Android学习笔记(二十一)

在上获取资源

org.wp.activity

GetXmlTest

Java代码

package org.wp.activity;

import java.net.URLEncoder;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import org.wp.domain.Resource;
import org.wp.net.utils.NetTool;
import org.wp.net.utils.SaxTool;
import android.os.Environment;
import android.test.AndroidTestCase;
import android.util.Log;

public class GetXmlTest extends AndroidTestCase {

    private static final String TAG = "GetXmlTest";

    public void testGetXml() throws Exception {
        // 如果参数是中文必须进行Url编码
        // URLEncoder.encode("http://", "UTF-8");
        String path = "";
        String xml = NetTool.getTextContent(path, "UTF-8");
        FileOutputStream outputStream = new FileOutputStream(new File(
                Environment.getExternalStorageDirectory(), "test.xml"));
        OutputStreamWriter writer = new OutputStreamWriter(outputStream,
                "UTF-8");
        writer.write(xml);
        writer.flush();
        writer.close();
        outputStream.close();
        Log.i(TAG, xml);
    }

    public void testGetXmlAndParser1() throws Exception {
        String path = "";
        String xml = NetTool.getTextContent(path, "UTF-8");
        InputStream inputStream = new ByteArrayInputStream(xml.getBytes());
        Resource resource = SaxTool.readXml(inputStream);
        Log.i(TAG, resource.toString());
    }

    public void testGetXmlAndParser2() throws Exception {
        String path = "";
        InputStream inputStream = NetTool.getContent(path, "UTF-8");
        if (inputStream != null) {
            Resource resource = SaxTool.readXml(inputStream);
            Log.i(TAG, resource.toString());
        } else {
            Log.i(TAG, "get url content error");
        }
    }
}

org.wp.net.utils

NetTool

Java代码

package org.wp.net.utils;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class NetTool {

    public static InputStream getContent(String urlpath, String encoding)
            throws Exception {
        URL url = new URL(urlpath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(6 * 1000);
        if (conn.getResponseCode() == 200) {
            return conn.getInputStream();
        }
        return null;
    }

    public static String getTextContent(String urlpath, String encoding)
            throws Exception {
        URL url = new URL(urlpath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(6 * 1000);
        if (conn.getResponseCode() == 200) {
            InputStream inputStream = conn.getInputStream();
            byte[] data = readStream(inputStream);
            return new String(data, encoding);
        }
        return null;
    }

    public static byte[] readStream(InputStream inputStream) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while ((len = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, len);
        }
        outputStream.close();
        inputStream.close();
        return outputStream.toByteArray();
    }
}

SaxTool

Java代码

package org.wp.net.utils;

import java.io.InputStream;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.wp.domain.Resource;

public class SaxTool {

    public static Resource readXml(InputStream inStream) throws Exception {

        // 得到SAX解析器的工厂实例
        SAXParserFactory spf = SAXParserFactory.newInstance();
        // 从SAX工厂实例中获得SAX解析器
        SAXParser saxParser = spf.newSAXParser();

        XMLContentHandler handler = new XMLContentHandler();
        saxParser.parse(inStream, handler);
        inStream.close();
        return handler.getResource();
    }
}

XMLContentHandler

Java代码

package org.wp.net.utils;

import java.util.ArrayList;
import org.wp.domain.Item;
import org.wp.domain.Resource;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class XMLContentHandler extends DefaultHandler {

    private Resource resource;

    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        if ("R".equals(localName)) {
            resource = new Resource(attributes.getValue("", "CN"), attributes
                    .getValue("", "P"));
            resource.setItems(new ArrayList<Item>());
        } else if ("I".equals(localName) && resource != null) {
            resource.getItems().add(
                    new Item(new Integer(attributes.getValue("", "ID")),
                            attributes.getValue("", "N"), attributes.getValue(
                                    "", "CN")));
        }
    }

    public Resource getResource() {
        return resource;
    }
}

org.wp.domain

Item

Java代码

package org.wp.domain;

public class Item {
    private Integer id;
    private String name;
    private String cn;

    public Item() {

    }

    public Item(Integer id, String name, String cn) {
        this.id = id;
        this.name = name;
        this.cn = cn;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCn() {
        return cn;
    }

    public void setCn(String cn) {
        this.cn = cn;
    }
}

Resource

Java代码

package org.wp.domain;

import java.util.List;

public class Resource {
    private String cn;
    private String p;
    private List<Item> items;

    public Resource() {

    }

    public Resource(String cn, String p) {
        this.cn = cn;
        this.p = p;
    }

    public String getCn() {
        return cn;
    }

    public void setCn(String cn) {
        this.cn = cn;
    }

    public String getP() {
        return p;
    }

    public void setP(String p) {
        this.p = p;
    }

    public List<Item> getItems() {
        return items;
    }

    public void setItems(List<Item> items) {
        this.items = items;
    }

    @Override
    public String toString() {
        return "cn=" + cn + ",p=" + p;
    }
}

AndroidManifest.

代码

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android=""
    package="org.wp.activity" android:versionCode="1" android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <uses-library android:name="android.test.runner" />
        <activity android:name=".XmlActivity" 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="7" />
    <uses-permission android:name="android.permission.INTERNET" />
    <!-- 在SDCard中创建与删除文件权限 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
    <!-- 往SDCard中写入数据权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <instrumentation android:name="android.test.InstrumentationTestRunner"
        android:targetPackage="org.wp.activity" android:label="Tests for My App" />
</manifest>