学步园

SAX是一种占用内存少且解析速度快的解析器，它采用的是事件启动，它不需要解析完整个文档，而是按照内容顺序 看文档某个部分是否符合xml语法，如果符合就触发相应的事件，所谓的事件就是些回调方法（callback）,这些方法 定义在ContentHandler中，下面是其主要方法：

startDocument:当遇到文档的时候就触发这个事件 调用这个方法 可以在其中做些预处理工作

startElement: (String namespaceURI,String localName,String qName,Attributes atts)当遇开始标签的时候就会触发这个方法。

endElement（String uri,String localName,String name）：当遇到结束标签时触发这个事件，调用此法可以做些善后工作。

charachers(char [] ch,int start,int length):当遇到xml内容时触发这个方法，用new String(ch,start,length)可以接受内容。

MyContentHandler.java

package mars.xml;</p> <p>import org.xml.sax.Attributes;<br /> import org.xml.sax.SAXException;<br /> import org.xml.sax.helpers.DefaultHandler;</p> <p>public class MyContentHandler extends DefaultHandler {<br /> String hisname, address, money, sex, status;<br /> String tagName;</p> <p> public void startDocument() throws SAXException {<br /> System.out.println("````````begin````````");<br /> }</p> <p> public void endDocument() throws SAXException {<br /> System.out.println("````````end````````");<br /> }</p> <p> public void startElement(String namespaceURI, String localName,<br /> String qName, Attributes attr) throws SAXException {<br /> tagName = localName;<br /> if (localName.equals("worker")) {<br /> //获取标签的全部属性<br /> for (int i = 0; i < attr.getLength(); i++) {<br /> System.out.println(attr.getLocalName(i) + "=" + attr.getValue(i));<br /> }<br /> }<br /> }</p> <p> public void endElement(String namespaceURI, String localName, String qName)<br /> throws SAXException {<br /> //在workr标签解析完之后，会打印出所有得到的数据<br /> tagName = "";<br /> if (localName.equals("worker")) {<br /> this.printout();<br /> }<br /> }<br /> public void characters(char[] ch, int start, int length)<br /> throws SAXException {<br /> if (tagName.equals("name"))<br /> hisname = new String(ch, start, length);<br /> else if (tagName.equals("sex"))<br /> sex = new String(ch, start, length);<br /> else if (tagName.equals("status"))<br /> status = new String(ch, start, length);<br /> else if (tagName.equals("address"))<br /> address = new String(ch, start, length);<br /> else if (tagName.equals("money"))<br /> money = new String(ch, start, length);<br /> }</p> <p> private void printout() {<br /> System.out.print("name: ");<br /> System.out.println(hisname);<br /> System.out.print("sex: ");<br /> System.out.println(sex);<br /> System.out.print("status: ");<br /> System.out.println(status);<br /> System.out.print("address: ");<br /> System.out.println(address);<br /> System.out.print("money: ");<br /> System.out.println(money);<br /> System.out.println();<br /> }</p> <p>}<br />

XMLActitity.java

package mars.xml;</p> <p>import java.io.StringReader;</p> <p>import javax.xml.parsers.SAXParserFactory;</p> <p>import mars.utils.HttpDownloader;</p> <p>import org.xml.sax.InputSource;<br /> import org.xml.sax.XMLReader;</p> <p>import android.app.Activity;<br /> import android.os.Bundle;<br /> import android.view.View;<br /> import android.view.View.OnClickListener;<br /> import android.widget.Button;</p> <p>public class XMLActitity extends Activity {<br /> /** Called when the activity is first created. */<br /> private Button parseButton ;<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> setContentView(R.layout.main);<br /> parseButton = (Button)findViewById(R.id.parseButton);<br /> parseButton.setOnClickListener(new ParseButtonListener());<br /> }</p> <p> class ParseButtonListener implements OnClickListener{</p> <p> public void onClick(View v) {<br /> HttpDownloader hd = new HttpDownloader();<br /> String resultStr = hd.download("http://192.168.1.107:8081/voa1500/test.xml");<br /> System.out.println(resultStr);<br /> try{<br /> //创建一个SAXParserFactory<br /> SAXParserFactory factory = SAXParserFactory.newInstance();<br /> XMLReader reader = factory.newSAXParser().getXMLReader();<br /> //为XMLReader设置内容处理器<br /> reader.setContentHandler(new MyContentHandler());<br /> //开始解析文件<br /> reader.parse(new InputSource(new StringReader(resultStr)));<br /> }<br /> catch(Exception e){<br /> e.printStackTrace();<br /> }<br /> }</p> <p> }<br /> }