How do I read bean’s nested property value?

In this example you’ll see how to read bean’s nested property, we’ll use PropertyUtils.getNestedProperty() method. To test we will create three classes, Track and Artist for our beans and ReadNestedProperty as a main program to run.

The Track class will contain a property of an Artist object. Using the PropertyUtils.getNestedProperty() method we want to get the artist name that sing the track. This method will first read the artist property from the track object and then read the name property of the artist object.

Reading nested property using PropertyUtils.getNestedProperty() it can read nested level in no limit.

package org.kodejava.example.commons.beanutils;

import org.apache.commons.beanutils.PropertyUtils;

public class ReadNestedProperty {
    public static void main(String[] args) {
        Track track = new Track();
        track.setId(1L);
        track.setTitle("All My Loving");
        track.setArtist(new Artist(1L, "Beatles"));

        try {
            String artistName = (String) PropertyUtils.getNestedProperty(track, "artist.name");
            System.out.println("Artist Name = " + artistName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
package org.kodejava.example.commons.beanutils;

public class Track {
    private Long id;
    private String title;
    private Integer duration;
    private Artist artist;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Integer getDuration() {
        return duration;
    }

    public void setDuration(Integer duration) {
        this.duration = duration;
    }

    public Artist getArtist() {
        return artist;
    }

    public void setArtist(Artist artist) {
        this.artist = artist;
    }

    @Override
    public String toString() {
        return "Track{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", duration=" + duration +
                '}';
    }
}
package org.kodejava.example.commons.beanutils;

public class Artist {
    private Long id;
    private String name;

    public Artist() {
    }

    public Artist(Long id, String name) {
        this.id = id;
        this.name = name;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Wayan

Programmer, runner, recreational diver, live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. Support me by donating.

Leave a Reply