解析和新建一个xml文件

package cn.xml.bean;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlSerializer;
import android.util.Log;
import android.util.Xml;
public class PullParseXml {
public static  List<Book> readXml(InputStream instream)throws Exception
{
List<Book> books=null;
Book book=null;
//获取XmlPullParser对象
XmlPullParser parser=Xml.newPullParser();
//设置要解析的xml文件输入流,并且采用UTF-8编码
parser.setInput(instream, "UTF-8");
int event=parser.getEventType();
while(event!=XmlPullParser.END_DOCUMENT)
{
switch(event)
{
case XmlPullParser.START_DOCUMENT :
books=new ArrayList<Book>();
Log.i("BBB", "########welcome you!");
break;
case XmlPullParser.START_TAG :
if("book".equals(parser.getName()))
{
book=new Book();
int id=Integer.valueOf(parser.getAttributeValue(0));
book.setId(id);
}else if("bookName".equals(parser.getName())){
String bookName=parser.nextText();
book.setBookName(bookName);
}else if("author".equals(parser.getName())){
String author=parser.nextText();
book.setAuthor(author);
}else if("price".equals(parser.getName())){
double price=Double.valueOf(parser.nextText());
book.setPrice(price);
}
break;
case XmlPullParser.END_TAG :
if("book".equals(parser.getName()))
{
books.add(book);
}
}
event=parser.next();
}
instream.close();
return books;
}
//新建一个xml文件
public static void writeXml(List<Book> books,OutputStream outStream) throws Exception
{
XmlSerializer serializer=Xml.newSerializer();
serializer.setOutput(outStream,"UTF-8");
serializer.startDocument("UTF-8",true);
serializer.startTag(null, "books");
for(Book book : books)
{
serializer.startTag(null,"book");
serializer.attribute(null, "id", book.getId()+"");
serializer.startTag(null,"bookName");
serializer.text(book.getBookName());
serializer.endTag(null,"bookName");
serializer.startTag(null,"author");
serializer.text(book.getAuthor());
serializer.endTag(null,"author");
serializer.startTag(null,"price");
serializer.text(book.getPrice()+"");
serializer.endTag(null,"price");
serializer.endTag(null,"book");
}
serializer.endTag(null, "books");
serializer.endDocument();
outStream.flush();//强制缓冲区中的数据被写出
outStream.close();
}
}

xml文件

牛博文 13:42:25
<?xml version="1.0" encoding="UTF-8"?>
<books>
<book id="321">
<bookName>Android基础</bookName>
<author>张三</author>
<price>2.58</price>
</book>
<book id="322">
<bookName>Android游戏开发</bookName>
<author>李四</author>
<price>1.2</price>
</book>
<book id="323">
<bookName>三个男人和一女人的故事</bookName>
<author>王五</author>
<price>24.5</price>
</book>
</books>