Java如何读取bean的属性值？
在这个例子中，我们将学习如何使用PropertyUtils.getSimpleProperty()方法读取bean的属性值。为了测试此方法，我们将为Trackbean创建一个简单的类。该Track班有一定的属性，如id，title和duration。
将PropertyUtils.getSimpleProperty()通过访问bean的getter方法读取我们的bean属性。该方法有两个参数。第一个参数是Bean，第二个参数是Bean的属性名称。java.lang.Object结果返回a，这意味着我们必须将其强制转换为所需的类型。
package org.nhooo.example.commons.beanutils;
import org.apache.commons.beanutils.PropertyUtils;
public class ReadBeanProperty {
public static void main(String[] args) {
Track track = new Track();
track.setTitle("Till There Was You");
try {
String title = (String) PropertyUtils.getSimpleProperty(track, "title");
System.out.println("Track title = " + title);
} catch (Exception e) {
e.printStackTrace();
}
}
}这是Track课程。
package org.nhooo.example.commons.beanutils;
public class Track {
private Long id;
private String title;
private Integer duration;
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;
}
@Override
public String toString() {
return "Track{" +
"id=" + id +
", title='" + title + '\'' +
", duration=" + duration +
'}';
}
}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>