[英]Json, Java, Parsing (How to get only a part of json
我需要接收以下Json的“提取”部分: https ://en.wikipedia.org/w/api.php ? format = json & action = query & prop = extracts & exintro & explaintext & redirects =1& titles = turkey
使用我当前的代码,我得到了整个Json,并且真的不知道如何继续:
public class MainActivity extends AppCompatActivity {
private Button btnSendRequest;
private TextView tvText;
private RequestQueue mRequestQueue;
private StringRequest stringRequest;
private JsonObjectRequest jsonObjectRequest;
private String url = "https://de.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro&explaintext&redirects=1&titles=ilmenau";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnSendRequest = (Button) findViewById(R.id.btnSendRequest);
tvText = (TextView) findViewById(R.id.tvText);
btnSendRequest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//send request and print the response using volley library
sendRequestAndPrintResponse();
}
});
}
private void sendRequestAndPrintResponse() {
mRequestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest
(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
tvText.setText("Response : " + response.toString());
// Log.i(TAG,"Response : " + response.toString());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
tvText.setText("Error : " + error.toString());
//Log.i(TAG,"Error : " + error.toString());
}
});
mRequestQueue.add(jsonObjectRequest);
}
}
因此,当前我要收回整个Json,但我只需要获取Json的“提取”部分。 谁能帮我?
尝试这个
try {
JSONObject jsonObject = new JSONObject(response.toString());
Iterator < String > keys = jsonObject.keys();
while (keys.hasNext()) {
String key = keys.next();
String value = jsonObject.getString(key);
Log.v("key", key);
Log.v("value", value);
if (key.equals("query")) {
JSONObject jsonObject1 = new JSONObject(jsonObject.getString(key));
Iterator < String > keysinner = jsonObject1.keys();
while (keysinner.hasNext()) {
String key1 = keysinner.next();
String value1 = jsonObject1.getString(key1);
Log.e("key1", key1);
Log.e("value1", value1);
if (key1.equals("pages")) {
JSONObject jsonObject2 = new JSONObject(jsonObject1.getString(key1));
Iterator < String > keyPagenumber = jsonObject2.keys();
while (keyPagenumber.hasNext()) {
String keyPageNumber = keyPagenumber.next();
String valuePagenumber = jsonObject2.getString(keyPageNumber);
Log.e("Pages key :", keyPageNumber);
Log.e("Pages value :", valuePagenumber);
if (key1.equals("pages")) {
JSONObject jsonObjectPages = new JSONObject(jsonObject2.getString(keyPageNumber));
Iterator < String > keyPages = jsonObjectPages.keys();
while (keyPages.hasNext()) {
String keyPageDetail = keyPages.next();
String valuePageDetail = jsonObjectPages.getString(keyPageDetail);
Log.e("PagesDetail key :", keyPageDetail);
Log.e("PagesDetail value :", valuePageDetail);
}
}
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
输出值
使用GSON库!
因此,假设您将jsonObjectRequest
的整个json内容jsonObjectRequest
为一个字符串,我将其命名为theWholeContentOfYourJsonObjectRequestAsAString
JsonParser parser = new JsonParser();
JsonElement jsonTree = parser.parse(theWholeContentOfYourJsonObjectRequestAsAString);
JsonObject jsonObject = jsonTree.getAsJsonObject();
JsonElement f1 = jsonObject.get("extract");
就像是
JSONObject pages = response.getJSONObject("query").getJSONObject("pages");
JSONObject firstPage = pages.getJSONObject(pages.names().get(0));
String extract = firstPage.getString("extract");
应该管用。
要提取一个JSON对象(另一个JSON对象,Integer,String等),您不必使用任何外部库,例如GSON。 您可以使用以下代码进行管理。
JSONObject jObj = new JSONObject(response);
String InterestString = jObj.getJSONObject("local").getString("interests");
私人无效sendRequestAndPrintResponse(){
mRequestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest
(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject query = response.getJSONObject("query");
JSONObject pages = query.getJSONObject("pages");
JSONObject nos = pages.getJSONObject("11125639");
String extract = nos.getString("extract");
Log.e(TAG, "onResponse: " + extract);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
tvText.setText("Error : " + error.toString());
//Log.i(TAG,"Error : " + error.toString());
}
});
mRequestQueue.add(jsonObjectRequest);
}
修改代码,像这样添加这些行,您应该提取
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