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我们使用SAX来解析XML,因为它不需要将整个XML文档读入内存以解析单个值。我阅读了许多文章,强调SAX只能用于解析/解码XML,而不能创建它。这是真的?如何使用Java 1.4和SAX将任意数据编码为XML?
我们使用SAX来解析XML,因为它不需要将整个XML文档读入内存以解析单个值。我阅读了许多文章,强调SAX只能用于解析/解码XML,而不能创建它。这是真的?如何使用Java 1.4和SAX将任意数据编码为XML?
不,这不是真的,你可以使用类似的东西编码XML在Java中任何作家:
char[] ch;
AttributesImpl atts = new AttributesImpl();
Writer writer = new StringWriter();
StreamResult streamResult = new StreamResult(writer);
SAXTransformerFactory tf = (SAXTransformerFactory) TransformerFactory.newInstance();
// SAX2.0 ContentHandler
TransformerHandler transformerHandler = tf.newTransformerHandler();
Transformer serializer = transformerHandler.getTransformer();
serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
// serializer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "nodes.dtd");
serializer.setOutputProperty(OutputKeys.INDENT, "yes");
transformerHandler.setResult(streamResult);
transformerHandler.startDocument();
atts.clear();
// atts.addAttribute("", "", "xmlns", "CDATA", "http://www.example.com/nodes");
// atts.addAttribute("", "", "xmlns:xsi", "CDATA", "http://www.w3.org/2001/XMLSchema-instance");
// atts.addAttribute("", "", "xsi:schemaLocation", "CDATA", "/nodes.xsd");
transformerHandler.startElement("", "", "node_list", atts);
// displayName element
if (displayName != null) {
transformerHandler.startElement("", "", "display_name", null);
ch = displayName.toCharArray();
transformerHandler.characters(ch, 0, ch.length);
transformerHandler.endElement("", "", "display_name");
}
// nodes element
transformerHandler.startElement("", "", "nodes", null);
atts.clear();
atts.addAttribute("", "", "node_type", "CDATA", "sometype");
transformerHandler.startElement("", "", "node", atts);
ch = node.getValue().toCharArray();
transformerHandler.startElement("", "", "value", null);
transformerHandler.characters(ch, 0, ch.length);
transformerHandler.endElement("", "", "value");
transformerHandler.endElement("", "", "node");
transformerHandler.endElement("", "", "nodes");
transformerHandler.endElement("", "", "node_list");
transformerHandler.endDocument();
String xml = writer.toString();
的SAX处理程序接口被设计为容易实现。编写一个类似的类(可能包装一个SAX接口)很容易,以便于调用链接,记住要关闭哪个元素,更简单的属性等。
这是否会在内存中建立整个文档?使用XSLT处理器? – 2009-12-29 22:39:08