【史上最简单】头条项目中使用到的json解析

来源：互联网发布：dede淘宝客api采集编辑：程序博客网时间：2024/06/06 01:58

在项目使用到json解析网址返回的json格式数据，我的网络访问使用的是retrofit2.0框架，它里面自带了json转换成object转换器，当然，可以自己自定义转换器。
其实，转换器也是基于最基础json的string文本来不断的解析转换，封装而成的，所以我们最好搞懂最基础的转换方法。
我的数据是聚合数据：
https://www.juhe.cn/box/index/id/235
比如：

{    "reason":"成功的返回",    "result":{        "stat":"1",        "data":[            {                "uniquekey":"9acb533ba0f54242743fa9128a4d6ab3",                "title":"不惧怕任何国家！中国进行国土防御作战完全没有压力！",                "date":"2017-05-26 16:30",                "category":"军事",                "author_name":"军刀",                "url":"http:\/\/mini.eastday.com\/mobile\/170526163040904.html",                "thumbnail_pic_s":"http:\/\/08.imgmini.eastday.com\/mobile\/20170526\/20170526163040_8c883638d210ad10b70cd17679f2f3b3_2_mwpm_03200403.jpeg",                "thumbnail_pic_s02":"http:\/\/08.imgmini.eastday.com\/mobile\/20170526\/20170526163040_8c883638d210ad10b70cd17679f2f3b3_3_mwpm_03200403.jpeg",                "thumbnail_pic_s03":"http:\/\/08.imgmini.eastday.com\/mobile\/20170526\/20170526163040_8c883638d210ad10b70cd17679f2f3b3_4_mwpm_03200403.jpeg"            },            {                "uniquekey":"9dfb9216a9767ed36665f778eb2cdfb2",                "title":"同方威视华沙公司喜获波兰最具活力中小型企业奖",                "date":"2017-05-26 16:20",                "category":"军事",                "author_name":"中国网",                "url":"http:\/\/mini.eastday.com\/mobile\/170526162000174.html",                "thumbnail_pic_s":"http:\/\/06.imgmini.eastday.com\/mobile\/20170526\/20170526162000_d100909589f10e7972b6715a43a0a66a_1_mwpm_03200403.jpeg"            },            {                "uniquekey":"30a6ccf5ec03c3166b737b25f369457a",                "title":"普京手下两大“海军”浩浩荡荡奔赴战场 海军携带的这只猫很不简单",                "date":"2017-05-26 16:16",                "category":"军事",                "author_name":"军情图解",                "url":"http:\/\/mini.eastday.com\/mobile\/170526161634427.html",                "thumbnail_pic_s":"http:\/\/07.imgmini.eastday.com\/mobile\/20170526\/20170526161634_233fd32f75522e6f80b6eee7cbba6ad0_3_mwpm_03200403.jpeg",                "thumbnail_pic_s02":"http:\/\/07.imgmini.eastday.com\/mobile\/20170526\/20170526161634_233fd32f75522e6f80b6eee7cbba6ad0_4_mwpm_03200403.jpeg",                "thumbnail_pic_s03":"http:\/\/07.imgmini.eastday.com\/mobile\/20170526\/20170526161634_233fd32f75522e6f80b6eee7cbba6ad0_2_mwpm_03200403.jpeg"            }        ]    },    "error_code":0}

