解析 JSON 字符串 java，最佳实践
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parse JSON string java, best practice
提问by Armen Arzumanyan
I have JSON string/response and I need simple parse it and get objects/arrays, it can be repeated, so I need get list by list, actually I do not know how to do it, because a lot of parsers and all examples with simple JSON-es, but my is bit difficult and I need to navigate in it. Here is a example of my JSON
我有 JSON 字符串/响应，我需要简单解析它并获取对象/数组，它可以重复，所以我需要按列表获取列表，实际上我不知道该怎么做，因为很多解析器和所有示例都带有简单的 JSON-es，但我的有点困难，我需要在其中导航。这是我的 JSON 示例
{
"HotelListResponse": {
"customerSessionId": "0ABAAA83-04C7-5B91-40A2-754D7299476C",
"numberOfRoomsRequested": 1,
"moreResultsAvailable": true,
"cacheKey": "-4804c75b:140a754d729:4da2",
"cacheLocation": "10.186.170.131:7300",
"HotelList": {
"@activePropertyCount": "1157",
"@size": "1",
"HotelSummary": {
"@order": "0",
"hotelId": 403147,
"name": "Justabed - Hostel",
"address1": "38 avenue augustin dumont",
"city": "Malakoff",
"postalCode": 92240,
"countryCode": "FR",
"airportCode": " ",
"supplierType": "E",
"propertyCategory": 5,
"hotelRating": 0,
"confidenceRating": 52,
"amenityMask": 8,
"tripAdvisorRating": 1.5,
"locationDescription": "Near Paris Expo Porte de Versailles",
"shortDescription": "<p><b>Property Location</b> <br />With a stay at Justabed in Vanves, you'll be close to Stade de la Plaine and Eiffel Tower.<br/> This hostel is within close proximity of Georges Brassens Park and",
"highRate": 24.87,
"lowRate": 24.87,
"rateCurrencyCode": "EUR",
"latitude": 48.81804,
"longitude": 2.30196,
"proximityDistance": 2.5680416,
"proximityUnit": "MI",
"hotelInDestination": true,
"thumbNailUrl": "/hotels/5000000/4850000/4849100/4849100/4849100_7_t.jpg",
"deepLink": "http://travel.ian.com/index.jsp?pageName=hotAvail&cid=55505&hotelID=403147&mode=2&numberOfRooms=1&room-0-adult-total=1&room-0-child-total=0&arrivalMonth=8&arrivalDay=18&departureMonth=8&departureDay=21&showInfo=true&locale=en_US&currencyCode=EUR",
"RoomRateDetailsList": {
"RoomRateDetails": {
"roomTypeCode": 200166353,
"rateCode": 201887482,
"maxRoomOccupancy": 1,
"quotedRoomOccupancy": 1,
"minGuestAge": 3,
"roomDescription": "Single Beds in Mixed Dormitory Room - Non refundable",
"currentAllotment": 8,
"propertyAvailable": true,
"propertyRestricted": false,
"expediaPropertyId": 4849100,
"rateKey": "0ABAAA83-04C7-5B91-40A2-754D72994DA3",
"RateInfo": {
"@rateChange": "false",
"@promo": "false",
"@priceBreakdown": "true",
"ChargeableRateInfo": {
"@total": "79.83",
"@surchargeTotal": "5.22",
"@nightlyRateTotal": "74.61",
"@maxNightlyRate": "24.87",
"@currencyCode": "EUR",
"@commissionableUsdTotal": "99.65",
"@averageRate": "24.87",
"@averageBaseRate": "24.87",
"NightlyRatesPerRoom": {
"@size": "3",
"NightlyRate": [
{
"@promo": "false",
"@rate": "24.87",
"@baseRate": "24.87"
},
{
"@promo": "false",
"@rate": "24.87",
"@baseRate": "24.87"
},
{
"@promo": "false",
"@rate": "24.87",
"@baseRate": "24.87"
}
]
},
"Surcharges": {
"@size": "1",
"Surcharge": {
"@amount": "5.22",
"@type": "TaxAndServiceFee"
}
}
}
},
"ValueAdds": {
"@size": "1",
"ValueAdd": {
"@id": "2048",
"description": "Free Wireless Internet"
}
}
}
}
}
}
}
}
采纳答案by Armen Arzumanyan
I summarized and used Hymanson here is a answer, maybe it will usefull for another people
我在这里总结并使用了 Hymanson 是一个答案，也许它对其他人有用
public void parseLink(String jsonObject) {
try {
ObjectMapper mapper = new ObjectMapper();
JsonFactory factory = mapper.getJsonFactory(); // since 2.1 use mapper.getFactory() instead
JsonParser jp = factory.createJsonParser(jsonObject);
JsonNode input = mapper.readTree(jp);
// final JsonNode results = input.get("HotelListResponse").get("HotelList").get("HotelSummary");
Iterator<Entry<String, JsonNode>> nodeIterator = input.get("HotelListResponse").getFields();
while (nodeIterator.hasNext()) {
Map.Entry<String, JsonNode> entry = (Map.Entry<String, JsonNode>) nodeIterator.next();
System.out.println("key --> " + entry.getKey() + " value-->" + entry.getValue());
}
Iterator<Entry<String, JsonNode>> nodeIterator1 = input.get("HotelListResponse").get("HotelList").getFields();
while (nodeIterator1.hasNext()) {
Map.Entry<String, JsonNode> entry = (Map.Entry<String, JsonNode>) nodeIterator1.next();
System.out.println("key --> " + entry.getKey() + " value-->" + entry.getValue());
}
Iterator<Entry<String, JsonNode>> nodeIterator2 = input.get("HotelListResponse").get("HotelList").get("HotelSummary").getFields();
while (nodeIterator2.hasNext()) {
Map.Entry<String, JsonNode> entry = (Map.Entry<String, JsonNode>) nodeIterator2.next();
System.out.println("key --> " + entry.getKey() + " value-->" + entry.getValue());
}
} catch (IOException ex) {
Logger.getLogger(HotelBean.class.getName()).log(Level.SEVERE, null, ex);
} catch (Exception e) {
e.printStackTrace();
}
}
回答by dcsohl
I'd use a library for this, something like http://json-lib.sourceforge.net/(others are out there; that's just the first one I found with a web search.)
我会为此使用一个库，例如http://json-lib.sourceforge.net/（其他人在那里；这只是我通过网络搜索找到的第一个。）
Unless of course, this is a school project or something and you need to write your own parser. In that case, perhaps you should come up with a more specific question and ask that instead of asking how to do everything.
当然，除非这是一个学校项目或其他什么，并且您需要编写自己的解析器。在这种情况下，也许您应该提出一个更具体的问题并提出这个问题，而不是询问如何做所有事情。
回答by Maxime
There are 2 libraries that I know for parsing JSON in Java : GSON and Hymanson. I know a little about Hymanson and it works in 3 ways :
我知道有 2 个库可用于在 Java 中解析 JSON：GSON 和 Hymanson。我对Hyman逊有一点了解，它以三种方式起作用：
- You can ask Hymanson to parse your JSON into an object
- You can read your JSON and load it in memory, so you can navigate in it.
- You can read your JSON like a stream
- 你可以让 Hymanson 把你的 JSON 解析成一个对象
- 您可以读取您的 JSON 并将其加载到内存中，以便您可以在其中导航。
- 您可以像流一样读取 JSON
Here is the link about these ways : http://wiki.fasterxml.com/HymansonInFiveMinutes
这是有关这些方式的链接：http: //wiki.fasterxml.com/HymansonInFiveMinutes
