本文介绍了如何使用 Josson 库，根据特定条件对 JSON 数组中的键值进行聚合。通过分组和映射操作，可以高效地对满足相同条件的 JSON 对象进行数值累加，从而生成汇总后的 JSON 数据。本文提供了详细的代码示例和步骤说明，帮助读者理解和应用 Josson 库解决实际问题。
在处理 JSON 数据时，经常会遇到需要根据某些键的值对其他键的值进行聚合的情况。例如，在金融数据分析中，可能需要根据用户ID、交易组、交易品种等条件，对交易量、手续费等进行汇总。手动编写代码实现这种聚合逻辑通常比较繁琐且容易出错。Josson 库提供了一种简洁高效的方式来解决这类问题。
Josson 是一个用于转换和查询 JSON 数据的 Java 库。它提供了一种类似于 SQL 的查询语言，可以方便地对 JSON 数据进行过滤、排序、分组、聚合等操作。
使用 Josson 进行 JSON 数据聚合
以下步骤展示了如何使用 Josson 库按条件聚合 JSON 数组中的键值：
添加 Josson 依赖
首先，需要在项目中添加 Josson 库的依赖。如果使用 Maven，可以在 pom.xml 文件中添加以下依赖：
```xml com.octomix josson 最新版本```
请替换 最新版本 为 Josson 库的最新版本号。
准备 JSON 数据
假设有如下 JSON 数组，需要根据 userid、groupname、segment、accountcode、symbol、exchange 和 expirydate 相同的条件，对 bfqty、bfrate、bfamt、buyqty、sellqty、netqty、cfqty、cfamt、ltp、grossmtm、brokerageamt 和 netmtm 进行求和：
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```json[ { "userid": "CNAF01", "groupname": "Abhay", "segment": "CosCLFIN", "accountcode": "66CN-063CC", "symbol": "INX22", "exchange": "SGXFO", "expirydate": "24NOV2022", "scripcode": "7536847", "securitytype": "FUT", "strikeprice": 0, "opttype": "XX", "bfqty": -107, "bfrate": 18462.05, "bfamt": 3950878.6999999997, "buyqty": 21, "sellqty": 59, "netqty": -38, "cfqty": -145, "cfamt": 5358027.699999999, "ltp": "18433.5", "grossmtm": 0, "brokerageamt": 48, "netmtm": 0, "currency": "USD", "usdrate": 81.33, "clientsharing": 50, "broksharing": 0, "comsharing": 50, "multiplier": 2 }, { "userid": "CNAF01", "groupname": "Abhay", "segment": "CosCLFIN", "accountcode": "CW05", "symbol": "NIFTY", "exchange": "NSEFO", "expirydate": "24NOV2022", "scripcode": "61349", "securitytype": "OPT", "strikeprice": 17800, "opttype": "CE", "bfqty": 4050, "bfrate": 673.3, "bfamt": -2726865, "buyqty": 1650, "sellqty": 300, "netqty": 1350, "cfqty": 5400, "cfamt": -3677257.5, "ltp": "657.0", "grossmtm": 0, "brokerageamt": 1038.81126525, "netmtm": 0, "currency": "INR", "usdrate": 1, "clientsharing": 0, "broksharing": 0, "comsharing": 100, "multiplier": 1 }, { "userid": "CNAF01", "groupname": "Abhay", "segment": "CosCLFIN", "accountcode": "CW05", "symbol": "NIFTY", "exchange": "NSEFO", "expirydate": "24NOV2022", "scripcode": "61350", "securitytype": "OPT", "strikeprice": 17800, "opttype": "PE", "bfqty": -4050, "bfrate": 14.7, "bfamt": 59535, "buyqty": 300, "sellqty": 1650, "netqty": -1350, "cfqty": -5400, "cfamt": 78900, "ltp": "13.6", "grossmtm": 0, "brokerageamt": 31.850901, "netmtm": 0, "currency": "INR", "usdrate": 1, "clientsharing": 0, "broksharing": 0, "comsharing": 100, "multiplier": 1 }]```
使用 Josson 进行聚合
使用以下 Java 代码，利用 Josson 库对 JSON 数据进行聚合：
```javaimport com.octomix.josson.Josson;import com.octomix.josson.JsonNode;import javax.json.JsonString;public class JossonAggregation { public static void main(String[] args) { String jsonString = "[{"userid":"CNAF01","groupname":"Abhay","segment":"CosCLFIN","accountcode":"66CN-063CC","symbol":"INX22","exchange":"SGXFO","expirydate":"24NOV2022"," + ""scripcode":"7536847","securitytype":"FUT","strikeprice":0,"opttype":"XX","bfqty":-107,"bfrate":18462.05,"bfamt":3950878.6999999997,"buyqty":21,"sellqty":59,"netqty":-38," + ""cfqty":-145,"cfamt":5358027.699999999,"ltp":"18433.5","grossmtm":0,"brokerageamt":48,"netmtm":0,"currency":"USD","usdrate":81.33,"clientsharing":50,"broksharing":0," + ""comsharing":50,"multiplier":2}," + "{"userid":"CNAF01","groupname":"Abhay","segment":"CosCLFIN","accountcode":"CW05","symbol":"NIFTY","exchange":"NSEFO"," + ""expirydate":"24