I created a JSON file with JAVA.
Now I want to search a String in the JSON file.
JSONObject root = new JSONObject();
JSONObject courseObject1 = new JSONObject();
courseObject1.put("name", "MEA");
courseObject1.put("author", "Mn");
root.put("object", courseObject1);
//------------------------------------
JSONObject courseObject2 = new JSONObject();
courseObject2.put("name", "MES");
courseObject2.put("author", "Ma");
root.put("object2", courseObject2);
I want to know in which courseObject is "MES".
(Maby in the finish programm are more courseObjects)
You can proceed as follows:
for(int i = 0; i < root.length(); i++) {
JSONObject obj = root.getJSONObject(i);
if(obj.getString("name").equals("MES")) {
// Do something with the course
}
}
i wanted to know how I can convert this string here to an array:
[{"title":"test","birth":"20.05"},{"title":"test","birth":"13.05"},{"title":"test","birth":"13.06"},{"title":"test","birth":"23.06"},{"title":"test","birth":"01.12"},{"title":"test","birth":"01.06"}]
I already found this here:
JSONObject jsnobject = new JSONObject(readlocationFeed);
JSONArray jsonArray = jsnobject.getJSONArray("locations");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject explrObject = jsonArray.getJSONObject(i);
But if I try to make the object I always get null. And here:
JSONArray jsonArray = jsnobject.getJSONArray("locations");
I don't know what I should enter as "locations". Should I enter "[]" ?
Thanks really much for help!
Daniel
I don't know what I should enter as "locations". Should I enter "[]" ?
Nothing readlocationFeed is already a JSONArray. You just need
JSONArray jsonArray = new JSONArray(readlocationFeed);
without
JSONObject jsnobject = new JSONObject(readlocationFeed);
JSONArray jsonArray = jsnobject.getJSONArray("locations");
Shouldn't it be the other way around?
JSONArray jsnArray = new JSONArray(readlocationFeed);
Anyway I suggest you should use GSON for this kind of problem:
Gson gson = new Gson();
MyClass[] arr = gson.fromJson(str, MyClass[].class);
class MyClass{
double birth;
String title;
}
i am trying to call an URL and afterwards to save the results of the URL into a database.
The call of the URL is working and i also am able to save the result into JSON objects/arrays.
This is my code so far:
JSONParser parser = new JSONParser();
try
{
// responseString is the answer i get from calling the URL.
// It's pretty long that's why i don't copy it in here now
// But you can call this URL to see what the result is:
// http://www.gw2spidy.com/api/v0.9/json/items/all/1?filter_ids=29169,29185
Object objToParse = parser.parse(responseString);
JSONObject jsonObject = (JSONObject) objToParse;
JSONArray array = (JSONArray) jsonObject.get("results");
// Until here everything is ok, the results get saved into the array
JSONObject mJsonObject = new JSONObject();
for (int i = 0; i < array.length() ; i++)
{
mJsonObject = (JSONObject)array.get(i);
System.out.println(mJsonObject);
}
}
catch(ParseException pe)
{
System.out.println("position: " + pe.getPosition());
System.out.println(pe);
}
When i try to run this i get an error when i try to loop through the array:
Exception in thread "main" java.lang.ClassCastException: org.json.simple.JSONArray cannot be cast to java.lang.CharSequence
I already searched for solutions but i cannot find or understand what is causing the error for me, would be nice if someone can help me here..
Ok at the end this was working for me:
JSONObject jsonObject = new JSONObject(responseString);
JSONArray array = (JSONArray) jsonObject.get("results");
JSONObject mJsonObject = new JSONObject();
for (int i = 0; i < array.length() ; i++)
{
mJsonObject = (JSONObject)array.get(i);
System.out.println(mJsonObject);
}
Had to change org.json.simple to instead use org.json and changed some lines then it was working.
I rather think that your implementation using simple json was wrong.
