How Java uses Gson serialization and deserialization
Gson is a framework for serialization and deserialization between Java objects and JSON strings. It can convert Java objects into JSON strings and convert JSON strings into Java objects. Gson provides a simple and easy-to-use API that can handle complex object relationships and supports custom serialization and deserialization rules.
The common methods and example codes for Gson are as follows:
1. Create Gson object:
Gson gson = new Gson();
2. Convert the object to a JSON string (serialization):
MyObject obj = new MyObject();
String json = gson.toJson(obj);
Among them, 'MyObject' is the Java object that needs to be serialized.
3. Convert JSON strings to objects (deserialize):
String json = "{\"name\":\"John\",\"age\":30}";
MyObject obj = gson.fromJson(json, MyObject.class);
Among them, 'MyObject. class' is the class of the target object.
4. Custom serialization rules:
If you need to customize the serialization and deserialization rules for objects, you can implement the 'JsonSerializer' and 'JsonDeserializer' interfaces and register them in the Gson object.
class MyObjectSerializer implements JsonSerializer<MyObject> {
public JsonElement serialize(MyObject obj, Type typeOfSrc, JsonSerializationContext context) {
JsonObject json = new JsonObject();
json.addProperty("name", obj.getName());
json.addProperty("age", obj.getAge());
return json;
}
}
class MyObjectDeserializer implements JsonDeserializer<MyObject> {
public MyObject deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
throws JsonParseException {
JsonObject jsonObject = json.getAsJsonObject();
String name = jsonObject.get("name").getAsString();
int age = jsonObject.get("age").getAsInt();
return new MyObject(name, age);
}
}
Gson gson = new GsonBuilder()
.registerTypeAdapter(MyObject.class, new MyObjectSerializer())
.registerTypeAdapter(MyObject.class, new MyObjectDeserializer())
.create();
The above is the basic usage and example code for serialization and deserialization using Gson.
If you need to use Gson, you need to add the following Maven dependencies to the pom.xml file of the project:
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.7</version>
</dependency>
This will introduce the latest version of the Gson library.
