通过复制二进制流对java对象进行深度克隆

JavaBean深克隆实现

最新推荐文章于 2024-07-23 18:16:41 发布

原创最新推荐文章于 2024-07-23 18:16:41 发布 · 325 阅读

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本文介绍了一种使用JavaBeans XMLEncoder和XMLDecoder实现JavaBean深克隆的方法。通过将对象序列化为XML字节流再反序列化，可以得到原始对象的一个独立副本。

http://www.mail-archive.com/commons-dev@jakarta.apache.org/msg43687.html

I see BeanUtils (package org.apache.commons.beanutils) currently has a
cloneBean utility method to do shallow bean cloning.  Sometimes it is useful
to do a deep clone.  Please find below a simple implementation.  Can similar
method be incorporated/provided in BeanUtils ?

Hanson

import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.beans.XMLEncoder;
import java.beans.XMLDecoder;

/**
 * Used to clone java beans.
 */
public class JavaBeanCopier {
    /**
     *  Returns a deeply cloned java bean.
     *
     * @param fromBean java bean to be cloned.
     * @return a new java bean cloned from fromBean.
     */
    public static Object copy(Object fromBean) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        XMLEncoder out = new XMLEncoder(bos);
        out.writeObject(fromBean);
        out.close();
        ByteArrayInputStream bis = new
ByteArrayInputStream(bos.toByteArray());
        XMLDecoder in = new XMLDecoder(bis);
        Object toBean = in.readObject();
        in.close();
        return toBean;
    }
}