Spring中BeanUtils的用法

转自：http://hi.baidu.com/webidea/blog/item/d269a9d313bbf3dca8ec9a28.html

Spring中的BeanUtils类为java中的JavaBean类提供了一此常用的静态方法.通过这些方法可以方便地使用在Web应用程序中.如在对象与对象之间属性的复制工作.

上面介绍的为BeanUtils类提供的属性复制功能:

public class BeanUtilsDemo {

private String firstName;

private String lastName;

protected static Log log = LogFactory.getLog(BeanUtilsDemo.class);

public BeanUtilsDemo() {

}

public BeanUtilsDemo(String firstName, String lastName) {

super();

this.firstName = firstName;

this.lastName = lastName;

}

public static void main(String args[]) {

BeanUtilsDemo bean1 = new BeanUtilsDemo("谷", "键");

BeanUtilsDemo bean2 = new BeanUtilsDemo("陈", "澣");

log.info(bean1.toString());

log.info(bean2.toString());

BeanUtils.copyProperties(bean1, bean2);

log.info(bean1.toString());

log.info(bean2.toString());

//下面几行为通过instantiateClass方法的构造器来创建对象

Constructor cons;

Class className = Class

.forName("com.inqgen.spring.beanutils.BeanUtilsDemo");

cons = className.getConstructor(String.class, String.class);

BeanUtilsDemo bean3 = (BeanUtilsDemo) BeanUtils.instantiateClass(

cons, new Object[] { "张", "黄莺" });

log.info(bean3);

}

public String getFirstName() {

return firstName;

}

public void setFirstName(String firstName) {

this.firstName = firstName;

}

public String getLastName() {

return lastName;

}

public void setLastName(String lastName) {

this.lastName = lastName;

}

public String toString() {

return "[" + getFirstName() + "," + getLastName()+ "]";

}

最后在console中的结果为:

[谷,键],[陈,澣],[谷,键],[谷,键]

beans:将输出为:[张,黄莺]

从结果中可以看到原对象bean1中的属性值被复工制到了bean2中.