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 JSON > FLEX JSON > How to Deserialize JSON String into an existing Object

How to Deserialize JSON String into an existing Object 

Flexjson is a lightweight java library for serializing and de-serializing java beans, maps, arrays and collections in JSON format. Get the latest binaries from https://sourceforge.net/projects/flexjson/. This requires the library flexjson-2.1.jar to be in classpath. The following example shows how to Deserialize and populate an existing Java Object from the given JSON String.

File Name  :  
com/bethecoder/tutorials/flexjson/common/Student.java 
   
package com.bethecoder.tutorials.flexjson.common;

import java.util.Date;

public class Student {
  private String firstName;
  private String lastName;
  private int age;
  private String hobby;
  private Date dob;

  public Student() {}
  
  public Student(String firstName, String lastName, int age, String hobby,
      Date dob) {
    super();
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
    this.hobby = hobby;
    this.dob = dob;
  }
  
  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 String getHobby() {
    return hobby;
  }

  public void setHobby(String hobby) {
    this.hobby = hobby;
  }
  public Date getDob() {
    return dob;
  }
  public void setDob(Date dob) {
    this.dob = dob;
  }

  public String toString() {
    return "Student[ " +
      "firstName = " + firstName +
      ", lastName = " + lastName +
      ", age = " + age +
      ", hobby = " + hobby +
      ", dob = " + dob +
      " ]";
  }
}
   

File Name  :  
com/bethecoder/tutorials/flexjson/tests/DeserializeTest3.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.flexjson.tests;

import java.util.Date;

import com.bethecoder.tutorials.flexjson.common.Student;

import flexjson.JSONDeserializer;

public class DeserializeTest3 {

  /**
   @param args
   */
  public static void main(String[] args) {

    Student std = new Student("Sriram""Kasireddi"2"Singing"new Date());
    System.out.println(std);
    
    JSONDeserializer<Student> deserializer = new JSONDeserializer<Student>();
    String jsonStr =
      "{" +
          "\"age\": 4," +
          "\"hobby\": \"Kick Boxing\"" +
      "}";
    
    std = deserializer.deserializeInto(jsonStr, std);
    System.out.println(std);
  }

}
   

It gives the following output,
Student[ firstName = Sriram, lastName = Kasireddi, age = 2, 
	hobby = Singing, dob = Thu Jul 12 02:18:23 IST 2012 ]
Student[ firstName = Sriram, lastName = Kasireddi, age = 4, 
	hobby = Kick Boxing, dob = Thu Jul 12 02:18:23 IST 2012 ]


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