XML文件解析

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="mars.xml"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".XMLActitity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="4" />	
    <uses-permission android:name="android.permission.INTERNET"/>
</manifest> 

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
	android:id="@+id/parseButton"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="开始解析XML"
	/>
</LinearLayout>

Mp3Info.java:

package mars.model;

public class Mp3Info {
	private String id;
	private String mp3Name;
	private String mp3Size;
	private String lrcName;
	private String lrcSize;
	public Mp3Info() {
		super();
	}
	public Mp3Info(String id, String mp3Name, String mp3Size, String lrcName,
			String lrcSize) {
		super();
		this.id = id;
		this.mp3Name = mp3Name;
		this.mp3Size = mp3Size;
		this.lrcName = lrcName;
		this.lrcSize = lrcSize;
	}
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getMp3Name() {
		return mp3Name;
	}
	public void setMp3Name(String mp3Name) {
		this.mp3Name = mp3Name;
	}
	public String getMp3Size() {
		return mp3Size;
	}
	public void setMp3Size(String mp3Size) {
		this.mp3Size = mp3Size;
	}
	public String getLrcName() {
		return lrcName;
	}
	public void setLrcName(String lrcName) {
		this.lrcName = lrcName;
	}
	public String getLrcSize() {
		return lrcSize;
	}
	public void setLrcSize(String lrcSize) {
		this.lrcSize = lrcSize;
	}
	@Override
	public String toString() {
		return "Mp3Info [id=" + id + ", lrcName=" + lrcName + ", lrcSize="
				+ lrcSize + ", mp3Name=" + mp3Name + ", mp3Size=" + mp3Size
				+ "]";
	}
}

FileUtils.java:

package mars.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.os.Environment;

public class FileUtils {
	private String SDPATH;

	public String getSDPATH() {
		return SDPATH;
	}
	public FileUtils() {
		//得到当前外部存储设备的目录
		// /SDCARD
		SDPATH = Environment.getExternalStorageDirectory() + "/";
	}
	/**
	 * 在SD卡上创建文件
	 * 
	 * @throws IOException
	 */
	public File creatSDFile(String fileName) throws IOException {
		File file = new File(SDPATH + fileName);
		file.createNewFile();
		return file;
	}
	
	/**
	 * 在SD卡上创建目录
	 * 
	 * @param dirName
	 */
	public File creatSDDir(String dirName) {
		File dir = new File(SDPATH + dirName);
		dir.mkdir();
		return dir;
	}

	/**
	 * 判断SD卡上的文件夹是否存在
	 */
	public boolean isFileExist(String fileName){
		File file = new File(SDPATH + fileName);
		return file.exists();
	}
	
	/**
	 * 将一个InputStream里面的数据写入到SD卡中
	 */
	public File write2SDFromInput(String path,String fileName,InputStream input){
		File file = null;
		OutputStream output = null;
		try{
			creatSDDir(path);
			file = creatSDFile(path + fileName);
			output = new FileOutputStream(file);
			byte buffer [] = new byte[4 * 1024];
			while((input.read(buffer)) != -1){
				output.write(buffer);
			}
			output.flush();
		}
		catch(Exception e){
			e.printStackTrace();
		}
		finally{
			try{
				output.close();
			}
			catch(Exception e){
				e.printStackTrace();
			}
		}
		return file;
	}

}

HttpDownloader.java:

package mars.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


public class HttpDownloader {
	private URL url = null;

	/**
	 * 根据URL下载文件，前提是这个文件当中的内容是文本，函数的返回值就是文件当中的内容
	 * 1.创建一个URL对象
	 * 2.通过URL对象，创建一个HttpURLConnection对象
	 * 3.得到InputStram
	 * 4.从InputStream当中读取数据
	 * @param urlStr
	 * @return
	 */
	public String download(String urlStr) {
		StringBuffer sb = new StringBuffer();
		String line = null;
		BufferedReader buffer = null;
		try {
			// 创建一个URL对象
			url = new URL(urlStr);
			// 创建一个Http连接
			HttpURLConnection urlConn = (HttpURLConnection) url
					.openConnection();
			// 使用IO流读取数据
			buffer = new BufferedReader(new InputStreamReader(urlConn
					.getInputStream()));
			while ((line = buffer.readLine()) != null) {
				sb.append(line);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				buffer.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}

	/**
	 * 该函数返回整形 -1：代表下载文件出错 0：代表下载文件成功 1：代表文件已经存在
	 */
	public int downFile(String urlStr, String path, String fileName) {
		InputStream inputStream = null;
		try {
			FileUtils fileUtils = new FileUtils();
			
			if (fileUtils.isFileExist(path + fileName)) {
				return 1;
			} else {
				inputStream = getInputStreamFromUrl(urlStr);
				File resultFile = fileUtils.write2SDFromInput(path,fileName, inputStream);
				if (resultFile == null) {
					return -1;
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
			return -1;
		} finally {
			try {
				inputStream.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return 0;
	}

	/**
	 * 根据URL得到输入流
	 * 
	 * @param urlStr
	 * @return
	 * @throws MalformedURLException
	 * @throws IOException
	 */
	public InputStream getInputStreamFromUrl(String urlStr)
			throws MalformedURLException, IOException {
		url = new URL(urlStr);
		HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
		InputStream inputStream = urlConn.getInputStream();
		return inputStream;
	}
}

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, 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();
	}

}

test.xml:

XMLActivity.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;

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{

		@Override
		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();
			}
		}
    	
    }
}

点击"开始解析XML"按钮后,输出如下: