java - Android GSON - 使用 JSON 结构化对象的模板

Question

我的服务器响应 JSON 对象，始终包含相同的结构:

[int id, Error error, T result] 其中 result 是一种类型，具体取决于所调用的 JSON 方法。我正在尝试使用 GSON 进行反序列化，但在使用泛型时似乎遇到了问题。

private <T> T executeRequest(String methodName, Object[] params,
        Class<T> resultType) throws HttpException, IOException {
    final Gson gson = buildGson();
    final URL url = new URL(WEB_URL + methodName);


    final ZenfolioRequest request = new ZenfolioRequest();
    request.setMethod(methodName);
    request.setId(getNextRequestId());
    request.setParams(params);

    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod(POST);
    connection.setRequestProperty(USER_AGENT_PROPERTY, AGENT_NAME);
    connection.setRequestProperty(CONTENT_TYPE, APPLICATION_JSON);
    connection.setRequestProperty(ACCEPT, APPLICATION_JSON);
    connection.setDoOutput(true);
    connection.setDoInput(true);
    connection.setChunkedStreamingMode(0);
    connection.connect();

    final String toSend = gson.toJson(request);
    connection.getOutputStream().write(toSend.getBytes());
    if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {

        final InputStream in = new BufferedInputStream(
                connection.getInputStream());

        //String response = readResponseString(in);

        final T result = gson.fromJson(new InputStreamReader(in, UTF_8),
                resultType);
        return result;
    } else {
        throw new HttpException();
    }

}

示例方法:

@Override
public ZenfolioResponse<AuthChallenge> getChallenge(String loginName) {

    try {
        final String methodName = "GetChallenge";
        return executeRequest(methodName, new Object[] { loginName },
                new ZenfolioResponse<AuthChallenge>().getClass());
    } catch (Exception e) {
        Log.e(TAG, e.getMessage());
    }
    return null;
}


public class ZenfolioResponse<T>{

@SerializedName("id")
int id;
@SerializedName("error")
Error error;
@SerializedName("result")
T result;

public T getResult() {
    return result;
}
public void setResult(T result) {
    this.result = result;
}
public Error getError() {
    return error;
}
public void setError(Error error) {
    this.error = error;
}
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}

}

问题是对象 ZenfolioResponse 未正确填充结果正文。它不是类型化的，它是一个对象实例而不是 AuthChallenge 类型。

有人对如何调整这个有任何提示吗？

Answer 1

尝试使用 GSON 库中的 TypeToken。它将帮助您解析泛型类型。我在这里找到了例子: http://www.studytrails.com/java/json/java-google-json-serializing-classes-with-generic-type.jsp