I am new to JSON..Am using HTTPUrlConnections and getting some response in JAVA program.The response data will be like,
{
"data": [
{
"id": 1,
"userId": 1,
"name": "ABC",
"modified": "2014-12-04",
"created": "2014-12-04",
"items": [
{
"email": "abc#gmail.com",
"links": [
{
.
.
.
.
}
]
}
]
}
]
}
From this response am able to get the value of "name" field with the below java code.
JSONArray items = newObj.getJSONArray("data");
for (int it=0 ; it < items.length() ; it++){
JSONObject contactItem = items.getJSONObject(it);
String userName = contactItem.getString("name");
System.out.println("Name----------"+userName);
}
But my requirement is,I need to get the value of "email" ..How should I code for that..
Any advice..
Thanks in advance..
Chitra
You need to first get the items array and each entry of this array contains JSONObject, from which you can call getString("email") .E.g.
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class App
{
public static void main( String[] args ) throws JSONException {
JSONObject newObj = new JSONObject("{" +
"\"data\": [\n" +
" {\n" +
"\"id\": 1,\n" +
" \"userId\": 1,\n" +
" \"name\": \"ABC\",\n" +
" \"modified\": \"2014-12-04\",\n" +
" \"created\": \"2014-12-04\",\n" +
" \"items\": [\n" +
" {\n" +
" \"email\": \"abc#gmail.com\",\n" +
" \"links\": [\n" +
" {\n" +
" }\n" +
" ]\n" +
" }\n" +
" ]\n" +
" }\n" +
" ]\n" +
"\n" +
"}");
JSONArray items = newObj.getJSONArray("data");
for (int it = 0; it < items.length(); it++) {
JSONObject contactItem = items.getJSONObject(it);
String userName = contactItem.getString("name");
JSONArray item = contactItem.getJSONArray("items");
for (int i = 0; i < items.length(); i++) {
String email = item.getJSONObject(i).getString("email");
System.out.println(email);
}
System.out.println("Name----------" + userName);
}
}
}
Output
abc#gmail.com
Name----------ABC
Extending your logic only:
JSONArray items = newObj.getJSONArray("data");
for (int it=0 ; it < items.length() ; it++){
JSONObject contactItem = items.getJSONObject(it);
String userName = contactItem.getString("name");
System.out.println("Name----------"+userName);
JSONArray itemsArr = contactItem.getJSONArray("items");
for (int item=0 ; item < itemsArr.length() ; item++){
String email = item.getString("email");
System.out.println("Email----------"+email);
}
}
This should work, with few tweaks. I have not actually tested it, just writing freehand here.
You can also use Jackson library from FasterXML. You can convert the JSON String into Java object very easily and then you can traverse using iterations on Collections.
If you look the JSON String it contains items which can be considered as an Array within an Array, so in order to get the value of email all you need to do is to create another JSONArray like:
JSONArray itemsArray = contactItem.getJSONArray("items");
Then you can retrieve the value of email over this Array
Thank you so much for your time and response.
The below code did the magic:
JSONArray responseContactData = responseContact.getJSONArray("data");
for (int i=0; i < responseContactData.length(); i++) {
String emails = contactDataValues.getJSONArray("items").getJSONObject(0).getString("email");
}
Related
I am trying to parse the below json but unable to do that as stack over flow error comes in.
Here is the JSON -
[{
"Class": "1",
"school": "test",
"description": "test",
"student": [
"Student1",
"Student2"
],
"qualify": true,
"annualFee": 3.00
}]
Here is the code which is failing currently.
String res = cspResponse.prettyPrint();
org.json.JSONObject obj = new org.json.JSONObject(res);
org.json.JSONArray arr = obj.getJSONArray(arrayName);
String dataStatus=null;
for (int i = 0; i < arr.length(); i++) {
dataStatus = arr.getJSONObject(i).getString(key);
System.out.println("dataStatus is \t" + dataStatus);
}
Usecases are:
To get the value key "class"
Get the value from Student
Get the value from school
I appreciate your help.
update-1
Code more info on stack trace updated with below details.
cls = 1
error- org.json.JSONException: JSONObject["student "] not a string.
Stack trace-
public String getString(String key) throws JSONException {
Object object = this.get(key);
if (object instanceof String) {
return (String) object;
}
throw new JSONException("JSONObject[" + quote(key) + "] not a string.");
}
When I ran the code with the below answers, here its failing for student is not a string.
