey("id")?jsonUser.getString("id"):"") + "','" + (jsonUser.containsKey("userType")?jsonUser.getString("userType"):"") + "','" + (jsonUser.containsKey("userName")?jsonUser.getString("userName"):"") + "','" + (jsonUser.containsKey("userIdType")?jsonUser.getString("userIdType"):"") + "','" + (jsonUser.containsKey("userIdNum")?jsonUser.getString("userIdNum"):"") + "','" + (jsonUser.containsKey("tel")?jsonUser.getString("tel"):"") + "','" + (jsonUser.containsKey("address")?jsonUser.getString("address"):"") + "','" + (jsonUser.containsKey("registeredType")?jsonUser.getString("registeredType"):"") + "','" + (jsonUser.containsKey("channelId")?jsonUser.getString("channelId"):"") + "','" + (jsonUser.containsKey("registeredTime")?jsonUser.getString("registeredTime"):"") + "','" + (jsonUser.containsKey("department")?jsonUser.getString("department"):"") + "','" + (jsonUser.containsKey("agentName")?jsonUser.getString("agentName"):"") + "','" + (jsonUser.containsKey("agentIdType")?jsonUser.getString("agentIdType"):"") + "','" + (jsonUser.containsKey("agentIdNum")?jsonUser.getString("agentIdNum"):"") + "','" + (jsonUser.containsKey("status")?jsonUser.getString("status"):"") + "','" + (jsonUser.containsKey("statusChangeTime")?jsonUser.getString("statusChangeTime"):"") + "','" + (jsonUser.containsKey("operation")?jsonUser.getString("operation"):"") + "','" + (jsonCar.containsKey("id")?jsonCar.getString("id"):"") + "','" + (jsonCar.containsKey("type")?jsonCar.getString("type"):"") + "','" + (jsonCar.containsKey("userId")?jsonCar.getString("userId"):"") + "','"+ (jsonCar.containsKey("ownerName")?jsonCar.getString("ownerName"):"") + "','"+ (jsonCar.containsKey("ownerIdType")?jsonCar.getString("ownerIdType"):"") + "','"+ (jsonCar.containsKey("ownerIdNum")?jsonCar.getString("ownerIdNum"):"") + "','"+ (jsonCar.containsKey("ownerTel")?jsonCar.getString("ownerTel"):"") + "','"+ (jsonCar.containsKey("address")?jsonCar.getString("address"):"") + "','"+ (jsonCar.containsKey("contact")?jsonCar.getString("contact"):"") + "','"+ (jsonCar.containsKey("registeredType")?jsonCar.getString("registeredType"):"") + "','"+ (jsonCar.containsKey("channelId")?jsonCar.getString("channelId"):"") + "','"+ (jsonCar.containsKey("registeredTime")?jsonCar.getString("registeredTime"):"") + "','"+ (jsonCar.containsKey("vehicleType")?jsonCar.getString("vehicleType"):"") + "','"+ (jsonCar.containsKey("vehicleModel")?jsonCar.getString("vehicleModel"):"") + "','"+ (jsonCar.containsKey("useCharacter")?jsonCar.getString("useCharacter"):"") + "','"+ (jsonCar.containsKey("VIN")?jsonCar.getString("VIN"):"") + "','"+ (jsonCar.containsKey("engineNum")?jsonCar.getString("engineNum"):"") + "','"+ (jsonCar.containsKey("registerDate")?jsonCar.getString("registerDate"):"") + "','"+ (jsonCar.containsKey("issueDate")?jsonCar.getString("issueDate"):"") + "','"+ (jsonCar.containsKey("fileNum")?jsonCar.getString("fileNum"):"") + "','"+ (jsonCar.containsKey("approvedCount")?jsonCar.getString("approvedCount"):"") + "','"+ (jsonCar.containsKey("totalMass")?jsonCar.getString("totalMass"):"") + "','"+ (jsonCar.containsKey("maintenanceMass")?jsonCar.getString("maintenanceMass"):"") + "','"+ (jsonCar.containsKey("permittedWeight")?jsonCar.getString("permittedWeight"):"") + "','"+ (jsonCar.containsKey("outsideDimensions")?jsonCar.getString("outsideDimensions"):"") + "','"+ (jsonCar.containsKey("permittedTowWeight")?jsonCar.getString("permittedTowWeight"):"") + "','"+ (jsonCar.containsKey("testRecord")?jsonCar.getString("testRecord"):"") + "','"+ (jsonCar.containsKey("wheelCount")?jsonCar.getString("wheelCount"):"") + "','"+ (jsonCar.containsKey("axleCount")?jsonCar.getString("axleCount"):"") + "','"+ (jsonCar.containsKey("axleDistance")?jsonCar.getString("axleDistance"):"") + "','"+ (jsonCar.containsKey("axisType")?jsonCar.getString("axisType"):"") + "','"+ (jsonCar.containsKey("operation")?jsonCar.getString("operation"):"") + "')"; int allParam = db.updateMethod(allSql, null); if (allParam > 0) { Log4jBean.logger.info("开卡集合数据写入开卡集合表成功!"); json.put("return_msg", "处理成功!"); json.put("return_code", "0"); } else { Log4jBean.logger.error("开卡集合数据写入开卡集合表失败!"); json.put("return_msg", "处理失败!"); json.put("return_code", "-1"); } return json.toString(); }
通过代码可以看出,每个字段都用containsKey()函数做了处理,这样就不用害怕单位一发过来的j'son串中哪个字段找不到的情况了;
最后经测试已成功入库。。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。
赞 (0)