- 浏览: 930914 次
- 性别:
- 来自: 魔都
文章分类
- 全部博客 (745)
- MultiThread (19)
- My Plan (118)
- JavaBasic (61)
- MyInterview (104)
- InternetTechnique (5)
- ProjectConclusion (1)
- Maven (5)
- MogoDb (5)
- Hadoop (11)
- Memcached (6)
- TechniqueCollect (1)
- Ibaits (1)
- Android (34)
- ItLife (40)
- Tree (2)
- ProjectArchitect (7)
- Open Source (3)
- liunx (5)
- socket (8)
- Spring (27)
- DesginPattern (35)
- WebBasic (13)
- English (13)
- structs (1)
- structs2 (2)
- Oracle (17)
- Hibernate (2)
- JavaScript (4)
- Jdbc (1)
- Jvm (15)
- Ibatis (1)
- DataStructures (13)
- Https/Socket/Tcp/Ip (3)
- Linux (4)
- Webservice (7)
- Io (2)
- Svn (1)
- Css (1)
- Ajax (1)
- ExtJs (1)
- UML (2)
- DataBase (6)
- BankTechnique (3)
- SpringMvc (3)
- Nio (3)
- Load Balancing/Cluster (3)
- Tools (1)
- javaPerformanceOptimization (8)
- Lucene(SEO) (1)
- My Think (80)
- NodeJs (1)
- Quartz (1)
- Distributed-java (1)
- MySql (7)
- Project (4)
- junit (4)
- framework (1)
- enCache (1)
- git (2)
- SCJP (1)
- sd (1)
最新评论
-
lkjxshi:
你都这水平了还考这个证干嘛
SCJP 认证考试指南 -
钟逸华:
问的真多
百度java开发面试题(转) -
zuimeitulip:
觉得我就是这样的,从小阅读量就很少,导致现在的读的速度非常慢, ...
让读书成为一种习惯 -
DDT_123456:
我觉得你是不符合要求。问你hashmap的那个问题,你那样回答 ...
阿里面试2(转) -
jingjing0907:
刚刚写了很多读过此博客的感受,竟然没有发上去,以为我注册账号还 ...
让读书成为一种习惯
package cn.itcast.net.download; import java.io.File; import java.io.RandomAccessFile; import java.net.HttpURLConnection; import java.net.URL; import java.util.LinkedHashMap; import java.util.Map; import java.util.UUID; import java.util.concurrent.ConcurrentHashMap; import java.util.regex.Matcher; import java.util.regex.Pattern; import cn.itcast.service.FileService; import android.content.Context; import android.util.Log; /** * 文件下载器 * FileDownloader loader = new FileDownloader(context, "http://browse.babasport.com/ejb3/ActivePort.exe", new File("D:\\androidsoft\\test"), 2); loader.getFileSize();//得到文件总大小 try { loader.download(new DownloadProgressListener(){ public void onDownloadSize(int size) { print("已经下载:"+ size); } }); } catch (Exception e) { e.printStackTrace(); } */ public class FileDownloader { private static final String TAG = "FileDownloader"; private Context context; private FileService fileService; /* 已下载文件长度 */ private int downloadSize = 0; /* 原始文件长度 */ private int fileSize = 0; /* 线程数 */ private DownloadThread[] threads; /* 本地保存文件 */ private File saveFile; /* 缓存各线程下载的长度*/ private Map<Integer, Integer> data = new ConcurrentHashMap<Integer, Integer>(); /* 每条线程下载的长度 */ private int block; /* 下载路径 */ private String downloadUrl; /** * 获取线程数 */ public int getThreadSize() { return threads.length; } /** * 获取文件大小 * @return */ public int getFileSize() { return fileSize; } /** * 累计已下载大小 * @param size */ protected synchronized void append(int size) { downloadSize += size; } /** * 更新指定线程最后下载的位置 * @param threadId 线程id * @param pos 最后下载的位置 */ protected synchronized void update(int threadId, int pos) { this.data.put(threadId, pos); this.fileService.update(this.downloadUrl, this.data); } /** * 构建文件下载器 * @param downloadUrl 下载路径 * @param fileSaveDir 文件保存目录 * @param threadNum 下载线程数 */ 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(5*1000); 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();//根据响应获取文件大小 if (this.fileSize <= 0) throw new RuntimeException("Unkown file size "); String filename = getFileName(conn);//获取文件名称 this.saveFile = new File(fileSaveDir, filename);//构建保存文件 Map<Integer, Integer> logdata = fileService.getData(downloadUrl);//获取下载记录 if(logdata.size()>0){//如果存在下载记录 for(Map.Entry<Integer, Integer> entry : logdata.entrySet()) data.put(entry.getKey(), entry.getValue());//把各条线程已经下载的数据长度放入data中 } if(this.data.size()==this.threads.length){//下面计算所有线程已经下载的数据长度 for (int i = 0; i < this.threads.length; i++) { this.downloadSize += this.data.get(i+1); } print("已经下载的长度"+ this.downloadSize); } //计算每条线程下载的数据长度 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"); } } /** * 获取文件名 */ private String getFileName(HttpURLConnection conn) { String filename = this.downloadUrl.substring(this.downloadUrl.lastIndexOf('/') + 1); if(filename==null || "".equals(filename.trim())){//如果获取不到文件名称 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";//默认取一个文件名 } return filename; } /** * 开始下载文件 * @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 * @return 已下载文件大小 * @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);//初始化每条线程已经下载的数据长度为0 } } for (int i = 0; i < this.threads.length; i++) {//开启线程进行下载 int downLength = this.data.get(i+1); if(downLength < this.block && this.downloadSize<this.fileSize){//判断线程是否已经完成下载,否则继续下载 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;//下载未完成 while (notFinish) {// 循环判断所有线程是否完成下载 Thread.sleep(900); notFinish = false;//假定全部线程下载完成 for (int i = 0; i < this.threads.length; i++){ if (this.threads[i] != null && !this.threads[i].isFinish()) {//如果发现线程未完成下载 notFinish = true;//设置标志为下载没有完成 if(this.threads[i].getDownLength() == -1){//如果下载失败,再重新下载 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);//通知目前已经下载完成的数据长度 } fileService.delete(this.downloadUrl); } catch (Exception e) { print(e.toString()); throw new Exception("file download fail"); } return this.downloadSize; } /** * 获取Http响应头字段 * @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头字段 * @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()); } } private static void print(String msg){ Log.i(TAG, msg); } } package cn.itcast.net.download; import java.io.File; import java.io.InputStream; import java.io.RandomAccessFile; import java.net.HttpURLConnection; import java.net.URL; import android.util.Log; public class DownloadThread extends Thread { private static final String TAG = "DownloadThread"; private File saveFile; private URL downUrl; private int block; /* 下载开始位置 */ private int threadId = -1; private int downLength; private boolean finish = false; private FileDownloader downloader; 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){//未下载完成 try { 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;//开始位置 int endPos = block * threadId -1;//结束位置 http.setRequestProperty("Range", "bytes=" + startPos + "-"+ endPos);//设置获取实体数据的范围 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); } } } private static void print(String msg){ Log.i(TAG, msg); } /** * 下载是否完成 * @return */ public boolean isFinish() { return finish; } /** * 已经下载的内容大小 * @return 如果返回值为-1,代表下载失败 */ public long getDownLength() { return downLength; } } package cn.itcast.net.download; public interface DownloadProgressListener { public void onDownloadSize(int size); } package cn.itcast.service; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DBOpenHelper extends SQLiteOpenHelper { private static final String DBNAME = "itcast.db"; private static final int VERSION = 1; 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); } } package cn.itcast.service; import java.util.HashMap; import java.util.Map; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; /** * 业务bean * */ public class FileService { private DBOpenHelper openHelper; public FileService(Context context) { openHelper = new DBOpenHelper(context); } /** * 获取每条线程已经下载的文件长度 * @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; } /** * 保存每条线程已经下载的文件长度 * @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(); } /** * 实时更新每条线程已经下载的文件长度 * @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(); } /** * 当文件下载完成后,删除对应的下载记录 * @param path */ public void delete(String path){ SQLiteDatabase db = openHelper.getWritableDatabase(); db.execSQL("delete from filedownlog where downpath=?", new Object[]{path}); db.close(); } } package cn.itcast.download; import java.io.File; import cn.itcast.net.download.DownloadProgressListener; import cn.itcast.net.download.FileDownloader; import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { private EditText pathText; private ProgressBar downloadbar; private TextView resultView; //它用于往消息队列发送消息,当Handler被创建时会自动绑定到Handler被创建时所在的线程所绑定的消息队列 private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: downloadbar.setProgress(msg.getData().getInt("size"));//把当前已经下载的数据长度设置为进度条的当前刻度 