The answers I used from first two comments and both have the same error. I appropriate your help.
Your json fragment is invalid - the last comma breaks the parsing. But the rest of the code is quite workable.
String res = "[\n" +
" {\n" +
" \"Class\": \"1\",\n" +
" \"school\": \"test\",\n" +
" \"description\": \"test\",\n" +
" \"student\": [\n" +
" \"Student1\",\n" +
" \"Student2\"\n" +
" ],\n" +
" \"qualify\": true,\n" +
" \"annualFee\": 3.00\n" +
" }\n" +
"]";
JSONArray arr = new JSONArray(res);
for (int i = 0; i < arr.length(); i++) {
JSONObject block = arr.getJSONObject(i);
Integer cls = block.getInt("Class");
System.out.println("cls = " + cls);
Object school = block.getString("school");
System.out.println("school = " + school);
JSONArray students = block.getJSONArray("student");
System.out.println("student[0] = " + students.get(0));
System.out.println("student[1] = " + students.get(1));
}
should output
cls = 1
school = test
student[0] = Student1
student[1] = Student2
Your JSON reponse root is array but you consider your JSON response as JSON object
Changing your parsing json code as below
String res=cspResponse.prettyPrint();
org.json.JSONArray arr = new org.json.JSONArray(res);
String dataStatus=null;
for (int i = 0; i < arr.length(); i++) {
org.json.JSONObject obj=arr.getJSONObject(i);
dataStatus = obj.getString(key);
System.out.println("dataStatus is \t" + dataStatus);
String schoolName = org.getString("school");
System.out.println("school => " + schoolName);
org.json.JSONArray students = obj.getJSONArray("student");
System.out.println("student[0] = " + students.get(0));
System.out.println("student[1] = " + students.get(1));
}
You can use simple JSONObject class and Simple JSONParser for parsing the JSON.
1. Parse the JSON.
org.json.simple.JSONParser parser = new org.json.simple.JSONParser();
org.json.simple.JSONObject parsedJSON = parser.parse(inputJSON);
2. To get class:
String class = parsedJSON.get("Class");
3. To get Students:
org.json.simple.JSONArray studentArray = parsedJSON.get("student");
4. To Get School:
String school = parsedJSON.get("school");
After the above steps, you can run a for-loop to print the class and students.
I have a JSON response and I want to store each element in a string. as I am new to JSON, its difficult to find the solution. please suggest me a solution.
the below is my json response.
{
"responseFlag": 1,
"responseMsg": "Successfully retrieved data",
"responseObj": [{
"assets": {
"asset_since": "",
"asset_type": "",
"comments": "",
"estimated_value": "",
"material_status": "SINGLE",
"ownership_of_assets": "",
"pep": "",
"source_of_income": ""
}
},
{
"assets": {
"asset_since": "",
"asset_type": "",
"comments": "",
"estimated_value": "",
"material_status": "SINGLE",
"ownership_of_assets": "",
"pep": "",
"source_of_income": ""
}
}
]
}
I want to store each object elements in an array.
the code I have tried is below.
package mytry;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class Mytry {
public static void main(String[] args) {
// TODO code application logic here
String response="{\n" +
" \"responseFlag\": 1,\n" +
" \"responseMsg\": \"Successfully retrieved data\",\n" +
" \"responseObj\": [\n" +
" {\n" +
" \"assets\": {\n" +
" \"asset_since\": \"\",\n" +
" \"asset_type\": \"\",\n" +
" \"comments\": \"\",\n" +
" \"estimated_value\": \"\",\n" +
" \"material_status\": \"SINGLE\",\n" +
" \"ownership_of_assets\": \"\",\n" +
" \"pep\": \"\",\n" +
" \"source_of_income\": \"\"\n" +
" }},\n" +
" {\n" +
" \"assets\": {\n" +
" \"asset_since\": \"\",\n" +
" \"asset_type\": \"\",\n" +
" \"comments\": \"\",\n" +
" \"estimated_value\": \"\",\n" +
" \"material_status\": \"SINGLE\",\n" +
" \"ownership_of_assets\": \"\",\n" +
" \"pep\": \"\",\n" +
" \"source_of_income\": \"\"\n" +
" }}]}";
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(response);
JSONObject jsonObject = (JSONObject) obj;
//System.out.println(jsonObject.toString());
System.out.println("json size=="+jsonObject.size());
System.out.println("hghgfh"+jsonObject.keySet());
Long sflag = (Long) jsonObject.get("responseFlag");
String msg=(String) jsonObject.get("responseMsg");
String resobj=(String) jsonObject.get("responseObj").toString();
//jsonObject.
