I'm parsing a JsonObject with gson library using maven dependencies
but I can not have a map containing the keys and values.
I tried with the keyset method but it does not find the correspondence with the value (null pointer exception error) the JSONArray fields reprensent the array that i want to get but currentJsonObject.get("fields")
return an object that i cant parse to get the other key values.
this is the result of object which i get it from the object return by get("fields")
To summarize I want to parse the JSONArray fields and retrieve the value key from this array
JsonReader jsonReader = new JsonReader(new InputStreamReader(new FileInputStream("filename"), StandardCharsets.UTF_8));
jsonReader.beginArray();
Gson gson = new GsonBuilder().create();
Collection<String> list ;
Collection<String> keys ;
BasicDBObject map = new BasicDBObject();
while (jsonReader.hasNext()) {
JSONObject currentJsonObject = gson.fromJson(jsonReader,
JSONObject.class);
System.out.println(currentJsonObject.get("fields"));
}
jsonReader.close();
Json :
The below code might help you:
public String parse(String jsonLine) {
JsonElement jelement = new JsonParser().parse(jsonLine);
JsonObject jobject = jelement.getAsJsonObject();
jobject = jobject.getAsJsonObject("data");
JsonArray jarray = jobject.getAsJsonArray("translations");
jobject = jarray.get(0).getAsJsonObject();
String result = jobject.get("translatedText").getAsString();
return result;
}
Related
For the below Json payload I'am trying to get the first array element of email_address.
However using the below code I get email address but with the array bracket and quotes like: ["test#test.com"].
I need only the email address text. First element array.
Payload:
{
"valid":{
"email_addresses":[
"testauto#test.com"
]
}
}
Code:
JSONParser parser = new JSONParser();
JSONObject jsonObject = (JSONObject) parser.parse(new FileReader(jsonfilepath));
JSONObject jsonObjects = (JSONObject) parser.parse(jsonObject.get("valid").toString());
String email = jsonObjects.get("email_addresses").toString();
System.out.println("Email address:"+email);
Maybe this unitTest could help you
#Test
public void test() throws JSONException, FileNotFoundException {
JSONObject json = new JSONObject(new JSONTokener(new FileInputStream(new File(jsonfilepath))));
JSONObject valid = (JSONObject) json.get("valid");
Object emailAdresses = valid.get("email_addresses");
if (emailAdresses instanceof JSONArray) {
JSONArray emailAdressArray = (JSONArray) emailAdresses;
Object firstEmailAdress = emailAdressArray.get(0);
System.out.println(firstEmailAdress.toString());
}
}
You could use JSONArray to get the array values:
JSONArray emailAddresses = (JSONArray) jsonObjects.get("email_addresses");
String email = emailAddresses.getJSONObject(0).toString()
System.out.println("Email address: " + email);
Even though I strongly encourage using gson to parse json instead of doing this way, it makes life easier.
I am returning an JSON array which contains many objects, I'm looking to be able to search the attributes in each object and then return the objects that meet this criteria.
I am able to return the JSON array but I'm having trouble on how to then search through the objects to match the attribute values to a given value.
Some example values from the array:
[
{"blobJson":"x","deviceMfg":10,"eventCode":0,"sensorClass":3,"sensorUUID":"136199","timeStamp":1.483384640123117E9,"uID":"136199_3_10"},
{"blobJson":"x","deviceMfg":10,"eventCode":0,"sensorClass":3,"sensorUUID":"136199","timeStamp":1.483379834470379E9,"uID":"136199_3_10"},
{"blobJson":"x","deviceMfg":10,"eventCode":0,"sensorClass":3,"sensorUUID":"136199","timeStamp":1.483384639621985E9,"uID":"136199_3_10"}
]
I'm using the following code to return the array, which works as expected:
JsonParser jp = new JsonParser();
JsonElement root = jp.parse(new InputStreamReader((InputStream) request.getContent()));
JsonArray rootArr = root.getAsJsonArray();
The following block of code is what I'm using to search through an object for the given attribute value, this code works when only an object is returned but gives an error when the whole array is returned:
JsonObject rootObj = rootArr.getAsJsonObject();
for (String attribute : attributes) {
System.out.println(rootObj.get(attribute).getAsString());
}
It is giving the error:
java.lang.IllegalStateException: Not a JSON Object:
I've tried changing rootObj.get(attribute) to rootArr.get(attribute) but that returns the error:
incompatible types: java.lang.String cannot be converted to int
This is the method call:
method("136199", Arrays.asList("blobJson", "deviceMfg", "uID"));
Method declaration:
void method(String sensor, List<String> attributes)
The issue is that you're trying to treat JsonArray to JsonObject. Try the below code and see if it works for you. Point of interest for now is - JsonObject rootObj = rootArr.get(0).getAsJsonObject();
public static void main(String[] args) {