通常返回的json格式和这个类型，复杂一点的无非各种嵌套出来的。。。
我们要做的就是一层一层解析再转换。

我的代码访问使用了retrofit：

{        Log.d("lihui", "List<Data> list---" + list);        //1        Retrofit retrofit = new Retrofit.Builder().                baseUrl("http://v.juhe.cn/").                addConverterFactory(GsonConverterFactory.create()).build();        //2        HttpService myService = retrofit.create(HttpService.class);        //3        retrofit.Call<ResponseBody> call = myService.getData(type, "9f3097f4cbe47e8abb01ca3b92e49cda");        //4        call.enqueue(new Callback<ResponseBody>() {            @Override            public void onResponse(Response<ResponseBody> response, Retrofit retrofit) {                Log.d("lihui", "123onResponse");                try {                    ResponseBody httpResult = response.body();                    //原始数据下手                    String result = httpResult.string();                    org.json.JSONObject jsonObject = new org.json.JSONObject(result);                    String reason = jsonObject.getString("reason");                    ToastUtils.setToastText(context, reason);                    String result2 = jsonObject.getString("result");                    org.json.JSONObject jsonObject2 = new org.json.JSONObject(result2);                    String stat = jsonObject2.getString("stat");                    String data = jsonObject2.getString("data");                    org.json.JSONArray jsonArray2 = new org.json.JSONArray(data);                    list.clear();                    for (int i = 0; i < jsonArray2.length(); i++) {                        //获取每一个JsonObject对象                        org.json.JSONObject myjObject = jsonArray2.getJSONObject(i);                        if (myjObject != null) {                            Data data1 = new Data(myjObject);                            Log.d("lihui", "Fragment onResponse getUniquekey---" + data1.getUniquekey());                            Log.d("lihui", "Fragment onResponse data---" + data1);                            list.add(data1);                        }                    }                    if (list != null && list.size() > 0 && mHandler != null) {                        Message msg = mHandler.obtainMessage();                        msg.what = 0;                        msg.obj = list;                        mHandler.sendMessage(msg);                        empty.setVisibility(View.GONE);                        cacheMap.put(type, list);                    }                    Log.d("lihui", "159 list---" + list);                } catch (Exception e) {                    Log.d("lihui", "114e---" + e.getMessage());                    pullToRefreshRecyclerView.onRefreshComplete();                }            }            @Override            public void onFailure(Throwable t) {                Log.d("lihui", "165t:" + t.getMessage());                t.printStackTrace();                Message msg = mHandler.obtainMessage();                msg.what = 1;                msg.obj = type;                mHandler.sendMessage(msg);            }        });        return list;    }

1、拿到最原始数据，服务器直接返回的 { xxxxx }
转换成一个jsonObject

 org.json.JSONObject：这个是api自带的                    org.json.JSONObject jsonObject = new org.json.JSONObject(result);

2、拿到第二层对象result2 ，转换成jsonObject。

       String reason = jsonObject.getString("reason");                    ToastUtils.setToastText(context, reason);                    String result2 = jsonObject.getString("result");                                        org.json.JSONObject jsonObject2 = new org.json.JSONObject(result2);

3、继续拿第三层data，也是一个子对象。
这个对象可以看成是一个数组对象，jsonArray2 里面有多个元素！！！

   String stat = jsonObject2.getString("stat");                    String data = jsonObject2.getString("data");                    org.json.JSONArray jsonArray2 = new org.json.JSONArray(data);

4、第四层，数组里面每个元素也是一个jsonobject对象。拿出来
org.json.JSONObject myjObject = jsonArray2.getJSONObject(i);

  for (int i = 0; i < jsonArray2.length(); i++) {                        //获取每一个JsonObject对象                        org.json.JSONObject myjObject = jsonArray2.getJSONObject(i);                        if (myjObject != null) {                            Data data1 = new Data(myjObject);                            Log.d("lihui", "Fragment onResponse getUniquekey---" + data1.getUniquekey());                            Log.d("lihui", "Fragment onResponse data---" + data1);                            list.add(data1);                        }                    }

好了，学会这个json格式的解析，应该没有什么可以难倒我们了吧，一层一层解析，这里最主要的方法如下：

org.json.JSONObject ：这个类，sdk自带jsonObject.getString("reason");org.json.JSONArray jsonArray2 = new org.json.JSONArray(data);循环： for (int i = 0; i < jsonArray2.length(); i++) {                        //获取每一个JsonObject对象                        org.json.JSONObject myjObject = jsonArray2.getJSONObject(i);                        if (myjObject != null) {                            Data data1 = new Data(myjObject);                            Log.d("lihui", "Fragment onResponse getUniquekey---" + data1.getUniquekey());                            Log.d("lihui", "Fragment onResponse data---" + data1);                            list.add(data1);                        }                    }

最后咱们拿到这个jsonobject对象，就可以自己自定义object了，构造初始化：

  public Data(JSONObject jsonObject) throws  Exception{        this.title=jsonObject.getString("title");        this.date=jsonObject.getString("date");        this.author_name=jsonObject.getString("author_name");        this.thumbnail_pic_s=jsonObject.getString("thumbnail_pic_s");        //this.thumbnail_pic_s02=jsonObject.getString("thumbnail_pic_s02");        //this.thumbnail_pic_s03=jsonObject.getString("thumbnail_pic_s03");        this.url=jsonObject.getString("url");   //     this.uniquekey=jsonObject.getString("uniquekey");    }

结束~~~~~~~~~~~·

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