Read hashmap nested properties dynamically

Read hashmap nested properties dynamically - java

I have the JSON below:
"total":"2",
"offset":"1",
"limit":"2",
"results":[{
"code":1,
"title":"RESTAURANTE SADOCHE",
"contact":{
"code":10,
"name":"HENRIQUE BARBALHO",
"company":{
"code":100,
"name":"RESTAURANTE SADOCHE LTDA-ME"
}
}
},
{
"code":2,
"title":"ARNALDO GRILL",
"contact":{
"code":20,
"name":"FÁTIMA COSTA",
"company":{
"code":200,
"name":"COSTA NATAL RESTAURANTE EIRELI"
}
}
}]
I turned this JSON into a Java HashMap using the Gson library.
Map<String, Object> retMap = new Gson().fromJson(jsonUpString, new TypeToken<HashMap<String, Object>>(){}.getType());
I need to dynamically read some properties of this created hashmap. Ex: title, name of contact and name of company.
Sometimes these properties (title, name of contact and name of company) can be inside lists.
Below my code:
String propertyName = "name";
String nesting = "results;contact;company";
String[] levels = nesting.split(";");
Map map = new HashMap();
map = retMap;
for (int i = 0; i < niveis.length; i++) {
map = (Map)map.get(levels[i]);
System.out.println(map);
if (i == levels.length - 1) {
System.out.println(map.get(propertyName));
}
}
But if the properties (results, contact or company) return more than one object, the JSON returns them as lists, and I can't get the information I need.

I solved the problem using...
private static void leJSON(Object object) {
if (object instanceof JSONObject) {
Set < String > ks = ((JSONObject) object).keySet();
for (String key: ks) {
Object value = ((JSONObject) object).get(key);
if (value != null) {
System.out.printf("%s=%s (%s)\n", key, value, value.getClass().getSimpleName());
if (value.getClass().getSimpleName().equalsIgnoreCase("JSONArray")) {
JSONArray ja = (JSONArray) value;
for (int i = 0; i < ja.size(); i++) {
leJSON(ja.get(i));
}
}
if (value.getClass().getSimpleName().equalsIgnoreCase("JSONObject")) {
leJSON(value);
}
}
}
}
}
main method...
String json = "{...}";
JSONObject object = (JSONObject) JSONValue.parse(jsonString2);
readJSON(object);

Related

Compare list of JSONArray in ArrayList

I have an ArrayList containing a list of JSONArrays
staffArray = new ArrayList<JSONArray>();
the JSONArray is in a form of this:
[
{
"id": "k40dn-dff02-mm1",
"name": "staff1",
"tel": "0123456789",
},
{
"id": "ch2mq-pmw01-ps6",
"name": "staff2",
"tel": "9876543210",
}
...
]
And the ArrayList will be containing different sizes of JSONArray.
Now I want to check in the ArrayList for each JSONArray, if they contain the same value for "id". So say that if the ArrayList has three different sizes of JSONArray, how can I tell the they each contain a JSONObject with the same value for "id" in it.
So far I have tried this to extract the string:
for(int i = 0; i < staffArray.size(); i++){
JSONArray jsonArray = new JSONArray();
jsonArray = staffArray.get(i);
for(int j = 0; j < jsonArray.length(); j ++){
JSONObject json = null;
try {
json = jsonArray.getJSONObject(j);
String id = json.getString("id");
} catch (JSONException e) {
e.printStackTrace();
}
}
}

If you would like to check for duplicate IDs in your ArrayList, you could do something like this:
ArrayList<JSONArray> staffArray = new ArrayList<>();
Set<String> ids = new HashSet<>();
for (JSONArray array : staffArray) {
for (int i = 0; i < array.length(); i++) {
JSONObject obj = array.getJSONObject(i);
if (!ids.add(obj.getString("id"))) {
// duplicate IDs found, do something
}
}
}

