BE THE CODER > JSON > JSON LIB Examples > Bean to JSON Exclude Filter

JSON-lib is a java library for serializing and de-serializing java beans, maps, arrays and collections in JSON format. Get the latest binaries from sourceforge http://json-lib.sourceforge.net/. This requires the libraries ( json-lib-2.4-jdk15.jar, xom-1.2.7.jar, ezmorph.jar commons-lang.jar, commons-collections.jar, commons-beanutils-1.7.jar and commons-logging-1.1.1.jar) to be in classpath. The following example shows converting a bean to JSON Object using exclude filter.

File Name :

com/bethecoder/tutorials/json_lib/common/Student.java


package com.bethecoder.tutorials.json_lib.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/json_lib/tests/Bean2JsonExcludeFilter.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.json_lib.tests;



import java.util.Date;



import net.sf.json.JSONObject;

import net.sf.json.JsonConfig;

import net.sf.json.util.PropertyFilter;



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



public class Bean2JsonExcludeFilter {



  /**

   * @param args

   */

  public static void main(String[] args) {

    Student stud = new Student("Sriram", "Kasireddi", 2, "Singing", new Date(110, 4, 6));

    

    JsonConfig jsonConfig = new JsonConfig();  

    jsonConfig.setJsonPropertyFilter(new PrimitevePropertyFilter());

    

    JSONObject obj = JSONObject.fromObject(stud, jsonConfig);

    System.out.println(obj.toString(2)); //pretty print with indent

  }

}



class PrimitevePropertyFilter implements PropertyFilter {

  @Override

  public boolean apply(Object source, String name, Object value) {

    //System.out.println("name = " + name + ", value = " + value);

    if (Number.class.isAssignableFrom(value.getClass()) ||

      String.class.isAssignableFrom(value.getClass())  ) {

      

      return false;

    }

    return true;

  }

}