将Document对象转换为Byte []

Question

我是这样的init对象:

DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.newDocument();

之后,我通过将数据插入doc对象来构建XML文件.

最后,我将内容写入计算机上的文件.

我的问题是如何将doc的内容写入byte[]？*

这就是我将内容写入XML文件的方式:

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File("changeOut.xml"));
// Output to console for testing
// StreamResult result = new StreamResult(System.out);
transformer.transform(source, result);

Answer 1

将OutputStream而不是File传递给StreamResult构造函数.

 ByteArrayOutputStream bos=new ByteArrayOutputStream();
 StreamResult result=new StreamResult(bos);
 transformer.transform(source, result);
 byte []array=bos.toByteArray();

Answer 2

这项工作对我来说:

public byte[] documentToByte(Document document)
{
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    org.apache.xml.security.utils.XMLUtils.outputDOM(document, baos, true);
    return baos.toByteArray();
}