POST 到 Google 云消息与改造

POST to Google Cloud Messaging with Retrofit

我正在使用 HttpURLConnection for POST message to GCM,例如:

try {
    URL url = new URL(GCM_SERVER_URL);

    HttpURLConnection conn = (HttpURLConnection) url.openConnection();

    conn.setRequestMethod("POST");
    conn.setRequestProperty("Content-Type", "application/json");
    conn.setRequestProperty("Authorization", "key=" + apiKey);
    conn.setDoOutput(true);

    ObjectMapper mapper = new ObjectMapper();
    mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);

    DataOutputStream dataOutputStream = new DataOutputStream(conn.getOutputStream());

    mapper.writeValue(dataOutputStream, content);

    dataOutputStream.flush();
    dataOutputStream.close();

    // Get the response
    int responseCode = conn.getResponseCode();
    System.out.println("\nSending 'POST' request to URL : " + url);
    System.out.println("Response Code : " + responseCode);

    BufferedReader in = new BufferedReader(
            new InputStreamReader(conn.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();

    System.out.println(response.toString());
} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

现在我想使用 RetrofitPOST 消息发送给 GCM
我试过:

@Headers("Content-Type: application/json")
@FormUrlEncoded
@POST("/")
public GCMObject GCMAuthorization(@Header("Authorization") String apiKey,
                                  @Body String data
);

我在 数据 中发送了 json 字符串,但它总是失败并出现此错误:

@Body parameters cannot be used with form or multi-part encoding.

我没有找到任何解决方案,我该如何解决?

@FormUrlEncoded用于发送表单参数。这些参数被编码为正文,您可以拥有自己的。它看起来不像你在使用和表单参数,所以删除 @FormUrlEncoded。此外,我建议使用 GSON 将您的 POJO 转换为 JSON 以用于 @Body。看起来您正在使用改造 1 并尝试发送原始 String。 Retrofit 将尝试 JSON 为您编码,这意味着您最终会收到包含在“...”中的发送对象。如果您想发送原始字符串,请查看 at this answer 改造 1 中的选项。