SimpleJson: String to JSONArray - java

I get the following JSON:
[
{
"user_id": "someValue"
}
]
It's saved inside a String.
I would like to convert it to a JSONObject which fails (as the constructor assumes a JSON to start with {). As this doesn't seem to be possible I'd like to convert it to a JSONArray. How can I do that with SimpleJson?


JSONParser parser = new JSONParser();
JSONArray array = (JSONArray)parser.parse("[{\"user_id\": 1}]");
System.out.println(((JSONObject)array.get(0)).get("user_id"));
You need to cast to a JSONArray as that is what the string contains.


For your task you could use code as bellow:
String t = "[{\"user_id\": \"someValue\"}]";
JSONParser parser = new JSONParser();
JSONArray obj = (JSONArray) parser.parse(t);
System.out.println(obj.get(0));
And result would be JSONObject.


String actualJsonObject = // assuming that this variable contains actual object what ever u want to pass as per your question says
JSONParser parser = new JSONParser();
JSONArray userdataArray= (JSONArray) parser.parse(actualJsonObject );
if(userdataArray.size()>0){
for (Object user : userdataArray) {
JSONObject jsonrow=(JSONObject)parser.parse(String.valueOf(user));
String User_Id= (String)jsonrow.get("user_Id"); \\ Each User_Id will be displayed.
} else{
System.out.println("Empty Array....");
}


It works for me.
String jsonString = "[{\"user_id\": \"someValue\"}]";
JSONArray jsonArray = new JSONArray();
JSONParser parser = new JSONParser();
try {
jsonArray = (JSONArray) parser.parse(js);
} catch (ParseException e) {
e.printStackTrace();
}

Related

Parse JSON having both Escape & Unescape characters in JAVA using Jayway

I receive the below json as an input to my program:
{
"shopping": {
"cart": {
"items": [{
"iturl" : "https://www.google.com/",
"itdesc" : "Item’s box includes the below contents:\n a.adaptor \n b.sdfd"
}]
}
}
}
We are using jayway jsonpath to parse this data and do some processing and return the final value as a string.
when we parse it with the default jsonpath configuration, I get the iturl modified as "https:\/\/www.google.com\/"
Tried changing the JSONProvider to JacksonJsonProvider (by referring Jsonpath with Jackson or Gson) and the issue with the url is solved but, the value of itdesc is now coming to new line (due to \n) making it an invalid json.
I cannot specifically handle for each field as the incoming data will be dynamic.
Is there any proper way to parse this kind of JSON in java. Thanks in advance for your help

Try adding one more escaping level before parsing the string, the string parser's gonna give you "\n" for "\\n".
For example, parsing with Jackson ObjectMapper.
objectMapper.readValue(jsonString.replace("\\", "\\\\"), Any.class);

{
"shopping": { <-- JSONObject
"cart": { <-- JSONObject
"items": [{ <-- JSONArray
"iturl" : "https://www.google.com/", <-- JSONObject inside JSONAray
"itdesc" : "Item’s box includes the below contents:\n a.adaptor \n b.sdfd"
}]
}
}
}
if this data json come from http connection.
this json must be a string format fisrt,
and try using org.json.simple
so do like this :
private void readData() {
String Body = (response json string from connection);
JSONParser parse = new JSONParser();
String iturl = null;
String itdesc = null;
try {
JSONObject shopping = (JSONObject) parse.parse(Body);
JSONObject cart= (JSONObject) shopping.get("cart");
JSONArray items = (JSONArray ) cart.get("items ");
items.forEach((k)-> {
JSONObject inside = (JSONObject) k;
iturl = inside.get("iturl");
itdesc = inside.get("itdesc");
});
}catch ( ParseException e) {
e.printStackTrace();
}
}
if this come from file.json combine with reader :
private static final File jsonData = new File(file.json);
private void callData() {
String iturl = null;
String itdesc = null;
try {
Reader reader = new FileReader(marketList);
JSONParser parse = new JSONParser();
JSONObject shopping = (JSONObject) parse.parse(reader);
JSONObject cart= (JSONObject) shopping.get("cart");
JSONArray items = (JSONArray ) cart.get("items ");
items.forEach((k)-> {
JSONObject inside = (JSONObject) k;
iturl = inside.get("iturl");
itdesc = inside.get("itdesc");
});
} catch (IOException | ParseException e) {
e.printStackTrace();
}
}

How to Read Json array values from file

JSONArray jsonArray = (JSONArray) obj;
When I use the above code, it shows the error message:
java.lang.ClassCastException: org.json.simple.JSONObject cannot be cast to org.json.simple.JSONArray
Please anyone suggest any method to overcome this error or any other way to read json value form a file in Java (Desktop application).

Use this for get json value in string format from file
public String loadJSONFromFile() {
String json = null;
try {
InputStream is = getActivity().getAssets().open("yourfilename.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
JsonObject is a child of a JsonArray, so as per my suggestion use like this
final JSONArray jsonArray = new JSONArray();
jsonArray.put(obj); //obj is your JsonObject
and you can get JsonObject from array like
jsonArray.getJSONObject(0); //0 is index of your JsonObject in JsonArray
Hope this help you.

Check the content of the file.
It seems that the content is not an array, but a json object.
Open the file with a text editor. If the content is something like:
{ // First character
... content here
} // Last character
it is an object, if it is similar to
[ // First character
... content here
] // Last character
it is an array.
If you need to read an object you need to change your code as follow:
JSONObject jsonObject = (JSONObject) obj;

JSONArray jsonArray = (JSONArray) obj;
This obj is of JsonObject type, so change that line to
JSONObject jsonObject = (JSONObject)obj;

Extract Fields from a Json String in Java

I am trying to extract the ids from each company_id from the following Json String
String test = ["{\"company_id\":4100,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\":1446132360498,\"anon_optout_date\":0,\"anon_last_form_date\":1446132360498,\"anon_last_form_id\":101,\"anon_last_promo_id\":1002003,\"last_registration_date\":1446132360498,\"mp_status_id\":600,\"mp_control_state\":-1,\"mp_match_date\":0,\"mp_vs_version\":0,\"mp_initial_value_segment\":0,\"mp_id\":0,\"conversion_last_form_date\":0,\"conversion_last_form_id\":0,\"conversion_last_promo_id\":-1,\"last_message_date\":1446132368928,\"cg_version\":0,\"cg_version_date\":0,\"num_anon_messages_global\":0,\"num_anon_messages_global_date\":0,\"reg_creator_id\":576,\"reg_form_id\":101,\"reg_method_id\":1,\"reg_creator_type_id\":1},\"personal_data\":{\"version\":0,\"personal_data\":\"{}\",\"mdc_data\":{\"version\":0},\"custom_data\":\"{}\"},\"category_data\":{},\"campaignImpressions\":{},\"journeyStartDate\":0}","{\"company_id\":4045,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\":1446132360498,\"anon_optout_date\":0,\"anon_last_form_date\":1446132360498,\"anon_last_form_id\":101,\"anon_last_promo_id\":1002003,\"last_registration_date\":1446132360498,\"mp_status_id\":600,\"mp_control_state\":-1,\"mp_match_date\":0,\"mp_vs_version\":0,\"mp_initial_value_segment\":0,\"mp_id\":0,\"conversion_last_form_date\":0,\"conversion_last_form_id\":0,\"conversion_last_promo_id\":-1,\"last_message_date\":1446132368928,\"cg_version\":0,\"cg_version_date\":0,\"num_anon_messages_global\":0,\"num_anon_messages_global_date\":0,\"reg_creator_id\":576,\"reg_form_id\":101,\"reg_method_id\":1,\"reg_creator_type_id\":1},\"personal_data\":{\"version\":0,\"personal_data\":\"{}\",\"mdc_data\":{\"version\":0},\"custom_data\":\"{}\"},\"category_data\":{},\"campaignImpressions\":{},\"journeyStartDate\":0}","{\"company_id\":2979,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\":1446132360498,\"anon_optout_date\":0,\"anon_last_form_date\":1446132360498,\"anon_last_form_id\":101,\"anon_last_promo_id\":1002003,\"last_registration_date\":1446132360498,\"mp_status_id\":600,\"mp_control_state\":-1,\"mp_match_date\":0,\"mp_vs_version\":0,\"mp_initial_value_segment\":0,\"mp_id\":0,\"conversion_last_form_date\":0,\"conversion_last_form_id\":0,\"conversion_last_promo_id\":-1,\"last_message_date\":1446132368928,\"cg_version\":0,\"cg_version_date\":0,\"num_anon_messages_global\":0,\"num_anon_messages_global_date\":0,\"reg_creator_id\":576,\"reg_form_id\":101,\"reg_method_id\":1,\"reg_creator_type_id\":1},\"personal_data\":{\"version\":0,\"personal_data\":\"{}\",\"mdc_data\":{\"version\":0},\"custom_data\":\"{}\"},\"category_data\":{},\"campaignImpressions\":{},\"journeyStartDate\":0}"]
I am very new to working with Json. This is what I have so far:
JSONObject jsonObject = new JSONObject(test);
JSONObject newJSON = jsonObject.getJSONObject("company_id");
System.out.println(newJSON.toString());
jsonObject = new JSONObject(newJSON.toString());
I am stuck here because I honestly do not know how would I extract the company_id.
Thank you for your time and patience.

