I'm fairly new to JSON parsing in Java but when I try and parse this JSON String & find out it's "ID", it repeats the same one twice.
[
{"id":"{ID1}","time":123},
{"id":"{ID2}","time":124}
]
This is my Java code:
// v = json string, c = "id"
String output = v.replace("[", "").replace("]", "");
JSONObject obj = new JSONObject(output);
ArrayList<String> list = new ArrayList<String>();
for(int i = 0 ; i < obj.length(); i++){
System.out.println(obj.getString(c));
list.add(obj.getString(c));
}
return list.get(1);
it returns ID1 twice or more. Please help
Your JSON represents an array - so that's how you should parse it. You can then easily get the id property from each JSONObject within the array. For example:
import org.json.*;
public class Test {
public static void main(String[] args) throws JSONException {
String json =
"[{\"id\":\"{ID1}\",\"time\":123}, {\"id\":\"{ID2}\",\"time\":124}]";
JSONArray array = new JSONArray(json);
for (int i = 0; i < array.length(); i++) {
JSONObject o = array.getJSONObject(i);
System.out.println(o.getString("id"));
}
}
}
Output:
{ID1}
{ID2}
I fixed my code by using it as a JSONArray(Thanks #HotLicks)
JSONArray obj = new JSONArray(v);
ArrayList<String> list = new ArrayList<String>();
for(int i = 0 ; i < obj.length(); i++){
Logger.WriteOutput(obj.getJSONObject(i).getString(c), Logger.LogLevel.Info);
}
Try this :
// This line is useless
// String output = v.replace("[", "").replace("]", "");
JSONArray arr = new JSONArray(output);
ArrayList<String> list = new ArrayList<String>();
for(int i = 0 ; i < arr.length(); i++){
System.out.println(arr.getJSONObject(i).getString(c));
list.add(arr.getJSONObject(i).getString(c));
}
First create a java bean for your json (for example here):
public class Item {
#JsonProperty("id")
private String id;
#JsonProperty("time")
private Integer time;
public final String getId() {
return id;
}
public final void setId(String id) {
this.id = id;
}
public final Integer getTime() {
return time;
}
public final void setTime(Integer time) {
this.time = time;
}
}
If you are using Jackson Java JSON-processor, you can create a List from JSON-String this way:
ObjectMapper objectMapper = new ObjectMapper();
try {
List<Item> items = objectMapper.readValue(
yourJSONString,
objectMapper.getTypeFactory().constructCollectionType(List.class, Item.class));
for (Item item : items) {
System.out.println(item.getId());
}
} catch (IOException e) {
e.printStackTrace();
}
use below code
String v = "[{\"id\":\"ID1\",\"time\":123},{\"id\":\"ID2\",\"time\":124}]";
String c = "id";
JSONArray obj = null;
try {
obj = new JSONArray(v);
ArrayList<String> list = new ArrayList<String>();
for (int i = 0; i < obj.length(); i++) {
JSONObject j = (JSONObject) obj.get(i);
System.out.println(j.getString(c));
list.add(j.getString(c));
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
note that i have slightly corrected the json structure too
before
[
{"id":"{ID1}","time":123},
{"id":"{ID2}","time":124}
]
after
[
{"id":"ID1","time":123},
{"id":"ID2","time":124}
]
Related
This question already has answers here:
How to parse JSON in Java
(36 answers)
Closed 5 years ago.
