Java如何读取索引bean的属性值？
在此示例中，您将看到如何读取诸如List或的对象的索引属性array。使用该PropertyUtils.getIndexedProperty()方法，我们可以轻松做到。此方法使用bean和包含要读取的元素的索引属性的名称。让我们看下面的示例以获取更多详细信息。
package org.nhooo.example.commons.beanutils;
import org.apache.commons.beanutils.PropertyUtils;
import java.util.ArrayList;
import java.util.List;
public class ReadIndexedProperty {
public static void main(String[] args) {
Recording recording = new Recording();
recording.setId(1L);
recording.setTitle("With The Beatles");
List<Track> tracks = new ArrayList<>();
Track track1 = new Track();
track1.setTitle("It Won't Be Long");
Track track2 = new Track();
track2.setTitle("All I've Got To Do");
Track track3 = new Track();
track3.setTitle("All My Loving");
tracks.add(track1);
tracks.add(track2);
tracks.add(track3);
recording.setTracks(tracks);
try {
Track trackOne = (Track) PropertyUtils.getIndexedProperty(recording, "tracks[0]");
Track trackThree = (Track) PropertyUtils.getIndexedProperty(recording, "tracks[2]");
System.out.println("trackOne.getTitle() = " + trackOne.getTitle());
System.out.println("trackThree.getTitle() = " + trackThree.getTitle());
} catch (Exception e) {
e.printStackTrace();
}
}
}package org.nhooo.example.commons.beanutils;
import java.util.ArrayList;
import java.util.List;
public class Recording {
private Long id;
private String title;
private List<Track> tracks = new ArrayList<>();
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 List getTracks() {
return tracks;
}
public void setTracks(List<Track> tracks) {
this.tracks = tracks;
}
}我们的计划结果是：
trackOne.getTitle() = It Won't Be Long trackThree.getTitle() = All My Loving
Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=commons-beanutils/commons-beanutils/1.9.3/commons-beanutils-1.9.3.jar -->
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.3</version>
</dependency>