Android(安卓)网络多线程断点下载
16lz
2021-12-04
Android 网络多线程断点下载
1.创建Android工程 www.AFITY.com
Project name:MulThreadDownloader
www.AFITY.comBuildTarget:Android2.1
www.AFITY.comApplication name：多线程断点下载 www.AFITY.com
Package name:com.changcheng.download
www.AFITY.comCreate Activity:MulThreadDownloader
www.AFITY.comMin SDK Version:7
2.AndroidManifest.xml www.AFITY.com <?xml version="1.0" encoding="utf-8"?> www.AFITY.com <manifest xmlns:android="http://schemas.android.com/apk/res/android" www.AFITY.com package="com.changcheng.download" www.AFITY.com android:versionCode="1" www.AFITY.com android:versionName="1.0"> www.AFITY.com <application android:icon="@drawable/icon" android:label="@string/app_name"> www.AFITY.com <activity android:name=".MulThreadDownloader" www.AFITY.com android:label="@string/app_name"> www.AFITY.com <intent-filter> www.AFITY.com <action android:name="android.intent.action.MAIN" /> www.AFITY.com <category android:name="android.intent.category.LAUNCHER" /> www.AFITY.com </intent-filter> www.AFITY.com </activity> www.AFITY.com </application> www.AFITY.com <uses-sdk android:minSdkVersion="7" /> www.AFITY.com <!-- 在SDCard中创建与删除文件权限 --> www.AFITY.com <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> www.AFITY.com <!-- 往SDCard写入数据权限 --> www.AFITY.com <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> www.AFITY.com <!-- 访问internet权限 --> www.AFITY.com <uses-permission android:name="android.permission.INTERNET"/> www.AFITY.com</manifest> www.AFITY.com
3.strings.xml www.AFITY.com<?xml version="1.0" encoding="utf-8"?> www.AFITY.com<resources> www.AFITY.com <string name="hello">Hello World, DownloadActivity!</string> www.AFITY.com <string name="app_name">多线程断点下载</string> www.AFITY.com <string name="path">下载路径</string> www.AFITY.com <string name="downloadbutton">下载</string> www.AFITY.com <string name="sdcarderror">SDCard不存在或者写保护</string> www.AFITY.com</resources>
4.main.xml www.AFITY.com <?xml version="1.0" encoding="utf-8"?> www.AFITY.com<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" www.AFITY.com android:orientation="vertical" www.AFITY.com android:layout_width="fill_parent" www.AFITY.com android:layout_height="fill_parent" www.AFITY.com > www.AFITY.com <!-- 下载路径 --> www.AFITY.com <TextView www.AFITY.com android:layout_width="fill_parent" www.AFITY.com android:layout_height="wrap_content" www.AFITY.com android:text="@string/path" www.AFITY.com /> www.AFITY.com <EditText www.AFITY.com android:layout_width="fill_parent" www.AFITY.com android:layout_height="wrap_content" www.AFITY.com android:text="http://www.winrar.com.cn/download/wrar380sc.exe" www.AFITY.com android:id="@+id/path" www.AFITY.com /> www.AFITY.com <!-- 下载按钮 --> www.AFITY.com <Button www.AFITY.com android:layout_width="wrap_content" www.AFITY.com android:layout_height="wrap_content" www.AFITY.com android:text="@string/downloadbutton" www.AFITY.com android:id="@+id/button" www.AFITY.com /> www.AFITY.com <!-- 进度条 --> www.AFITY.com <ProgressBar www.AFITY.com android:layout_width="fill_parent" www.AFITY.com android:layout_height="20dip" www.AFITY.com style="?android:attr/progressBarStyleHorizontal" www.AFITY.com android:id="@+id/downloadbar"/> www.AFITY.com <!-- 进度% --> www.AFITY.com <TextView www.AFITY.com android:layout_width="fill_parent" www.AFITY.com android:layout_height="wrap_content" www.AFITY.com android:gravity="center" www.AFITY.com android:id="@+id/resultView" www.AFITY.com /> www.AFITY.com </LinearLayout>
