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How to deserialize a JSON to Java object using the flexjson in Java?
The Flexjson is a lightweight library for serializing and deserializing Java objects into and from JSON format allowing both deep and shallow copies of objects. In order to run a Java program with flexjon, we need to import a flexjson package. We can deserialize a JSON to Java object using the deserialize() method of JSONDeserializer class, it takes as input a json string and produces a static typed object graph from that json representation. By default, it uses the class property in the json data in order to map the untyped generic json data into a specific Java type.
Syntax
public T deserialize(String input)
In the below program, deserialize a JSON to Java object
Example
import flexjson.*;
public class DeserializeJSONTest {
public static void main(String[] args) {
JSONDeserializer<Student> deserializer = new JSONDeserializer<Student>();
String jsonStr =
"{" +
"\"firstName\": \"Ravi\"," +
"\"lastName\": \"Chandra\"," +
"\"age\": 35," +
"\"class\": \"Student\"," +
"\"salary\": 50000.00," +
"}";
Student student = deserializer.deserialize(jsonStr);
System.out.println(student);
}
}
// Student class
class Student {
private String firstName;
private String lastName;
private int age;
private double salary;
public Student() {}
public Student(String firstName, String lastName, int age, double salary) {
super();
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
this.salary = salary;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public String toString() {
return "Student[ " +
"firstName = " + firstName +
", lastName = " + lastName +
", age = " + age +
", salary = " + salary +
" ]";
}
}Output
Student[ firstName = Ravi, lastName = Chandra, age = 35, salary = 50000.0 ]
Updated on: 04-Jul-2020
4K+ Views
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