System.out.println("sflag=="+sflag);
System.out.println("msg=="+msg);
System.out.println("msg=="+resobj);
// JSONArray msg = (JSONArray) jsonObject.get("responseFlag");
// Iterator<String> iterator = msg.iterator();
// while (iterator.hasNext()) {
// System.out.println(iterator.next());
// }
// for(Iterator iterator = jsonObject.keySet().iterator(); iterator.hasNext();) {
// String key = (String) iterator.next();
// System.out.println(jsonObject.get(key));
//}
// String asset = (String) jsonObject.get("assets");
// System.out.println("session token"+asset);
//sflag = (Long) jsonObject.get("responseFlag");
//System.out.println("session sflag"+sflag);
} catch (ParseException ex) {
System.out.println(ex);
}
}
}
the response object is
[{
"assets": {
"comments": "",
"asset_since": "",
"material_status": "SINGLE",
"source_of_income": "",
"ownership_of_assets": "",
"asset_type": "",
"pep": "",
"estimated_value": ""
}
}, {
"assets": {
"comments": "",
"asset_since": "",
"material_status": "SINGLE",
"source_of_income": "",
"ownership_of_assets": "",
"asset_type": "",
"pep": "",
"estimated_value": ""
}
}]
I need each asset values to be stored in an array.
Here is a pseudo code. You can fill the missing parts in this code.
String json = "{"responseFlag":1,"responseMsg":"Successfully retrieved data","responseObj":[{"assets":{"asset_since":"","asset_type":"","comments":"","estimated_value":"","material_status":"SINGLE","ownership_of_assets":"","pep":"","source_of_income":""}},{"assets":{"asset_since":"","asset_type":"","comments":"","estimated_value":"","material_status":"SINGLE","ownership_of_assets":"","pep":"","source_of_income":""}}]}";
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("responseObj");
for(int i=0; i<jsonArray.length(); i++)
{
JSONObject arrayJsonObject = jsonArray.getJSONObject(i);
//insert into your list or array
}
If you are using using json-simple-1.1.1 jar. here is the code below:
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(response);
JSONObject jsonObject = (JSONObject) obj;
//System.out.println(jsonObject.toString());
System.out.println("json size==" + jsonObject.size());
System.out.println("hghgfh" + jsonObject.keySet());
JSONArray jsonArray = (JSONArray)jsonObject.get("responseObj");
for(int i=0; i<jsonArray.size(); i++)
{
JSONObject arrayJsonObject = (JSONObject) jsonArray.get(i);
JSONObject assets = (JSONObject) arrayJsonObject.get("assets");
// read the assets to store
}
}catch (Exception e){
}
I want to extract jkl object from below JSON string. Also after extraction, I want the backslashes to be removed and extract further with the braces. I followed few questions on StackOverflow but it didn't help much.
{
"abc:def": {
"ghi": {
"jkl": "{\"mno:pqr\":{\"ty\":4,\"\\nsensing_service_name:\\\"Number\\\",\\nsensing_service_id: 20\\n}\\n ]\\n}\"}}",
"st": {
"op": 5,
"org": "q9wr9qrq"
},
"uvw": 1
},
"xyz": false
}
}
I tried below code to display jkl object but it is not working. Please suggest what is wrong in this and how to correct the same
JSONObject json = (JSONObject) JSONSerializer.toJSON(data);
JSONObject aa = json.getJSONObject("abc:def");
JSONObject bb = aa.getJSONObject("ghi");
JSONObject cc = bb.getJSONObject("jkl");
System.out.println(cc);
Hope this will help you:
import org.apache.commons.lang3.StringUtils;
import org.json.JSONObject;
public class TestClass {
public static void main(String[] args) throws Exception {
String jsonString = "{\n" +
" \"abc:def\": {\n" +
" \"ghi\": {\n" +
" \"jkl\": \"{\\\"mno:pqr\\\":{\\\"ty\\\":4,\\\"\\\\nsensing_service_name:\\\\\\\"Number\\\\\\\",\\\\nsensing_service_id: 20\\\\n}\\\\n ]\\\\n}\\\"}}\",\n" +
" \"st\": {\n" +
" \"op\": 5,\n" +
" \"org\": \"q9wr9qrq\"\n" +
" },\n" +
" \"uvw\": 1\n" +
" },\n" +
" \"xyz\": false\n" +
" }\n" +
"} ";
JSONObject jsonObject = new JSONObject(jsonString);
jsonObject = (JSONObject) jsonObject.get("abc:def");
jsonObject = (JSONObject) jsonObject.get("ghi");
String result = jsonObject.getString("jkl");
result = StringUtils.replace(result, "\\n", "");
System.out.println(result.replaceAll("\\\\",""));
}
}
[
"label": {
"originalName" : "Case #",
"modifiedLabel" : "Case #",
"labelId" : "case_number_lbl",
"isEditable" : "true",
"imageClass" : ""
}
]
In the above Json Array I need to replace "Case #" with "Ticket #". This is occuring in somany places. Any one update please.
