Java如何设置bean的映射属性值？
本示例演示如何使用PropertyUtils.setMappedProperty()方法修改Mapbean的类型化属性值。要设置属性，我们需要将bean实例，属性名称，映射键和映射值传递给PropertyUtils.setMappedProperty()方法。
package org.nhooo.example.commons.beanutils;
import org.apache.commons.beanutils.PropertyUtils;
import java.util.HashMap;
import java.util.Map;
public class PropertySetMappedExample {
public static void main(String[] args) {
//创建Recordingbean的实例。
Recording recording = new Recording();
recording.setId(1L);
recording.setTitle("Introduction");
//创建映射以保存记录轨道。
Map<String, Track> tracks = new HashMap<>();
tracks.put("track-one", new Track());
tracks.put("track-two", new Track());
tracks.put("track-three", new Track());
recording.setMapTracks(tracks);
try {
//我们使用添加另一个轨道到录音轨道
//一个PropertyUtils.setMappedProperty()方法。
PropertyUtils.setMappedProperty(recording, "mapTracks", "track-four", new Track());
PropertyUtils.setMappedProperty(recording, "mapTracks", "track-five", new Track());
} catch (Exception e) {
e.printStackTrace();
}
tracks = recording.getMapTracks();
System.out.println("New Track Numbers: " + tracks.size());
for (String key : tracks.keySet()) {
System.out.println(key + " = " + tracks.get(key));
}
}
}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>