本文将介绍如何使用 Josson 库，通过两个不同的 JSON 数组中相同的键，来更新 JSON 数组中的 JSON 对象。通过 Josson 的数据集连接操作，可以高效地实现数据的合并和更新，避免了复杂的嵌套循环和条件判断，从而简化了代码并提高了可读性。
Josson 是一个强大的 JSON 处理库，它提供了一系列便捷的方法来查询、转换和操作 JSON 数据。其中，数据集连接操作是 Josson 的一个重要特性，它允许用户基于指定的键，将多个 JSON 数组连接起来，从而实现数据的合并和更新。
以下代码演示了如何使用 Josson 库来更新 JSON 数组中具有相同键的 JSON 对象：
import com.fasterxml.jackson.databind.JsonNode;
import net.octomix.josson.Josson;
import net.octomix.josson.JossonException;
import net.octomix.josson.Jossons;
public class JsonUpdateExample {
public static void main(String[] args) {
try {
Jossons jossons = new Jossons();
// Deserialization
jossons.putDataset("http",
Josson.fromJsonString("[{\"userid\":\"CNRM04\",\"groupname\":\"Rohit\",\n" +
"\"segment\":\"CosPROFIN\",\"accountcode\":\"OWN\",\"symbol\":\"NIFTY\",\"exchange\":\"NSEFO\",\n" +
"\"expirydate\":\"03NOV2022\",\"scripcode\":\"38021\",\"securitytype\":\"OPT\",\n" +
"\"strikeprice\":17700,\"opttype\":\"PE\",\"bfqty\":-1500,\"bfrate\":122.35,\n" +
"\"bfamt\":18352.5,\"buyqty\":0,\"sellqty\":0,\"netqty\":0,\"cfqty\":-150,\n" +
"\"cfamt\":18352.5,\"ltp\":0,\"grossmtm\":0,\"brokerageamt\":0,\"netmtm\":0,\n" +
"\"currency\":\"INR\",\"usdrate\":1,\"clientsharing\":0,\"broksharing\":0,\n" +
"\"comsharing\":100,\"multiplier\":1},{\"userid\":\"CNRM04\",\"groupname\":\"Rohit\",\n" +
"\"segment\":\"CosPROFIN\",\"accountcode\":\"OWN\",\"symbol\":\"NIFTY\",\n" +
"\"exchange\":\"NSEFO\",\"expirydate\":\"03NOV2022\",\"scripcode\":\"38026\",\n" +
"\"securitytype\":\"OPT\",\"strikeprice\":17800,\"opttype\":\"PE\",\"bfqty\":0,\n" +
"\"bfrate\":0,\"bfamt\":0,\"buyqty\":10800,\"sellqty\":15000,\"netqty\":-4200,\n" +
"\"cfqty\":-4200,\"cfamt\":590729.9999999998,\"ltp\":0,\"grossmtm\":0,\n" +
"\"brokerageamt\":3400.2888479999992,\"netmtm\":0,\"currency\":\"INR\",\n" +
"\"usdrate\":1,\"clientsharing\":0,\"broksharing\":0,\"comsharing\":100,\n" +
"\"multiplier\":11},{\"userid\":\"CNC01\",\"groupname\":\"abhishek\",\n" +
"\"segment\":\"Cosmic\",\"accountcode\":\"APP\",\"symbol\":\"NIFTY\",\n" +
"\"exchange\":\"NSEFO\",\"expirydate\":\"03NOV2022\",\"scripcode\":\"40034\",\n" +
"\"securitytype\":\"OPT\",\"strikeprice\":1200,\"opttype\":\"PE\",\"bfqty\":12,\n" +
"\"bfrate\":2,\"bfamt\":0,\"buyqty\":100,\"sellqty\":121,\"netqty\":200,\n" +
"\"cfqty\":11,\"cfamt\":78,\"ltp\":9,\"grossmtm\":0,\"brokerageamt\":12222,\n" +
"\"netmtm\":45,\"currency\":\"INR\",\"usdrate\":2,\"clientsharing\":0,\"broksharing\":0,\"comsharing\":0,\n" +
"\"multiplier\":99}]"));
jossons.putDataset("websocket",
Josson.fromJsonString("[{\"userid\":\"CNRM04\",\"groupname\":\"Rohit\",\"segment\":\"CosPROFIN\",\"accountcode\":\"OWN\",\"symbol\":\"NIFTY\",\"exchange\":\"NSEFO\",\"expirydate\":\"03NOV2022\",\"scripcode\":\"38021\",\"securitytype\":\"OPT\",\"strikeprice\":17700,\"opttype\":\"PE\",\"bfqty\":20,\"bfrate\":122.35,\"bfamt\":18352.5,\"buyqty\":0,\"sellqty\":0,\"netqty\":0,\"cfqty\":-150,\"cfamt\":18352.5,\"ltp\":0,\"grossmtm\":0,\"brokerageamt\":0,\"netmtm\":0,\"currency\":\"INR\",\"usdrate\":1