5.MulThreadDownloader www.AFITY.compackage com.changcheng.download; www.AFITY.com www.AFITY.comimport java.io.File; www.AFITY.comimport com.changcheng.net.download.DownloadProgressListener; www.AFITY.comimport com.changcheng.net.download.FileDownloader; www.AFITY.com import com.changcheng.download.R; www.AFITY.comimport android.app.Activity; www.AFITY.comimport android.os.Bundle; www.AFITY.comimport android.os.Environment; www.AFITY.comimport android.os.Handler; www.AFITY.comimport android.os.Message; www.AFITY.comimport android.view.View; www.AFITY.comimport android.widget.Button; www.AFITY.com import android.widget.EditText; www.AFITY.comimport android.widget.ProgressBar; www.AFITY.com import android.widget.TextView; www.AFITY.comimport android.widget.Toast; www.AFITY.com www.AFITY.com public class MulThreadDownloader extends Activity { www.AFITY.com private EditText pathText; www.AFITY.com private ProgressBar progressBar; www.AFITY.com private TextView resultView; www.AFITY.com private Handler handler = new Handler(){ www.AFITY.com @Override www.AFITY.com public void handleMessage(Message msg) { www.AFITY.com if(!Thread.currentThread().isInterrupted()){ www.AFITY.com switch (msg.what) { www.AFITY.com case 1: www.AFITY.com // 获取当前文件下载的进度 www.AFITY.com int size = msg.getData().getInt("size"); www.AFITY.com progressBar.setProgress(size); www.AFITY.com int result = (int)(((float)size/(float)progressBar.getMax()) * 100); www.AFITY.com resultView.setText(result+ "%"); www.AFITY.com if(progressBar.getMax() == size){ www.AFITY.com Toast.makeText(MulThreadDownloader.this, "文件下载完成", 1).show(); www.AFITY.com } www.AFITY.com break; www.AFITY.com www.AFITY.com case -1: www.AFITY.com String error = msg.getData().getString("error"); www.AFITY.com Toast.makeText(MulThreadDownloader.this, error, 1).show(); www.AFITY.com break; www.AFITY.com } www.AFITY.com } www.AFITY.com super.handleMessage(msg); www.AFITY.com } www.AFITY.com }; www.AFITY.com www.AFITY.com @Override www.AFITY.com public void onCreate(Bundle savedInstanceState) { www.AFITY.com super.onCreate(savedInstanceState); www.AFITY.com setContentView(R.layout.main); www.AFITY.com pathText = (EditText)this.findViewById(R.id.path); www.AFITY.com progressBar = (ProgressBar)this.findViewById(R.id.downloadbar); www.AFITY.com resultView = (TextView)this.findViewById(R.id.resultView); www.AFITY.com Button button = (Button)this.findViewById(R.id.button); www.AFITY.com button.setOnClickListener(new View.OnClickListener() { www.AFITY.com @Override www.AFITY.com public void onClick(View v) { www.AFITY.com String path = pathText.getText().toString(); www.AFITY.com if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ www.AFITY.com //下载文件需要很长的时间，主线程是不能够长时间被阻塞，如果主线程被长时间阻塞， 那么Android被回收应用 www.AFITY.com download(path, Environment.getExternalStorageDirectory()); www.AFITY.com }else{ www.AFITY.com Toast.makeText(MulThreadDownloader.this, R.string.sdcarderror, 1).show(); www.AFITY.com } www.AFITY.com } www.AFITY.com }); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 下载文件 www.AFITY.com * @param path 下载路径 www.AFITY.com * @param saveDir 文件保存目录 www.AFITY.com */ www.AFITY.com //对于Android的UI控件，只能由主线程负责显示界面的更新，其他线程不能直接更新UI控件的显示 www.AFITY.com public void download(final String path, final File saveDir){ www.AFITY.com new Thread(new Runnable() { www.AFITY.com @Override www.AFITY.com public void run() { www.AFITY.com FileDownloader downer = newFileDownloader(MulThreadDownloader.this, path, saveDir, 3); www.AFITY.com progressBar.setMax(downer.getFileSize());//设置进度条的最大刻度 www.AFITY.com try { www.AFITY.com downer.download(new DownloadProgressListener(){ www.AFITY.com @Override www.AFITY.com public void onDownloadSize(int