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Thread: Importing Json object to Java object

  1. #1
    Join Date
    Aug 2009
    Posts
    20

    Question Importing Json object to Java object

    Hello Everyone,

    In my java application I have JSON object and i want to import this object to my Java Object (representing of my own class).

    I have done this task in C#,have been searching so much for Java,but could not
    find anything helpful. Can anyone suggest me how to deal with it???


    Thanks for Attention

  2. #2
    Join Date
    Oct 2005
    Posts
    843
    From google I found a blog post showing how to convert objects to and from JSON located here: http://www.mkyong.com/java/how-do-co...rmat-gson-api/, this uses the GSon library.

    First result from a google search of "convert java object from json"
    Last edited by welsh; 11-18-2011 at 12:56 AM.
    Welsh

  3. #3
    Join Date
    Aug 2009
    Posts
    20

    Question still searching for solution

    Tnx much for ur reply,

    I have seen before that JSON convertion, but i think you didnt get me. I want my JSON object to be serialized on the Object (That object is declared from my class, usually this class contains other objects declaration and so on).
    In C# I have created several classes. Then i have one biggest class containing other objects. Then I use JsonConvert.Import to Map whole JSon object to my object. Want to do the same in Java.

    Do u have any idea how to do this?

  4. #4
    Join Date
    Oct 2005
    Posts
    843
    I think I understand what your getting (maybe), so let me do a quick example.

    You have 3 classes like:
    Code:
    public class PojoOne
    {
    	private int id;
    	private String name;
    	private PojoTwo pojoTwo;
    
    	// Constructors, Getters and Setters below
    }
    
    public class PojoTwo
    {
    	private int id;
    	private ArrayList<PojoThree> pojoThreeList;
    
    	// Constructors, Getters and Setters below
    }
    
    public class PojoThree
    {
    	private int id;
    	private String name;
    	private String attribute;
    
    	// Constructors, Getters and Setters below
    }
    So as like you said, I have one class PojoOne which contains PojoTwo and that contains an ArrayList of PojoThree classes.

    You can convert this to JSON and back to a PojoOne object (and all its sub objects) with Gson like so:
    Code:
    public class App 
    {
        public static void main( String[] args )
        {
            PojoOne pojoOne = new PojoOne();
            
            pojoOne.setId(0);
            pojoOne.setName("myPojoOne");
            
            pojoOne.getPojoTwo().setId(1);
            pojoOne.getPojoTwo().getPojoThreeList().add(new PojoThree(2, "myPojoThree0", "hello world"));
            pojoOne.getPojoTwo().getPojoThreeList().add(new PojoThree(3, "myPojoThree1", "bye world"));
            
            Gson gson = new Gson();
            String json = gson.toJson(pojoOne);
            
            PojoOne obj = gson.fromJson(json, PojoOne.class);
        }
    }
    And this maps it all perfectly back. (From this small example I've shown).

    Is this what you were asking?
    Welsh

  5. #5
    Join Date
    Aug 2009
    Posts
    20

    Smile Thanks

    Thank you so much for ur help.

    I think am going correctly in my project.

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