Nishant Tanwar
Reputation: 383
Parse json without knowning the keys
i am trying to parse json in java without knowing the keys and the structure of json format and save that data into the hashmap
how would i cycle through the whole json format and store key and value into the hashmap
{"id" : 12345, "value" : "123", "person" : "1"}
like in this example all the keys would be jsonobject none of them will be json array
There is some other library like jackson i don't want to use any third party library
Upvotes: 6
Views: 12824
Answers (3)
Hassan Butt
Reputation: 1
// add this in your android App module
compile 'com.fasterxml.jackson.core:jackson-core:2.5.3'
compile 'com.fasterxml.jackson.core:jackson-annotations:2.5.3'
compile 'com.fasterxml.jackson.core:jackson-databind:2.5.3'
android {
packagingOptions {
exclude 'META-INF/DEPENDENCIES.txt'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/notice.txt'
exclude 'META-INF/license.txt'
exclude 'META-INF/dependencies.txt'
exclude 'META-INF/LGPL2.1'
exclude 'META-INF/ASL2.0'
}
}
// now in main activity...
// here is working code for parsing and differentiating keys and values without knowing the structure of the json
ArrayList<String> jsonKeys;
Object[] arr3;
ArrayList<String> jKeys;
ArrayList<String> jsonValues;
Object[] arr2;
ArrayList<String> jValues;
dataObject = new ArrayList<String>();
jKeys = new ArrayList<String>();
jValues = new ArrayList<String>();
final String json = "{\"code\":100,\"payload\":{\"address1\":\"sggsgzg\",\"didPassWelcome\":false,\"didSetPasscode\":false,\"didSetPassword\":false,\"didVerifyDwolla\":false,\"didVerifyEmail\":false,\"email\":\"[email protected]\",\"firstName\":\"waseem\",\"id\":107,\"isStriprConnected\":true,\"lastName\":\"imran\",\"phone\":\"923017948684\",\"profileImage\":\"http://staging.api.giivv.com/resources/9cc82b7a-9665-4980-a54e-1ef45582cb66.jpg\",\"role\":4,\"userCreateTime\":\"2017-06-20\"}}";
//String z = "{code:100,payload:{address1:sggsgzg,didPassWelcome:false,didSetPasscode:false,didSetPassword:false,didVerifyDwolla:false,didVerifyEmail:false,email:[email protected],firstName:waseem,id:107,isStriprConnected:true,lastName:imran,phone:923017948684,profileImage:http://staging.api.giivv.com/resources/9cc82b7a-9665-4980-a54e-1ef45582cb66.jpg,role:4,userCreateTime:2017-06-20}}";
// calling parsing method
parse2(json);
//here is the method
public void parse2(String json) {
try {
JsonFactory f = new JsonFactory();
JsonParser token = f.createParser(json);
jsonKeys = new ArrayList<>();
jsonValues = new ArrayList<>();
String j = "";
String key = "";
while (token.nextToken() != JsonToken.END_OBJECT) {
if (token.getCurrentToken().equals(JsonToken.START_ARRAY)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value arrS:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.END_ARRAY)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value arrE:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.START_OBJECT)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value ObjectStart:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.END_OBJECT)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value ObjectEnd:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.FIELD_NAME)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value FieldName:", j);
jsonKeys.add(j);
} else if (token.getCurrentToken().equals(JsonToken.VALUE_FALSE)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value False:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.VALUE_NULL)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value null:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.VALUE_NUMBER_FLOAT)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value NumFLOAT:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.VALUE_NUMBER_INT)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value NumINT:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.VALUE_STRING)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value STRING:", j);
jsonValues.add(j);
} else if (token.getCurrentToken().equals(JsonToken.VALUE_TRUE)) {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value TRUE", j);
jsonValues.add(j);
} else {
System.out.println(token.getText());
j = token.getText();
// Log.e("JSON value ELSE:", j);
jsonValues.add(j);
}
}
System.out.println("MY JSON KV FILE");
System.out.println("this is the file \n");
arr3 = new Object[jsonKeys.size()];
arr3 = (Object[]) jsonKeys.toArray();
for (Object t : arr3) {
Log.e("JSON KEy File:", (String) t);
jKeys.add(t.toString());
}
arr2 = new Object[jsonValues.size()];
arr2 = (Object[]) jsonValues.toArray();
for (Object t2 : arr2) {
Log.e("JSON Value File:", (String) t2);
jValues.add(t2.toString());
}
} catch (Exception e) {
System.out.println(e);
}
}
// output in console:
JsonKeys: 17
JsonKeys: [code, payload, address1, didPassWelcome, didSetPasscode, didSetPassword, didVerifyDwolla, didVerifyEmail, email, firstName, id, isStriprConnected, lastName, phone, profileImage, role, userCreateTime]
JsonValues: 18
JsonValues: [{, 100, {, sggsgzg, false, false, false, false, false, [email protected], waseem, 107, true, imran, 923017948684, http://staging.api.giivv.com/resources/9cc82b7a-9665-4980-a54e-1ef45582cb66.jpg, 4, 2017-06-20]
Upvotes: -1
Jared Rummler
Reputation: 38141
Possible solution:
private HashMap<String, Object> getHashMapFromJson(String json) throws JSONException {
HashMap<String, Object> map = new HashMap<String, Object>();
JSONObject jsonObject = new JSONObject(json);
for (Iterator<String> it = jsonObject.keys(); it.hasNext();) {
String key = it.next();
map.put(key, jsonObject.get(key));
}
return map;
}
Testing with your example JSON string:
private void test() {
String json = " {\"id\" : 12345, \"value\" : \"123\", \"person\" : \"1\"}";
try {
HashMap<String, Object> map = getHashMapFromJson(json);
for (String key : map.keySet()) {
Log.i("JsonTest", key + ": " + map.get(key));
}
} catch (JSONException e) {
Log.e("JsonTest", "Failed parsing " + json, e);
}
}
Output:
I/JsonTest(24833): id: 12345
I/JsonTest(24833): value: 123
I/JsonTest(24833): person: 1
Note: This is not ideal and I just wrote it real quick.
Upvotes: 3
JaskeyLam
Reputation: 15785
What about quick-json parser
JsonParserFactory factory=JsonParserFactory.getInstance();
JsonParser parser=factory.newJsonParser();
Map jsonData=parser.parseJson(inputJsonString);
Upvotes: 0
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