Question

如何从要在xstream中使用的XML Document或Node对象创建InputStream对象？我需要更换???用一些有意义的代码。感谢。

Document doc = getDocument();
InputStream is = ???;
MyObject obj = (MyObject) xstream.fromXML(is);

Answer 1

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());

Answer 2

如果您使用的是没有任何第三方库的Java，则可以使用以下代码创建InputStream：

/*
 * 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());
}

Answer 3

一种方法：使用Source将Document调整为DOMSource。创建StreamResult以适应ByteArrayOutputStream。使用Transformer中的TransformerFactory.newTransformer复制数据。检索您的byte[]并使用ByteArrayInputStream进行投放。

将代码放在一起留作练习。

Answer 4

 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());
 }

如果你使用的是apache Xerces实现，你也可以使用输出格式设置format参数。

Answer 5

public static InputStream documentToPrettyInputStream(Document document) throws IOException{

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    XMLWriter xmlWriter = new XMLWriter(outputStream, OutputFormat.createPrettyPrint());
    xmlWriter.write(document);
    xmlWriter.close();
    InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());

    return inputStream;

}

如果你碰巧使用DOM4j，你需要打印漂亮！

如何从文档或节点创建InputStream

5 个答案: