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: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;
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, 易做图, 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("易做图"))
易做图 = 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("易做图: ");
System.out.println(易做图);
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();
}
}
XMLActitity.java
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;
www.zzzyk.com
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/易做图1500/test.xml");
System.out.println(resultStr);
try{
//创建一个SAXParserFactory
补充:移动开发 , Android ,