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.