How can we serialize a list of objects using flexjson in Java?


The Flexjson is a lightweight library for serializing and deserializing Java objects into and from JSON format. We can serialize a list of objects using the serialize() method of JSONSerializer class. This method can perform a shallow serialization of the target instance. We need to pass a list of objects of List type as an argument to the serialize() method.

Syntax

public String serialize(Object target)

Example

import flexjson.JSONSerializer;
import java.util.*;

public class JsonSerializeListTest {
   public static void main(String[] args) {
      JSONSerializer serializer = new JSONSerializer().prettyPrint(true); // pretty print JSON
      Student s1 = new Student("Raja", "Ramesh", 28, "Hyderabad");
      Student s2 = new Student("Suresh", "Kumar", 30, "Chennai");
      Student s3 = new Student("Surya", "Krishna", 35, "Pune");

      List<Student> students = Arrays.asList(s1, s2, s3);
      String jsonStr = serializer.serialize(students);
      System.out.println(jsonStr);
   }
}

// Student class
class Student {
   private String firstName;
   private String lastName;
   private int age;
   private String address;
   public Student() {}
   public Student(String firstName, String lastName, int age, String address) {
      super();
      this.firstName = firstName;
      this.lastName = lastName;
      this.age = age;
      this.address = address;
   }
   public String getFirstName() {
      return firstName;
   }
   public String getLastName() {
      return lastName;
   }
   public int getAge() {
      return age;
   }
   public String getAddress() {
      return address;
   }
   public String toString() {
      return "Student[ " +
             "firstName = " + firstName +
             ", lastName = " + lastName +
             ", age = " + age +
             ", address = " + address +
             " ]";
   }
}

Output

[
   {
      "address": "Hyderabad",
      "age": 28,
      "class": "Student",
      "firstName": "Raja",
      "lastName": "Ramesh"
   },
   {
      "address": "Chennai",
      "age": 30,
      "class": "Student",
      "firstName": "Suresh",
      "lastName": "Kumar"
   },
   {
      "address": "Pune",
      "age": 35,
      "class": "Student",
      "firstName": "Surya",
      "lastName": "Krishna"
   }
]
raja
Published on 11-Oct-2019 16:37:47
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