NOV2022","scripcode":"61349","securitytype":"OPT","strikeprice":17800,"opttype":"CE","bfqty":4050,"bfrate":673.3,"bfamt":-2726865,"buyqty":1650," + ""sellqty":300,"netqty":1350,"cfqty":5400,"cfamt":-3677257.5,"ltp":"657.0","grossmtm":0,"brokerageamt":1038.81126525,"netmtm":0,"currency":"INR","usdrate":1,"clientsharing":0," + ""broksharing":0,"comsharing":100,"multiplier":1}," + "{"userid":"CNAF01","groupname":"Abhay","segment":"CosCLFIN","accountcode":"CW05","symbol":"NIFTY","exchange":"NSEFO"," + ""expirydate":"24NOV2022","scripcode":"61350","securitytype":"OPT","strikeprice":17800,"opttype":"PE","bfqty":-4050,"bfrate":14.7,"bfamt":59535,"buyqty":300,"sellqty":1650," + ""netqty":-1350,"cfqty":-5400,"cfamt":78900,"ltp":"13.6","grossmtm":0,"brokerageamt":31.850901,"netmtm":0,"currency":"INR","usdrate":1,"clientsharing":0,"broksharing":0," + ""comsharing":100,"multiplier":1}]"; Josson josson = Josson.fromJsonString(jsonString); JsonNode node = josson.getNode( "group(map(userid,groupname,segment,accountcode,symbol,exchange,expirydate," + " currency,usdrate,clientsharing,broksharing,comsharing,multiplier))" + ".map(key.userid," + " key.groupname," + " key.segment," + " key.accountcode," + " key.symbol," + " key.exchange," + " key.expirydate," + " key.currency," + " key.usdrate," + " key.clientsharing," + " key.broksharing," + " key.comsharing," + " key.multiplier," + " elements.bfqty.sum()," + " elements.bfrate.sum()," + " elements.bfamt.sum()," + " elements.buyqty.sum()," + " elements.sellqty.sum()," + " elements.netqty.sum()," + " elements.cfqty.sum()," + " elements.cfamt.sum()," + " elements.ltp.sum()," + " elements.grossmtm.sum()," + " elements.brokerageamt.sum()," + " elements.netmtm.sum())"); System.out.println(node.toPrettyString()); }}```
这段代码首先使用 Josson.fromJsonString() 方法将 JSON 字符串转换为 Josson 对象。然后，使用 getNode() 方法执行 Josson 查询。
group(map(…)) 根据指定的键对 JSON 数组进行分组。map(…) 对每个分组后的元素进行映射，生成新的 JSON 对象。key.键名 引用分组的键值。elements.键名.sum() 对分组后的元素的指定键进行求和。查看结果
运行以上代码，将得到以下结果：
```json[ { "userid" : "CNAF01", "groupname" : "Abhay", "segment" : "CosCLFIN", "accountcode" : "66CN-063CC", "symbol" : "INX22", "exchange" : "SGXFO", "expirydate" : "24NOV2022", "currency" : "USD", "usdrate" : 81.33, "clientsharing" : 50, "broksharing" : 0, "comsharing" : 50, "multiplier" : 2, "bfqty" : -107.0, "bfrate" : 18462.05, "bfamt" : 3950878.6999999997, "buyqty" : 21.0, "sellqty" : 59.0, "netqty" : -38.0, "cfqty" : -145.0, "cfamt" : 5358027.699999999, "ltp" : 18433.5, "grossmtm" : 0.0, "brokerageamt" : 48.0, "netmtm" : 0.0}, { "userid" : "CNAF01", "groupname" : "Abhay", "segment" : "CosCLFIN", "accountcode" : "CW05", "symbol" : "NIFTY", "exchange" : "NSEFO", "expirydate" : "24NOV2022", "currency" : "INR", "usdrate" : 1, "clientsharing" : 0, "broksharing" : 0, "comsharing" : 100, "multiplier" : 1, "bfqty" : 0.0, "bfrate" : 688.0, "bfamt" : -2667330.0, "buyqty" : 1950.0, "sellqty" : 1950.0, "netqty" : 0.0, "cfqty" : 0.0, "cfamt" : -3598357.5, "ltp" : 670.6, "grossmtm" : 0.0, "brokerageamt" : 1070.66216625, "netmtm" : 0.0} ]```
可以看到，Josson 库成功地根据指定的条件对 JSON 数组中的键值进行了聚合。
注意事项
Josson 库的查询语言功能强大，可以实现各种复杂的 JSON 数据转换和查询操作。在使用 Josson 库时，需要仔细阅读其文档，了解其语法和用法。对于复杂的 JSON 数据结构，可以使用 Josson 库的调试功能，逐步调试查询语句，确保其正确性。根据实际情况选择合适的分组键和聚合函数，以满足业务需求。
总结
本文介绍了如何使用 Josson 库按条件聚合 JSON 数组中的键值。通过 Josson 库提供的分组和映射功能，可以方便地实现复杂的 JSON 数据聚合逻辑，提高开发效率。Josson 库在处理 JSON 数据时具有很大的优势，值得深入学习和应用。
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