Android学习笔记之XML解析（SAX）

     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：    <div>     <br />    </div>    <div>     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    </div>    <div>     <br />    </div>    <div>     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。    </div>    <div>     <br />    </div>    <div>     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。    </div>    <div>     <br />    </div>    <div>     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。    </div>    <div>     MyContentHandler.java     <pre class="brush:java; toolbar: true; auto-links: false;">package mars.xml;  import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler;  public class MyContentHandler extends DefaultHandler {  String hisname, address, money, sex, status;  String tagName;   public void startDocument() throws SAXException {   System.out.println("````````begin````````");  }   public void endDocument() throws SAXException {   System.out.println("````````end````````");  }   public void startElement(String namespaceURI, String localName,    String qName, Attributes attr) throws SAXException {   tagName = localName;   if (localName.equals("worker")) {    //获取标签的全部属性    for (int i = 0; i < attr.getLength(); i++) {     System.out.println(attr.getLocalName(i) + "=" + attr.getValue(i));    }   }  }   public void endElement(String namespaceURI, String localName, String qName)    throws SAXException {   //在workr标签解析完之后，会打印出所有得到的数据   tagName = "";   if (localName.equals("worker")) {    this.printout();   }  }  public void characters(char[] ch, int start, int length)    throws SAXException {   if (tagName.equals("name"))    hisname = new String(ch, start, length);   else if (tagName.equals("sex"))    sex = new String(ch, start, length);   else if (tagName.equals("status"))    status = new String(ch, start, length);   else if (tagName.equals("address"))    address = new String(ch, start, length);   else if (tagName.equals("money"))    money = new String(ch, start, length);  }   private void printout() {   System.out.print("name: ");   System.out.println(hisname);   System.out.print("sex: ");   System.out.println(sex);   System.out.print("status: ");   System.out.println(status);   System.out.print("address: ");   System.out.println(address);   System.out.print("money: ");   System.out.println(money);   System.out.println();  }  }</pre>XMLActitity.java     <pre class="brush:java; toolbar: true; auto-links: false;">package mars.xml;  import java.io.StringReader;  import javax.xml.parsers.SAXParserFactory;  import mars.utils.HttpDownloader;  import org.xml.sax.InputSource; import org.xml.sax.XMLReader;  import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button;  public class XMLActitity extends Activity {     /** Called when the activity is first created. */  private Button parseButton ;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         parseButton = (Button)findViewById(R.id.parseButton);         parseButton.setOnClickListener(new ParseButtonListener());     }          class ParseButtonListener implements OnClickListener{    public void onClick(View v) {    HttpDownloader hd = new HttpDownloader();    String resultStr = hd.download("http://192.168.1.107:8081/voa1500/test.xml");    System.out.println(resultStr);    try{     //创建一个SAXParserFactory     SAXParserFactory factory = SAXParserFactory.newInstance();     XMLReader reader = factory.newSAXParser().getXMLReader();     //为XMLReader设置内容处理器     reader.setContentHandler(new MyContentHandler());     //开始解析文件     reader.parse(new InputSource(new StringReader(resultStr)));    }    catch(Exception e){     e.printStackTrace();    }   }           } }</pre>来自：     <a href="/misc/goto?guid=4959517695481649561" target="_blank">http://blog.csdn.net/sjf0115/article/details/7222591</a>    </div>