android spring httprequest上的JsonMappingException

Question

我在异步任务中有这个调用。所有参数都正确。在postman或高级rest客户机中，调用工作正常，它返回一个带有对象列表的json。但是如果我尝试用spring在android中执行这个调用，我会出现这样的错误：

org.springframework.http.converter.httpMessageNotreadableException：无法读取JSON：无法从START_OBJECT令牌反序列化java.lang.String实例[source:org.apache.http.conn.eofsensorInputStream@1961b5e；行：1,列：1]；嵌套异常是com.fasterxml.jackson.databind.jsonMappingException：无法从[source:org.apache.http.conn.eofsensorinputstream@1961b5e；line:1,column:1]处的START_OBJECT令牌反序列化java.lang.string实例

[
{
    "id": 57,
    "user_id": 2,
    "category_id": 5,
    "notification_title": "test 9",
    "notification_body": "breve 9",
    "description": "Sd sdfds sdfs dfsd fdsf",
    "image": null,
    "code": "2-5942525969dfa",
    "start_date": null,
    "expiration_date": null,
    "created_at": "2017-06-15 09:24:41",
    "updated_at": "2017-06-15 09:24:41"
},
{
    "id": 56,
    "user_id": 2,
    "category_id": 4,
    "notification_title": "test 8",
    "notification_body": "breve desc 8",
    "description": "Sdfsdf sdfds dsfs dsfds",
    "image": null,
    "code": "2-59424e24570a2",
    "start_date": null,
    "expiration_date": null,
    "created_at": "2017-06-15 09:06:44",
    "updated_at": "2017-06-15 09:06:44"
}]

这是我的AsyncTask

new AsyncTask<Void, Void, String>() {
        @Override
        protected String doInBackground(Void... params) {

            JSONObject body = new JSONObject();

            try {
                body.put("api_token", Config.API_TOKEN);
                body.put("user_id", Config.USER_ID);
            } catch (JSONException e) {
                e.printStackTrace();
            }

            try {
                return template.postForObject(
                        Config.SERVICE_URL_BASE + "/getallposts",
                        body.toString(),
                        String.class
                );
            } catch (Exception e) {
                listener.onError(e.getMessage());
            }

            return null;
        }

        @Override
        protected void onPostExecute(String response) {
            if (response != null) {
                try {
                    List<JSONObject> jsonObjects = ResponseConverter.toJSONArray(response);
                    listener.onSuccess(jsonObjects);
                } catch (JSONException e) {
                    listener.onError(context.getResources().getString(R.string.cannot_load_posts));
                }
            } else {
                listener.onError(context.getResources().getString(R.string.cannot_load_posts));
            }
        }

    }.execute();

谁能帮帮我吗？

Answer 1

问题解决了，spring framework rest tempolate版本是错误的，我使用了1.0.1版本，但正确的版本是：

    compile 'org.springframework.android:spring-android-rest-template:2.0.0.M3'