java中使用xml

//DOM方式
package com.neusoft.xml;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class DomXmlSample {

 /**
  * @param args
  * @throws ParserConfigurationException
  * @throws IOException
  * @throws SAXException
  */
 public static void main(String[] args) throws ParserConfigurationException,
   SAXException, IOException {
  // TODO Auto-generated method stub
  // 1.获得一个新DocumentBuilderFactory实例(定义工厂API，使应用程序能够从 XML 文档获取生成 DOM
  // 对象树的解析器)
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  // 2.使用DocumentBuilderFactory构建DocumentBuilder(定义 API， 使其从 XML 文档获取 DOM
  // 文档实例。使用此类，应用程序员可以从 XML 获取一个 Document)
  DocumentBuilder db = dbf.newDocumentBuilder();
  // 3.使用DocumentBuilder的parse（）方法解析文件
  // 4.将已解析的文档存储在Document对象中
  Document document = db.parse("testDocument.xml");
  // 5.使用getElementsByTagName（）方法获得元素
  NodeList bookList = document.getElementsByTagName("book");

  // 获取所有的子节点
  for (int i = 0; i < bookList.getLength(); i++) {
   System.out.println("========第" + i + "记录============");
   Node node = bookList.item(i);
   NodeList childNodes = node.getChildNodes();
   for (int j = 0; j < childNodes.getLength(); j++) {
    Node childN = childNodes.item(j);
    if (childN.getFirstChild() != null) {
     System.out.print(childN.getNodeName());
     System.out.println(":"
       + childN.getFirstChild().getNodeValue());
    }
   }
  }
 }

}

 

 

 

 

package com.neusoft.xml;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;

public class JdomXmlSample {

 /**
  * @param args
  * @throws IOException
  * @throws JDOMException
  */
 public static void main(String[] args) throws JDOMException, IOException {
  // TODO Auto-generated method stub
  
SAXBuilder builder=new SAXBuilder(false);//表示使用默认的解析器
Document document=builder.build("testDocument.xml");
Element root=document.getRootElement();

List books=root.getChildren("book");
for(int i=0;i<books.size();i++)
{
 Element book=(Element)books.get(i);
 Element code=book.getChild("code");
 Element title=book.getChild("title");
 Element author=book.getChild("author");
 Element price=book.getChild("price");
 
 System.out.println("code="+code.getText()+"\t"+"title="+title.getText()
                +"\tauthor="+author.getText()+"\t"+"price="+price.getText());
 
// System.out.println("code:"+book.getChildText("code")+
//              "\ttitle:"+book.getChildText("title")
//              +"\tauthor:"+book.getChildText("author")+
//              "\tprice:"+book.getChildText("price"));
 book.getChild("price").setText("100");
 }
XMLOutputter  outputter=new XMLOutputter();
outputter.output(document, new FileOutputStream("abc.xml"));

 }

}

 

 

 

 

a.xml

<?xml version="1.0" encoding="gb2312"?>
<!DOCTYPE abc [
<!ELEMENT note (男|女)>
]>
<abc>
<note>男</note>

</abc>

abc.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE booklist>
<booklist>
 <book>
  <code>1</code>
  <title>XML讲解</title>
  <author>张三</author>
  <price>100</price>
 </book>
 <book>
  <code>2</code>
  <title>HTML讲解</title>
  <author>李四</author>
  <price>100</price>
 </book>
 <book>
  <code>3</code>
  <title>JSP讲解</title>
  <author>王五</author>
  <price>100</price>
 </book>
  
</booklist>

testDocument.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE booklist>
<booklist>
 <book>
  <code>1</code>
  <title>XML讲解</title>
  <author>张三</author>
  <price>100</price>
 </book>
 <book>
  <code>2</code>
  <title>HTML讲解</title>
  <author>李四</author>
  <price>100</price>
 </book>
 <book>
  <code>3</code>
  <title>JSP讲解</title>
  <author>王五</author>
  <price>100</price>
 </book>
  
</booklist>

xmltest.dtd

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT booklist (book)+>
<!ELEMENT book (code,title,author,price)>
<!ELEMENT code (#PCDATA)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT price  (#PCDATA)>
<!ATTLIST book id ID #REQUIRED
               type (IT|科普) "科普">