How to convert a String to JsonObject using gson library
JavaJsonGsonJava Problem Overview
Please advice how to convert a String
to JsonObject
using gson
library.
What I unsuccesfully do:
String string = "abcde";
Gson gson = new Gson();
JsonObject json = new JsonObject();
json = gson.toJson(string); // Can't convert String to JsonObject
Java Solutions
Solution 1 - Java
You can convert it to a JavaBean if you want using:
Gson gson = new GsonBuilder().setPrettyPrinting().create();
gson.fromJson(jsonString, JavaBean.class)
To use JsonObject, which is more flexible, use the following:
String json = "{\"Success\":true,\"Message\":\"Invalid access token.\"}";
JsonParser jsonParser = new JsonParser();
JsonObject jo = (JsonObject)jsonParser.parse(json);
Assert.assertNotNull(jo);
Assert.assertTrue(jo.get("Success").getAsString());
Which is equivalent to the following:
JsonElement jelem = gson.fromJson(json, JsonElement.class);
JsonObject jobj = jelem.getAsJsonObject();
Solution 2 - Java
To do it in a simpler way, consider below:
JsonObject jsonObject = (new JsonParser()).parse(json).getAsJsonObject();
Solution 3 - Java
String string = "abcde"; // The String which Need To Be Converted
JsonObject convertedObject = new Gson().fromJson(string, JsonObject.class);
I do this, and it worked.
Solution 4 - Java
You don't need to use JsonObject
. You should be using Gson to convert to/from JSON strings and your own Java objects.
See the Gson User Guide:
> (Serialization) > > Gson gson = new Gson(); > gson.toJson(1); // prints 1 > gson.toJson("abcd"); // prints "abcd" > gson.toJson(new Long(10)); // prints 10 > int[] values = { 1 }; > gson.toJson(values); // prints [1] > > (Deserialization) > > int one = gson.fromJson("1", int.class); > Integer one = gson.fromJson("1", Integer.class); > Long one = gson.fromJson("1", Long.class); > Boolean false = gson.fromJson("false", Boolean.class); > String str = gson.fromJson(""abc"", String.class); > String anotherStr = gson.fromJson("["abc"]", String.class)
Solution 5 - Java
Looks like the above answer did not answer the question completely.
I think you are looking for something like below:
class TransactionResponse {
String Success, Message;
List<Response> Response;
}
TransactionResponse = new Gson().fromJson(response, TransactionResponse.class);
where my response is something like this:
{"Success":false,"Message":"Invalid access token.","Response":null}
As you can see, the variable name should be same as the Json string representation of the key in the key value pair. This will automatically convert your gson string to JsonObject.
Solution 6 - Java
String emailData = {"to": "[email protected]","subject":"User details","body": "The user has completed his training"
}
// Java model class
public class EmailData {
public String to;
public String subject;
public String body;
}
//Final Data
Gson gson = new Gson();
EmailData emaildata = gson.fromJson(emailData, EmailData.class);
Solution 7 - Java
Gson gson = new Gson();
YourClass yourClassObject = new YourClass();
String jsonString = gson.toJson(yourClassObject);
Solution 8 - Java
Note that as of Gson 2.8.6, instance method JsonParser.parse
has been deprecated and replaced by static method JsonParser.parseString
:
JsonObject jsonObject = JsonParser.parseString(json).getAsJsonObject();
Solution 9 - Java
JsonObject jsonObject = (JsonObject) new JsonParser().parse("YourJsonString");
Solution 10 - Java
if you just want to convert string to json then use:
use org.json: https://mvnrepository.com/artifact/org.json/json/20210307
<!-- https://mvnrepository.com/artifact/org.json/json -->
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20210307</version>
</dependency>
import these
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONArray;
Now convert it as
//now you can convert string to array and object without having complicated maps and objects
try {
JSONArray jsonArray = new JSONArray("[1,2,3,4,5]");
//you can give entire jsonObject here
JSONObject jsonObject= new JSONObject("{\"name\":\"test\"}") ;
System.out.println("outputarray: "+ jsonArray.toString(2));
System.out.println("outputObject: "+ jsonObject.toString(2));
}catch (JSONException err){
System.out.println("Error: "+ err.toString());
}