Although you didn't mention exactly, the only place your Exception could happen would be the line
JSONArray array = (JSONArray) jsonObject.get("results");
and as this is the same in both implementations, something previous to that must have happened leading to a situation with simple json where the results property is not a JSONArray. Probably something with parser.parse(...).
I have a JSON String and I got the data element's data to JSONObject. After I read this that resultant string is as follows. I'm using org.json library.
String dataStr = "[{\"name\":\"jhonny\",\"counts\":[\"50\",\"44\",\"46\"],\"url\":\"google\"},
{\"name\":\"john\",\"counts\":[\"344\",\"4\",\"18\"],\"url\":\"yahoo\"}]";
I tried to read the each element like following,
String dataStr = report.get("data").toString();
JSONObject data = new JSONObject(dataStr.substring(1));
System.out.println(data);
But my output is,
{"name":"jhonny","counts":["50","44","46"],"url":"google"}
The output contains only one element. How can I fix this?
JSONArray jsonarray = new JSONArray(datastr);
for(int i=0; i<jsonarray.length(); i++){
JSONObject data= jsonarray.getJSONObject(i);
System.out.println(data);
}
Using the org.json library:
JSONObject obj = new JSONObject("{interests : [{interestKey:Dogs}, {interestKey:Cats}]}");
List<String> list = new ArrayList<String>();
JSONArray array = obj.getJSONArray("interests");
for(int i = 0 ; i < array.length() ; i++){
list.add(array.getJSONObject(i).getString("interestKey"));
}
The problem is you are trying to read JSONArray as JSONObject.
To parse JSONArray you need to do something like: (Not sure which library you are using)
for (int i = 0; i < jsonarray.length(); i++) {
JSONObject jsonobject = jsonarray.getJSONObject(i);
// jsonobject holds the desired element.
}
If you analyze your json string, you will notice that your json string contains multiple json object without outer object like :-
{
"outer":{
{\"name\":\"jhonny\",\"counts\":[\"50\",\"44\",\"46\"],\"url\":\"google\"},
{\"name\":\"jhonny\",\"counts\":[\"50\",\"44\",\"46\"],\"url\":\"google\"}
}
}
The way you are parsing require this kind of json structure. Your json string is actually just a jsonarray. So do like this way :
JSONArray jsonarray = new JSONArray(datastr);
for(int i=0; i<jsonarray.length(); i++){
JSONObject data= jsonarray.getJSONObject(i);
}
For more you can visit this link that gives you good explanation to how to read json in java
This is my JSON data.
{"JSONDATA":[{"key":0,"value":"--Any--"},{"key":61,"value":"Accounting"},{"key":81,"value":"Aerospace & Defense"},{"key":72,"value":"Automotive"},{"key":83,"value":"Banking"},{"key":84,"value":"Biotech"},{"key":85,"value":"Construction"},{"key":86,"value":"Customer Service"},{"key":87,"value":"Education"},{"key":82,"value":"Energy"},{"key":70,"value":"Finance"},{"key":193,"value":"Government"},{"key":194,"value":"Healthcare"},{"key":71,"value":"Insurance"},{"key":73,"value":"Legal"},{"key":62,"value":"Management"},{"key":63,"value":"Manufacturing"},{"key":64,"value":"Marketing\/Advertising"},{"key":77,"value":"Media - Journalism"},{"key":74,"value":"Pharmaceutical"},{"key":75,"value":"Real Estate"},{"key":76,"value":"Research"},{"key":65,"value":"Restaurant"},{"key":66,"value":"Retail"},{"key":67,"value":"Sales"},{"key":78,"value":"Science"},{"key":68,"value":"Telecommunications"},{"key":79,"value":"Training"},{"key":69,"value":"Transportation"},{"key":80,"value":"Utilities"}]}
I want to decode it on my Android App, This is the code i have used., But i don't get anything on my output. No errors too.