i have problem to parse my json data,
this is my json data :
{"data":
[
{"ean": "222222","itemname": "","location": "001010202,001010201","po":[
{"ponumber": 1,"qty": 22
},
{"ponumber": 2,"qty": 33
}
]
},
{
"ean": "11112222",
"itemname": "เหงือก",
"location": "001010601",
"po": [
{
"ponumber": 1,
"qty": 7
}
]
},
{
"ean": "22223333",
"itemname": "Crystal Water",
"location": "001010410,001010401",
"po": [
{
"ponumber": 3,
"qty": 13
}
]
}
]}
i want to show the output like :
thank you
this is my java code to parsing json data and show to listview :
void parseJsonData(String jsonString) throws JSONException {
String data = "";
String data2 = null;
List<String> list = new ArrayList<>();
JSONObject json = new JSONObject(jsonString);
JSONArray arrayData = json.getJSONArray("data");
for (int i = 0; i < arrayData.length(); i++) {
JSONObject jsonDataArray = arrayData.getJSONObject(i);
String ean = jsonDataArray.getString("ean");
String itemname = jsonDataArray.getString("itemname");
String locations = jsonDataArray.getString("location");
data = "\n EAN = " + ean +
"\n Item Name = " + itemname +"\n";
JSONArray arrayPO = jsonDataArray.getJSONArray("po");
for (int j = 0; j < arrayPO.length(); j++ ) {
JSONObject jsonPO = arrayPO.getJSONObject(j);
ponumb = jsonPO.getString("ponumber");
qty = jsonPO.getString("qty");
//int numb = i + 1;
data2 = "\n PO Number : " + ponumb +
"\n Quantity : " + qty + "\n";
list.add(data+data2);
System.err.println(data+data2);
}
}
ArrayAdapter<String> LVarray;
LVarray = new ArrayAdapter<String>(ListActivity.this, android.R.layout.simple_list_item_1, list);
listView.setAdapter(LVarray);
}
this is screen shot the output:
1.You can use StringBuilder to save the data2(po List).
2.In the inner for loop ,you can use append method to add it in it .
3.Get the length of StringBuilder .Then remove the saved data2.
4.Then you can save again .
Edit
public void parseJsonData(String jsonString) throws JSONException {
String data = "";
StringBuilder data2 = new StringBuilder();
List<String> list = new ArrayList<>();
JSONObject json = new JSONObject(jsonString);
JSONArray arrayData = json.getJSONArray("data");
for (int i = 0; i < arrayData.length(); i++) {
JSONObject jsonDataArray = arrayData.getJSONObject(i);
String ean = jsonDataArray.getString("ean");
String itemname = jsonDataArray.getString("itemname");
String locations = jsonDataArray.getString("location");
data = "\n EAN = " + ean +
"\n Item Name = " + itemname + "\n";
JSONArray arrayPO = jsonDataArray.getJSONArray("po");
for (int j = 0; j < arrayPO.length(); j++) {
JSONObject jsonPO = arrayPO.getJSONObject(j);
ponumb = jsonPO.getString("ponumber");
qty = jsonPO.getString("qty");
//int numb = i + 1;
data2.append("\n PO Number : " + ponumb +
"\n Quantity : " + qty + "\n");
list.add(data + data2);
}
System.err.println(data + data2);
int sb_length = data2.length();
data2.delete(0, sb_length);
}
}
this also can help
try {
//Get root array
JSONArray data_array = jsonObject.getJSONArray("data");
for (int i=0;i<data_array.length();i++){
JSONObject jsonObject1 = array.getJSONObject(i);
String ean = jsonObject1.optString("ean");
String itemname = jsonObject1.optString("itemname");
String location = jsonObject1.optString("location");
JSONArray child_Array = jsonObject1.getJSONArray("po");
for (int j=0;j<childArray.length();j++){
JSONObject childJosnObject = array.getJSONObject(i);
String ponumber = jsonObject1.optString("ponumber");
String qty = jsonObject1.optString("qty");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
You have to try like this, it will help you
JsonParseModel jsonParseModel = new Gson().fromJson(jsonString,JsonParseModel.class);
public class JsonParseModel {
private ArrayList<DataClass> data;
public ArrayList<DataClass> getData() {
return data;
}
public void setData(ArrayList<DataClass> data) {
this.data = data;
}
public class DataClass{
private String ean,itemname,location;
private ArrayList<PoData> po;
public String getEan() {
return ean;
}
public void setEan(String ean) {
this.ean = ean;
}
public String getItemname() {
return itemname;
