我有一个看起来像这样的json文件：
从此json，我只需要获取每个航班的总价。而且我需要以一种方式（即段列表大小）获取航班数量。我已经使用http://www.jsonschema2pojo.org/创建了很多对象。通过大量的for循环，我获得了必要的数据。但是我的问题是：有没有更简单的方法可以从此json文件中获取此信息？
{
"type": "flight-offer",
"id": "1549454712606-1539032420",
"offerItems": [
{
"services": [
{
"segments": [
{
"flightSegment": {
"departure": {
"iataCode": "SJJ",
"at": "2019-02-08T06:30:00+01:00"
},
"arrival": {
"iataCode": "ZAG",
"at": "2019-02-08T07:20:00+01:00"
},
"carrierCode": "OU",
"number": "341",
"aircraft": {
"code": "DH4"
},
"operating": {
"carrierCode": "OU",
"number": "341"
},
"duration": "0DT0H50M"
},
"pricingDetailPerAdult": {
"travelClass": "ECONOMY",
"fareClass": "K",
"availability": 3,
"fareBasis": "KEASY2"
}
}
]
},
{
"segments": [
{
"flightSegment": {
"departure": {
"iataCode": "ZAG",
"at": "2019-02-15T14:10:00+01:00"
},
"arrival": {
"iataCode": "SJJ",
"at": "2019-02-15T15:00:00+01:00"
},
"carrierCode": "OU",
"number": "344",
"aircraft": {
"code": "DH4"
},
"operating": {
"carrierCode": "OU",
"number": "344"
},
"duration": "0DT0H50M"
},
"pricingDetailPerAdult": {
"travelClass": "ECONOMY",
"fareClass": "U",
"availability": 9,
"fareBasis": "UEASY2"
}
}
]
}
],
"price": {
"total": "164.09",
"totalTaxes": "83.09"
},
"pricePerAdult": {
"total": "164.09",
"totalTaxes": "83.09"
}
}
]
},
{
"type": "flight-offer",
"id": "1549454712606--1458421402",
"offerItems": [
{
"services": [
{
"segments": [
{
"flightSegment": {
"departure": {
"iataCode": "SJJ",
"at": "2019-02-08T15:10:00+01:00"
},
"arrival": {
"iataCode": "BEG",
"terminal": "2",
"at": "2019-02-08T16:00:00+01:00"
},
"carrierCode": "JU",
"number": "113",
"aircraft": {
"code": "AT7"
},
"operating": {
"carrierCode": "JU",
"number": "113"
},
"duration": "0DT0H50M"
},
"pricingDetailPerAdult": {
"travelClass": "ECONOMY",
"fareClass": "U",
"availability": 7,
"fareBasis": "UNBRBA"
}
},
{
"flightSegment": {
"departure": {
"iataCode": "BEG",
"terminal": "2",
"at": "2019-02-08T18:20:00+01:00"
},
"arrival": {
"iataCode": "ZAG",
"at": "2019-02-08T19:35:00+01:00"
},
"carrierCode": "JU",
"number": "234",
"aircraft": {
"code": "AT7"
},
"operating": {
"carrierCode": "JU",
"number": "234"
},
"duration": "0DT1H15M"
},
"pricingDetailPerAdult": {
"travelClass": "ECONOMY",
"fareClass": "U",
"availability": 7,
"fareBasis": "UNBRBA"
}
}
]
},
{
"segments": [
{
"flightSegment": {
"departure": {
"iataCode": "ZAG",
"at": "2019-02-15T10:00:00+01:00"
},
"arrival": {
"iataCode": "BEG",
"terminal": "2",
"at": "2019-02-15T11:05:00+01:00"
},
"carrierCode": "JU",
"number": "231",
"aircraft": {
"code": "AT7"
},
"operating": {
"carrierCode": "JU",
"number": "231"
},
"duration": "0DT1H5M"
},
"pricingDetailPerAdult": {
"travelClass": "ECONOMY",
"fareClass": "U",
"availability": 7,
"fareBasis": "UNBRBA"
}
},
{
"flightSegment": {
"departure": {
"iataCode": "BEG",
"terminal": "2",
"at": "2019-02-15T13:50:00+01:00"
},
"arrival": {
"iataCode": "SJJ",
"at": "2019-02-15T14:40:00+01:00"
},
"carrierCode": "JU",
"number": "112",
"aircraft": {
"code": "AT7"
},
"operating": {
"carrierCode": "JU",
"number": "112"
},
"duration": "0DT0H50M"
},
"pricingDetailPerAdult": {
"travelClass": "ECONOMY",
"fareClass": "U",
"availability": 7,
"fareBasis": "UNBRBA"
}
}
]
}
],
"price": {
"total": "225.45",
"totalTaxes": "145.45"
},
"pricePerAdult": {
"total": "225.45",
"totalTaxes": "145.45"
}
}
]
}
答案 0 :(得分：2)
您的JSON包含两个用逗号分隔的单独对象。您需要添加方括号：
[{...},{...}]
如果只需要price，则可以阅读以下内容的JSON：
ObjectMapper mapper = new ObjectMapper();
JsonNode node = mapper.readTree(source);
List<JsonNode> prices = node.findValues("price");
for (JsonNode price : prices) {
System.out.println(price.get("total"));
System.out.println(price.get("totalTaxes"));
}
编辑
您可以通过类似的方式找到flighSegment：
ObjectMapper mapper = new ObjectMapper();
JsonNode node = mapper.readTree(jsonFile);
List<JsonNode> segments = node.findValues("segments");
for (JsonNode segment : segments) {
List<JsonNode> flightSegments = segment.findValues("flightSegment");
System.out.println(flightSegments.size());
}
有关更多信息，请参见：
答案 1 :(得分：0)
适合此工作的工具是JsonPath，它允许对JSON树进行类似XPath的查询。 这是获取请求信息的示例
String json = new String(Files.readAllBytes(Paths.get("c:/temp/xx.json")));
// search for price object anywhere in the json doc and get total object under it
// the search returns a list because of the deep search operator ".."
List<String> ls = JsonPath.read(json, "$..price.total");
String priceValueStr = ls.get(0);
System.out.println(priceValueStr);
// search for segments array anywhere in the json doc and return array's length
List<Integer> li = JsonPath.read(json, "$..segments.length()");
Integer segments = li.get(0);
System.out.println(segments);