Java 从json解析数据
JSON数据Java 从json解析数据,java,android,json,parsing,Java,Android,Json,Parsing,JSON数据 { "kind": "books#volumes", "totalItems": 111, "items": [{ "kind": "books#volume", "id": "wmMmkAFHlfAC", "etag": "m5G7DGubjpc", "selfLink": "https://www.googleapis.com/books/v1/volumes/wmMmkAFHlfAC",
{
"kind": "books#volumes",
"totalItems": 111,
"items": [{
"kind": "books#volume",
"id": "wmMmkAFHlfAC",
"etag": "m5G7DGubjpc",
"selfLink": "https://www.googleapis.com/books/v1/volumes/wmMmkAFHlfAC",
"volumeInfo": {
"title": "They!",
"authors": ["Chuck Keyes"],
"publisher": "Larry Larson",
"publishedDate": "2011-09-08",
"industryIdentifiers": [{
"type": "ISBN_13",
"identifier": "9781465704771"
},
{
"type": "ISBN_10",
"identifier": "1465704779"
}],
"readingModes": {
"text": true,
"image": true
},
"printType": "BOOK",
"categories": ["Fiction"],
"maturityRating": "NOT_MATURE",
"allowAnonLogging": false,
"contentVersion": "0.2.1.0.preview.3",
"panelizationSummary": {
"containsEpubBubbles": false,
"containsImageBubbles": false
},
"imageLinks": {
"smallThumbnail": "http://books.google.com/books/content?id=wmMmkAFHlfAC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api",
"thumbnail": "http://books.google.com/books/content?id=wmMmkAFHlfAC&printsec=frontcover&img=1&zoom=1&edge=curl&source=gbs_api"
},
"language": "en",
"previewLink": "http://books.google.co.in/books?id=wmMmkAFHlfAC&pg=PT220&dq=roses+inauthor:keyes&hl=&cd=1&source=gbs_api",
"infoLink": "http://books.google.co.in/books?id=wmMmkAFHlfAC&dq=roses+inauthor:keyes&hl=&source=gbs_api",
"canonicalVolumeLink": "https://books.google.com/books/about/They.html?hl=&id=wmMmkAFHlfAC"
},
"saleInfo": {
"country": "IN",
"saleability": "NOT_FOR_SALE",
"isEbook": false
},
"accessInfo": {
"country": "IN",
"viewability": "PARTIAL",
"embeddable": true,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": true,
"acsTokenLink": "http://books.google.co.in/books/download/They-sample-epub.acsm?id=wmMmkAFHlfAC&format=epub&output=acs4_fulfillment_token&dl_type=sample&source=gbs_api"
},
"pdf": {
"isAvailable": true,
"acsTokenLink": "http://books.google.co.in/books/download/They-sample-pdf.acsm?id=wmMmkAFHlfAC&format=pdf&output=acs4_fulfillment_token&dl_type=sample&source=gbs_api"
},
"webReaderLink": "http://play.google.com/books/reader?id=wmMmkAFHlfAC&hl=&printsec=frontcover&output=reader&source=gbs_api",
"accessViewStatus": "SAMPLE",
"quoteSharingAllowed": false
},
"searchInfo": {
"textSnippet": "She quickly returned with the bouquet of mixed colored \u003cb\u003eroses\u003c/b\u003e surrounded with \u003cbr\u003e\nbaby's breath. "These are mine! My husband has never given me such a beautiful \u003cbr\u003e\nbouquet of \u003cb\u003eroses\u003c/b\u003e." "Armed home invaders possessed by a deranged queen ..."
}
}]
}
private static List<Word> extractFeatureFromJson(String earthquakeJSON) {
// If the JSON string is empty or null, then return early.
if (TextUtils.isEmpty(earthquakeJSON)) {
return null;
}
// Create an empty ArrayList that we can start adding earthquakes to
List<Word> earthquakes = new ArrayList<>();
// Try to parse the JSON response string. If there's a problem with the way the JSON
// is formatted, a JSONException exception object will be thrown.
