This example shows how to parse JSON Array into Java List using the Gson library.
Gson is a Java serialization/deserialization library to convert Java Objects into JSON and back. Gson was created by Google for internal use and later open-sourced.
Java Gson Maven dependency
This is a Maven dependency for Gson.
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.2</version>
</dependency>
Parsing JSON Array into List with Gson Example
In the example, we parse JSON Array into Java List using the Gson library.
package net.javaguides.gson;
import java.io.IOException;
import java.util.List;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
class Item {
private String name;
private int quantity;
@Override
public String toString() {
return "Item{" + "name=" + name + ", quantity=" + quantity + '}';
}
}
public class GsonReadList {
public static void main(String[] args) throws IOException {
Gson gson = new GsonBuilder().create();
String list = "[ {\"name\":\"chair\",\"quantity\":3}, " +
"{\"name\":\"book\",\"quantity\":5}, " +
"{\"name\":\"pencil\",\"quantity\":1} ]\r\n" +
"";
List < Item > items = gson.fromJson(list,
new TypeToken < List < Item >> () {}.getType());
items.forEach(System.out::println);
}
}
Output:
Item{name=chair, quantity=3}
Item{name=book, quantity=5}
Item{name=pencil, quantity=1}
Snippet to convert JSON array to List:
List<Item> items = gson.fromJson(list,
new TypeToken<List<Item>>(){}.getType());
Reference
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