XML解析

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.Locator;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.DefaultHandler;
import java.io.IOException;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

class TestSAX extends DefaultHandler {

private StringBuffer buf;

public TestSAX() {

super();
}
public void setDocumentLocator(Locator locator) {

}

public void startDocument() throws SAXException {

buf=new StringBuffer();
System.out.println("*******开始解析文档*******");
}
public void endDocument() throws SAXException {

System.out.println("*******文档解析结束*******");
}

public void startPrefixMapping( String prefix, String uri ) {

System.out.println("\n前缀映射: " + prefix +" 开始!"+ " 它的URI是:" + uri);
}

public void endPrefixMapping( String prefix ) {

System.out.println("\n前缀映射: "+prefix+" 结束!");
}
public void processingInstruction( String target, String instruction )throws SAXException {

}
public void ignorableWhitespace( char[] chars, int start, int length ) throws SAXException {

}

public void skippedEntity( String name ) throws SAXException {

}

public void startElement(String namespaceURI,String localName,String qName,Attributes atts) {

System.out.println("*******开始解析元素*******");
System.out.println("元素名"+qName);
for(int i=0;i<atts.getLength();i++) {
System.out.println("元素名"+atts.getLocalName(i)+"属性值"+atts.getValue(i));
}
}

public void endElement(String namespaceURI,String localName,String fullName )throws SAXException {

System.out.println("******元素解析结束********");
}
public void characters( char[] chars, int start, int length )throws SAXException {

//将元素内容累加到StringBuffer中
buf.append(chars,start,length);
}

public static void main(String args[]) {
try{

SAXParserFactory sf = SAXParserFactory.newInstance();
SAXParser sp = sf.newSAXParser();
TestSAX testsax=new TestSAX();
sp.parse(new InputSource("http://dh.perun.cn/map/GetRoundNodes.aspx?lng=121.44117&lat=31.18953&radius=0.5&typename=BG&mobile=13022198722"),testsax);

}catch(IOException e) {
e.printStackTrace();
}catch(SAXException e) {

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

}
}