01_20_XML文件解析

01_20_XML文件解析

//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;

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("");
            System.out.println(resultStr);


            /*1、创建一个SAXParserFactory：factoryy = SAXParserFactory.newInstance()
             *2、创建一个XMLReader：reader = factory.newSAXParser().getXMLReader()
             *3、为XMLReader设置内容处理器：reader.setContentHandler(new MyContentHandler());
             *4、开始解析文件：reader.parse(new InputSource(new StringReader(resultStr)))
             *        String ->StringReader ->InputSource ->parse*/

            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();
            }
        }
    }
}

//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````````");
    }

    /*startElement(String namespaceURI, String localName,
            String qName, Attributes attr)
     * namespaceURI:表命名空间
     * localName:没有前缀的标签
     * qName:表带前缀的标签
     * attr:表标签的属性*/
    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();
        }
    }

    /*characters(char[] ch, int start, int length)得到标签的内容
     * ch[] 存放读到的数据放在ch数组
     * start：表从哪开始是SAX读取的内容、
     * length表长度*/
    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();
    }

}

//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;
    }
}

结果如下：但没有打印 ````````end````````的？？？？？？
04-10 11:07:37.103: I/System.out(835): Mark male manager

Guangdong

8000 Merry female employee

Shanghai

4000 Tom male Manger

Beijing

1000000
04-10 11:07:42.133: I/System.out(835): ````````begin````````
04-10 11:07:46.253: I/System.out(835): id=AQ01
04-10 11:07:46.947: I/System.out(835): name: Mark
04-10 11:07:46.947: I/System.out(835): sex: male
04-10 11:07:46.952: I/System.out(835): status: manager
04-10 11:07:46.976: I/System.out(835): address: Guangdong
04-10 11:07:46.981: I/System.out(835): money: 8000
04-10 11:07:47.002: I/System.out(835): id=AQ02
04-10 11:07:47.002: I/System.out(835): name: Merry
04-10 11:07:47.002: I/System.out(835): sex: female
04-10 11:07:47.025: I/System.out(835): status: employee
04-10 11:07:47.025: I/System.out(835): address: Shanghai
04-10 11:07:47.045: I/System.out(835): money: 4000
04-10 11:07:47.045: I/System.out(835): id=AQ03
04-10 11:07:47.106: I/System.out(835): name: Tom
04-10 11:07:47.106: I/System.out(835): sex: male
04-10 11:07:47.112: I/System.out(835): status: Manger
04-10 11:07:47.149: I/System.out(835): address: Beijing
04-10 11:07:47.149: I/System.out(835): money: 1000000