String test = ["{\"company_id\":4100,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\":1446132360498,\"anon_optout_date\":0,\"anon_last_form_date\":1446132360498,\"anon_last_form_id\":101,\"anon_last_promo_id\":1002003,\"last_registration_date\":1446132360498,\"mp_status_id\":600,\"mp_control_state\":-1,\"mp_match_date\":0,\"mp_vs_version\":0,\"mp_initial_value_segment\":0,\"mp_id\":0,\"conversion_last_form_date\":0,\"conversion_last_form_id\":0,\"conversion_last_promo_id\":-1,\"last_message_date\":1446132368928,\"cg_version\":0,\"cg_version_date\":0,\"num_anon_messages_global\":0,\"num_anon_messages_global_date\":0,\"reg_creator_id\":576,\"reg_form_id\":101,\"reg_method_id\":1,\"reg_creator_type_id\":1},\"personal_data\":{\"version\":0,\"personal_data\":\"{}\",\"mdc_data\":{\"version\":0},\"custom_data\":\"{}\"},\"category_data\":{},\"campaignImpressions\":{},\"journeyStartDate\":0}","{\"company_id\":4045,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\":1446132360498,\"anon_optout_date\":0,\"anon_last_form_date\":1446132360498,\"anon_last_form_id\":101,\"anon_last_promo_id\":1002003,\"last_registration_date\":1446132360498,\"mp_status_id\":600,\"mp_control_state\":-1,\"mp_match_date\":0,\"mp_vs_version\":0,\"mp_initial_value_segment\":0,\"mp_id\":0,\"conversion_last_form_date\":0,\"conversion_last_form_id\":0,\"conversion_last_promo_id\":-1,\"last_message_date\":1446132368928,\"cg_version\":0,\"cg_version_date\":0,\"num_anon_messages_global\":0,\"num_anon_messages_global_date\":0,\"reg_creator_id\":576,\"reg_form_id\":101,\"reg_method_id\":1,\"reg_creator_type_id\":1},\"personal_data\":{\"version\":0,\"personal_data\":\"{}\",\"mdc_data\":{\"version\":0},\"custom_data\":\"{}\"},\"category_data\":{},\"campaignImpressions\":{},\"journeyStartDate\":0}","{\"company_id\":2979,\"data\":{\"drm_user_id\":572901936637129135,\"direct_status_id\":0,\"direct_optin_date\":0,\"direct_first_optin_date\":0,\"direct_last_optin_date\":0,\"direct_optout_date\":0,\"direct_last_form_date\":0,\"direct_last_form_id\":0,\"direct_last_promo_id\":0,\"anon_status_id\":600,\"anon_optin_date\":1446132360498,\"anon_first_optin_date\":1446132360498,\"anon_last_optin_date\":1446132360498,\"anon_optout_date\":0,\"anon_last_form_date\":1446132360498,\"anon_last_form_id\":101,\"anon_last_promo_id\":1002003,\"last_registration_date\":1446132360498,\"mp_status_id\":600,\"mp_control_state\":-1,\"mp_match_date\":0,\"mp_vs_version\":0,\"mp_initial_value_segment\":0,\"mp_id\":0,\"conversion_last_form_date\":0,\"conversion_last_form_id\":0,\"conversion_last_promo_id\":-1,\"last_message_date\":1446132368928,\"cg_version\":0,\"cg_version_date\":0,\"num_anon_messages_global\":0,\"num_anon_messages_global_date\":0,\"reg_creator_id\":576,\"reg_form_id\":101,\"reg_method_id\":1,\"reg_creator_type_id\":1},\"personal_data\":{\"version\":0,\"personal_data\":\"{}\",\"mdc_data\":{\"version\":0},\"custom_data\":\"{}\"},\"category_data\":{},\"campaignImpressions\":{},\"journeyStartDate\":0}"]
JSONParser parser = new JSONParser();
Object obj = parser.parse(test);
JSONArray array = (JSONArray)obj;
System.out.println(array.get("company_id"));

