apache BeanUtils的用法

1.对象person

public class Person
{
private long id;
private String name;
private List<Child> childs=new ArrayList<Child>();
private Date cyrzDate;
private Double age;
private Child child;
get{}
set{}
}

2.对象Child

public class Child
{
private long id;
private String name;
}

3.测试

public static void main(String[] args) throws Exception
{
SimpleDateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd");
Person personZhangsan=new Person();
personZhangsan.setName("zhansan");
Calendar calendar=Calendar.getInstance();
calendar.set(2014, 10, 16);
personZhangsan.setCyrzDate(calendar.getTime());
personZhangsan.setAge(20d);
personZhangsan.getChilds().add(new Child(10, "zhangsan_child10"));
personZhangsan.setChild(new Child(1, "child_zhangsan"));
Person personLisi=new Person();
personLisi.setName("lisi");
personLisi.setAge(40d);
personLisi.setName("wo jiao li si");
personLisi.setChild(new Child(1, "child_lisi"));
calendar.set(2015, 10, 16);
personLisi.setCyrzDate(calendar.getTime());
BeanUtils.copyProperties(personLisi, personZhangsan);
personZhangsan.setName("zhangsan2");
personZhangsan.setAge(10d);
personZhangsan.setCyrzDate(calendar.getTime());
personZhangsan.getChilds().add(new Child(11, "zhangsan_child11"));
personZhangsan.getChild().setName("child_zhangsan2");
//zhangsan2||child_zhangsan2||10.0||2015-11-16||2
System.out.println(personZhangsan.getName()+"||"+personZhangsan.getChild().getName()+"||"+personZhangsan.getAge()+"||"+dateFormat.format(personZhangsan.getCyrzDate())+"||"+personZhangsan.getChilds().size());
//zhansan||child_zhangsan2||20.0||2014-11-16||2
System.out.println(personLisi.getName()+"||"+personLisi.getChild().getName()+"||"+personLisi.getAge()+"||"+dateFormat.format(personLisi.getCyrzDate())+"||"+personLisi.getChilds().size());
personLisi.getChild().setName("child_lisi2"); //修改lisi孩子的名字影响zhangsan孩子的名字
//zhangsan2||child_lisi2||10.0||2015-11-16||2
System.out.println(personZhangsan.getName()+"||"+personZhangsan.getChild().getName()+"||"+personZhangsan.getAge()+"||"+dateFormat.format(personZhangsan.getCyrzDate())+"||"+personZhangsan.getChilds().size());
}

4.总结:

总结copy 基本数据类型和自定义数据类型都可以进行copy是真正的copye,注意:自定义数据类型并没有真正的进行实现coye,它们的内存地址还是同一个,修改任何一个都会影响其他