克隆dom.Document对象 [英] Cloning dom.Document object

问题描述

我的目的是将xml文件读入Dom对象，编辑dom对象，这涉及删除一些节点。

My purpose is to read xml file into Dom object, edit the dom object, which involves removing some nodes.

完成之后，我希望将Dom恢复到原始状态，而无需实际解析XML文件。

After this is done i wish to restore the Dom to its original state without actually parsing the XML file.

无论如何，我可以克隆第一次解析xml文件后获得的dom对象。这个想法是避免一直读取和解析xml，只需保留原始的dom树的副本。

Is there anyway i can clone the dom object i obtained after parsing the xml file for the first time. the idea is to avoid reading and parsing xml all the time, just keep a copy of original dom tree.

推荐答案

你可以使用 importNode org.w3c.dom.Document上的API：

You could use importNode API on org.w3c.dom.Document:

Node copy = document.importNode(node, true);

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完整示例

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

public class Demo {

    public static void main(String[] args) throws Exception {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();

        Document originalDocument = db.parse(new File("input.xml"));
        Node originalRoot = originalDocument.getDocumentElement();

        Document copiedDocument = db.newDocument();
        Node copiedRoot = copiedDocument.importNode(originalRoot, true);
        copiedDocument.appendChild(copiedRoot);

    }
}

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