使用jsr172解析xml

基类：

import java.io.ByteArrayInputStream;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public abstract class BaseHandler extends DefaultHandler {

	public abstract boolean parse(byte[] byteAarray);

	public static void parserXml(BaseHandler baseHandler,byte[] byteAarray)
			throws Exception {
		if (byteAarray == null || byteAarray.length == 0)
			return;
		ByteArrayInputStream bis = new ByteArrayInputStream(byteAarray);
		SAXParserFactory factory = SAXParserFactory.newInstance();
		factory.newSAXParser().parse(bis,baseHandler);
		bis.close();
	}

	public abstract void characters(char[] ch,int start,int length)
			throws SAXException;

	public abstract void endDocument() throws SAXException;

	public abstract void endElement(String uri,String localName,String name)
			throws SAXException;

	public abstract void startDocument() throws SAXException;

	public abstract void startElement(String uri,String tagName,Attributes attributes) throws SAXException;

}

使用jsr182解析xml，最主要的还是要实现characters()和startElement()方法。
startElement()方法中可以使用attributes.getValue("XXX")获得属性值；
characters()方法中使用String chars = new String(ch,start,length).trim();获得文本。
至于endElement()和endDocument()方法，可以在其中实现一些“收尾”工作。
具体的实现类可以参考下面这个类：

import java.util.Stack;
import java.util.Vector;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import com.tlt.app.App;
import com.tlt.model.Supplement;
import com.tlt.model.User;
import com.tlt.util.Consts;
import com.tlt.view.SupplementPage;
import com.tlt.view.item.Dialog;

public class SupplementHandler extends BaseHandler {
	public boolean parse(byte[] byteAarray) {
		// TODO Auto-generated method stub
		try {
			super.parserXml(this,byteAarray);
			return true;
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		}
	}
	
	public void characters(char[] ch,int length)
			throws SAXException {
		// TODO Auto-generated method stub
		String chars = new String(ch,length).trim();
//		System.out.println("the character is "+chars);
		if(chars.length() > 0) {
			String tagName = (String)tagStack.peek();//查看栈顶对象而不移除它
			Supplement current = (Supplement)supplements.lastElement();
			//<message><head><messageId>20100825110225890</messageId><result>0000</result><encryptionType>0</encryptionType><md>bdc5e43a0368c0ea8400960ed75d088a</md></head><body><orderId>TX201008251102240001</orderId><billNo>20100825110225890</billNo><userId>50</userId><fundsAccount>33900</fundsAccount><time>20100825110224</time><reserve></reserve></body></message>
			if (tagName.equals("messageId")) {
				current.setMessageId(chars);
			}else if(tagName.equals("result")){
				current.setResult(chars);
			}else if(tagName.equals("encryptionType")){
				current.setEncryptionType(chars);
			}else if(tagName.equals("md")){
				current.setMd(chars);
			}
			else if(tagName.equals("errorMsg")) {
				current.setErrorMsg(chars);
			}else if(tagName.equals("orderId")) {
				current.setOrderId(chars);
			}else if(tagName.equals("billNo")) {
				current.setBillNo(chars);
			}else if(tagName.equals("userId")) {
				current.setUserId(chars);
			}else if(tagName.equals("fundsAccount")) {
				current.setFundsAccount(chars);
			}else if(tagName.equals("time")) {
				current.setTime(chars);
			}else if(tagName.equals("reserve")) {
				current.setReserve(chars);
			}
			
		}
	}

	public void endDocument() throws SAXException {
		// TODO Auto-generated method stub
		Consts.hash.put("supplement",supplements.lastElement());
		Supplement supplement=(Supplement)supplements.lastElement();
		if(supplement.getResult().equals(Consts.result)){
			SupplementPage.resultDialog=new Dialog(App.app.canvas,"消息","充值成功！",0);
			User user=(User)Consts.hash.get("user");
			user.setFundsAccount(supplement.getFundsAccount());
			Consts.hash.put("user",user);//更新user
			SupplementPage.reset();
		}else{
			SupplementPage.resultDialog=new Dialog(App.app.canvas,"充值失败！"+supplement.getErrorMsg(),0);
		}
		supplements=null;
	}

	public void endElement(String uri,String name)
			throws SAXException {
		// TODO Auto-generated method stub
		tagStack.pop();//移除栈顶对象并作为此函数的值返回该对象
	}

	public void startDocument() throws SAXException {
		// TODO Auto-generated method stub

	}
	private Stack tagStack = new Stack();
	private Vector supplements = new Vector();
	public void startElement(String uri,Attributes attributes) throws SAXException {
		// TODO Auto-generated method stub
		if(tagName.equals("message")) {
			Supplement entity = new Supplement();
			supplements.addElement(entity);
		}if (tagName.equals("lottery")) {
			LotterySimpleInfo instance=new LotterySimpleInfo();
			instance.setWinTermNo(attributes.getValue("winTermNo"));
			instance.setLotteryResult(attributes.getValue("lotteryResult"));
			instance.setTermNo(attributes.getValue("termNo"));
			instance.setDeadLine(attributes.getValue("deadLine"));
			lotterys.addElement(instance);
		}
		tagStack.push(tagName);
	}

}

用法：

BaseHandler handler=new LoginHandler();
handler.parse(data);

使用jsr172解析xml

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