I think there is a object array. I think you can get you answer using following way.
for(int i=0;i<array.length();i++){
String company_id=array.getJSONObject(i).getString("company_id");
}

How to get the data from the Json file in the following Code

I am new to json so please help me to get solve this
propertyAlerts: [
{
alertDomain: "oiq.core.alert.PropertyAlert",
alertType: "HERITAGE_DETECTED",
oiqCreatedDate: "2013-11-04 03:06:26"
}]
By using java, I want to get the following data
OUTPUT:
alertDomain: "oiq.core.alert.PropertyAlert"
alertType: "HERITAGE_DETECTED"
oiqCreatedDate: "2013-11-04 03:06:26"
The following is used by me
public void checklicense(String filename) throws Exception
{
JSONParser parser=new JSONParser();
Object obj = parser.parse(new FileReader("./output_profiles/"+filename));
JSONObject jsonObject = (JSONObject) obj;
JSONArray jsonMainArr = obj.getJSONArray("propertyalert");
JSONObject childJSONObject = jsonMainArr.getJSONObject(i);
String alertDomain = childJSONObject.getString("alertDomain");
}
Can any one help me to solve this problem

This tutorial explains the basics of JSON parsing.
I would recommend you to read the entire post as it is something that you will do almost daily in Android development.

public static void checklicense(String filename)
{
try {
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader(filename));
System.out.println(obj.getClass());
JSONObject jsonObject = (JSONObject) obj;
JSONArray jsonMainArr = (JSONArray) jsonObject.get("propertyAlerts");
Iterator iterator = jsonMainArr.iterator();
while(iterator.hasNext()) {
jsonObject =(JSONObject) iterator.next();
String alertDomain = (String) jsonObject.get("alertDomain");
String alertType = (String) jsonObject.get("alertType");
System.out.println("alertDomain " + alertDomain + ", alertType " + alertType );
}
} catch (Exception ex) {
java.util.logging.Logger.getLogger(EosClient.class.getName()).log(Level.SEVERE, null, ex);
}
}
The above code produces the required output for a valid json input
{
"propertyAlerts": [
{
"alertDomain": "oiq.core.alert.PropertyAlert",
"alertType": "HERITAGE_DETECTED",
"oiqCreatedDate": "2013-11-04 03:06:26"
}
]
}

