Android多線程.斷點續傳下載

jopen 11年前發布 | 24K 次閱讀 Android Android開發移動開發
/**

@brief  主界面    
@author lixp
*/
public class HomeActivity extends Activity {
 private EditText downloadpathText;
 private TextView resultView;
 private ProgressBar progressBar;
/**

當Handler被創建會關聯到創建它的當前線程的消息隊列，該類用于往消息隊列發送消息
消息隊列中的消息由當前線程內部進行處理
使用Handler更新UI界面信息。
/
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
progressBar.setProgress(msg.getData().getInt("size"));
float num = (float)progressBar.getProgress()/(float)progressBar.getMax();
int result = (int)(num100);
resultView.setText(result+ "%");



//顯示下載成功信息
if(progressBar.getProgress()==progressBar.getMax()){
Toast.makeText(HomeActivity.this, R.string.success, 1).show();
}
break;
case -1:
//顯示下載錯誤信息
Toast.makeText(HomeActivity.this, R.string.error, 1).show();
break;
 }
 }
};

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    downloadpathText = (EditText) this.findViewById(R.id.path);
    progressBar = (ProgressBar) this.findViewById(R.id.downloadbar);
    resultView = (TextView) this.findViewById(R.id.resultView);

    Button button = (Button) this.findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
String path = downloadpathText.getText().toString();
System.out.println(Environment.getExternalStorageState()+"------"+Environment.MEDIA_MOUNTED);
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
//開始下載文件
download(path, Environment.getExternalStorageDirectory());
}else{
//顯示SDCard錯誤信息
Toast.makeText(HomeActivity.this, R.string.sdcarderror, 1).show();
}
}
});
}
/**

主線程(UI線程)
對于顯示控件的界面更新只是由UI線程負責，如果是在非UI線程更新控件的屬性值，更新后的顯示界面不會反映到屏幕上
如果想讓更新后的顯示界面反映到屏幕上，需要用Handler設置。
@param path   lixp
@param savedir
*/
private void download(final String path, final File savedir) {
new Thread(new Runnable() {
@Override
public void run() {
//開啟3個線程進行下載
FileDownloader loader = new FileDownloader(HomeActivity.this, path, savedir, 3);
progressBar.setMax(loader.getFileSize());//設置進度條的最大刻度為文件的長度

try {
loader.download(new DownloadProgressListener() {
@Override
public void onDownloadSize(int size) {//實時獲知文件已經下載的數據長度
Message msg = new Message();
msg.what = 1;
msg.getData().putInt("size", size);
handler.sendMessage(msg);//發送消息
}
});
} catch (Exception e) {
handler.obtainMessage(-1).sendToTarget();
}
}
}).start();
}
}
二.
/**

下載線程類
@author lixp
*/
public class DownloadThread extends Thread {
private static final String TAG = "DownloadThread";
private File saveFile;
private URL downUrl;
private int block;

/ 下載開始位置  /
private int threadId = -1;
private int downLength;
private boolean finish = false;
private FileDownloader downloader;
/**

@param downloader:下載器
@param downUrl:下載地址
@param saveFile:下載路徑
*/
public DownloadThread(FileDownloader downloader, URL downUrl, File saveFile, int block, int downLength, int threadId) {
this.downUrl = downUrl;
this.saveFile = saveFile;
this.block = block;
this.downloader = downloader;
this.threadId = threadId;
this.downLength = downLength;
}

@Override
public void run() {
if(downLength < block){//未下載完成
try {
//使用Get方式下載
HttpURLConnection http = (HttpURLConnection) downUrl.openConnection();
http.setConnectTimeout(5  1000);
http.setRequestMethod("GET");
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,/*");
http.setRequestProperty("Accept-Language", "zh-CN");
http.setRequestProperty("Referer", downUrl.toString()); 
http.setRequestProperty("Charset", "UTF-8");
int startPos = block  (threadId - 1) + downLength;//開始位置
int endPos = block  threadId -1;//結束位置
http.setRequestProperty("Range", "bytes=" + startPos + "-"+ endPos);//設置獲取實體數據的范圍
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)");
http.setRequestProperty("Connection", "Keep-Alive");
InputStream inStream = http.getInputStream();
byte[] buffer = new byte[1024];
int offset = 0;
print("Thread " + this.threadId + " start download from position "+ startPos);
RandomAccessFile threadfile = new RandomAccessFile(this.saveFile, "rwd");
threadfile.seek(startPos);
while ((offset = inStream.read(buffer, 0, 1024)) != -1) {
threadfile.write(buffer, 0, offset);
downLength += offset;
downloader.update(this.threadId, downLength);
downloader.append(offset);
}
threadfile.close();
inStream.close();
print("Thread " + this.threadId + " download finish");
this.finish = true;
} catch (Exception e) {
this.downLength = -1;
print("Thread "+ this.threadId+ ":"+ e);
}
}
}
/**

下載是否完成
*/
public boolean isFinish() {
return finish;
}

/**

已經下載的內容大小
@return 如果返回值為-1,代表下載失敗
*/
public long getDownLength() {
return downLength;
}
}

三.//lixp
public class FileDownloader {
private static final String TAG = "FileDownloader";
private Context context;
private FileService fileService;
/ 已下載文件長度 /
private int downloadSize = 0;
/ 原始文件長度 /
private int fileSize = 0;
/ 線程數 /
private DownloadThread[] threads;
/ 本地保存文件 /
private File saveFile;
/ 緩存各線程下載的長度/
private Map<Integer, Integer> data = new ConcurrentHashMap<Integer, Integer>();
/ 每條線程下載的長度 /
private int block;
/ 下載路徑  /
private String downloadUrl;
/**

獲取線程數
*/
public int getThreadSize() {
return threads.length;
}
/**
獲取文件大小
@return
*/
public int getFileSize() {
return fileSize;
}

/**

累計已下載大小
@param size
*/
protected synchronized void append(int size) {
downloadSize += size;
}

/**

更新指定線程最后下載的位置
@param threadId 線程id
@param pos 最后下載的位置
*/
protected synchronized void update(int threadId, int pos) {
this.data.put(threadId, pos);
this.fileService.update(this.downloadUrl, this.data);
}

/**

構建文件下載器
@param downloadUrl 下載路徑
@param fileSaveDir 文件保存目錄
@param threadNum 下載線程數
*/
public FileDownloader(Context context, String downloadUrl, File fileSaveDir, int threadNum) {
try {
this.context = context;
this.downloadUrl = downloadUrl;
fileService = new FileService(this.context);
URL url = new URL(this.downloadUrl);
if(!fileSaveDir.exists()) fileSaveDir.mkdirs();
this.threads = new DownloadThread[threadNum];

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(51000);
conn.setRequestMethod("GET");
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,/*");
conn.setRequestProperty("Accept-Language", "zh-CN");
conn.setRequestProperty("Referer", downloadUrl); 
conn.setRequestProperty("Charset", "UTF-8");
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)");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.connect();
printResponseHeader(conn);
if (conn.getResponseCode()==200) {
this.fileSize = conn.getContentLength();//根據響應獲取文件大小
if (this.fileSize <= 0) throw new RuntimeException("Unkown file size ");
String filename = getFileName(conn);//獲取文件名稱
this.saveFile = new File(fileSaveDir, filename);//構建保存文件
Map<Integer, Integer> logdata = fileService.getData(downloadUrl);//獲取下載記錄
if(logdata.size()>0){//如果存在下載記錄
for(Map.Entry<Integer, Integer> entry : logdata.entrySet())
data.put(entry.getKey(), entry.getValue());//把各條線程已經下載的數據長度放入data中
}
if(this.data.size()==this.threads.length){//下面計算所有線程已經下載的數據長度
for (int i = 0; i < this.threads.length; i++) {
this.downloadSize += this.data.get(i+1);
}
print("已經下載的長度"+ this.downloadSize);
}
//計算每條線程下載的數據長度
this.block = (this.fileSize % this.threads.length)==0? this.fileSize / this.threads.length : this.fileSize / this.threads.length + 1;
}else{
throw new RuntimeException("server no response ");
}
} catch (Exception e) {
print(e.toString());
throw new RuntimeException("don't connection this url");
}
}
/**

獲取文件名
@param conn
@return
*/
private String getFileName(HttpURLConnection conn) {
String filename = this.downloadUrl.substring(this.downloadUrl.lastIndexOf('/') + 1);

if(filename==null || "".equals(filename.trim())){//如果獲取不到文件名稱
for (int i = 0;; i++) {
String mine = conn.getHeaderField(i);
if (mine == null) break;
if("content-disposition".equals(conn.getHeaderFieldKey(i).toLowerCase())){
Matcher m = Pattern.compile(".filename=(.)").matcher(mine.toLowerCase());
if(m.find()) return m.group(1);
}
}
filename = UUID.randomUUID()+ ".tmp";//默認取一個文件名
}
return filename;
}
/**

開始下載文件
@param listener 監聽下載數量的變化,如果不需要了解實時下載的數量,可以設置為null
@return 已下載文件大小
@throws Exception
*/
public int download(DownloadProgressListener listener) throws Exception{
try {
RandomAccessFile randOut = new RandomAccessFile(this.saveFile, "rw");
if(this.fileSize>0) randOut.setLength(this.fileSize);
randOut.close();
URL url = new URL(this.downloadUrl);

