DOM、SAX、DOM4J、JDOM、StAX生成XML并返回XML字符串形式(转自http://dreams75.iteye.com/blog/512319)
import java.io.BufferedWriter;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.io.StringWriter;import java.io.UnsupportedEncodingException;import java.util.List;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import javax.xml.stream.XMLEventReader;import javax.xml.stream.XMLOutputFactory;import javax.xml.stream.XMLStreamException;import javax.xml.stream.XMLStreamWriter;import javax.xml.transform.OutputKeys;import javax.xml.transform.Result;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.sax.SAXTransformerFactory;import javax.xml.transform.sax.TransformerHandler;import javax.xml.transform.stax.StAXSource;import javax.xml.transform.stream.StreamResult;import org.dom4j.DocumentFactory;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;import org.jdom.Document;import org.jdom.Element;import org.jdom.output.XMLOutputter;import org.w3c.dom.Node;import org.w3c.dom.Text;import org.xml.sax.SAXException;import org.xml.sax.helpers.AttributesImpl;/** * DOM、SAX、DOM4J、JDOM、StAX生成XML，返回各种方式生成XML的字符串形式 * <p> * <cities><city><id>151</id><name>长沙市</name></city><city><id>152</id><name>永州市</name></city></cities> * </p> * @author fzbtshy@163.com * */public class CreateXMLText {/** * DOM方式生成XML * @param cityList * @return */public String domToXml(List<City> list) {String xmlStr = null;try {if (null != list && !list.isEmpty()) {// 实例化DOM生成工厂DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();// 由工厂实例化文档创建器DocumentBuilder db = dbf.newDocumentBuilder();// 由文档创建器实例化文档对象org.w3c.dom.Document doc = db.newDocument();// 文档对象创建一个根元素<cities>org.w3c.dom.Element cities = doc.createElement("cities");doc.appendChild(cities);for (City po : list) {// 创建<cities>的子元素<city>org.w3c.dom.Element cityElt = doc.createElement("city");cities.appendChild(cityElt);// 创建<city>的子元素<id>org.w3c.dom.Element idElt = doc.createElement("id");cityElt.appendChild(idElt);// 创建子元素<id>的文本值// 第一种方式// Text idTxt = doc.createTextNode(String.valueOf(c.getId()));// idElt.appendChild(idTxt);// 第二种方式idElt.setTextContent(String.valueOf(po.getId()));// 创建<city>的子元素<name>org.w3c.dom.Element nameElt = doc.createElement("name");cityElt.appendChild(nameElt);// 创建子元素<name>的文本值Text nameTxt = doc.createTextNode(po.getName());nameElt.appendChild(nameTxt);//nameElt.setTextContent(po.getName());}xmlStr = getDomXml(doc);}} catch (ParserConfigurationException e) {e.printStackTrace();}System.out.println("DOM:" + xmlStr);return xmlStr;}/** * 将org.w3c.dom.Document内容转化成String * * @param doc * @return */private String getDomXml(Node doc) {String xmlStr = null;try {// 以 Document Object Model（DOM）树的形式充当转换 Source 树的持有者DOMSource source = new DOMSource(doc);//用来生成XML文件 // 要生成文件需构造PrintWriter的writer,//DOM中这种方式name的值没有写进去,由于编码的问题//PrintWriter writerXml = new PrintWriter(new FileOutputStream("city-dom.xml"));//用OutputStreamWriter加了编码就OK了PrintWriter writerXml = new PrintWriter(new OutputStreamWriter(new FileOutputStream("city-jdom.xml"),"utf-8"));Result resultXml = new StreamResult(writerXml);// 实现此接口的对象包含构建转换结果树所需的信息//Result resultXml = new StreamResult(new FileOutputStream("city-dom.xml"));//用来得到XML字符串形式// 一个字符流，可以用其回收在字符串缓冲区中的输出来构造字符串。StringWriter writerStr = new StringWriter();Result resultStr = new StreamResult(writerStr);// 此抽象类的实例能够将源树转换为结果树。Transformer transformer = TransformerFactory.newInstance().newTransformer();// 设置编码transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");// 是否缩进transformer.setOutputProperty(OutputKeys.INDENT, "yes");// 将 XML Source 转换为 Resulttransformer.transform(source, resultXml);transformer.transform(source, resultStr);//获取XML字符串xmlStr = writerStr.getBuffer().toString();} catch (TransformerException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}return xmlStr;}/** * SAX方式生成XML * * @param list * @return */public String saxToXml(List<City> list) {String xmlStr = null;try {//用来生成XML文件// 要生成文件需构造PrintWriter的writer//PrintWriter writerXml = new PrintWriter("city-sax.xml");//Result resultXml = new StreamResult(writerXml);// 实现此接口的对象包含构建转换结果树所需的信息Result resultXml = new StreamResult(new FileOutputStream("city-sax.xml"));//用来得到XML字符串形式// 一个字符流，可以用其回收在字符串缓冲区中的输出来构造字符串StringWriter writerStr = new StringWriter();// 构建转换结果树所需的信息。