org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject

I'm trying to parse below json file:
{"units":[{"id":42,
"title":"Hello World",
"position":1,
"v_id":9,
"sites":[[{"id":316,
"article":42,
"clip":133904
}],
{"length":5}]
}, ..]}
This is what I have tried:
Object obj = null;
JSONParser parser = new JSONParser();
Object unitsObj = parser.parse(new FileReader("file.json");
JSONObject unitsJson = (JSONObject) unitsObj;
JSONArray units = (JSONArray) unitsJson.get("units");
Iterator<String> unitsIterator = units.iterator();
while(unitsIterator.hasNext()){
Object uJson = unitsIterator.next();
JSONObject uj = (JSONObject) uJson;
obj = parser.parse(uj.get("sites").toString());
JSONArray jsonSites = (JSONArray) obj;
for(int i=0;i<jsonSites.size();i++){
JSONObject site = (JSONObject)jsonSites.get(i); // Exception happens here.
System.out.println(site.get("article");
}
}
The code is not working when I try to parse the inner json array, so I get:
Exception in thread "main" java.lang.ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject
The exception is pointing to this line:
JSONObject site = (JSONObject)jsonSites.get(i);
Any help? tnx.

I've found a working code:
JSONParser parser = new JSONParser();
Object obj = parser.parse(content);
JSONArray array = new JSONArray();
array.add(obj);
If you don't need the array (like the author), you can simply use
JSONParser parser = new JSONParser();
Object obj = parser.parse(content);

The first element of the sites array is an array, as you can see indenting the JSON:
{"units":[{"id":42,
...
"sites":
[
[
{
"id":316,
"article":42,
"clip":133904
}
],
{"length":5}
]
...
}
Therefore you need to treat its value accordingly; probably you could do something like:
JSONObject site = (JSONObject)(((JSONArray)jsonSites.get(i)).get(0));

this worked:
System.out.println("resultList.toString() " + resultList);
org.json.JSONObject obj = new JSONObject(resultList);
org.json.JSONArray jsonArray = obj.getJSONArray(someField);
for(int i=0;i<jsonArray.length();i++){
System.out.println("array is " + jsonArray.get(i));
}

JSONObject site=jsonSites.getJSONObject(i) should work out

JSONObject obj=(JSONObject)JSONValue.parse(content);
JSONArray arr=(JSONArray)obj.get("units");
System.out.println(arr.get(1)); //this will print {"id":42,...sities ..}
#cyberz is right but explain it reverse

You can first read the whole content of file into a String.
FileInputStream fileInputStream = null;
String data="";
StringBuffer stringBuffer = new StringBuffer("");
try{
fileInputStream=new FileInputStream(filename);
int i;
while((i=fileInputStream.read())!=-1)
{
stringBuffer.append((char)i);
}
data = stringBuffer.toString();
}
catch(Exception e){
LoggerUtil.printStackTrace(e);
}
finally{
if(fileInputStream!=null){
fileInputStream.close();
}
}
Now You will have the whole content into String ( data variable ).
JSONParser parser = new JSONParser();
org.json.simple.JSONArray jsonArray= (org.json.simple.JSONArray) parser.parse(data);
After that you can use jsonArray as you want.

If you want to re-filter the json data you can use following method. Given example is getting all document data from couchdb.
{
Gson gson = new Gson();
String resultJson = restTemplate.getForObject(url+"_all_docs?include_docs=true", String.class);
JSONObject object = (JSONObject) new JSONParser().parse(resultJson);
JSONArray rowdata = (JSONArray) object.get("rows");
List<Object>list=new ArrayList<Object>();
for(int i=0;i<rowdata.size();i++) {
JSONObject index = (JSONObject) rowdata.get(i);
JSONObject data = (JSONObject) index.get("doc");
list.add(data);
}
// convert your list to json
String devicelist = gson.toJson(list);
return devicelist;
}

JSONObject site = (JSONObject)jsonSites.get(i); // Exception happens here.
The return type of jsonSites.get(i) is JSONArray not JSONObject.
Because sites have two '[', two means there are two arrays here.

use your jsonsimpleobject direclty like below
JSONObject unitsObj = parser.parse(new FileReader("file.json");

JSONObject baseReq
LinkedHashMap insert = (LinkedHashMap) baseReq.get("insert");
LinkedHashMap delete = (LinkedHashMap) baseReq.get("delete");

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