How about using group by to group the json arrays with same id something like this
public static void groupById(List<JSONArray> staffArray) {
Map<String, List<JSONArray>> jsonArraysById = staffArray.stream().collect(Collectors.groupingBy(jsonArray -> getIdFromJsonArray(jsonArray)));
jsonArraysById.forEach((id, arrays) -> {
System.out.println("Arrays with id " + id + " are " + arrays);
});
}
public static String getIdFromJsonArray(JSONArray jsonArray) {
String result = null;
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject json = null;
try {
json = jsonArray.getJSONObject(j);
result = json.getString("id");
} catch (JSONException e) {
e.printStackTrace();
}
}
return result;
}

How to get keys in nested json with parent prefix using GSON in java

I have tried the following example.
public static void operate2(JsonElement jsonElement, List keys, JsonElement jsonElement2, String prefix){
String prefixnew = "";
if(jsonElement.isJsonArray()){
JsonArray jsonArray = jsonElement.getAsJsonArray();
for(int i=0; i<jsonArray.size(); i++){
jsonElement = jsonArray.get(i);
operate2(jsonElement, keys, jsonElement2, prefix);
}
}else if(jsonElement.isJsonObject()){
JsonObject jsonObject = jsonElement.getAsJsonObject();
Set<Map.Entry<String,JsonElement>> childEntrySet = jsonObject.entrySet();
for (Map.Entry<String, JsonElement> child: childEntrySet) {
jsonElement2 = child.getValue();
Object keyCheck = new Gson().fromJson(jsonElement2.toString(), Object.class);
if (keyCheck instanceof Map) {
prefix += child.getKey()+"_";
keys.add(prefix);
System.out.println("Map="+child.getKey());
}else if (keyCheck instanceof Collection) {
if(!prefix.equals("")){
prefix += child.getKey()+"_";
keys.add(prefix);
}else{
prefix = child.getKey()+"_";
keys.add(prefix);
}
System.out.println("Collection="+child.getKey());
}else{
prefix += "";
}
operate2(jsonElement2, keys, jsonElement2, prefix);
}
}else{
prefix = "";
}
}
public static void test2(String json){
JsonElement jsonElement = new JsonParser().parse(json);
JsonElement jsonElement2 = null;
String prefix = "";
List keys = new ArrayList();
operate2(jsonElement, keys, jsonElement2, prefix);
Set keySet = new HashSet(keys);
System.out.println("Keys = "+keys);
}
The output I got Keys = [items_, items_contact_, items_contact_records_, items_contact_records_recordings_, items_contact2_]
But I need items_, items_contact_, items_records_ .... As we can see that record is not the child of the contact, so items_contact_records_ should not be there. Instead items_records_ should be.
The source json would be
{
"items": [{
"id": 633706061003,
"fromNumber": "16572307534",
"contact": {
"id": 499354453003,
"homePhone": "16572307534"
},
"records": [{
"id": 353389055003,
"result": "LA",
"recordings": [{
"id": 16427622003
}]
}]
}],
"limit": 100,
"offset": 0,
"totalCount": 5949
}

I would use the following approach:
if the root element is not a json object, return an empty list
otherwise iterate other its entries, and for each one add the key if the value associated with is either an object or an array
proceed recursively for the value
public static List<String> operate(final JsonElement jsonElement, final String prefix, final boolean firstLayer) {
if(jsonElement.isJsonObject() || (!firstLayer && jsonElement.isJsonArray())) {
List<String> keys = new ArrayList<>();
if(jsonElement.isJsonObject()) {
JsonObject jObj = jsonElement.getAsJsonObject();
for(Map.Entry<String, JsonElement> entry : jObj.entrySet()) {
JsonElement value = entry.getValue();
String newPrefix = prefix + entry.getKey();
if(value.isJsonArray() || value.isJsonObject()) {
keys.add(newPrefix);
keys.addAll(operate(value, newPrefix + "_", false));
}
}
} else {
JsonArray array = jsonElement.getAsJsonArray();
for(JsonElement element : array) {
keys.addAll(operate(element, prefix, false));
}
}
return keys;
} else {
return Collections.emptyList();
}
}
and the test method:
public static void test(String json) {
JsonElement jsonElement = new JsonParser().parse(json);
List<String> keys = operate(jsonElement, "", true);
System.out.println("Keys = " + keys);
}
Running it on your example, you'll get:
Keys = [items, items_contact, items_records, items_records_recordings]

