BE THE CODER > Tools and Libs > Commons Bean Utils Examples

Apache Commons BeanUtils is a java library useful for accessing bean properties and methods. It provides introspection capabilities to view and manipulate the properties and operations provided by the given class. This requires the libraries commons-beanutils-1.8.3.jar, commons-beanutils-bean-collections-1.8.3.jar, commons-beanutils-core-1.8.3.jar, commons-collections-3.2.1.jar, commons-logging.jar to be in classpath. The following example shows using ConstructorUtils.getAccessibleConstructor() API. It returns a constructor matching the given input parameters.

File Name :

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


package com.bethecoder.tutorials.commons_beanutils.common;



public class Student {



  private String name;

  private int age;

  private String hobby;



  public Student() {

  }



  public Student(String name, int age, String hobby) {

    super();

    this.name = name;

    this.age = age;

    this.hobby = hobby;

  }



  public String getName() {

    return name;

  }

  public void setName(String name) {

    this.name = name;

  }

  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 String toString() {

    return "Student[name = " + name + ", age = " + age + ", hobby = " + hobby + "]";

  }

}

File Name :	com/bethecoder/tutorials/commons_beanutils/GetConstructorTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.commons_beanutils;



import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationTargetException;



import org.apache.commons.beanutils.ConstructorUtils;



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



public class GetConstructorTest {



  /**

   * @param args

   * @throws InvocationTargetException 

   * @throws IllegalAccessException 

   * @throws InstantiationException 

   * @throws IllegalArgumentException 

   */

  public static void main(String[] args) throws IllegalArgumentException, 

    InstantiationException, IllegalAccessException, InvocationTargetException {

    

    Constructor<?> con = ConstructorUtils.getAccessibleConstructor(

        Student.class, new Class<?> [] {

          String.class, int.class, String.class

    });

    

    System.out.println(con);

    

    //Get a new instance from constructor

    Student student = (Student) con.newInstance("Sriram", 2, "Chess");

    System.out.println(student);

  }



}

Get Constructor