Java 如何从文档或节点创建 InputStream
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原文地址: http://stackoverflow.com/questions/865039/
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how to create an InputStream from a Document or Node
提问by Mike Pone
How can I create an InputStream object from a XML Document or Node object to be used in xstream? I need to replace the ??? with some meaningful code. Thanks.
如何从要在 xstream 中使用的 XML 文档或节点对象创建 InputStream 对象？我需要更换？？？带有一些有意义的代码。谢谢。
Document doc = getDocument();
InputStream is = ???;
MyObject obj = (MyObject) xstream.fromXML(is);
采纳答案by Gary Kephart
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Source xmlSource = new DOMSource(doc);
Result outputTarget = new StreamResult(outputStream);
TransformerFactory.newInstance().newTransformer().transform(xmlSource, outputTarget);
InputStream is = new ByteArrayInputStream(outputStream.toByteArray());
回答by Tom Hawtin - tackline
One way to do it: Adapt the Documentto a Sourcewith DOMSource. Create a StreamResultto adapt a ByteArrayOutputStream. Use a Transformerfrom TransformerFactory.newTransformerto copy across the data. Retrieve your byte[]and stream with ByteArrayInputStream.
一种方式做到这一点：适应Document于源与DOMSource的。创建一个StreamResult以适应ByteArrayOutputStream。使用TransformerFactory.newTransformer 中的Transformer复制数据。byte[]使用ByteArrayInputStream检索您的和流。
Putting the code together is left as an exercise.
将代码放在一起作为练习。
回答by Gary Kephart
If you are using Java without any Third Party Libraries, you can create InputStreamusing below code:
如果您在没有任何第三方库的情况下使用 Java，则可以InputStream使用以下代码创建：
/*
* Convert a w3c dom node to a InputStream
*/
private InputStream nodeToInputStream(Node node) throws TransformerException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Result outputTarget = new StreamResult(outputStream);
Transformer t = TransformerFactory.newInstance().newTransformer();
t.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
t.transform(new DOMSource(node), outputTarget);
return new ByteArrayInputStream(outputStream.toByteArray());
}
回答by Giordano Maestro
public static InputStream document2InputStream(Document document) throws IOException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
OutputFormat outputFormat = new OutputFormat(document);
XMLSerializer serializer = new XMLSerializer(outputStream, outputFormat);
serializer.serialize(document);
return new ByteArrayInputStream(outputStream.toByteArray());
}
This works if you are using apache Xerces implementation, you can also set format parameter with the output format.
如果您使用的是 apache Xerces 实现，这有效，您还可以使用输出格式设置格式参数。
回答by NikolayKostadinov
public static InputStream documentToPrettyInputStream(Document doc) throws IOException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
XMLWriter xmlWriter = new XMLWriter(outputStream, OutputFormat.createPrettyPrint());
xmlWriter.write(doc);
xmlWriter.close();
InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
return inputStream;
}
If you happen to use DOM4j and you need to print it pretty!
如果您碰巧使用 DOM4j 并且需要漂亮地打印它！