Access first array in a JSON string using JSON Parser

How do I access the array products from the below JSON string? I would ideally do this, and it works -
JSONParser parser = new JSONParser();
Object response = parser.parse(json);
JSONObject jsonObject = (JSONObject) response;
JSONObject info = (JSONObject) jsonObject.get("info");
JSONArray data = (JSONArray) jsonObject.get("products");
But the problem is the root element info is not always the same, so I can't hardcode my code. Basically, I don't want to access products by accessing info first. I want to directly access the products array.
How can I do this?
{
"info": {
"products": [
{
"test": 11577,
"number": 2541,
"product": "deoderant",
"id": 1,
"subId": 5,
"tempId": 3,
"name": null,
"lastModified": "2015-05-24",
"lastUsed": 5,
"score": 0.93,
"season": "Seasonal",
"availability": 0,
"itemRanking": null,
"itemQuantity": 5,
"listOfStores": [
7896
]
}
],
"storeId": 10145678
}
}

convert to map, LinkedHashMap or HashMap as per your need, then get the entry value.
public class Test {
public static void main(String[] args) {
String json = "{\"info\": {\"products\": [{\"test\": 11577,\"number\": 2541,\"product\": \"deoderant\",\"id\": 1,\"subId\": 5,\"tempId\": 3,\"name\": null,\"lastModified\": \"2015-05-24\",\"lastUsed\": 5,\"score\": 0.93,\"season\": \"Seasonal\",\"availability\": 0,\"itemRanking\": null,\"itemQuantity\": 5,\"listOfStores\": [7896]}],\"storeId\": 10145678}}";
JSONObject jsonObject;
try {
jsonObject = new JSONObject(json);
Map<String, Object> map = getMap(jsonObject);
for (Map.Entry<String, Object> entry : map.entrySet()) {
System.out.println(entry.getKey());
System.out.println(entry.getValue());
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static Map getMap(JSONObject object) {
Map<String, Object> map = new LinkedHashMap<String, Object>();
Object jsonObject = null;
String key = null;
Object value = null;
try {
Iterator<String> keys = object.keys();
while (keys.hasNext()) {
key = null;
value = null;
key = keys.next();
if (null != key && !object.isNull(key)) {
value = object.get(key);
}
if (value instanceof JSONObject) {
map.put(key, getMap((JSONObject) value));
continue;
}
if (value instanceof JSONArray) {
JSONArray array = ((JSONArray) value);
List list = new ArrayList();
for (int i = 0 ; i < array.length() ; i++) {
jsonObject = array.get(i);
if (jsonObject instanceof JSONObject) {
list.add(getMap((JSONObject) jsonObject));
} else {
list.add(jsonObject);
}
}
map.put(key, list);
continue;
}
map.put(key, value);
}
} catch (Exception e) {
System.out.println(e);
}
return map;
}
}
Output
info
{products=[{test=11577, number=2541, product=deoderant, id=1, subId=5, tempId=3, name=null, lastModified=2015-05-24, lastUsed=5, score=0.93, season=Seasonal, availability=0, itemRanking=null, itemQuantity=5, listOfStores=[7896]}], storeId=10145678}

I don't know if this is the best way - but you can always get the keys of your objects with the keys() method. So you will know the name of the top object.

