DOM、SAX、DOM4J、JDOM、StAX生成XML并回来XML字符串形式(转自http://dreams75.iteye.com/blog/512319)
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 Result
transformer.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 Result
TransformerHandler 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);
}
}