// Catch the exception so the app doesn't crash, and print the error message to the logs.
try {
// Create a JSONObject from the JSON response string
JSONObject baseJsonResponse = new JSONObject(earthquakeJSON);
// Extract the JSONArray associated with the key called "features",
// which represents a list of features (or earthquakes).
JSONArray earthquakeArray = baseJsonResponse.getJSONArray("items");
// For each earthquake in the earthquakeArray, create an {@link EarthquakeAdapter} object
for (int i = 0; i < earthquakeArray.length(); i++) {
// Get a single earthquake at position i within the list of earthquakes
JSONObject currentEarthquake = earthquakeArray.getJSONObject(i);
// For a given earthquake, extract the JSONObject associated with the
// key called "properties", which represents a list of all properties
// for that earthquake.
JSONObject properties = currentEarthquake.getJSONObject("volumeInfo");
// Extract the value for the key called "mag"
String location = currentEarthquake.getString("title");
double magnitude = currentEarthquake.getDouble("publishedDate");
// Extract the value for the key called "time"
long time = currentEarthquake.getLong("pageCount");
// Extract the value for the key called "url"
String url = currentEarthquake.getString("description");
// Create a new {@link EarthquakeAdapter} object with the magnitude, location, time,
// and url from the JSON response.
Word earthquake = new Word(magnitude, location, time, url);
// Add the new {@link EarthquakeAdapter} to the list of earthquakes.
earthquakes.add(earthquake);
}
} catch (JSONException e) {
// If an error is thrown when executing any of the above statements in the "try" block,
// catch the exception here, so the app doesn't crash. Print a log message
// with the message from the exception.
Log.e("QueryUtils", "Problem parsing the earthquake JSON results", e);
}
// Return the list of earthquakes
return earthquakes;
}
解析地震JSON结果org.JSON.JSONException时出现问题：title没有值据我所见，错误在根对象中，您尝试从中获取titlefrom 标题不是currentsearch的子项，而是volumeInfo的子项 应该是正确的 解析地震JSON结果org.JSON.JSONException时出现问题： 标题没有价值 请使用properties.getStringtitle而不是currentsearch.getStringtitle，并尝试使用下面的代码获取描述、页面计数、发布日期和缩略图 试试这个：
仅供参考，您的json中没有averageRating键。您应该使用谷歌的Gson：尝试在此处验证您的数据。您似乎没有检索到正确的json文件。您想解析哪些值？@FerdousAhamed我想解析imageLinks下的标题、说明、averageRating和缩略图。没有说明，附加JSON中的平均密钥。发布有效的json文件无效。仍然得到一个空白屏幕。Logcat现在在解析地震JSON结果org.JSON.JSONException时出现问题：PublishedDatayes没有值现在没有错误，但应用程序仍然显示空白列表视图。logcat或anywhere中没有错误，但应用程序不工作。请在代码中添加一些日志，以确保您从json获得正确的数据。如果可以的话，检查剩下的代码
// For a given earthquake, extract the JSONObject associated with the
// key called "properties", which represents a list of all properties
// for that earthquake.
JSONObject properties = currentEarthquake.getJSONObject("volumeInfo");
// Extract the value for the key called "mag"
String location = currentEarthquake.getString("title");
String location = properties.getString("title");
try {
JSONObject baseJsonResponse = new JSONObject(earthquakeJSON);
JSONArray earthquakeArray = baseJsonResponse.getJSONArray("items");
for (int i = 0; i < earthquakeArray.length(); i++) {
JSONObject currentEarthquake = earthquakeArray.getJSONObject(i);
JSONObject volumeInfo = currentEarthquake.getJSONObject("volumeInfo");
String title = volumeInfo.getString("title");
String publishedDate = volumeInfo.getString("publishedDate");
String description = volumeInfo.getString("description");
int pageCount = volumeInfo.getInt("pageCount");
JSONObject imageLinks = volumeInfo.getJSONObject("imageLinks");
String thumbnail = imageLinks.getString("thumbnail");
....................
..........................
}
} catch (JSONException e) {
// If an error is thrown when executing any of the above statements in the "try" block,
// catch the exception here, so the app doesn't crash. Print a log message
// with the message from the exception.
Log.e("QueryUtils", "Problem parsing the earthquake JSON results", e);
}