SAX解析文件

  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  /**
   * 1.新建一个SAX解析工厂实例
   * 2.new一个解析器
   * 3.new一个解析处理器
   * 4.解析文件
   * 5.获取信息
  * @author Administrator
  *
  */
 public class SAXParserDemo {

     public static void main(String[] args) {
         SAXParserFactory factory = SAXParserFactory.newInstance();// 工厂模式，单例模式
         try {
             /* 获得一个sax解析器 */
             SAXParser parser = factory.newSAXParser();
             /* 解析器解析这个文件，new一个解析处理器 */
             SAXParserHandler sax = new SAXParserHandler();
             parser.parse("books.xml", sax);
             System.out.println("几本书：" + sax.booklist.size());

             for (Book book : sax.booklist) {
                 System.out.println(book.getId());
                 System.out.println(book.getName());
                 System.out.println(book.getPrice());
                 System.out.println(book.getAuthor());

             }

         } catch (ParserConfigurationException e) {

            e.printStackTrace();
         } catch (Exception e) {

             e.printStackTrace();
         }
     }

 }

 package SAXParser1;

 import java.util.ArrayList;

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

 /**
  * @author xuhua 解析处理器
  * 1.重写方法
  */
 public class SAXParserHandler extends DefaultHandler {
     /* 全局变量 */
     Book book;
     String value;
     ArrayList<Book> booklist = new ArrayList<Book>();

     /**
      * 解析开始
      */
     @Override
     public void startDocument() throws SAXException {
         super.startDocument();
         System.out.println("parse start");
     }

     /**
      * 解析结束
      */
     @Override
     public void endDocument() throws SAXException {
         super.endDocument();
         System.out.println("parse end");
     }

     /**
      * 开始解析标签
      * qName:标签名字  Attributes：属性
      */
     @Override
     public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

         super.startElement(uri, localName, qName, attributes);

         if (qName.equals("book")) {
             book = new Book();
             String id = attributes.getValue("id");//获取id属性值
             System.out.println(id);

             /* 获取属性名与属性值 */
             int num = attributes.getLength(); // 属性个数
             for (int i = 0; i < num; i++) {
                 System.out.println("属性名：" + attributes.getQName(i));
                 System.out.println("属性值：" + attributes.getValue(i));
                 /* 把id属性值set进book实体中 */
                 if (attributes.getQName(i).equals("id")) {
                     book.setId(attributes.getValue(i));
                 }
             }
         }

         System.out.println("属性名：" + qName);
     }

     /**
      * 结束标签解析
      */
     @Override
     public void endElement(String uri, String localName, String qName) throws SAXException {

         super.endElement(uri, localName, qName);
         if (qName.equals("book")) {
             booklist.add(book);
             book = null;
             System.out.println("==============结束遍历某一本书的内容=============");
         }
         /* id为book节点的属性，其他为节点值 */
         // else if(qName.equals("id"))
         // {
         // book.setId(value);
         // }
         else if (qName.equals("name")) {
             book.setName(value);
         } else if (qName.equals("price")) {
             book.setPrice(value);
         } else if (qName.equals("author")) {
             book.setAuthor(value);
         }
         System.out.println(qName + "元素结束");

     }

     /**
      * 获取节点值
      */
     @Override
     public void characters(char[] ch, int start, int length) throws SAXException {

         super.characters(ch, start, length);
         /**/
         value = new String(ch, start, length);
         // if(value.trim()!=null)
         if (!value.trim().equals("")) // 标签之间存在空格
             System.out.println(value);
     }

 }

解析处理器

 package SAXParser1;

 public class Book {
     private String id;
     private String name;
     private String price;
     private String author;
     public String getId() {
         return id;
     }
     public void setId(String id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public String getPrice() {
         return price;
     }
     public void setPrice(String price) {
         this.price = price;
     }
     public String getAuthor() {
         return author;
     }
     public void setAuthor(String author) {
         this.author = author;
     }

 }

book实体javabean

 <?xml version="1.0" encoding="utf-8"?>
 <bookstore>
     <book id="1">
         <name>java入门</name>
         <price>80</price>
         <author>张思</author>
     </book>
     <book id="2">
         <name>java进阶</name>
         <price>90</price>
         <author>叶东</author>
     </book>

 </bookstore>

xml文件