Use fasterxml lib,you can write code like below:
ObjectMapper mapper = new ObjectMapper();
// json is your json string
String json = "";
JsonNode jsonNode = node.findParent("products").get("products");
System.out.println(jsonNode);

How to store JSONcontaining Nested JSONArray

I'm working on one app in which I have JSON Like..
{
"Group Details":
[
{
"groupMasterId": "25",
"GroupName": "Gangs of Beasts",
"groupIcon": "http://xxx.xxx.xx.x/XYZ/images/evil.png",
"GroupDescription": "Fellowzzzgroup",
"GroupCreatedDate": "2014-04-30 15:41:01",
"GroupMassage": "no such thing is like group msg",
"UserData":
[
{"UserMobile": "1111111111","AdminFlag": "1"},
{"UserMobile": "1234567890","AdminFlag": "0"},
{"UserMobile": "9988776655","AdminFlag": "0"},
{"UserMobile": "234t537535","AdminFlag": "0"},
{"UserMobile": "3489869348","AdminFlag": "0"},
{"UserMobile": "1234567890","AdminFlag": "0"}
]
}
]
}
I want to display Details on simple TextView and UserData in ListView..but the proble in I'm total confused with how to store this data.. I done following code to do it,,but not able to store all UserMobile in single HashMap...
JSONObject jsonObj = new JSONObject(jsonstr);
GroupDetailsArray = jsonObj.getJSONArray(GROUPDETAILS);
HashMap<String, String> groupuser = new HashMap<String, String>();
for (int i = 0; i < GroupDetailsArray.length(); i++) {
JSONObject l = GroupDetailsArray.getJSONObject(i);
// String ID= l.getString(GROUPMASTERID);
String NAME = l.getString(GROUPNAME);
String DESCRIPTION = l.getString(GROUPDESCRIPTION);
String DATE = l.getString(GROUPCREATEDDATE);
String ICON = l.getString(GROUPICON);
JSONArray UsedDataArray = l.getJSONArray(USERDATA);
String ADMIN;
for (int j = 0; j < UsedDataArray.length(); j++) {
JSONObject l1 = UsedDataArray.getJSONObject(j);
if (l1 != null) {
String MOBILENUMBER = l1.getString(USERMOBILE);
if (l1.getString(ADMINFLAG).equals("0")) {
ADMIN = "Member";
} else {
ADMIN = "Admin";
}
// tmp hashmap for single group
groupuser.put(USERMOBILE, MOBILENUMBER);
groupuser.put(ADMINFLAG, ADMIN);
}
}
// tmp hashmap for single group
HashMap<String, String> group = new HashMap<String, String>();
// adding each child node to HashMap key => value
group.put(GROUPNAME, NAME);
group.put(GROUPDESCRIPTION, DESCRIPTION);
group.put(GROUPCREATEDDATE, DATE);
group.put(USERDATA, groupuser.toString());
group.put(GROUPICON, ICON);
// adding group to group list
Utility.groupdetailsarraylist.add(group);
Log.d("groupdetailsarraylist",
Utility.groupdetailsarraylist.toString());
}
please help me to how to store data so that I can use it to store in next Activity...

List list1=new ArrayList<String>();
JSONArray array=jso.getJSONArray("UserData");
for(int i=0;i<array.length();i++)
{ list1.add(array.getJSONObject(i).getString("UserMobile"));
}
Iterator itr=list1.iterator();
while(itr.hasNext())
{
str1=itr.next().e+"\n";
}

Update elements in a JSONObject

Lets say I gave a JSONObject
{
"person":{"name":"Sam", "surname":"ngonma"},
"car":{"make":"toyota", "model":"yaris"}
}
How do I update some of the values in the JSONObject?
Like below :
String name = jsonArray.getJSONObject(0).getJSONObject("person").getString("name");
name = "Sammie";

Use the put method: https://developer.android.com/reference/org/json/JSONObject.html
JSONObject person = jsonArray.getJSONObject(0).getJSONObject("person");
person.put("name", "Sammie");

Remove key and then add again the modified key, value pair as shown below :
JSONObject js = new JSONObject();
js.put("name", "rai");
js.remove("name");
js.put("name", "abc");
I haven't used your example; but conceptually its same.

