改造2.0b2：如何从响应中获取InputStream？

Question

我正在使用Retrofit 2.0b2。得到回复后，我尝试通过以下方式从响应中获取InputStream：

Response<JsonNode> response = call.execute();
InputStream is = response.raw().body().byteStream();

但应用程序不断抛出：

java.lang.IllegalStateException: Cannot read raw response body of a converted body.
        at retrofit.OkHttpCall$NoContentResponseBody.source(OkHttpCall.java:184)
        at com.squareup.okhttp.ResponseBody.byteStream(ResponseBody.java:43)
        at ...

尽管响应正确返回。我在这里做错了什么？

Answer 1

如果你想要原始流，请告诉改造返回OkHttp ResponseBody。

import okhttp3.ResponseBody;
import retrofit2.Response;

Response<ResponseBody> response = call.execute();
try ( ResponseBody responseBody = response.body() ) {
    InputStream is = responseBody.byteStream();
    // ...
}

请记住也要更新您的界面。

As the response body is backed by a limited resource, the responseBody object must be closed after usage。因此，上面的代码使用 try-with-resources 语句。