XML中的SAX解析XML文件的问题BeanListHandler - 黑马程序员技术交流社区

package XMLDay;
import java.util.ArrayList;
import java.util.Iterator;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
public class Demo6 {
/**
* @param args
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
//获取工厂类
SAXParserFactory factory = SAXParserFactory.newInstance();
//获取解析器
SAXParser sp = factory.newSAXParser();
//获取XML读取器
XMLReader reader = sp.getXMLReader();
//确定数据的handler 处理类
BeanListHandle handle = new BeanListHandle();
reader.setContentHandler(handle);
//读取数据
reader.parse("src/book.xml");
//获取读取的XML数据
ArrayList<Book> list = handle.getBooks();
// 通过Iterator 迭代的方法，去除数据，我这儿有问题了
// Iterator<Book> it = list.iterator();
//
// while(it.hasNext()){
// Book book = it.next(); // 获取Book对象
// String name = book.getName();
// String author = book.getAuthor();
// String price = book.getPrice();
// System.out.println(name+"__"+author+"__"+price);
// }
}
}
//将获取的类变成对象
class BeanListHandle extends DefaultHandler{
private String currentName;
private ArrayList<Book> list = new ArrayList<Book>();
private Book book;
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
currentName = qName;
if("书".equals(currentName)){
this.book = new Book();
}
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if("书名".equals(currentName)){
String name = new String(ch,start,length);
book.setName(name);
}
if("作者".equals(currentName)){
String author = new String(ch,start,length);
book.setAuthor(author);
}
if("价格".equals(currentName)){
String prise = new String(ch,start,length);
book.setPrice(prise);
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
//将定义的标签给删掉
if(qName.equals("书")){
list.add(book);
book = null; //将Book数据初始化
}
currentName = null;//将当前的数据初始化
}
//获取List集合
//获取数据的Book数据
public ArrayList<Book> getBooks() {
return list;
}
}

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<?xml version="1.0" encoding="UTF-8"?>
<书架>
<书>
<书名>狂飙的yellowcong</书名>
<作者>yellowcong</作者>
<价格>100</价格>
</书>
<书>
<书名>狂飙的黑马</书名>
<作者>黑马</作者>
<价格>100</价格>
</书>
</书架>

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package XMLDay;
//建立一个书本类,来接受XML中的数据
public class Book {
private String name;
private String author;
private String price;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
}

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[XMLDay.Book@fd54d6, XMLDay.Book@1ccb029]

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null__null__null
null__null__null
[XMLDay.Book@fd54d6, XMLDay.Book@1ccb029]

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