Thanks In advance.
I think a simple loop should solve your problem:
public static void main(String[] args) throws JSONException {
JSONArray array = new JSONArray("[" +
" {" +
" originalName : \"Case #\"," +
" modifiedLabel : \"Case #\"," +
" labelId : \"case_number_lbl\"," +
" isEditable : \"true\"," +
" imageClass : \"\"" +
" }" +
"]");
System.out.println(array.toString(2));
for (int i = 0; i < array.length(); i++) {
JSONObject object = array.getJSONObject(i);
JSONArray keys = object.names();
for (int j = 0; j < keys.length(); j++) {
String key = keys.getString(j);
if (object.getString(key).equals("Case #")) {
object.put(key, "Ticket #");
}
}
}
System.out.println();
System.out.println(array.toString(2));
}
You can use GSON to convert your json to java Object and then you can change your string .
You can exchange the value with the help String.replaceAll()
String jSONString = ...; // Your JSon string
String newString = jSONString.replace("Case #", "Ticket #");
I am trying to parse a JSON string in java to have the individual value printed separately. But while making the program run I get the following error-
Exception in thread "main" java.lang.RuntimeException: Stub!
at org.json.JSONObject.<init>(JSONObject.java:7)
at ShowActivity.main(ShowActivity.java:29)
My Class looks like-
import org.json.JSONException;
import org.json.JSONObject;
public class ShowActivity {
private final static String jString = "{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " }"
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " }"
+ " ]"
+ "}";
private static JSONObject jObject = null;
public static void main(String[] args) throws JSONException {
jObject = new JSONObject(jString);
JSONObject geoObject = jObject.getJSONObject("geodata");
String geoId = geoObject.getString("id");
System.out.println(geoId);
String name = geoObject.getString("name");
System.out.println(name);
String gender=geoObject.getString("gender");
System.out.println(gender);
String lat=geoObject.getString("latitude");
System.out.println(lat);
String longit =geoObject.getString("longitude");
System.out.println(longit);
}
}
Let me know what is it I am missing, or the reason why I do get that error everytime I run the application. Any comments would be appreciated.
See my comment.
You need to include the full org.json library when running as android.jar only contains stubs to compile against.
In addition, you must remove the two instances of extra } in your JSON data following longitude.
private final static String JSON_DATA =
"{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " ]"
+ "}";
Apart from that, geodata is in fact not a JSONObject but a JSONArray.