float num = (float)downloadbar.getProgress() / (float)downloadbar.getMax(); int result = (int)(num * 100); resultView.setText(result + "%"); if(downloadbar.getProgress() == downloadbar.getMax()){ Toast.makeText(MainActivity.this, R.string.suceess, 1).show(); } break; case -1: Toast.makeText(MainActivity.this, R.string.error, 1).show(); break; } } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); pathText = (EditText) findViewById(R.id.path); downloadbar = (ProgressBar) findViewById(R.id.downloadbar); resultView = (TextView) findViewById(R.id.result); Button button = (Button) findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ String path = pathText.getText().toString(); download(path, Environment.getExternalStorageDirectory()); }else{ Toast.makeText(MainActivity.this, R.string.sdcarderror, 1).show(); } } }); } //对UI控件的更新只能由主线程(UI线程)负责,如果不在UI线程更新控件,更新后的值不会被重绘到屏幕上 private void download(final String path, final File saveDir) { new Thread(new Runnable() { @Override public void run() { try { FileDownloader loader = new FileDownloader(MainActivity.this, path, saveDir, 3); downloadbar.setMax(loader.getFileSize());//设置进度条的最大刻度为文件的大小 loader.download(new DownloadProgressListener(){ @Override public void onDownloadSize(int size) { Message msg = new Message(); msg.what = 1; msg.getData().putInt("size", size); handler.sendMessage(msg); //msg.target = handler; }}); } catch (Exception e) { Message msg = new Message(); msg.what = -1; handler.sendMessage(msg); } } }).start(); } }
- MulThreadDownload.rar (21.9 KB)
- 下载次数: 14
发表评论
-
子线程循环10次,接着主线程循环100,接着又回到子线程循环10次,接着再回到主线程又循环100,如此循环50次,请写出程序。
2013-04-15 14:00 1234public class ThreadTest { ... -
java并发包(java.util.concurrent)
2013-03-26 23:46 1989java并发包(java.util.concurrent) ... -
java 死锁及解决
2013-03-19 22:54 931url:http://leowzy.iteye.com/bl ... -
断点续传的原理
2013-03-08 12:32 1137url:http://www.cnblogs.com/Kil ... -
《java并发编程实践》读书笔记
2012-08-21 23:07 972文章链接:http://www.iteye.com/blogs ... -
ThreadLocal详解
2012-06-27 23:47 935文章链接: http://www.iteye.com/top ... -
多线程并发(java编程思想笔记)
2012-06-25 23:50 24251.Executor,java.util.concurr ... -
多线程例题(空中网)
2012-06-17 19:16 998文章链接:http://blog.csdn ... -
ArrayBlockingQueue(阻塞队列)
2012-06-17 19:00 1535package cn.itcast.day3.thread; ... -
多线程笔记(黑马)
2012-06-17 18:59 9941.多线程范围内间的线 ... -
设计缓冲系统(多线程)
2012-06-17 18:57 1026package cn.itcast.day3.thread; ... -
Java多线程与并发库高级应用(传智播客)
2012-06-13 15:14 3733------------------------------- ... -
java多线程断点续传
2012-06-05 10:00 1322在android下面的断点 ... -
多线程高新(黑马程序员)
2012-03-30 16:23 1206------------------------------- ... -
生产者/消费者JAVA多线程
2012-03-28 09:58 1030文章链接:http://blog.csdn.net/bnuch ... -
主线程跟子线程怎么通讯 java
2012-03-17 19:24 4591学到多线程,编了一个简单地电脑城进出货模拟系统。 代码有点长 ... -
主线程与子线程之间通讯, 子线程与子线程之间的通讯 Java
2012-03-17 19:19 5350线程之间的通讯可以有两种方法. 一.利用全局变量. 大家都可 ... -
理解多线程
2011-09-27 17:40 841一、理解多线程 多 ...
相关推荐
AndroidDownloadDemo》Android断点续传下载 AndroidMultiDownloadDemo》Android多线程断点续传下载
android多线程断点续传下载源代码,有需要的朋友可以下载
Android多线程断点续传下载+在线播放音乐
可设置下载的线程数、下载任务的线程函数、多线程断点续传下载一个文件、关于BOOL bForceDownload/*=FALSE*/的定义,如果为 TRUE 表示强制性重新下载,以下载的部分将会被删除,FALSE 表示断点续传,并创建多线程...
《Android多线程断点续传下载网络上的音/视频等各种文件》多线程,断点续传,各种网络上的数据,下载网络上的数据时基本功!加油了各位!
多线程 断点续传 java 下载 java多线程实例
FTP、HTTP 多线程断点续传下载文件.rar
Android 多线程断点续传下载,利用线程池减小线程开销,http://mp.blog.csdn.net/postedit?ref=toolbar
点量Http、FTP多线程断点续传下载组件(下载DLL)的开发目的是让用户可以无需关心Http/FTP协议的具体细节,只需要几十行甚至几行代码,便可以实现一个功能完善的Http/FTP下载软件。点量Http/FTP下载组件(DLL)支持...
Android网络多线程断点续传下载 示例
这是java实现多线程断点续传下载功能的源代码,对于学习java网络编程、多线程等基础知识的同学有一定的参考作用,希望能够这个资源能够对你们有帮助
这个是java开发的多线程断点续传下载demo,内有详细注释,是练习android多线程断点续传下载时写的测试demo,下面的android开发的多线程断点续传下载demo是基于这个移植过去的,使用java开发的可以参考这个。
点量Http、FTP多线程断点续传下载组件(下载DLL)的开发目的是让用户可以无需关心Http/FTP协议的具体细节,只需要几十行甚至几行代码,便可以实现一个功能完善的Http/FTP下载软件。点量Http/FTP下载组件(DLL)支持...
VC++ FTP、HTTP 多线程断点续传下载文件源码.rar
Android应用源码之Android多线程断点续传下载+在线播放音乐.rar
VC++多线程断点续传下载代码!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
实现多线程断点续传,当进入暂停后,下次继续下载直接从已经下载的地方开始下载,节约了手机流量,更方便,更便捷