}
public void setItemname(String itemname) {
this.itemname = itemname;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public ArrayList<PoData> getPo() {
return po;
}
public void setPo(ArrayList<PoData> po) {
this.po = po;
}
public class PoData{
private int ponumber,qty;
public int getPonumber() {
return ponumber;
}
public void setPonumber(int ponumber) {
this.ponumber = ponumber;
}
public int getQty() {
return qty;
}
public void setQty(int qty) {
this.qty = qty;
}
}
}
}
private void parseJsondata(String response) {
try {
// response
JSONObject jsonObject = new JSONObject(response);
// get data from JSONArray
JSONArray data = jsonObject.getJSONArray("data");
// for loop to your JSONArray's Strings
for (int i = 0; i < data.length(); i++) {
// get JSONObject from i
JSONObject jo = data.getJSONObject(i);
// get string
String ean = jo.getString("ean");
String itemname = jo.getString("itemname");
String location = jo.getString("location");
JSONArray jA = jo.getJSONArray("po");
for (int j = 0; j < jA.length(); j++) {
// get JSONObject by jO
JSONObject jO = jA.getJSONObject(i);
// get string
String ponumber = jO.getString("ponumber");
String qty = jO.getString("qty");
}
}
//Log response
Log.e("response:", response);
} catch (JSONException e) {
e.printStackTrace();
}
}
String jsonString = readJsonFile(filePath);
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray result = jsonObject.getJSONArray("result");
for (int i =0; i < result.length(); i++){
JSONObject j = result.getJSONObject(i);
String s = j.getString("sentence");
int id = j.getInt("id");
String txtFile = j.getString("txtfile");
System.out.println("Sentence is:: " + s);
System.out.println("Id is:: " + id);
System.out.println("text file is:: " + txtFile);
}
} catch (JSONException e) {
e.printStackTrace();
}
currently, the above code is able to print out all the records. However, I would like to change the system.out.println into return variables such as return ID, return txtFile, return sentence. How to do that?
Create an Object. use an arraylist to store your object and use it later.
public class myItem{
String sentence;
int id;
String txtfile;
public myItem(){
}
public String getSentence(){
return sentence;
}
public setSentence(String s){
this.sentence = sentence;
}
}
public void yourFunction(){
try {
ArrayList <myItem> myList = new ArrayList();
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray result = jsonObject.getJSONArray("result");
for (int i =0; i < result.length(); i++){
JSONObject j = result.getJSONObject(i);
String s = j.getString("sentence");
myItem newItem = new myItem();
newItem.setSentence(s);
myList.add(newItem);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
I agree with what Zhi Kai said in the comment.
PS. I can't comment yet so I'm writing this as an answer.
Create a POJO and u se data structure. In your case you are using a for loop so I assume you need to return a list of values from your JSONArray.
Here's what you can do.
String jsonString = readJsonFile(filePath);
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray result = jsonObject.getJSONArray("result");
List<YourObject> yourObjectToReturn = new ArrayList<YourObject>();
for (int i = 0; i < result.length(); i++) {
YourObject yourObject = new YourObject();
JSONObject j = result.getJSONObject(i);
String s = j.getString("sentence");
int id = j.getInt("id");
String txtFile = j.getString("txtfile");
yourObject.setId(id);
yourObject.setTxtFile(txtFile);
yourObject.setSentence(s);
yourObjectToReturn.add(yourObject);
}
return yourObjectToReturn;
} catch (JSONException e) {
e.printStackTrace();
}
Updated:
public class YourObject {
private String id;
private String txtFile;
private String sentence;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTxtFile() {
return txtFile;
}
public void setTxtFile(String txtFile) {
this.txtFile = txtFile;
}
public String getSentence() {
return sentence;
}
public void setSentence(String sentence) {
this.sentence = sentence;
}
}
public List<YourObject> returnObject(){
String jsonString = readJsonFile(filePath);