size) { www.AFITY.com Message msg = new Message(); www.AFITY.com msg.what = 1; www.AFITY.com msg.getData().putInt("size", size); www.AFITY.com handler.sendMessage(msg);//发送消息 www.AFITY.com }}); www.AFITY.com } catch (Exception e) { www.AFITY.com Message msg = new Message(); www.AFITY.com msg.what = -1; www.AFITY.com msg.getData().putString("error", "下载失败"); www.AFITY.com handler.sendMessage(msg); www.AFITY.com } www.AFITY.com } www.AFITY.com }).start(); www.AFITY.com } www.AFITY.com} www.AFITY.com www.AFITY.com 6.FileDownload www.AFITY.com package com.changcheng.net.download; www.AFITY.com www.AFITY.com import java.io.File; www.AFITY.com import java.io.RandomAccessFile; www.AFITY.com import java.net.HttpURLConnection; www.AFITY.comimport java.net.URL; www.AFITY.com import java.util.LinkedHashMap; www.AFITY.com import java.util.Map; www.AFITY.com import java.util.UUID; www.AFITY.com import java.util.concurrent.ConcurrentHashMap; www.AFITY.comimport java.util.regex.Matcher; www.AFITY.com import java.util.regex.Pattern; www.AFITY.com import com.changcheng.download.service.FileService; www.AFITY.comimport android.content.Context; www.AFITY.comimport android.util.Log; www.AFITY.com www.AFITY.com /** www.AFITY.com * 文件下载器 www.AFITY.com * @author lihuoming@sohu.com www.AFITY.com * www.AFITY.com */ www.AFITY.com public class FileDownloader { www.AFITY.com private Context context; www.AFITY.com private FileService fileService; www.AFITY.com www.AFITY.com private static final String TAG = "FileDownloader"; www.AFITY.com /* 已下载文件大小 */ www.AFITY.com private int downloadSize = 0; www.AFITY.com /* 原始文件大小 */ www.AFITY.com private int fileSize = 0; www.AFITY.com /* 线程数 */ www.AFITY.com private DownloadThread[] threads; www.AFITY.com /* 下载路径 */ www.AFITY.com private URL url; www.AFITY.com /* 本地保存文件 */ www.AFITY.com private File saveFile; www.AFITY.com /* 下载记录文件 */ www.AFITY.com private File logFile; www.AFITY.com /* 缓存各线程最后下载的位置*/ www.AFITY.com private Map<Integer, Integer> data = new ConcurrentHashMap<Integer, Integer>(); www.AFITY.com /* 每条线程下载的大小 */ www.AFITY.com private int block; www.AFITY.com private String downloadUrl;//下载路径 www.AFITY.com /** www.AFITY.com * 获取线程数 www.AFITY.com */ www.AFITY.com public int getThreadSize() { www.AFITY.com return threads.length; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 获取文件大小 www.AFITY.com * @return www.AFITY.com */ www.AFITY.com public int getFileSize() { www.AFITY.com return fileSize; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 累计已下载大小 www.AFITY.com * @param size www.AFITY.com */ www.AFITY.com protected synchronized void append(int size) { www.AFITY.com downloadSize += size; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 更新指定线程最后下载的位置 www.AFITY.com * @param threadId 线程id www.AFITY.com * @param pos 最后下载的位置 www.AFITY.com */ www.AFITY.com protected void update(int threadId, int pos) { www.AFITY.com this.data.put(threadId, pos); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 保存记录文件 www.AFITY.com */ www.AFITY.com protected synchronized void saveLogFile() { www.AFITY.com this.fileService.update(this.downloadUrl, this.data); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 构建文件下载器 www.AFITY.com * @param downloadUrl 下载路径 www.AFITY.com * @param fileSaveDir 文件保存目录 www.AFITY.com * @param threadNum 下载线程数 www.AFITY.com */ www.AFITY.com public FileDownloader(Context context, String downloadUrl, File fileSaveDir, int threadNum) { www.AFITY.com try { www.AFITY.com this.context = context; www.AFITY.com this.downloadUrl = downloadUrl; www.AFITY.com fileService = new