如何为 Gson 编写自定义 JSON 反序列化器? [英] How do I write a custom JSON deserializer for Gson?

问题描述

我有一个 Java 类，用户:

I have a Java class, User:

public class User
{
    int id;
    String name;
    Timestamp updateDate;
}

我收到一个包含来自网络服务的用户对象的 JSON 列表:

And I receive a JSON list containing user objects from a webservice:

[{"id":1,"name":"Jonas","update_date":"1300962900226"},
{"id":5,"name":"Test","date_date":"1304782298024"}]

我尝试编写自定义解串器:

I have tried to write a custom deserializer:

@Override
public User deserialize(JsonElement json, Type type,
                        JsonDeserializationContext context) throws JsonParseException {

        return new User(
            json.getAsJsonPrimitive().getAsInt(),
            json.getAsString(),
            json.getAsInt(),
            (Timestamp)context.deserialize(json.getAsJsonPrimitive(),
            Timestamp.class));
}

但是我的解串器不起作用.如何为 Gson 编写自定义 JSON 反序列化器?

But my deserializer doesn't work. How can I write a custom JSON deserializer for Gson?

推荐答案

@Override
public User deserialize(JsonElement json, Type type,
        JsonDeserializationContext context) throws JsonParseException {

    JsonObject jobject = json.getAsJsonObject();

    return new User(
            jobject.get("id").getAsInt(), 
            jobject.get("name").getAsString(), 
            new Timestamp(jobject.get("update_date").getAsLong()));
}

我假设 User 类具有适当的构造函数.

I'm assuming User class has the appropriate constructor.

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