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray result = jsonObject.getJSONArray("result");
List<YourObject> yourObjectToReturn = new ArrayList<YourObject>();
for (int i = 0; i < result.length(); i++) {
YourObject yourObject = new YourObject();
JSONObject j = result.getJSONObject(i);
String s = j.getString("sentence");
int id = j.getInt("id");
String txtFile = j.getString("txtfile");
yourObject.setId(id);
yourObject.setTxtFile(txtFile);
yourObject.setSentence(s);
yourObjectToReturn.add(yourObject);
}
return yourObjectToReturn;
} catch (JSONException e) {
e.printStackTrace();
}
}
Hi i am trying to iterate through a json string that looks like this:
{
"vendor":[
{
"vendor_name":"Tapan Moharana",
"vendor_description":"",
"vendor_slug":"tapan",
"vendor_logo":null,
"contact_number":null
}
],
"products":
{
"25":
{
"name":"Massage",
"price":"5000.0000",
"image":"http:\/\/carrottech.com\/lcart\/media\/catalog\/product\/cache\/1\/image\/150x\/9df78eab33525d08d6e5fb8d27136e95\/2\/9\/29660571-beauty-spa-woman-portrait-beautiful-girl-touching-her-face.jpg"
},
"26":
{
"name":"Chicken Chilly",
"price":"234.0000",
"image":"http:\/\/carrottech.com\/lcart\/media\/catalog\/product\/cache\/1\/image\/150x\/9df78eab33525d08d6e5fb8d27136e95\/c\/h\/cheicken.jpg"
},
"27":
{
"name":"Chicken Biryani",
"price":"500.0000",
"image":"http:\/\/carrottech.com\/lcart\/media\/catalog\/product\/cache\/1\/image\/150x\/9df78eab33525d08d6e5fb8d27136e95\/placeholder\/default\/image_1.jpg"
}
}
}
here is a better view of the json string:
I am iterating through the vendor array of this json string using this code:
JSONObject jsono = new JSONObject(response);
JSONArray children = jsono.getJSONArray("vendor");
for (int i = 0; i <children.length(); i++) {
JSONObject jsonData = children.getJSONObject(i);
System.out.print(jsonData.getString("vendor_name") + "<----");
// String vendorThumbNailURL=jsonData.getString("")
//jvendorImageURL.setImageUrl(local, mImageLoader);
vendorLogo=vendorLogo+jsonData.getString("vendor_logo").trim();
jvendorImageURL.setImageUrl(vendorLogo, mImageLoader);
jvendorName.setText(jsonData.getString("vendor_name"));
jvendorAbout.setText(jsonData.getString("vendor_description"));
jvendorContact.setText(jsonData.getString("contact_number"));
}
but I dont know how to get data from the "products" object please help me how do i set my json objects to iterate through "products"
when i try to change the format of the array so that both products and vendor are a separate json array i still get the above json format..
this is what i am doing
$resp_array['vendor'] = $info;
$resp_array['products'] = $vendorProductsInfo;
$resp_array = json_encode($resp_array);
print_r($resp_array);
please help me with this
MODIFIED QUESTION:
I have modified my web response like this:
[{"entity_id":24,"product_name":"Burger","product_image_url":"\/b\/u\/burger_large.jpg","price":"234.0000","category_id":59},{"entity_id":27,"product_name":"Chicken Biryani","product_image_url":"\/b\/i\/biryani.jpg","price":"500.0000","category_id":59},{"entity_id":31,"product_name":"Pizza","product_image_url":"\/p\/i\/pizza_png7143_1.png","price":"125.0000","category_id":59}]
and the code:
JSONArray children = jsono.getJSONArray("vendor");
for (int i = 0; i <children.length(); i++) {
JSONObject jsonData = children.getJSONObject(i);
System.out.print(jsonData.getString("vendor_name") + "<----");
// String vendorThumbNailURL=jsonData.getString("")
//jvendorImageURL.setImageUrl(local, mImageLoader);
vendorLogo=vendorLogo+jsonData.getString("vendor_logo").trim();
jvendorImageURL.setImageUrl(vendorLogo, mImageLoader);
jvendorName.setText(jsonData.getString("vendor_name"));
jvendorAbout.setText(jsonData.getString("vendor_description"));
jvendorContact.setText(jsonData.getString("contact_number"));
System.out.print(jsonData.getString("products") + "<----");
}
JSONObject jsono1 = new JSONObject(response);
JSONArray childrenProducts = jsono1.getJSONArray("products");
for(int i=0;i<childrenProducts.length();i++){
JSONObject jsonData = childrenProducts.getJSONObject(i);