FileService(context); www.AFITY.com this.url = new URL(downloadUrl); www.AFITY.com if(!fileSaveDir.exists()) fileSaveDir.mkdirs(); www.AFITY.com this.threads = new DownloadThread[threadNum]; www.AFITY.com HttpURLConnection conn = (HttpURLConnection) url.openConnection(); www.AFITY.com conn.setConnectTimeout(6*1000); www.AFITY.com conn.setRequestMethod("GET"); www.AFITY.com conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*"); www.AFITY.com conn.setRequestProperty("Accept-Language", "zh-CN"); www.AFITY.com conn.setRequestProperty("Referer", downloadUrl); www.AFITY.com conn.setRequestProperty("Charset", "UTF-8"); www.AFITY.com conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"); www.AFITY.com conn.setRequestProperty("Connection", "Keep-Alive"); www.AFITY.com conn.connect(); www.AFITY.com printResponseHeader(conn); www.AFITY.com if (conn.getResponseCode()==200) { www.AFITY.com this.fileSize = conn.getContentLength();//根据响应获取文件大小 www.AFITY.com if (this.fileSize <= 0) throw new RuntimeException("无法获知文件大小 "); www.AFITY.com www.AFITY.com String filename = getFileName(conn); www.AFITY.com this.saveFile = new File(fileSaveDir, filename);/* 保存文件 */ www.AFITY.com Map<Integer, Integer> logdata = fileService.getData(downloadUrl); www.AFITY.com if(logdata.size()>0){ www.AFITY.com data.putAll(logdata); www.AFITY.com } www.AFITY.com this.block = this.fileSize / this.threads.length + 1; www.AFITY.com if(this.data.size()==this.threads.length){ www.AFITY.com for (int i = 0; i < this.threads.length; i++) { www.AFITY.com this.downloadSize += this.data.get(i+1)-(this.block * i); www.AFITY.com } www.AFITY.com print("已经下载的长度"+ this.downloadSize); www.AFITY.com } www.AFITY.com }else{ www.AFITY.com throw new RuntimeException("服务器响应错误 "); www.AFITY.com } www.AFITY.com } catch (Exception e) { www.AFITY.com print(e.toString()); www.AFITY.com throw new RuntimeException("连接不到下载路径 "); www.AFITY.com } www.AFITY.com } www.AFITY.com /** www.AFITY.com * 获取文件名 www.AFITY.com */ www.AFITY.com private String getFileName(HttpURLConnection conn) { www.AFITY.com String filename = this.url.toString().substring(this.url.toString().lastIndexOf('/') + 1); www.AFITY.com if(filename==null || "".equals(filename.trim())){//如果获取不到文件名称 www.AFITY.com for (int i = 0;; i++) { www.AFITY.com String mine = conn.getHeaderField(i); www.AFITY.com if (mine == null) break; www.AFITY.com if("content-disposition".equals(conn.getHeaderFieldKey(i).toLowerCase())){ www.AFITY.com Matcher m = Pattern.compile(".*filename=(.*)").matcher(mine.toLowerCase()); www.AFITY.com if(m.find()) return m.group(1); www.AFITY.com } www.AFITY.com } www.AFITY.com filename = UUID.randomUUID()+ ".tmp";//默认取一个文件名 www.AFITY.com } www.AFITY.com return filename; www.AFITY.com } www.AFITY.com www.AFITY.com /** www.AFITY.com * 开始下载文件 www.AFITY.com * @param listener 监听下载数量的变化,如果不需要了解实时下载的数量,可以设置为null www.AFITY.com * @return 已下载文件大小 www.AFITY.com * @throws Exception www.AFITY.com */ www.AFITY.com public int download(DownloadProgressListener listener) throws Exception{ www.AFITY.com try { www.AFITY.com if(this.data.size() != this.threads.length){ www.AFITY.com this.data.clear(); www.AFITY.com for (int i = 0; i < this.threads.length; i++) { www.AFITY.com this.data.put(i+1, this.block * i); www.AFITY.com } www.AFITY.com } www.AFITY.com for (int i = 0; i < this.threads.length; i++) { www.AFITY.com int downLength = this.data.get(i+1) - (this.block * i); www.AFITY.com if(downLength < this.block && this.data.get(i+1)<this.fileSize){ //该线程未完成下载时,继续下载 www.AFITY.com RandomAccessFile randOut = newRandomAccessFile(this.saveFile, "rw"); www.AFITY.com if(this.fileSize>0) randOut.setLength(this.fileSize); www.AFITY.com randOut.seek(this.data.get(i+1)); www.AFITY.com this.threads[i] = new DownloadThread(this, this.url, randOut,this.block, this.data.get(i+1), i+1); www.AFITY.com this.threads[i].setPriority(7); www.AFITY.com this.threads[i].start(); www.AFITY.com }else{ www.AFITY.com this.threads[i] = null; www.AFITY.com } www.AFITY.com } www.AFITY.com this.fileService.save(this.downloadUrl, this.data); www.AFITY.com boolean notFinish = true;//下载未完成 www.AFITY.com while (notFinish) {// 循环判断是否下载完毕 www.AFITY.com Thread.sleep(900); www.AFITY.com notFinish = false;//假定下载完成 www.AFITY.com for (int i = 0; i < this.threads.length; i++){ www.AFITY.com if (this.threads[i] != null && !this.threads[i].isFinish()) { www.AFITY.com notFinish = true;//下载没有完成 www.AFITY.com if(this.threads[i].getDownLength() == -1){//如果下载失败,再重新下载 www.AFITY.com RandomAccessFile randOut = newRandomAccessFile(this.saveFile, "rw"); www.AFITY.com randOut.seek(this.data.get(i+1)); www.AFITY.com this.threads[i] = new DownloadThread(this, this.url, randOut, this.block, this.data.get(i+1), i+1); www.AFITY.com this.threads[i].setPriority(7); www.AFITY.com this.threads[i].start(); www.AFITY.com } www.AFITY.com } www.AFITY.com } www.AFITY.com if(listener!=null) listener.onDownloadSize(this.downloadSize); www.AFITY.com } www.AFITY.com fileService.delete(this.downloadUrl); www.AFITY.com } catch (Exception e) { www.AFITY.com print(e.toString()); www.AFITY.com throw new Exception("下载失败"); www.AFITY.com } www.AFITY.com return this.downloadSize; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 获取Http响应头字段 www.AFITY.com * @param http www.AFITY.com * @return www.AFITY.com */ www.AFITY.com public static Map<String, String> getHttpResponseHeader(HttpURLConnection http) { www.AFITY.com Map<String, String> header = new LinkedHashMap<String, String>(); www.AFITY.com for (int i = 0;; i++) { www.AFITY.com String mine = http.getHeaderField(i); www.AFITY.com if (mine == null) break; www.AFITY.com header.put(http.getHeaderFieldKey(i), mine); www.AFITY.com } www.AFITY.com return header; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 打印Http头字段 www.AFITY.com * @param http www.AFITY.com */ www.AFITY.com public static void printResponseHeader(HttpURLConnection http){ www.AFITY.com Map<String, String> header = getHttpResponseHeader(http); www.AFITY.com for(Map.Entry<String, String> entry : header.entrySet()){ www.AFITY.com String key = entry.getKey()!=null ? entry.getKey()+ ":" : ""; www.AFITY.com print(key+ entry.getValue()); www.AFITY.com } www.AFITY.com } www.AFITY.com www.AFITY.com private static void print(String msg){ www.AFITY.com Log.i(TAG, msg); www.AFITY.com } www.AFITY.com} www.AFITY.com www.AFITY.com 7.DownloadProgressListener www.AFITY.compackage com.changcheng.net.download; www.AFITY.com www.AFITY.com public interface DownloadProgressListener { www.AFITY.com public void onDownloadSize(int size); www.AFITY.com} www.AFITY.com www.AFITY.com 8.FileService www.AFITY.compackage com.changcheng.download.service; www.AFITY.com www.AFITY.comimport java.util.HashMap; www.AFITY.com import java.util.Map; www.AFITY.com import android.content.Context; www.AFITY.comimport android.database.Cursor; www.AFITY.com import android.database.sqlite.SQLiteDatabase; www.AFITY.com www.AFITY.com/** www.AFITY.com * 业务bean www.AFITY.com * www.AFITY.com */ www.AFITY.compublic class FileService { www.AFITY.com private DBOpenHelper openHelper; www.AFITY.com www.AFITY.com public FileService(Context context) { www.AFITY.com