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.
The Gson.fromJson() method deserializes the specified JSON into an object of the specified class.
Check out top GSON tutorial at Google GSON Tutorial.
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>
Java Gson fromJson() Example
The example uses fromJson() method to read JSON into a Java object.
import com.google.gson.Gson;
class User {
private final String firstName;
private final String lastName;
public User(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public String toString() {
return new StringBuilder().append("User{").append("First name: ")
.append(firstName).append(", Last name: ")
.append(lastName).append("}").toString();
}
}
public class GsonFromJson {
public static void main(String[] args) {
String json_string = "{\"firstName\":\"Tom\", \"lastName\": \"Broody\"}";
Gson gson = new Gson();
User user = gson.fromJson(json_string, User.class);
System.out.println(user);
}
}
Output:
User{First name: Tom, Last name: Broody}
Comments
Post a Comment