生成XMl文件的四种方式
一、Dom写入
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
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.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class DomXml {
@Test
public void test(){
Long start = System.currentTimeMillis();
createXml();
System.out.println("运行时间："+ (System.currentTimeMillis() - start));
}
/**
* 生成xml方法
*/
public static void createXml(){
try {
// 创建解析器工厂
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder db = factory.newDocumentBuilder();
Document document = db.newDocument();
// 不显示standalone="no"
document.setXmlStandalone(true);
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");
// 不显示内容 name.setNodeValue("不好使");
name.setTextContent("雷神");
book.appendChild(name);
// 为book节点添加属性
book.setAttribute("id", "1");
// 将book节点添加到bookstore根节点中
bookstore.appendChild(book);
// 将bookstore节点（已包含book）添加到dom树中
document.appendChild(bookstore);
// 创建TransformerFactory对象
TransformerFactory tff = TransformerFactory.newInstance();
// 创建 Transformer对象
Transformer tf = tff.newTransformer();
// 输出内容是否使用换行
tf.setOutputProperty(OutputKeys.INDENT, "yes");
// 创建xml文件并写入内容
tf.transform(new DOMSource(document), new StreamResult(new File("book1.xml")));
System.out.println("生成book1.xml成功");
} catch (Exception e) {
e.printStackTrace();
System.out.println("生成book1.xml失败");
}
}
}
生成结果：
二、Dom4j写入
import java.io.File;
import java.io.FileOutputStream;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.junit.Test;
public class Dom4jXml {
@Test
public void test(){
Long start = System.currentTimeMillis();
createXml();
System.out.println("运行时间："+ (System.currentTimeMillis() - start));
}
/**
* 生成xml方法
*/
public static void createXml(){
try {
// 1、创建document对象
Document document = DocumentHelper.createDocument();
// 2、创建根节点rss
Element rss = document.addElement("rss");
// 3、向rss节点添加version属性
rss.addAttribute("version", "2.0");
// 4、生成子节点及子节点内容
Element channel = rss.addElement("channel");
Element title = channel.addElement("title");
title.setText("国内最新新闻");
// 5、设置生成xml的格式
OutputFormat format = OutputFormat.createPrettyPrint();
// 设置编码格式
format.setEncoding("UTF-8");
// 6、生成xml文件
File file = new File("rss.xml");
XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
// 设置是否转义，默认使用转义字符
writer.setEscapeText(false);
writer.write(document);
writer.close();
System.out.println("生成rss.xml成功");
} catch (Exception e) {
e.printStackTrace();
System.out.println("生成rss.xml失败");
}
}
}
生成结果：
三、jDom写入
import java.io.File;
import java.io.FileOutputStream;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.junit.Test;
public class JDomXml {
@Test
public void test(){
Long start = System.currentTimeMillis();
createXml();
System.out.println("运行时间："+ (System.currentTimeMillis() - start));
}
/**
* 生成xml方法
*/
public static void createXml(){
try {
// 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("国内最新新闻");
channel.addContent(title);
Format format = Format.getCompactFormat();
// 设置换行Tab或空格
format.setIndent(" ");
format.setEncoding("UTF-8");
// 4、创建XMLOutputter的对象
XMLOutputter outputer = new XMLOutputter(format);
// 5、利用outputer将document转换成xml文档
File file = new File("rssNew.xml");
outputer.output(document, new FileOutputStream(file));
System.out.println("生成rssNew.xml成功");
} catch (Exception e) {
System.out.println("生成rssNew.xml失败");
}
}
}
生成结果：
四、Sax写入
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.junit.Test;
import org.xml.sax.helpers.AttributesImpl;
public class SaxXml {
@Test
public void test(){
List<Book> bList = new ArrayList<Book>();
Book b = new Book();
b.setName("冰与火之歌");
b.setAuthor("乔治马丁");
b.setId("1");
b.setLanguage("English");
b.setPrice("86");
b.setYear("2014");
bList.add(b);
Long start = System.currentTimeMillis();
createXml(bList);
System.out.println("运行时间："+ (System.currentTimeMillis() - start));
}
// 生成xml
public static void createXml(List<Book> bList){
// 1、创建一个SAXTransformerFactory类的对象
SAXTransformerFactory tff = (SAXTransformerFactory) SAXTransformerFactory.newInstance();
try {
// 2、通过SAXTransformerFactory创建一个TransformerHandler的对象
TransformerHandler handler = tff.newTransformerHandler();
// 3、通过handler创建一个Transformer对象
Transformer tr = handler.getTransformer();
// 4、通过Transformer对象对生成的xml文件进行设置
// 设置编码方式
tr.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
// 设置是否换行
tr.setOutputProperty(OutputKeys.INDENT, "yes");
// 5、创建一个Result对象
File f = new File("src/newbooks.xml");
// 判断文件是否存在
if(!f.exists()){
f.createNewFile();
}
Result result = new StreamResult(new FileOutputStream(f));
// 6、使RESULT与handler关联
handler.setResult(result);
// 打开document
handler.startDocument();
AttributesImpl attr = new AttributesImpl();
handler.startElement("", "", "bookstore", attr);
attr.clear();
for (Book book : bList) {
attr.clear();
attr.addAttribute("", "", "id", "", book.getId());
handler.startElement("", "", "book", attr);
// 创建name
attr.clear();
handler.startElement("", "", "name", attr);
handler.characters(book.getName().toCharArray(), 0, book.getName().length());
handler.endElement("", "", "name");
// 创建year
attr.clear();
handler.startElement("", "", "year", attr);
handler.characters(book.getYear().toCharArray(), 0, book.getYear().length());
handler.endElement("", "", "year");
// 创建author
if(book.getAuthor() != null && !"".equals(book.getAuthor().trim())){
attr.clear();
handler.startElement("", "", "author", attr);
handler.characters(book.getAuthor().toCharArray(), 0, book.getAuthor().length());
handler.endElement("", "", "author");
}
// 创建price
if(book.getPrice() != null && !"".equals(book.getPrice().trim())){
attr.clear();
handler.startElement("", "", "price", attr);
handler.characters(book.getPrice().toCharArray(), 0, book.getPrice().length());
handler.endElement("", "", "price");
}
// 创建language
if(book.getLanguage() != null && !"".equals(book.getLanguage().trim())){
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();
System.out.println("生成newbooks.xml成功");
} catch (Exception e) {
e.printStackTrace();
System.out.println("生成newbooks.xml失败");
}
}
}
生成结果：
五、其它
/**
* 四种方式总结
*
* dom基于tree，sax基于事件，JDOM和DOM4J基于底层API
*
* dom生成的内容会保存到内存中，方便删除和修改
* sax不能修改已经生成的标签
*
* 添加JUnit在Libraries选择Add Library中的JUnit即可
*
*/