SAX解析xml(自用)

package com.huawei.t0906_SAX;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;


public class SaxParserXml extends DefaultHandler
{
// xml文件的路径
private static final String PATH = "test_book.xml";

private List<Book> books = null;

private Book book;

// 用来记录解析时上一个节点的名称
private String preTag = null;

public static List<Book> getBooks(InputStream is) throws ParserConfigurationException, SAXException, IOException
{
SAXParserFactory sf = SAXParserFactory.newInstance();
SAXParser sp = sf.newSAXParser();

SaxParserXml spx = new SaxParserXml();
sp.parse(is, spx);

return spx.getBooks();
}

private List<Book> getBooks()
{
return books;
}

@Override
public void startDocument() throws SAXException
{
books = new ArrayList<Book>();
}

@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException
{
if ("book".equals(qName))
{
book = new Book();
book.setId(attributes.getValue(0));
}

// 将正在解析的节点赋给preTag
preTag = qName;
}

@Override
public void endElement(String uri, String localName, String qName)
throws SAXException
{
if ("book".equals(qName))
{
books.add(book);
book = null;
}
preTag = null;
}

@Override
public void characters(char[] ch, int start, int length)
throws SAXException
{
String content = new String(ch, start, length);
if ("name".equals(preTag))
{
book.setName(content);
}
else if ("price".equals(preTag))
{
book.setPrice(Double.valueOf(content));
}
}

public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException
{
InputStream is = new SaxParserXml().getClass().getClassLoader().getResourceAsStream(PATH);

List<Book> books = getBooks(is);

for (Book b : books)
{
System.out.println(b);
}
}


}
------------------------DOM----------------------------
package com.huawei.t0906_DOM2;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

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

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

public class DomPaseXml_Element
{
// xml文件路径
private static final String PATH = "test_book.xml";
/**
* dom 解析xml
*
* @param input
* @return
* @throws ParserConfigurationException
* @throws SAXException
* @throws IOException [参数说明]
*
* @return List<Book> [返回类型说明]
* @exception throws [违例类型] [违例说明]
* @see [类、类#方法、类#成员]
*/
public static List<Book> getBooks(InputStream input) throws ParserConfigurationException, SAXException, IOException
{
List<Book> books = new ArrayList<Book>();
DocumentBuilderFactory df = DocumentBuilderFactory.newInstance();
DocumentBuilder db = df.newDocumentBuilder();
Document document = db.parse(input);
Element element = document.getDocumentElement();

// 获得book
NodeList bookNodes = element.getElementsByTagName("book");

// book集合的长度
int length1 = bookNodes.getLength();

for (int i = 0; i < length1; i++)
{
Element bookElememt = (Element)bookNodes.item(i);
Book book = new Book();
// 设置图书id
book.setId(bookElememt.getAttribute("id"));

NodeList childNodes = bookElememt.getChildNodes();

// book元素下的长度
int length2 = childNodes.getLength();

for (int j = 0; j < length2; j++)
{
if (childNodes.item(j).getNodeType() == Node.ELEMENT_NODE)
{
if ("name".equals(childNodes.item(j).getNodeName()))
{
book.setName(childNodes.item(j).getFirstChild().getNodeValue());
}
else if ("price".equals(childNodes.item(j).getNodeName()))
{
book.setPrice(Double.valueOf(childNodes.item(j).getFirstChild().getNodeValue()));
}
} // end of - if()
} // end of - for(j)

// 添加图书
books.add(book);
} // end of for(i)

return books;
}

public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException
{
// 构建xml文件的数据流
InputStream is = new DomPaseXml_Element().getClass().getClassLoader().getResourceAsStream(PATH);

// 解析xml获得实力数据
List<Book> list = getBooks(is);

for (Book b : list)
{
System.out.println(b.getId() + "-" + b);
}

}

}