拿我这个分割XML的小栗子来说：
XMLInputFactory xif = XMLInputFactory.newInstance(); XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("input.xml")); // 用Stax读取XML xsr.nextTag(); // Advance to statements element TransformerFactory tf = TransformerFactory.newInstance(); Transformer t = tf.newTransformer(); t.setParameter(OutputKeys.OMIT_XML_DECLARATION, "no"); t.setParameter(OutputKeys.STANDALONE, "yes"); long i = 0; String action = null; while (xsr.hasNext()) { if (xsr.next() == XMLStreamConstants.START_ELEMENT) { if ("ContentItem".equals(xsr.getLocalName())) { action = getAttributeValue(xsr, "action"); } else if ("Data".equals(xsr.getLocalName())) { File file = new File("out/" + action + i++ + ".xml"); t.transform(new StAXSource(xsr), new StreamResult(file)); // 流式变换，走你~ // DOMResult dr = new DOMResult(); // 如果你要Dom格式的，releaseMe // t.transform(new StAXSource(xsr), dr); } } } |
知道最变态的是什么吗？需要解析XML整个内容到String里面，不单单是数据，就是整个XML标签和数据。其实就是ouputStream转String的过程：
ByteArrayOutputStream baos = new ByteArrayOutputStream(); t.transform(new StAXSource(xsr), new StreamResult(baos)); String subXMLStr = baos.toString(); |
好了，蟹八件和螃蟹都上齐了，可以开吃了。