Hello I can suggest you universal method. use recursion.
public static JSONObject function(JSONObject obj, String keyMain,String valueMain, String newValue) throws Exception {
// We need to know keys of Jsonobject
JSONObject json = new JSONObject()
Iterator iterator = obj.keys();
String key = null;
while (iterator.hasNext()) {
key = (String) iterator.next();
// if object is just string we change value in key
if ((obj.optJSONArray(key)==null) && (obj.optJSONObject(key)==null)) {
if ((key.equals(keyMain)) && (obj.get(key).toString().equals(valueMain))) {
// put new value
obj.put(key, newValue);
return obj;
}
}
// if it's jsonobject
if (obj.optJSONObject(key) != null) {
function(obj.getJSONObject(key), keyMain, valueMain, newValue);
}
// if it's jsonarray
if (obj.optJSONArray(key) != null) {
JSONArray jArray = obj.getJSONArray(key);
for (int i=0;i<jArray.length();i++) {
function(jArray.getJSONObject(i), keyMain, valueMain, newValue);
}
}
}
return obj;
}
It should work. If you have questions, go ahead.. I'm ready.

Generic way to update the any JSONObjet with new values.
private static void updateJsonValues(JsonObject jsonObj) {
for (Map.Entry<String, JsonElement> entry : jsonObj.entrySet()) {
JsonElement element = entry.getValue();
if (element.isJsonArray()) {
parseJsonArray(element.getAsJsonArray());
} else if (element.isJsonObject()) {
updateJsonValues(element.getAsJsonObject());
} else if (element.isJsonPrimitive()) {
jsonObj.addProperty(entry.getKey(), "<provide new value>");
}
}
}
private static void parseJsonArray(JsonArray asJsonArray) {
for (int index = 0; index < asJsonArray.size(); index++) {
JsonElement element = asJsonArray.get(index);
if (element.isJsonArray()) {
parseJsonArray(element.getAsJsonArray());
} else if (element.isJsonObject()) {
updateJsonValues(element.getAsJsonObject());
}
}
}

public static JSONObject updateJson(JSONObject obj, String keyString, String newValue) throws Exception {
JSONObject json = new JSONObject();
// get the keys of json object
Iterator iterator = obj.keys();
String key = null;
while (iterator.hasNext()) {
key = (String) iterator.next();
// if the key is a string, then update the value
if ((obj.optJSONArray(key) == null) && (obj.optJSONObject(key) == null)) {
if ((key.equals(keyString))) {
// put new value
obj.put(key, newValue);
return obj;
}
}
// if it's jsonobject
if (obj.optJSONObject(key) != null) {
updateJson(obj.getJSONObject(key), keyString, newValue);
}
// if it's jsonarray
if (obj.optJSONArray(key) != null) {
JSONArray jArray = obj.getJSONArray(key);
for (int i = 0; i < jArray.length(); i++) {
updateJson(jArray.getJSONObject(i), keyString, newValue);
}
}
}
return obj;
}

Recursive way to update value in depth in Kotlin
Example: setJsonValue("obj1/obj2/keyToUpdate", "new value")
fun setJsonValue(path: String, value: Any?) {
setJsonValueRec(
path = path.split("/"),
index = 0,
obj = jsonObj,
value = value
)
}
private fun setJsonValueRec(path: List<String>, index: Int, obj: JSONObject, value: Any?): JSONObject {
return obj.put(
path[index],
when (index) {
path.lastIndex -> value
else -> setJsonValueRec(
path = path,
index = index + 1,
obj = obj.getJSONObject(path[index]),
value = value
)
}
)
}

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Read hashmap nested properties dynamically - java

Related

Compare list of JSONArray in ArrayList

How to get keys in nested json with parent prefix using GSON in java

Access first array in a JSON string using JSON Parser

How to store JSONcontaining Nested JSONArray

Update elements in a JSONObject

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