Here is the fully working and tested corrected code:
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class ShowActivity {
private final static String JSON_DATA =
"{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " ]"
+ "}";
public static void main(final String[] argv) throws JSONException {
final JSONObject obj = new JSONObject(JSON_DATA);
final JSONArray geodata = obj.getJSONArray("geodata");
final int n = geodata.length();
for (int i = 0; i < n; ++i) {
final JSONObject person = geodata.getJSONObject(i);
System.out.println(person.getInt("id"));
System.out.println(person.getString("name"));
System.out.println(person.getString("gender"));
System.out.println(person.getDouble("latitude"));
System.out.println(person.getDouble("longitude"));
}
}
}
Here's the output:
C:\dev\scrap>java -cp json.jar;. ShowActivity
1
Julie Sherman
female
37.33774833333334
-121.88670166666667
2
Johnny Depp
male
37.336453
-121.884985
To convert your JSON string to hashmap you can make use of this :
HashMap<String, Object> hashMap = new HashMap<>(Utility.jsonToMap(response)) ;
Use this class :) (handles even lists , nested lists and json)
public class Utility {
public static Map<String, Object> jsonToMap(Object json) throws JSONException {
if(json instanceof JSONObject)
return _jsonToMap_((JSONObject)json) ;
else if (json instanceof String)
{
JSONObject jsonObject = new JSONObject((String)json) ;
return _jsonToMap_(jsonObject) ;
}
return null ;
}
private static Map<String, Object> _jsonToMap_(JSONObject json) throws JSONException {
Map<String, Object> retMap = new HashMap<String, Object>();
if(json != JSONObject.NULL) {
retMap = toMap(json);
}
return retMap;
}
private static Map<String, Object> toMap(JSONObject object) throws JSONException {
Map<String, Object> map = new HashMap<String, Object>();
Iterator<String> keysItr = object.keys();
while(keysItr.hasNext()) {
String key = keysItr.next();
Object value = object.get(key);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
map.put(key, value);
}
return map;
}
public static List<Object> toList(JSONArray array) throws JSONException {
List<Object> list = new ArrayList<Object>();
for(int i = 0; i < array.length(); i++) {
Object value = array.get(i);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
list.add(value);
}
return list;
}
}
credit to this blog
This answer may help someone whose requirements are different.
This is your Json string
{
"pageNumber":20,
"pageTitle":"example page title",
"pageInfo": {
"pageName": "Homepage",
"logo": "https://www.example.com/logo.jpg"
},
"posts": [
{
"post_id": "0123456789",
"actor_id": "1001",
"author_name": "Jane Doe",
"post_title": "How to parse JSON in Java",
"comments": [],
"time_of_post": "1234567890"
}
]
}
and this is how to read it
import org.json.JSONArray;
import org.json.JSONObject;
public class ParseJSON {
static String json = "...";
public static void main(String[] args) {
JSONObject obj = new JSONObject(json);
String pageTitle = obj.getString("pageTitle");
String pageNumber= obj.getInt("pageNumber");
String pageName = obj.getJSONObject("pageInfo").getString("pageName");
System.out.println(pageNumber);
System.out.println(pageTitle );
System.out.println(pageName);
JSONArray arr = obj.getJSONArray("posts");
for (int i = 0; i < arr.length(); i++) {
String post_id = arr.getJSONObject(i).getString("post_id");
System.out.println(post_id);
}
}
}
Looks like for both of your objects (inside the array), you have an extra closing brace after "Longitude".
Firstly there is an extra } after every array object.
Secondly "geodata" is a JSONArray. So instead of JSONObject geoObject = jObject.getJSONObject("geodata"); you have to get it as JSONArray geoObject = jObject.getJSONArray("geodata");
Once you have the JSONArray you can fetch each entry in the JSONArray using geoObject.get(<index>).
I am using org.codehaus.jettison.json.
Here is the example of one Object, For your case you have to use JSONArray.
public static final String JSON_STRING="{\"employee\":{\"name\":\"Sachin\",\"salary\":56000}}";
try{
JSONObject emp=(new JSONObject(JSON_STRING)).getJSONObject("employee");
String empname=emp.getString("name");
int empsalary=emp.getInt("salary");
String str="Employee Name:"+empname+"\n"+"Employee Salary:"+empsalary;
textView1.setText(str);
}catch (Exception e) {e.printStackTrace();}
//Do when JSON has problem.
}
I don't have time but tried to give an idea. If you still can't do it, then I will help.
you have an extra "}" in each object,
you may write the json string like this:
public class ShowActivity {
private final static String jString = "{"
+ " \"geodata\": ["
+ " {"
+ " \"id\": \"1\","
+ " \"name\": \"Julie Sherman\","
+ " \"gender\" : \"female\","
+ " \"latitude\" : \"37.33774833333334\","
+ " \"longitude\" : \"-121.88670166666667\""
+ " }"
+ " },"
+ " {"
+ " \"id\": \"2\","
+ " \"name\": \"Johnny Depp\","
+ " \"gender\" : \"male\","
+ " \"latitude\" : \"37.336453\","
+ " \"longitude\" : \"-121.884985\""
+ " }"
+ " }"
+ " ]"
+ "}";
}