Java如何读取映射bean的属性值？
在此示例中，您将看到如何读取Bean的映射属性值。我们使用PropertyUtils.getMappedProperty()方法读取Recording由Track对象组成的对象的映射属性。
package org.nhooo.example.commons.beanutils;
import org.apache.commons.beanutils.PropertyUtils;
import java.util.HashMap;
import java.util.Map;
public class ReadMapProperty {
public static void main(String[] args) {
Recording recording = new Recording();
recording.setTitle("Please Please Me");
Track track1 = new Track();
track1.setTitle("I Saw Her Standing There");
Track track2 = new Track();
track2.setTitle("Misery");
Map<String, Track> tracks = new HashMap<>();
tracks.put("Track One", track1);
tracks.put("Track Two", track2);
recording.setMapTracks(tracks);
try {
Track track = (Track) PropertyUtils.getMappedProperty(recording, "mapTracks(Track One)");
System.out.println("track.getTitle() = " + track.getTitle());
} catch (Exception e) {
e.printStackTrace();
}
}
}package org.nhooo.example.commons.beanutils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Recording {
private Long id;
private String title;
private List<Track> tracks = new ArrayList<>();
private Map<String, Track> mapTracks = new HashMap<>();
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<Track> getTracks() {
return tracks;
}
public void setTracks(List<Track> tracks) {
this.tracks = tracks;
}
public void setMapTracks(Map<String, Track> mapTracks) {
this.mapTracks = mapTracks;
}
public Map<String, Track> getMapTracks() {
return mapTracks;
}
}这是我们程序的结果。
track.getTitle() = I Saw Her Standing There
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>