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 localName,
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 start, int length)
throws SAXException {
// TODO Auto-generated method stub
String chars = new String(ch, start, 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,"消息","充值失败！"+supplement.getErrorMsg(),0);
}
supplements=null;
}
public void endElement(String uri, String localName, 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, String localName, String tagName,
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);