openHelper = new DBOpenHelper(context); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 获取线程最后下载位置 www.AFITY.com * @param path www.AFITY.com * @return www.AFITY.com */ www.AFITY.com public Map<Integer, Integer> getData(String path){ www.AFITY.com SQLiteDatabase db = openHelper.getReadableDatabase(); www.AFITY.com Cursor cursor = db.rawQuery("select threadid, position from filedown where downpath=?", new String[]{path}); www.AFITY.com Map<Integer, Integer> data = new HashMap<Integer, Integer>(); www.AFITY.com while(cursor.moveToNext()){ www.AFITY.com data.put(cursor.getInt(0), cursor.getInt(1)); www.AFITY.com } www.AFITY.com cursor.close(); www.AFITY.com db.close(); www.AFITY.com return data; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 保存下载线程初始位置 www.AFITY.com * @param path www.AFITY.com * @param map www.AFITY.com */ www.AFITY.com public void save(String path, Map<Integer, Integer> map){//int threadid, int position www.AFITY.com SQLiteDatabase db = openHelper.getWritableDatabase(); www.AFITY.com db.beginTransaction(); www.AFITY.com try{ www.AFITY.com for(Map.Entry<Integer, Integer> entry : map.entrySet()){ www.AFITY.com db.execSQL("insert into filedown(downpath, threadid, position) values(?,?,?)", www.AFITY.com new Object[]{path, entry.getKey(), entry.getValue()}); www.AFITY.com } www.AFITY.com db.setTransactionSuccessful(); www.AFITY.com }finally{ www.AFITY.com db.endTransaction(); www.AFITY.com } www.AFITY.com db.close(); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 实时更新线程的最后下载位置 www.AFITY.com * @param path www.AFITY.com * @param map www.AFITY.com */ www.AFITY.com public void update(String path, Map<Integer, Integer> map){ www.AFITY.com SQLiteDatabase db = openHelper.getWritableDatabase(); www.AFITY.com db.beginTransaction(); www.AFITY.com try{ www.AFITY.com for(Map.Entry<Integer, Integer> entry : map.entrySet()){ www.AFITY.com db.execSQL("update filedown set position=? where downpath=? and threadid=?", www.AFITY.com new Object[]{entry.getValue(), path, entry.getKey()}); www.AFITY.com } www.AFITY.com db.setTransactionSuccessful(); www.AFITY.com }finally{ www.AFITY.com db.endTransaction(); www.AFITY.com } www.AFITY.com db.close(); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 当文件下载完成后，清掉该文件对应的下载记录 www.AFITY.com * @param path www.AFITY.com */ www.AFITY.com public void delete(String path){ www.AFITY.com SQLiteDatabase db = openHelper.getWritableDatabase(); www.AFITY.com db.execSQL("delete from filedown where downpath=?", new Object[]{path}); www.AFITY.com db.close(); www.AFITY.com } www.AFITY.com www.AFITY.com } www.AFITY.com www.AFITY.com 9.DownloadThread www.AFITY.compackage com.changcheng.net.download; www.AFITY.com www.AFITY.comimport java.io.InputStream; www.AFITY.com import java.io.RandomAccessFile; www.AFITY.comimport java.net.HttpURLConnection; www.AFITY.com import java.net.URL; www.AFITY.com import android.util.Log; www.AFITY.com www.AFITY.compublic class DownloadThread extends Thread { www.AFITY.com private static final String TAG = "DownloadThread"; www.AFITY.com private RandomAccessFile saveFile; www.AFITY.com private URL downUrl; www.AFITY.com private int block; www.AFITY.com /* 下载开始位置 */ www.AFITY.com private int threadId = -1; www.AFITY.com private int startPos; www.AFITY.com private int downLength; www.AFITY.com private boolean finish = false; www.AFITY.com private FileDownloader downloader; www.AFITY.com www.AFITY.com public DownloadThread(FileDownloader downloader, URL downUrl, RandomAccessFile saveFile, int block, int startPos, int threadId) { www.AFITY.com