![]() ![]() Since you seem to be flexible in choice of JSON parsing library I would suggest Jackson 2 from com.fasterxml instead of Jackson 1 from org.codehaus that you tried. Basically with findValue you can get another node deep into the tree, with get you can get array elements by index and with asText etc you parse a value in JSON into the appropriate type in Java. Assuming the order of ColumnNames is fixed then you can parse with Jackson like this: final ObjectMapper mapper = new ObjectMapper() įinal JsonNode tree = mapper.readTree(json) įinal JsonNode values = tree.findValue("Values") įinal ClientPOJO client = new ClientPOJO() ĬtDocumentId(node.get(1).asText()) ĬtScoredLabels(node.get(2).asBoolean()) ĬtScoredProbabilities(node.get(3).asDouble()) ĭocs for JsonNode. You can achieve this by getting the raw tree of data in this JSON and constructing objects by iterating over the Values array inside this tree. Neither Jackson nor any other library will parse the Values array into objects with client data like your POJO. HashMap map = omJson("your_json_string_here", type) ![]() I try it like this: public class ClientPOJO. The best case for me would be something like this, which I've done in another case: String uId = (String) attr.get("userId") String CN = (String) map.get("ColumnNames") īut then I get the following error: Exception in thread "main" : Unexpected character ('A' (code 65)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') I have tried it with something like this: Map map = mapper.readValue(filename, Map.class) "Values":, ]Īnd I want to have only the ColumnNames and the Values. public class Departmentĭrop me your question related to gson parse JSON array to java lists and arrays."ColumnNames": , Java program to deserialize JSON array as member object – to Java list of objects a member field. public class Departmentĭepartment department = omJson(departmentJson, Department.class) Java program to deserialize JSON array as member object – to Java array of objects as member field. ![]() We can use the fromJson() method in the usual manner and it will parse the JSON array correctly to the required java array or list. Gson parses JSON arrays as members without difficulty if they are non-root objects. Type listType = new TypeToken>().getType() ĪrrayList userArray = omJson(userJson, userListType) ArrayItem userArray = new Gson().fromJson(jsonSource, ArrayItem.class) įor converting such JSON array to a List, we need to use TypeToken class. Here ArrayItem is the class type of data elements in the array. You can use this single line to convert to any object even your own declared objects. (in this example - Map) There are 2 advantages with this approach: The flexibility to pass any Object instead of String to toJson method. To parse JSON, with array as root, we can use the following method syntax. omJson will convert the Json string to specified object. String json '.' final ObjectMapper mapper new ObjectMapper () final InputStream in new ByteArrayInputStream (json.getBytes ()) final JsonPatch patch mapper.readValue (in, JsonPatch. It’s worth mentioning that JSON has only array datatype. Based on JSON Patch documentation, you can build a JsonPatch instance using Jackson deserialization. Learn to use Google GSON library to deserialize or parse a JSON array to a Java array or List object. ![]()
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