我的JSON输出有什么问题？ConversionException

Question

我试图在一些json中使用retro fit，但看不出我的json字符串有什么问题，我总是得到同样的错误。

我在期待一个单词对象列表，但我错过了什么？有什么想法吗？

{
    "words": [
        {
            "id": "1",
            "word": "submarine",
            "word_syllables": "sub-mar-ine",
            "picture": "none.jpg",
            "picture_dir": "",
            "soundfile": "",
            "user_id": "1",
            "created": "2015-04-08 16:32:07",
            "modified": "0000-00-00 00:00:00"
        },
        {
            "id": "2",
            "word": "computer",
            "word_syllables": "com-pute-r",
            "picture": "computer.jpg",
            "picture_dir": "",
            "soundfile": "",
            "user_id": "0",
            "created": "2015-04-08 16:32:07",
            "modified": "0000-00-00 00:00:00"
        }
    ]
}

改造Android代码：

private void requestData(){

    RestAdapter adapter=new RestAdapter.Builder()
    .setEndpoint(ENDPOINT)
    .build();

    WordsAPI api=adapter.create(WordsAPI.class);

    api.getRestWordFeed(new Callback<List<Word>>(){

            @Override
            public void failure(RetrofitError arg0) {
                // TODO Auto-generated method stub
                Log.v("error",arg0.getMessage());
            }

            @Override
            public void success(List arg0, Response arg1) {
                // TODO Auto-generated method stub  
                wordList=arg0;
                printList();                    
            }
    });

}

API接口：

package com.example.testretrofitlib;

import java.util.List;

import retrofit.Callback;
import retrofit.http.GET;

public interface WordsAPI { 

    @GET("/rest_words/index.json")
    public void getRestWordFeed(Callback<List<Word>> response);


}

Answer 1

您的JSON是一个具有一个属性的对象:'words'，它是一个word对象数组。您的错误：“Expected BEGIN_ARRAY但was Begin_Object”表明您期望的是一个数组，但返回的是一个对象。一个解决方案是将以下内容作为JSON返回：

[
    {
        "id": "1",
        "word": "submarine",
        "word_syllables": "sub-mar-ine",
        "picture": "none.jpg",
        "picture_dir": "",
        "soundfile": "",
        "user_id": "1",
        "created": "2015-04-08 16:32:07",
        "modified": "0000-00-00 00:00:00"
    },
    {
        "id": "2",
        "word": "computer",
        "word_syllables": "com-pute-r",
        "picture": "computer.jpg",
        "picture_dir": "",
        "soundfile": "",
        "user_id": "0",
        "created": "2015-04-08 16:32:07",
        "modified": "0000-00-00 00:00:00"
    }
]