Question

我可以获取部分名称，网址和标题，但我无法从解析json获取最后修改日期此代码为Json

＆＃13;

{  
   "response":{  
      "status":"ok",
      "userTier":"developer",
      "total":368,
      "startIndex":1,
      "pageSize":10,
      "currentPage":1,
      "pages":37,
      "orderBy":"relevance",
      "results":[  
         {  
            "id":"technology/2017/may/24/fitness-trackers-out-of-step-when-measuring-calories-research-shows",
            "type":"article",
            "sectionId":"technology",
            "sectionName":"Technology",
            "webPublicationDate":"2017-05-24T15:00:24Z",
            "webTitle":"Fitness trackers out of step when measuring calories, research shows",
            "webUrl":"https://www.theguardian.com/technology/2017/may/24/fitness-trackers-out-of-step-when-measuring-calories-research-shows",
            "apiUrl":"https://content.guardianapis.com/technology/2017/may/24/fitness-trackers-out-of-step-when-measuring-calories-research-shows",
            "fields":{  
               "headline":"Fitness trackers out of step when measuring calories, research shows",
               "lastModified":"2017-05-24T15:02:19Z",
               "thumbnail":"https://media.guim.co.uk/8d3e17604195078ec89e20329e2ddc5027eca8ea/0_213_6362_3817/500.jpg"
            },
            "isHosted":false
         },

＆＃13;

这是我解析它的代码。

JSONObject response = root.getJSONObject（＆＃34; response＆＃34;）;

        if(response.has("results")){

            JSONArray results = response.getJSONArray("results");
            for(int i=0;i<results.length();i++){
                long lastModified=0;
                String headline=null;
                JSONObject details=results.getJSONObject(i);
                String sectionName=details.getString("sectionName");
                Log.i(LOG_TAG,sectionName);
                String webUrl=details.getString("webUrl");
                Log.i(LOG_TAG,webUrl);
                if(details.has("fields")){
                JSONObject fields=details.getJSONObject("fields");
                    if(fields.has("headline")){

                 headline =fields.getString("headline");
                Log.i(LOG_TAG,headline);}
                if(fields.has("lastModified")){
                 lastModified =fields.getLong("lastModified");
                Log.i(LOG_TAG, String.valueOf(lastModified));}}

我不知道为什么不能获得最后修改日期？

Answer 1

你可以解析Json并获得像这样的lastModified，

public static void parse(String response) {
    try {
        JSONObject baseObject = new JSONObject(response);

        if (baseObject == null) {
            return;
        }

        JSONObject responseObj = baseObject.optJSONObject("response");

        if (response == null) {
            return;
        }

        JSONArray resultsArray = responseObj.getJSONArray("results");

        if (resultsArray == null) {
            return;
        }

        for (int i = 0; i < resultsArray.length(); i++) {
            JSONObject resultObj = resultsArray.getJSONObject(i);

            if (resultObj == null) {
                continue;
            }

            String id = resultObj.optString("id", "");
            String type = resultObj.optString("type", "");
            String sectionId = resultObj.optString("sectionId", "");
            String sectionName = resultObj.optString("sectionName", "");
            String webPublicationDate = resultObj.optString("webPublicationDate", "");
            String webTitle = resultObj.optString("webTitle", "");
            String webUrl = resultObj.optString("webUrl", "");
            String apiUrl = resultObj.optString("apiUrl", "");
            boolean isHosted = resultObj.optBoolean("isHosted", false);

            JSONObject fieldsObj = resultObj.optJSONObject("fields");

            if (fieldsObj == null) {
                 continue;
            }

            String headline = fieldsObj.optString("headline", "");
            String lastModified = fieldsObj.optString("lastModified", "");
            String thumbnail = fieldsObj.optString("thumbnail", "");
        }

    } catch (JSONException e) {
        e.printStackTrace();
    }
}

将日期转换为特定格式

public static String getDateFromatedString(String inputDate) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssz");

    Date date = null;
    try {
        date = simpleDateFormat.parse(inputDate);
    } catch (ParseException e) {
        e.printStackTrace();
    }

    if (date == null) {
        return "";
    }

    SimpleDateFormat convetDateFormat = new SimpleDateFormat("yyyy-MM-dd");

    return convetDateFormat.format(date);
}

Answer 2

该DateTime格式实际上是ISO 8601 DateTime。 JSON没有为日期/时间指定任何特定格式。如果你有点谷歌，你会发现很多实现用Java来解析它。

Here's one

如果您愿意使用Java内置的日期/时间/日历类以外的东西，我还建议使用Joda Time。它们（在许多方面）提供了一个ISODateTimeFormat来解析这些类型的字符串。

Answer 3

您正在使用lastModified =fields.getLong("lastModified"); 你应该使用getString()，因为你的lastModified日期是String 类型。

Answer 4

这是我更新的代码，但没有改变

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Answer 5

这个java类

public class News {
private  String mTitle;
private String mSectionName;
private String mUrl;
private String mDate;
// constructor  of news`

 public News(String title,String sectionName,String date,String url){
    mTitle =title;
    mSectionName=sectionName;
    mDate=date;
    mUrl=url;}
public  News(String title,String sectionName){ mTitle =title;
    mSectionName=sectionName;}
// get methods.
public String getmTitle(){return mTitle;}
public String getmSectionName(){return mSectionName;}
public String getmUrl(){return mUrl;}

public String getmDate() {
    return mDate;}}

无法从Json修改日期

5 个答案: