xml的创建与解析

写一个很简单的例子记录一下XML的创建与解析。

创建与解析其实是两个互逆的过程，会了其中一个对应的就能写出来。

创建用XmlSerializer xmlSerializer=Xml.newSerializer();

解析用XmlPullParser xmlPullParser=Xml.newPullParser();

package com.example.xmlborn;

import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlSerializer;

import android.R.xml;
import android.os.Bundle;
import android.app.Activity;
import android.util.Xml;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
	Button xmlpullButton;
	private String result;
	private TextView textView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		String resource=produceXML();
		textView=(TextView) findViewById(R.id.text);
		xmlpullButton=(Button) findViewById(R.id.button1);
		xmlpullButton.setOnClickListener(this);
	}
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.button1:
			result=parseXML();
			if (result!=null) {
				textView.setText(result);
			}else {
				Toast.makeText(getApplicationContext(),"null",1000).show();
			}
			
			break;

		default:
			break;
		}
	}
	private String produceXML() {
		// TODO Auto-generated method stub
		StringWriter writer=new StringWriter();
		XmlSerializer xmlSerializer=Xml.newSerializer();
		ArrayList<Beauty> list=getData();
		try {
			xmlSerializer.setOutput(writer);
			xmlSerializer.startDocument("UTF-8",true);
			xmlSerializer.startTag(null,"beauties");
			for (Beauty beauty:list) {
			
				xmlSerializer.startTag(null,"beautyname");
				xmlSerializer.text(beauty.getNameString());
				xmlSerializer.endTag(null,"beautyname");
				xmlSerializer.startTag(null,"age");
				xmlSerializer.text(beauty.getAge());
				xmlSerializer.endTag(null,"age");
				
			}
			xmlSerializer.endTag(null,"beauties");
			xmlSerializer.endDocument();
			
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return writer.toString();
	}

	private ArrayList<Beauty> getData() {
		// TODO Auto-generated method stub
		ArrayList<Beauty> list=new ArrayList<Beauty>();
		Beauty lily=new Beauty("lily","23");
		Beauty lucy=new Beauty("lucy","36");
		list.add(lily);
		list.add(lucy);
		return list;
	}
	
	

	private String parseXML() {
		result="通过pull解析结果为：";
		String xmlString=produceXML();
		StringReader in=new StringReader(xmlString);
	XmlPullParser xmlPullParser=Xml.newPullParser();
	try {
		xmlPullParser.setInput(in);
		int type=xmlPullParser.getEventType();
		while (type!=XmlPullParser.END_DOCUMENT) {
		String nodeName=xmlPullParser.getName();
		switch (type) {
		case XmlPullParser.START_TAG:
			if("beautyname".equals(nodeName)){
				result +="姓名："+xmlPullParser.nextText();
			}if ("age".equals(nodeName)) {
				result +="年龄:"+xmlPullParser.nextText();
			}
			break;

		
		}
		type=xmlPullParser.next();
		}
	} catch (XmlPullParserException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
		return result;
		// TODO Auto-generated method stub
		
	}
	
class Beauty{
		
		String nameString,age;
		
		public String getNameString() {
			return nameString;
		}

		public void setNameString(String nameString) {
			this.nameString = nameString;
		}

		public String getAge() {
			return age;
		}

		public void setAge(String age) {
			this.age = age;
		}

		public Beauty(String nameString, String age) {
			super();
			this.nameString = nameString;
			this.age = age;
		}
		
	}
}

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