Result resultStr = new StreamResult(writerStr);// 创建SAX转换工厂SAXTransformerFactory sff = (SAXTransformerFactory) SAXTransformerFactory.newInstance();// 转换处理器，侦听 SAX ContentHandler //解析事件，并将它们转换为结果树 ResultTransformerHandler th = sff.newTransformerHandler();// 将源树转换为结果树Transformer transformer = th.getTransformer();// 设置字符编码transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");// 是否缩进 transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //设置与用于转换的此 TransformerHandler 关联的 Result //注：这两个th.setResult不能同时启用//th.setResult(resultXml); th.setResult(resultStr);th.startDocument();AttributesImpl attr = new AttributesImpl();th.startElement("", "", "cities", attr);if (null != list && !list.isEmpty()) {for (int i = 0; i < list.size(); i++) {th.startElement("", "", "city", attr);th.startElement("", "", "id", attr);String id = String.valueOf(list.get(i).getId());th.characters(id.toCharArray(), 0, id.length());th.endElement("", "", "id");th.startElement("", "", "name", attr);String name = String.valueOf(list.get(i).getName());th.characters(name.toCharArray(), 0, name.length());th.endElement("", "", "name");th.endElement("", "", "city");}}th.endElement("", "", "cities");th.endDocument();xmlStr = writerStr.getBuffer().toString();} catch (TransformerConfigurationException e) {e.printStackTrace();} catch (SAXException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}System.out.println("SAX:" + xmlStr);return xmlStr;}/** * StAX生成XML，它是The Streaming API for XML简称 * JDK1.6的新增 * @param list * @return */public String stAXToXml( List<City> list ){String xmlStr = null;try {if (null != list && !list.isEmpty()) {StringWriter writerStr = new StringWriter();PrintWriter writerXml = new PrintWriter(new OutputStreamWriter(new FileOutputStream("city-StAX.xml"),"utf-8"));//定义用于获取 XMLEventWriter 和 XMLStreamWriter 的工厂抽象实现XMLOutputFactory xof = XMLOutputFactory.newInstance();//指定如何写XML，注：以下两行只能启用一行//XMLStreamWriter xmlsw = xof.createXMLStreamWriter(writerStr);XMLStreamWriter xmlsw = xof.createXMLStreamWriter(writerXml);//写入XML文档声明xmlsw.writeStartDocument("UTF-8", "1.0");xmlsw.writeStartElement("cities");// 写入注释到xml文档xmlsw.writeComment("省和城市信息");for (City po : list) {xmlsw.writeStartElement("city");//添加<id>节点xmlsw.writeStartElement("id");xmlsw.writeCharacters(String.valueOf(po.getId()));// 结束<id>节点xmlsw.writeEndElement();//添加<name>节点xmlsw.writeStartElement("name");xmlsw.writeCharacters(po.getName());// 结束<name>节点xmlsw.writeEndElement();xmlsw.writeEndElement();}// 结束<cities>节点xmlsw.writeEndElement();// 结束 XML 文档xmlsw.writeEndDocument();xmlsw.flush();xmlsw.close();xmlStr = writerStr.getBuffer().toString();writerStr.close();}} catch (XMLStreamException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}System.out.println("StAX:" + xmlStr );return xmlStr;}/** * JDOM方式生成XML * * @param list * @return */public String jdomToXml(List<City> list) {String xmlStr = null;try {// 创建文档根节点<cities>Element citiesElt = new Element("cities");if (null != list && !list.isEmpty()) {for (City po : list) {// 创建子元素节点<city>Element cityElt = new Element("city");// 创建子元素节点<id>Element idElt = new Element("id");// 向元素<city>中添加子元素<id>cityElt.addContent(idElt);// 添加id文本idElt.addContent(String.valueOf(po.getId()));// 创建元素节点<name>Element nameElt = new Element("name");// 向元素<city>中添加子元素<name>cityElt.addContent(nameElt);// 添加name文本nameElt.addContent(po.getName());// 在文档根节点添加子节点<city>citiesElt.addContent(cityElt);}}Document doc = new Document(citiesElt);XMLOutputter out = new XMLOutputter();//获得XML字符串形式xmlStr = out.outputString(doc);//生成XML文件PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream("city-jdom.xml"),"utf-8"));out.output(doc, writer);writer.flush();writer.close();} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}System.out.println("JDOM:" + xmlStr);return xmlStr;}/** * DOM4J生成XML * * @param list * @return */public String dom4jToXml(List<City> list) {String strXml = null;try {if (null != list && !list.isEmpty()) {DocumentFactory df = DocumentFactory.getInstance();// org.dom4j.Document doc = DocumentHelper.createDocument();org.dom4j.Document doc = df.createDocument("UTF-8");// 创建根节点org.dom4j.Element citiesElt = doc.addElement("cities");for (City po : list) {// 在节点<cities>下增加子节点<city>org.dom4j.Element cityElt = citiesElt.addElement("city");// 在节点<city>下增加子节点<id>org.dom4j.Element idElt = cityElt.addElement("id");idElt.addText(String.valueOf(po.getId()));// 在节点<city>下增加子节点<name>org.dom4j.Element nameElt = cityElt.addElement("name");nameElt.addText(po.getName());}// 有样式(缩进)的写出OutputFormat opf = OutputFormat.createPrettyPrint();opf.setEncoding("UTF-8");opf.setTrimText(true);//生成XML文件XMLWriter xmlOut = new XMLWriter(new FileOutputStream("city-dom4j.xml"), opf);xmlOut.write(doc);xmlOut.flush();xmlOut.close();//获取XML字符串形式StringWriter writerStr = new StringWriter();XMLWriter xmlw = new XMLWriter(writerStr, opf);xmlw.write(doc);strXml = writerStr.getBuffer().toString();// 无样式的//strXml = doc.asXML();}} catch (IOException e) {e.printStackTrace();}System.out.println("DOM4J:" + strXml);return strXml;}public static void main(String[] args) throws Exception {List<City> list = City.getCityList(101L);CreateXMLText xml = new CreateXMLText();xml.domToXml(list);xml.saxToXml(list);xml.stAXToXml(list);xml.dom4jToXml(list);xml.jdomToXml(list);}}?