How to convert Json to Java object using Gson [duplicate]
Try this: Gson gson = new Gson(); String jsonInString = “{\”userId\”:\”1\”,\”userName\”:\”Yasir\”}”; User user= gson.fromJson(jsonInString, User.class);
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Gson to json conversion with two DateFormat
I was facing the same issue. Here is my solution via custom deserialization: new GsonBuilder().registerTypeAdapter(Date.class, new DateDeserializer()); private static final String[] DATE_FORMATS = new String[] { “MMM dd, yyyy HH:mm:ss”, “MMM dd, yyyy” }; private class DateDeserializer implements JsonDeserializer<Date> { @Override public Date deserialize(JsonElement jsonElement, Type typeOF, JsonDeserializationContext context) throws JsonParseException { for (String format … Read more
Gson Serialize field only if not null or not empty
Create your own TypeAdapter public class MyTypeAdapter extends TypeAdapter<TestObject>() { @Override public void write(JsonWriter out, TestObject value) throws IOException { out.beginObject(); if (!Strings.isNullOrEmpty(value.test1)) { out.name(“test1”); out.value(value.test1); } if (!Strings.isNullOrEmpty(value.test2)) { out.name(“test2”); out.value(value.test1); } /* similar check for otherObject */ out.endObject(); } @Override public TestObject read(JsonReader in) throws IOException { // do something similar, but the … Read more
What is the purpose of using @field:SerializedName annotation instead of @SerializedName?
TL;DR: The field: part is known as a “use-site target”, and makes it clear that the annotation is applied to the backing field of the Kotlin property. It is not strictly necessary in this case, though it can make the code more readable. Explanation To simplify, let’s say you have: data class Repo( @field:SerializedName(“name”) var … Read more
Deserializing classes with lazy properties using Gson and Kotlin 1.0 beta 4
Since Kotlin 1.0 simply mark the field like this to ignore it during de/serialization: @delegate:Transient val field by lazy { … }
Gson Array of Strings to JsonArray
You can create a primitive that will contain the String value and add it to the array: JsonArray jArray = new JsonArray(); JsonPrimitive element = new JsonPrimitive(“value1”); jArray.add(element);
Why do I get Gson builder error when starting a Spring Boot application?
I would write this as a comment, but I still haven’t got enough rep. The problem must be with your dependencies. What happens here is that SpringBoot loads the GsonAutoConfiguration @Configuration class, which tries to call GsonBuilder‘s setLenient() method. SpringBoot already has the correct gson jar set as a dependency which should automatically be included … Read more
Gson custom deseralizer for one variable in an object
You need to register a custom type adapter for the Apple type. In the type adapter, you will add logic to determine if you were given an array or a single object. Using that info, you can create your Apple object. In adition to the below code, modify your Apple model object so that the … Read more