System.out.print(jsonData.getString("name") + "<----dd");
}
but still the products part is not working... please help
Here is the working solution: Using GOOGLE GSON (Open source jar)
import java.io.IOException;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
public class JsonToJava {
public static void main(String[] args) throws IOException {
try{
String json = "<YOUR_JSON>";
Gson gson = new GsonBuilder().create();
VendorInfo vInfo = gson.fromJson(json, VendorInfo.class);
System.out.println(vInfo.getVendorName());
} catch(Exception ex) {
ex.printStackTrace();
}
}
}
Create classes for Vendor and Product
public class Vendor {
public String vendor_name;
public String vendor_description;
public String vendor_slug;
public String vendor_logo;
public String contact_number;
public String getName() {
return vendor_name;
}
}
public class Product {
public String name;
public long price;
public String image;
public String getName() {
return name;
}
}
VendorInfo is the JSON object form:
import java.util.Map;
public class VendorInfo {
public Vendor[] vendor;
public Map<Integer, Product> products;
public String getVendorName() {
return vendor[0].getName();
}
public Product getProduct() {
System.out.println(products.size());
return products.get(25);
}
}
You can add your getters for Vendor, Product and VendorInfo. You are done! You will get all the data.
Output of JsonToJava:
Tapan Moharana
To get your products data , you need to use Iterator
JSONObject jProducts = jsonObject
.optJSONObject("products");
try {
if (jProducts
.length() > 0) {
Iterator<String> p_keys = jProducts
.keys();
while (p_keys
.hasNext()) {
String keyProduct = p_keys
.next();
JSONObject jP = jProducts
.optJSONObject(keyProduct);
if (jP != null) {
Log.e("Products",
jP.toString());
}
}
}
} catch (Exception e) { // TODO:
// handle
// exception
}
you can try with this
JSONObject jsono = null;
try {
jsono = new JSONObject(response);
JSONObject productObject = jsono.getJSONObject("products");
Iterator<String> keys = productObject.keys();
while (keys.hasNext())
{
// get the key
String key = keys.next();
// get the value
JSONObject value = productObject.getJSONObject(key);
//get seprate objects
String name = value.getString("name");
String image = value.getString("image");
Log.i(TAG,name+"-"+image);
}
}
catch (JSONException e) {
e.printStackTrace();
}
Try this :
JSONObject productObject = jsono.getJSONObject("products");
JSONObject json_25 = productObject getJSONObject("25");
String name_25= json_25.getString("name");
String price_25= json_25.getString("price");
String image_25= json_25.getString("image");
JSONObject json_26 = productObject getJSONObject("26");
String name_26= json_26.getString("name");
String price_26= json_26.getString("price");
String image_26= json_26.getString("image");
JSONObject json_27 = productObject getJSONObject("27");
String name_27= json_27.getString("name");
String price_27= json_27.getString("price");
String image_27= json_27.getString("image");
I have a JSONParser method like this :
public ArrayList<Meaning> parseMeaning (JSONObject object)
{
ArrayList<Meaning> arrayList = new ArrayList<Meaning>();
try
{
JSONObject value = object.getJSONObject("Value");
JSONArray meaningArray = value.getJSONArray("Meanings");
JSONObject meaningobj = null;
for(int i = 0; i < meaningArray.length(); i++) {
meaningobj = meaningArray.getJSONObject(i);
Meaning myMeaning = new Meaning();
myMeaning.MeaningID = meaningobj.getInt("MeaningID");
myMeaning.Type1 = meaningobj.getInt("Type1");
myMeaning.Type2= meaningobj.getInt("Type2");
arrayList.add(myMeaning);
}
}
catch (JSONException e)
{
Log.d("JSONParser=>parseMeaning", e.getMessage());
}
return arrayList;
}
My meaning class is like this :
public class Meaning {
public int MeaningID;
public Integer Type1;
public Integer Type2;
}
When I run the code, some JSON Objects don't have Type2 value (because they were null in the database). So I get this exception :
D/JSONParser=>parseMeaning﹕ No value for Type2
Can you tell me how I should handle such situations when there is no value for a field? Thanks.
