Android学习第十七天----从网络上获取xml

利用pull解析，将获取到的xml显示在页面中。

package com.will.entity;

public class Books {
    private Integer bookId;
    private String bookName;
    private float bookPrice;
    
    public Books() {
        super();
    }
    public Integer getBookId() {
        return bookId;
    }
    public void setBookId(Integer bookId) {
        this.bookId = bookId;
    }
    public String getBookName() {
        return bookName;
    }
    public void setBookName(String bookName) {
        this.bookName = bookName;
    }
    public float getBookPrice() {
        return bookPrice;
    }
    public void setBookPrice(float bookPrice) {
        this.bookPrice = bookPrice;
    }
    @Override
    public String toString() {
        return "Books [bookId=" + bookId + ", bookName=" + bookName
                + ", bookPrice=" + bookPrice + "]";
    }
    
}

创建对象的实体类，然后创建服务类，

package com.will.service;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

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

import android.util.Xml;

import com.will.entity.Books;

public class XmlService_1 {
    public static List<Books> getList(String path) throws IOException, XmlPullParserException {
    InputStream is = null;
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setReadTimeout(5 * 1000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode() == 200) {
        is = conn.getInputStream();
        }
    return XmlParse(is);
    }

    public static List<Books> XmlParse(InputStream is) throws IOException, XmlPullParserException {
    List<Books> list = null;
    Books book = null;
    XmlPullParser xpp = Xml.newPullParser();
    
        xpp.setInput(is, "utf-8");
        int eventType = xpp.getEventType();
        while (eventType != XmlPullParser.END_DOCUMENT) {
        switch (eventType) {
        case XmlPullParser.START_DOCUMENT:
            list = new ArrayList<Books>();
            break;
        case XmlPullParser.START_TAG:
            if ("book".equals(xpp.getName())) {
            book = new Books();
             book.setBookId(Integer.parseInt(xpp.getAttributeValue(0)));
            }
            if ("name".equals(xpp.getName())) {
            book.setBookName(xpp.nextText());
            }
            if ("price".equals(xpp.getName())) {
            book.setBookPrice(Float.parseFloat(xpp.nextText()));
            }
            break;
        case XmlPullParser.END_TAG:
            if ("book".equals(xpp.getName())) {
            list.add(book);
            }
            break;
        default:
            break;
        }
        eventType = xpp.next();
        }
        is.close();
    return list;

    }
    public static void saveXML(List<Books> list,OutputStream output)
    {
    XmlSerializer serializer = Xml.newSerializer();
    try {
        serializer.setOutput(output, "utf-8");
        serializer.startDocument("UTF-8", true);
        serializer.startTag(null, "books");

        for (Books book : list) {
            serializer.startTag(null, "book");
            serializer.attribute(null, "id", book.getBookId().toString());

            serializer.startTag(null, "name");
            serializer.text(book.getBookName());
            serializer.endTag(null, "name");

            serializer.startTag(null, "price");
            serializer.text(String.valueOf(book.getBookPrice()));
            serializer.endTag(null, "price");

            serializer.endTag(null, "book");
        }
        serializer.endTag(null, "books");
        serializer.endDocument();
        output.flush();
        output.close();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    }
}

在main中

package com.example.httpxml;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.xmlpull.v1.XmlPullParserException;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import com.will.entity.Books;
import com.will.service.XmlService_1;

public class MainActivity extends ListActivity {

    private List<Books> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    try {
        list = XmlService_1
            .getList("http://192.168.1.20:8080/javawebxml/XMLServlet");
        File file = new File(MainActivity.this.getFilesDir()
            .getAbsolutePath() + "/books.xml");
        FileOutputStream fos = new FileOutputStream(file);
        XmlService_1.saveXML(list, fos);
        MainActivity.this.setListAdapter(new ArrayAdapter<Books>(
            MainActivity.this, android.R.layout.simple_list_item_1,
            list));
    } catch (IOException e) {
        e.printStackTrace();
    } catch (XmlPullParserException e) {
        e.printStackTrace();
    }
    }
}