this.downUrl = downUrl; www.AFITY.com this.saveFile = saveFile; www.AFITY.com this.block = block; www.AFITY.com this.startPos = startPos; www.AFITY.com this.downloader = downloader; www.AFITY.com this.threadId = threadId; www.AFITY.com this.downLength = startPos - (block * (threadId - 1)); www.AFITY.com } www.AFITY.com www.AFITY.com @Override www.AFITY.com public void run() { www.AFITY.com if(downLength < block){//未下载完成 www.AFITY.com try { www.AFITY.com HttpURLConnection http = (HttpURLConnection)downUrl.openConnection(); www.AFITY.com http.setRequestMethod("GET"); www.AFITY.com http.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*"); www.AFITY.com http.setRequestProperty("Accept-Language", "zh-CN"); www.AFITY.com http.setRequestProperty("Referer", downUrl.toString()); www.AFITY.com http.setRequestProperty("Charset", "UTF-8"); www.AFITY.com http.setRequestProperty("Range", "bytes=" + this.startPos + "-"); www.AFITY.com http.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"); www.AFITY.com http.setRequestProperty("Connection", "Keep-Alive"); www.AFITY.com www.AFITY.com InputStream inStream = http.getInputStream(); www.AFITY.com int max = block>1024 ? 1024 : (block>10 ? 10 : 1); www.AFITY.com byte[] buffer = new byte[max]; www.AFITY.com int offset = 0; www.AFITY.com print("线程 " + this.threadId + "从位置"+ this.startPos+ "开始下载 "); www.AFITY.com while (downLength < block && (offset = inStream.read(buffer, 0, max)) != -1) { www.AFITY.com saveFile.write(buffer, 0, offset); www.AFITY.com downLength += offset; www.AFITY.com downloader.update(this.threadId, block * (threadId - 1) +downLength); www.AFITY.com downloader.saveLogFile(); www.AFITY.com downloader.append(offset); www.AFITY.com int spare = block-downLength;//求剩下的字节数 www.AFITY.com if(spare < max) max = (int) spare; www.AFITY.com } www.AFITY.com saveFile.close(); www.AFITY.com inStream.close(); www.AFITY.com print("线程 " + this.threadId + "完成下载 "); www.AFITY.com this.finish = true; www.AFITY.com this.interrupt(); www.AFITY.com } catch (Exception e) { www.AFITY.com this.downLength = -1; www.AFITY.com print("线程"+ this.threadId+ ":"+ e); www.AFITY.com } www.AFITY.com } www.AFITY.com } www.AFITY.com private static void print(String msg){ www.AFITY.com Log.i(TAG, msg); www.AFITY.com } www.AFITY.com /** www.AFITY.com * 下载是否完成 www.AFITY.com * @return www.AFITY.com */ www.AFITY.com public boolean isFinish() { www.AFITY.com return finish; www.AFITY.com } www.AFITY.com /** www.AFITY.com * 已经下载的内容大小 www.AFITY.com * @return 如果返回值为-1,代表下载失败 www.AFITY.com */ www.AFITY.com public long getDownLength() { www.AFITY.com return downLength; } } package com.changcheng.download.service; www.AFITY.com import android.content.Context; www.AFITY.com import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; www.AFITY.com public class DBOpenHelper extends SQLiteOpenHelper { private static final String DBNAME = "download.db"; private static final int VERSION = 2; www.AFITY.com public DBOpenHelper(Context context) { www.AFITY.com super(context, DBNAME, null, VERSION); www.AFITY.com } @Override www.AFITY.com public void onCreate(SQLiteDatabase db) { www.AFITY.com db.execSQL("CREATE TABLE IF NOT EXISTS filedown (id integer primary key autoincrement, downpath varchar(100), threadid INTEGER, position INTEGER)"); www.AFITY.com } www.AFITY.com www.AFITY.com @Override www.AFITY.com public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { www.AFITY.com db.execSQL("DROP TABLE IF EXISTS filedown"); www.AFITY.com onCreate(db); www.AFITY.com } }
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