You can use has method of JSONObject.
E.g. :
if(meaningobj.has("Type2")){
myMeaning.Type2= meaningobj.getInt("Type2");
}
I have a JSON data in the following format,
[
{
"name": "France",
"date_time": "2015-05-17 19:59:00",
"dewpoint": "17",
"air_temp": "10.8"
},
{
"name": "England",
"date_time": "2015-05-17 19:58:48",
"dewpoint": "13",
"air_temp": "10.6"
},
{
"name": "Ireland",
"date_time": "2015-05-17 19:58:50",
"dewpoint": "15",
"air_temp": "11.1"
}
]
I have a Google map set up already for the Android app, so i have a pass the name value between two activity(GoogleMaps.java & WeatherInfo.java), now when i click a point in Google Map, it will pass the name to WeatherInfo.java, i want get the weather data for that name.
for example: i click France point in the map, The WeatherInfo.class will get the name is "France" and print out the "date_time, dewpoint, air_temp" for that point.
My question is how can i get the Json data parsed only for the point i clicked in the map? Can anyone look at the for loop in my WeatherInfo.java class?
WeatherInfo.java
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
contacts = jsonObj.getJSONArray("");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String name = c.getString(TAG_NAME);
String date_time = c.getString(TAG_DATE);
String temp = c.getString(TAG_TEMP);
String dewpoint = c.getString(TAG_DEWPOINT);
// tmp hashmap for single contact
HashMap<String, String> contact = new HashMap<String, String>();
// adding each child node to HashMap key => value
contact.put(TAG_NAME, name);
contact.put(TAG_DATE, date_time);
contact.put(TAG_TEMP, temp);
contact.put(TAG_DEWPOINT, dewpoint);
// adding contact to contact list
contactList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
JSONArray array = (JSONArray)new JSONTokener(jsonStr).nextValue();
for(int i = 0; i<array.length(); i++){
JSONObject jsonObject = array.getJSONObject(i);
String name = jsonObject.getString("name");
String date = jsonObject.getString("date_time");
...
}
Or
JSONArray array = (JSONArray)new JSONTokener(jsonStr).nextValue();
for(int i = 0; i<array.length(); i++) {
JSONObject jsonObject = array.getJSONObject(i);
City city = new City();
city.name = jsonObject.getString("name");
...
}
You could use Jackson json parser as follows:-
you will need a value object for the point data.
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
public class Point {
private final String name;
private final String dateTime;
private final int dewpoint;
private final double airTemp;
#JsonCreator
public Point(#JsonProperty("name") final String name, #JsonProperty("date_time") final String dateTime, #JsonProperty("dewpoint") final int dewpoint, #JsonProperty("air_temp") final double airTemp) {
this.name = name;
this.dateTime = dateTime;
this.dewpoint = dewpoint;
this.airTemp = airTemp;
}
public String getName() {
return name;
}
public String getDateTime() {
return dateTime;
}
public int getDewpoint() {
return dewpoint;
}
public double getAirTemp() {
return airTemp;
}
}
Then this Jackson Object Mapper
// 2. Convert JSON to Java object
ObjectMapper mapper = new ObjectMapper();
Point[] points = mapper.readValue(new File("points.json"), Point[].class);
for (Point point : points) {
System.out.println("" + point.getName());
System.out.println("" + point.getDateTime());
System.out.println("" + point.getDewpoint());
System.out.println("" + point.getAirTemp());
}