把xml格式的字符串写入到一个xml文件中
package demo; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.StringReader; import java.util.Date; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.xml.sax.InputSource; import org.xml.sax.SAXException; public class DocXml { public static void main(String[] args) { String s1 = "<?xml version=\"1.0\" encoding=\"utf-8\"?><img src=\"http://b0.upaiyun.com/1523978382096.jpg\"><h1>百度</h1></img>"; Document doc = str2Document(s1); String fileName = "E:\\learn\\a.html"; createXml(fileName, doc); } public static Document str2Document(String xmlStr) { Document doc = null; StringReader sr = new StringReader(xmlStr); InputSource is = new InputSource(sr); DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = factory.newDocumentBuilder(); doc = builder.parse(is); } catch (ParserConfigurationException e) { System.out.println("ParserConfiguration错误"+e); } catch (SAXException e) { System.out.println("SAX错误"+e); } catch (IOException e) { System.out.println("IO错误"+e); } return doc; } public synchronized static void createXml(String fileName, Document document) { System.out.println("============进入生成xml方法:" + new Date().toLocaleString() + "================="); try { // 判断文件是否存在,如存在就删掉它 File file = new File(fileName); if (file.exists()) { file.delete(); System.out.println("==============删除xml文件=============="); } /** 将document中的内容写入文件中 */ TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(); transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); DOMSource source = new DOMSource(document); StreamResult result = new StreamResult(new FileOutputStream(fileName)); transformer.transform(source, result); System.out.println("--------------------------------" + "更新 XML文件成功" + "-------------------------------------"); } catch (final Exception exception) { System.out.println("更新" + fileName + "出错:"+exception); } System.out.println("============退出生成xml方法:" + new Date().toLocaleString() + "================="); } }