String json = "[{\"blobJson\":\"x\",\"deviceMfg\":10,\"eventCode\":0,\"sensorClass\":3,\"sensorUUID\":\"136199\",\"timeStamp\":1.483384640123117E9,\"uID\":\"136199_3_10\"},{\"blobJson\":\"x\",\"deviceMfg\":10,\"eventCode\":0,\"sensorClass\":3,\"sensorUUID\":\"136199\",\"timeStamp\":1.483379834470379E9,\"uID\":\"136199_3_10\"},{\"blobJson\":\"x\",\"deviceMfg\":10,\"eventCode\":0,\"sensorClass\":3,\"sensorUUID\":\"136199\",\"timeStamp\":1.483384639621985E9,\"uID\":\"136199_3_10\"}]";
JsonParser jp = new JsonParser();
JsonElement root = jp.parse(json);
JsonArray rootArr = root.getAsJsonArray();
JsonObject rootObj = rootArr.get(0).getAsJsonObject();
rootObj.entrySet().forEach(entry -> System.out.println(entry.getKey()+": "+entry.getValue().getAsString()));
}
Here is what you can try
try {
JSONArray jsonArray = new JSONArray(data);
for (int i = 0; i < jsonArray.length(); i++) {
Log.e("JSON Count", jsonArray.get(i).toString());
}
} catch (Exception e) {
}
I want to read this json in a servlet
{
"text" : "ABC",
"msg" : "9551667858",
"all":[
{"name":"one"},
{"name":"two"}
],
"obj":{
"firstname":"John",
"lastname":"Doe"
}
}
Now i want to get this values to separately to string,jsonarray and json object
this is how i do that
PrintWriter out = response.getWriter();
try {
String newObj = request.getParameter("text");;
JSONObject jObj = new JSONObject(request.getParameter("obj"));
JSONArray jArray=new JSONArray(request.getParameter("all"));
out.print(newObj);
} catch (Exception e) {
e.printStackTrace();
out.write(e.toString());
}
response.setContentType("application/json");
your code is partially correct.String newObj = request.getParameter("jsondata"); is correct. Then you have to create the jObj from newObj string.
String jsonString = <your json String>
JSONObject jsonObj = new JSONObject(jsonString);
JSONObject allObj = jsonObj.getJSONObject("obj");
JSONArray allArray = jsonObj.getJSONArray("all");
First read the data from request object :-
String jsonStr = request.getParameter("jsondata");
Use org.json library to parse it and create JsonObject :-
JSONObject jsonObj = new JSONObject(jsonStr );
Now, use this object to get your values :-
String id = jsonObj.getString("text");
You can see complete example here :-
How to parse Json in java
if your String data like ,
{
"text" : "ABC",
"msg" : "9551667858",
"all":[
{"name":"one"},
{"name":"two"}
],
"obj":{
"firstname":"John",
"lastname":"Doe"
}
}
and It can get like,
String jsonData = request.getParameter("jsondata");
Parse to JSONObject is.
JSONObject jsonObject = new JSONObject(jsonData); // put "String"
You can get JSONArray like,
JSONArray jsonArray = jsonObject.getJSONArray("all");
good luck
In Spring mvc I have a mytable.json file.
I want to fetch that json file data and then want to add to model.addAttribute().
mytable.json
{"name1":["place1.1","place1.2"],
"name2":["place2.1","place1.2"]
...........
.........}
I want to fetch the names with their corresponding citylist.
Ex:
name1=place1.1,place1.2
so,I have done:--
try {
JSONParser parser = new JSONParser();
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("file/mytable.json").getFile());
JSONObject obj = (JSONObject) parser.parse(new FileReader(file));
Iterator<String> keys = obj.values().iterator();
while( keys.hasNext() )
{
String key = (String)keys.next();
if ( obj.get(key) instanceof JSONObject )
{
model.addAttribute("key", key);
}
}
} catch (Exception e) {
e.printStackTrace();
}
But I am getting error:
Unexpected character (�) at position 0.
in this line :
JSONObject obj = (JSONObject) parser.parse(new FileReader(file));
why??Where is the problem?
The JSONParser parser = new JSONParser(); is expecting a JSON String, not a .json file. hence the Unexpected character.... error.
You can InputStreamReader:
jsonObject = (JSONObject) parser.parse(new InputStreamReader(new FileInputStream("file/mytable.json")));
I want to use json encoded array which i am return from this link :
http://sids.roundone.asia/suggest.json?data=soft
as suggestions in android application.
(I have used json_encode($arr) function in php file and i am returning that as response for above link)
I have a problem in reading this response in java and storing it in an ArrayList.
My code is :
try {
String temp=sName.replace(" ", "%20");
URL js = new URL("https://sids.roundone.asia/suggest.json?data="+temp);
URLConnection jc = js.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(jc.getInputStream()));
String line = reader.readLine();
JSONObject jsonResponse = new JSONObject(line);
JSONArray jsonArray = jsonResponse.getJSONArray("results");
for(int i = 0; i < jsonResponse.length(); i++){
JSONObject r = jsonArray.getJSONObject(i);
ListData.add(new SuggestGetSet(jsonResponse.get(String.vlaueOf(iss)));
}
}
As I could see on your link, you're returning a JSON Array, instead of a JSON Object, ( "[ ]" instead of "{ }") and then in your java code you're trying to create a JSONObject here:
JSONObject jsonResponse = new JSONObject(line);
Try changing that to:
JSONArray jsonResponse = new JSONArray(line);
You return JSON array directly not a JSON Object have inner array so cast your incoming response to JSONArray directly.
JSONArray jsonResponse = new JSONArray(line);