JSONObject jObject= new JSONObject();
JSONArray menuObject = new JSONArray(jObject.getString("JSONDATA"));
String app;
for (int i = 0; i<menuObject.length(); i++) {
{
app=menuObject.getJSONObject(i).getString("value").toString();
a.append(app); // a is my TextView
}
First off, you're not initializing your jObject with anything.
//pass in string
JSONObject jObject= new JSONObject(jsonString);
JSONObjects need something to parse, otherwise (the way you have it now) they initialize with no data, which isn't very helpful.
Secondly, you're using getString when you really want an array:
JSONArray menuObject = jObject.getJSONArray("JSONDATA");
getString is designed to return a piece of string data from a JSON object. "JSONDATA" holds an array, so we need to choose the correct type to retrieve.
Thirdly, you have a redundant toString(), as getString already returns a String:
app=menuObject.getJSONObject(i).getString("value");
Its wrong:
JSONArray menuObject = new JSONArray(jObject.getString("JSONDATA"));
Try:
JSONObject jObject= new JSONObject(yourJSONString);
JSONArray menuObject = jObject.getJSONArray("JSONDATA");
Keep one thing in mind:
Create a JSON Object with JSON String you want to parse and then you can fetch String/JSON Object or JSON Array from the created JSON Object.
Store your json response in a String
String jsonResponse="YOUR JSON RESPONSE STRING";
//Pass the string as below
JSONObject jObject= new JSONObject(jsonResponse);
JSONArray menuObject = jObject.getJSONArray("JSONDATA"));
String app;
for (int i = 0; i<menuObject.length(); i++) {
{
app=menuObject.getJSONObject(i).getString("value").toString();
a.append(app); // a is my TextView
}
Use the appropiate getters and setters in JSONObject and JSONArray, and your "JSONDATA" entry is not a string. Do something like this:
JSONObject jObject = new JSONObject(yourJsonString);
JSONArray menuArray = jObject.getJSONArray("JSONDATA");
for (int i = 0; i < menuArray.length(); i++) {
String app = menuObject.getJSONObject(i).getString("value");
a.append(app); // a is my TextView
}
Use following code for parse your json string.
JSONObject obj = new JSONObject(youtString);
JSONArray array = obj.getJSONArray("JSONDATA");
for (int i = 0; i < array.length(); i++) {
JSONObject c = array.getJSONObject(i);
String key = c.getString("key");
String value = c.getString("value");
a.append(value);
}
Use this:-
String result="[{"key":0,"value":"--Any--"},{"key":61,"value":"Accounting"},{"key":81,"value":"Aerospace & Defense"},{"key":72,"value":"Automotive"},{"key":83,"value":"Banking"},{"key":84,"value":"Biotech"},{"key":85,"value":"Construction"},{"key":86,"value":"Customer Service"},{"key":87,"value":"Education"},{"key":82,"value":"Energy"},{"key":70,"value":"Finance"},{"key":193,"value":"Government"},{"key":194,"value":"Healthcare"},{"key":71,"value":"Insurance"},{"key":73,"value":"Legal"},{"key":62,"value":"Management"},{"key":63,"value":"Manufacturing"},{"key":64,"value":"Marketing\/Advertising"},{"key":77,"value":"Media - Journalism"},{"key":74,"value":"Pharmaceutical"},{"key":75,"value":"Real Estate"},{"key":76,"value":"Research"},{"key":65,"value":"Restaurant"},{"key":66,"value":"Retail"},{"key":67,"value":"Sales"},{"key":78,"value":"Science"},{"key":68,"value":"Telecommunications"},{"key":79,"value":"Training"},{"key":69,"value":"Transportation"},{"key":80,"value":"Utilities"}]";
JSONArray menuObject = new JSONArray(result);
String app;
for (int i = 0; i<menuObject.length(); i++) {
{
app=menuObject.getJSONObject(i).getString("value").toString();
a.append(app); // a is my TextView
}