if(this.data.size() != this.threads.length){
this.data.clear();
for (int i = 0; i < this.threads.length; i++) {
this.data.put(i+1, 0);//初始化每條線程已經下載的數據長度為0
}
}
for (int i = 0; i < this.threads.length; i++) {//開啟線程進行下載
int downLength = this.data.get(i+1);
if(downLength < this.block && this.downloadSize<this.fileSize){//判斷線程是否已經完成下載,否則繼續下載
this.threads[i] = new DownloadThread(this, url, this.saveFile, this.block, this.data.get(i+1), i+1);
this.threads[i].setPriority(7);
this.threads[i].start();
}else{
this.threads[i] = null;
}
}
this.fileService.save(this.downloadUrl, this.data);
boolean notFinish = true;//下載未完成
while (notFinish) {// 循環判斷所有線程是否完成下載
Thread.sleep(900);
notFinish = false;//假定全部線程下載完成
for (int i = 0; i < this.threads.length; i++){
if (this.threads[i] != null && !this.threads[i].isFinish()) {//如果發現線程未完成下載
notFinish = true;//設置標志為下載沒有完成
if(this.threads[i].getDownLength() == -1){//如果下載失敗,再重新下載
this.threads[i] = new DownloadThread(this, url, this.saveFile, this.block, this.data.get(i+1), i+1);
this.threads[i].setPriority(7);
this.threads[i].start();
}
}
}
if(listener!=null) listener.onDownloadSize(this.downloadSize);//通知目前已經下載完成的數據長度
}
fileService.delete(this.downloadUrl);
} catch (Exception e) {
print(e.toString());
throw new Exception("file download fail");
}
return this.downloadSize;
}
/**

獲取Http響應頭字段
@param http
@return
*/
public static Map<String, String> getHttpResponseHeader(HttpURLConnection http) {
Map<String, String> header = new LinkedHashMap<String, String>();

for (int i = 0;; i++) {
String mine = http.getHeaderField(i);
if (mine == null) break;
header.put(http.getHeaderFieldKey(i), mine);
}
return header;
}
/**

打印Http頭字段
@param http
*/
public static void printResponseHeader(HttpURLConnection http){
Map<String, String> header = getHttpResponseHeader(http);

for(Map.Entry<String, String> entry : header.entrySet()){
String key = entry.getKey()!=null ? entry.getKey()+ ":" : "";
print(key+ entry.getValue());
}
}
/**

打印日志信息
@param msg
*/
private static void print(String msg){
Log.i(TAG, msg);
}
}

四.**

數據庫操作類
@author lixp
*/
public class DBOpenHelper extends SQLiteOpenHelper {
private static final String DBNAME = "down.db";
private static final int VERSION = 1;

/**

構造器
@param context
*/
public DBOpenHelper(Context context) {
super(context, DBNAME, null, VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE IF NOT EXISTS filedownlog (id integer primary key autoincrement, downpath varchar(100), threadid INTEGER, downlength INTEGER)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS filedownlog");
onCreate(db);
}
}
五.//下載工具類
public class FileService {
private DBOpenHelper openHelper;
public FileService(Context context) {
openHelper = new DBOpenHelper(context);
}
/**

獲取每條線程已經下載的文件長度
@param path
@return
*/
public Map<Integer, Integer> getData(String path){
SQLiteDatabase db = openHelper.getReadableDatabase();
Cursor cursor = db.rawQuery("select threadid, downlength from filedownlog where downpath=?", new String[]{path});
Map<Integer, Integer> data = new HashMap<Integer, Integer>();

while(cursor.moveToNext()){
data.put(cursor.getInt(0), cursor.getInt(1));
}
cursor.close();
db.close();
return data;
}
/**

保存每條線程已經下載的文件長度
@param path
@param map
*/
public void save(String path,  Map<Integer, Integer> map){//int threadid, int position
SQLiteDatabase db = openHelper.getWritableDatabase();
db.beginTransaction();

try{
for(Map.Entry<Integer, Integer> entry : map.entrySet()){
db.execSQL("insert into filedownlog(downpath, threadid, downlength) values(?,?,?)",
new Object[]{path, entry.getKey(), entry.getValue()});
}
db.setTransactionSuccessful();
}finally{
db.endTransaction();
}
db.close();
}
/**

實時更新每條線程已經下載的文件長度
@param path
@param map
*/
public void update(String path, Map<Integer, Integer> map){
SQLiteDatabase db = openHelper.getWritableDatabase();
db.beginTransaction();

try{
for(Map.Entry<Integer, Integer> entry : map.entrySet()){
db.execSQL("update filedownlog set downlength=? where downpath=? and threadid=?",
new Object[]{entry.getValue(), path, entry.getKey()});
}
db.setTransactionSuccessful();
}finally{
db.endTransaction();
}
db.close();
}
/**

當文件下載完成后，刪除對應的下載記錄
@param path
*/
public void delete(String path){
SQLiteDatabase db = openHelper.getWritableDatabase();
db.execSQL("delete from filedownlog where downpath=?", new Object[]{path});
db.close();
}
}</pre>
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Android Android開發移動開發
Android多線程.斷點續傳下載

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