,\"clientsharing\":0,\"broksharing\":0,\"comsharing\":100,\"multiplier\":1},{\"userid\":\"CNRM04\",\"groupname\":\"Rohit\",\"segment\":\"CosPROFIN\",\"accountcode\":\"OWN\",\"symbol\":\"NIFTY\",\"exchange\":\"NSEFO\",\"expirydate\":\"03NOV2022\",\"scripcode\":\"38026\",\"securitytype\":\"OPT\",\"strikeprice\":17800,\"opttype\":\"PE\",\"bfqty\":30,\"bfrate\":0,\"bfamt\":0,\"buyqty\":10800,\"sellqty\":15000,\"netqty\":-4200,\"cfqty\":-4200,\"cfamt\":590729.9999999998,\"ltp\":0,\"grossmtm\":0,\"brokerageamt\":3400.2888479999992,\"netmtm\":0,\"currency\":\"INR\",\"usdrate\":1,\"clientsharing\":0,\"broksharing\":0,\"comsharing\":100,\"multiplier\":1}]]"));
// Left Join operation
JsonNode node = jossons.evaluateQuery(
"http{userid,scripcode} <=< websocket->map(userid,scripcode,bfqty){userid,scripcode}");
System.out.println(node.toPrettyString());
} catch (JossonException e) {
e.printStackTrace();
}
}
}代码解释：
Easily find JSON paths within JSON objects using our intuitive Json Path Finder
30
输出结果：
[ {
"userid" : "CNRM04",
"groupname" : "Rohit",
"segment" : "CosPROFIN",
"accountcode" : "OWN",
"symbol" : "NIFTY",
"exchange" : "NSEFO",
"expirydate" : "03NOV2022",
"scripcode" : "38021",
"securitytype" : "OPT",
"strikeprice" : 17700,
"opttype" : "PE",
"bfqty" : 20,
"bfrate" : 122.35,
"bfamt" : 18352.5,
"buyqty" : 0,
"sellqty" : 0,
"netqty" : 0,
"cfqty" : -150,
"cfamt" : 18352.5,
"ltp" : 0,
"grossmtm" : 0,
"brokerageamt" : 0,
"netmtm" : 0,
"currency" : "INR",
"usdrate" : 1,
"clientsharing" : 0,
"broksharing" : 0,
"comsharing" : 100,
"multiplier" : 1
}, {
"userid" : "CNRM04",
"groupname" : "Rohit",
"segment" : "CosPROFIN",
"accountcode" : "OWN",
"symbol" : "NIFTY",
"exchange" : "NSEFO",
"expirydate" : "03NOV2022",
"scripcode" : "38026",
"securitytype" : "OPT",
"strikeprice" : 17800,
"opttype" : "PE",
"bfqty" : 30,
"bfrate" : 0,
"bfamt" : 0,
"buyqty" : 10800,
"sellqty" : 15000,
"netqty" : -4200,
"cfqty" : -4200,
"cfamt" : 590729.9999999998,
"ltp" : 0,
"grossmtm" : 0,
"brokerageamt" : 3400.2888479999992,
"netmtm" : 0,
"currency" : "INR",
"usdrate" : 1,
"clientsharing" : 0,
"broksharing" : 0,
"comsharing" : 100,
"multiplier" : 11
}, {
"userid" : "CNC01",
"groupname" : "abhishek",
"segment" : "Cosmic",
"accountcode" : "APP",
"symbol" : "NIFTY",
"exchange" : "NSEFO",
"expirydate" : "03NOV2022",
"scripcode" : "40034",
"securitytype" : "OPT",
"strikeprice" : 1200,
"opttype" : "PE",
"bfqty" : 12,
"bfrate" : 2,
"bfamt" : 0,
"buyqty" : 100,
"sellqty" : 121,
"netqty" : 200,
"cfqty" : 11,
"cfamt" : 78,
"ltp" : 9,
"grossmtm" : 0,
"brokerageamt" : 12222,
"netmtm" : 45,
"currency" : "INR",
"usdrate" : 2,
"clientsharing" : 0,
"broksharing" : 0,
"comsharing" : 0,
"multiplier" : 99
} ]可以看到，http 数组中 userid 和 scripcode 与 websocket 数组匹配的对象的 bfqty 字段已成功更新。
使用 Josson 库可以方便地实现 JSON 数组中对象的更新操作。通过数据集连接操作，可以避免复杂的循环和条件判断，从而简化代码并提高可读性。在处理 JSON 数据时，Josson 库是一个强大的工具，值得学习和掌握。
以上就是使用 Josson 库更新 JSON 数组中具有相同键的 JSON 对象的详细内容，更多请关注php中文网其它相关文章！
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