How to use JsonConfig in Java to convert bean to JSON object and exclude certain properties?

#The JsonConfig class is a utility class that helps configure the serialization process. We can use the setExcludes() method of the JsonConfig class to convert a bean into a JSON object and exclude some of its properties, and pass this JSON configuration instance to the parameter of the static method fromObject() of JSONObject.

Syntax

public void setExcludes(String[] excludes)

In the below example, we can convert bean to a JSON object by excluding some of the properties.

Example

import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
public class BeanToJsonExcludeTest {
   public static void main(String[] args) {
      Student student = new Student("Raja", "Ramesh", 35, "Madhapur");
      JsonConfig jsonConfig = new JsonConfig();
      jsonConfig.setExcludes(new String[]{"age", "address"});
      JSONObject obj = JSONObject.fromObject(student, jsonConfig);
      System.out.println(obj.toString(3)); //pretty print JSON
   }
   public static class Student {
      private String firstName, lastName, address;
      private int age;
      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;
      }
   }
}

In the below The age and address attributes can be excluded from the output.

Output

{
   "firstName": "Raja",
   "lastName": "Ramesh"
}

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