java object to json and json to java object conversion

By using google gson jar, we can easily convert json to java and java to json conversion. You can download it from 'http://code.google.com/p/google-gson/'.

Example

public class Employee {
    String firstName;
    String lastName;
    int age;
    
    Employee(String firstName, String lastName, int age){
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;
    }
}

import com.google.gson.Gson;
 
public class JsonEx {
    public static void main(String[] args) {
    Employee obj = new Employee("Krishna", "Gurram", 26);
    Gson gson = new Gson();
 
        System.out.println("Converting employee object to json format");
    String json = gson.toJson(obj);
        
        System.out.println("Json format is");
        System.out.println(json);
        
        System.out.println("\nConverting json data to Employee object");
        Employee emp = gson.fromJson(json, Employee.class);

        System.out.println("Employee name " + emp.firstName);
        System.out.println("Employee last name " + emp.lastName);
        System.out.println("Employee age " + emp.age);
    }
}

Output

Converting employee object to json format
Json format is
{"firstName":"Krishna","lastName":"Gurram","age":26}

Converting json data to Employee object
Employee name Krishna
Employee last name Gurram
Employee age 26

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