DOM 方式生成 XML 文档
import java.io.File;
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.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class CreateXML {
public DocumentBuilder getDocumentBuilder() {
// 创建一个DocumentBuilderFactory的对象
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
// 创建DocumentBuilder对象
DocumentBuilder db = null;
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException e) {
e.printStackTrace();
}
return db;
}
/**
* 生成xml
*/
public void createXML() {
DocumentBuilder db = getDocumentBuilder();
Document document = db.newDocument();
document.setXmlStandalone(true); // 不显示standalone
Element bookstore = document.createElement("bookStore");
// 向bookstore根节点中添加子节点book
Element book = document.createElement("book");
Element name = document.createElement("name");
// name.setNodeValue("小王子"); // 行不通
name.setTextContent("小王子");
book.appendChild(name);
book.setAttribute("id", "1");
// 将book节点添加到bookstore根节点中
bookstore.appendChild(book);
// 将bookstore节点（已经包含了book）添加到dom树中
document.appendChild(bookstore);
// 创建TransformerFactory对象
TransformerFactory tff = TransformerFactory.newInstance();
try {
// 创建Transformer对象
Transformer tf = tff.newTransformer();
tf.setOutputProperty(OutputKeys.INDENT, "yes");
tf.transform(new DOMSource(document), new StreamResult(new File("books1.xml")));
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
CreateXML creatXml = new CreateXML();
creatXml.createXML();
}
}
通过 SAX 方式生成 XML 文档
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import com.xmlparsing.imooc.entity.Book;
public class SAXTestCreate {
public void createXML() {
Book b1 = new Book();
b1.setId("1");
b1.setName("冰与火之歌");
b1.setAuthor("乔治马丁");
b1.setYear("2014");
b1.setPrice("89");
Book b2 = new Book();
b2.setId("2");
b2.setName("安徒生童话");
b2.setAuthor("乔治马丁");
b2.setYear("2004");
b2.setPrice("77");
b2.setLanguage("English");
ArrayList<Book> bookList = new ArrayList<Book>();
bookList.add(b1);
bookList.add(b2);
// 生成xml
// 1.创建一个TransformerFactory类的对象
SAXTransformerFactory tff = (SAXTransformerFactory) SAXTransformerFactory
.newInstance();
try {
// 2.通过SAXTransformerFactory对象创建一个TransformerHandler对象
TransformerHandler handler = tff.newTransformerHandler();
/*
// 3.通过handler对象创建一个Transformer对象，必须在第6步handler.setResult(result);之前写才会生效
Transformer tr = handler.getTransformer();
// 4.通过Transformer对象对生成的xml文件进行设置
// 设置xml的编码
tr.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); // 设置编码
// 设置xml的“是否换行”
tr.setOutputProperty(OutputKeys.INDENT, "yes"); // 设置节点换行
*/
// 5.创建一个Result对象
File f = new File("newbooks.xml");
if (!f.exists()) { // 不存在则创建
f.createNewFile();
}
// 6.创建Result对象，并且使其与handler关联
Result result = new StreamResult(new FileOutputStream(f));
handler.setResult(result);
// 7.利用handler对象进行xml文件内容的编写
// 打开document
handler.startDocument();
AttributesImpl attr = new AttributesImpl();
handler.startElement("", "", "bookstore", attr);
for (Book book : bookList) {
attr.clear();
attr.addAttribute("", "", "id", "", book.getId());
handler.startElement("", "", "book", attr);
// 创建name节点
if (book.getName() != null && !book.getName().trim().equals("")) {
attr.clear();
handler.startElement("", "", "name", attr);
handler.characters(book.getName().toCharArray(), 0, book
.getName().length());
handler.endElement("", "", "name");
}
// 创建year节点
if (book.getYear() != null && !book.getYear().trim().equals("")) {
attr.clear();
handler.startElement("", "", "year", attr);
handler.characters(book.getYear().toCharArray(), 0, book
.getYear().length());
handler.endElement("", "", "year");
}
// 创建author节点
if (book.getAuthor() != null && !book.getAuthor().trim().equals("")) {
attr.clear();
handler.startElement("", "", "author", attr);
handler.characters(book.getAuthor().toCharArray(), 0, book
.getAuthor().length());
handler.endElement("", "", "author");
}
// 创建price节点
if (book.getPrice() != null && !book.getPrice().trim().equals("")) {
attr.clear();
handler.startElement("", "", "price", attr);
handler.characters(book.getPrice().toCharArray(), 0, book
.getPrice().length());
handler.endElement("", "", "price");
}
// 创建language节点
if (book.getLanguage() != null && !book.getLanguage().trim().equals("")) {
attr.clear();
handler.startElement("", "", "language", attr);
handler.characters(book.getLanguage().toCharArray(), 0, book
.getLanguage().length());
handler.endElement("", "", "language");
}
handler.endElement("", "", "book");
}
handler.endElement("", "", "bookstore");
// 关闭document
handler.endDocument();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
SAXTestCreate test = new SAXTestCreate();
test.createXML();
}
}
通过 DOM4J 方式生成 XML 文档
生成RSS文件格式的xml文件
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
public class DOM4JTestCreate {
private void createXML() {
// 1.创建document对象，代表整个xml文档
Document document = DocumentHelper.createDocument();
// 2.创建根节点rss
Element rss = document.addElement("rss");
// 3.向rss节点中添加version属性
rss.addAttribute("version", "2.0");
// 4.生成子节点及节点内容
Element channel = rss.addElement("channel");
Element title = channel.addElement("title");
title.setText("<![CDATA[上海移动互联网产业促进中心正式揭牌 ]]>");
// 5.设置生成xml的格式
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK");
// 6.生成xml文件
File file = new File("rssnews.xml");
XMLWriter writer;
try {
writer = new XMLWriter(new FileOutputStream(file), format);
// 设置是否转义，默认值是true，代表转义
writer.setEscapeText(false);
writer.write(document);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @param args
*/
public static void main(String[] args) {
new DOM4JTestCreate().createXML();
}
}
通过 JDOM 方式生成 XML 文档
package com.xmlparsing.imooc.write.jdom;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
public class JDOMTestCreate {
private void createXML() {
// 1.生成一个根节点
Element rss = new Element("rss");
// 2.为节点添加属性
rss.setAttribute("version", "2.0");
// 3.生成一个document对象
Document document = new Document(rss);
Element channel = new Element("channel");
rss.addContent(channel);
Element title = new Element("title");
title.setText("<![CDATA[上海移动互联网产业促进中心正式揭牌 ]]>");
/*
// 解决xml转义的问题
CDATA cdata = new CDATA("<上海移动互联网产业促进中心正式揭牌>");
title.addContent(cdata);
*/
channel.addContent(title);
Format format = Format.getCompactFormat();
format.setIndent("");
format.setEncoding("GBK");
// 4.创建XMLOutputter的对象
XMLOutputter outputer = new XMLOutputter(format);
try {
// 5.利用outputer将document对象转换成xml文档
outputer.output(document, new FileOutputStream(new File("rssnews.xml")));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
JDOMTestCreate creater = new JDOMTestCreate();
creater.createXML();
}
}
不同生成方法大PK
- DOM基于Tree
- SAX基于事件
- JDOM、DOM4J基于底层API
DOM生成的DOM树会驻留在内存中，方便后期改动，删除、修改、重新排列
SAX不能在写的过程中回头修改
