首先是文件上传,这个要用到服务器
关键代码:
FileServer.java
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.io.PushbackInputStream;
- import java.io.RandomAccessFile;
- import java.net.ServerSocket;
- import java.net.Socket;
- import java.text.SimpleDateFormat;
- import java.util.Date;
- import java.util.HashMap;
- import java.util.Map;
- import java.util.Properties;
- import java.util.Set;
- import java.util.concurrent.ExecutorService;
- import java.util.concurrent.Executors;
- import util.FileLogInfo;
- import util.StreamTool;
- public class FileServer {
- private ExecutorService executorService;//线程池
- private int port;//监听端口
- private boolean quit = false;//退出
- private ServerSocket server;
- private Map<Long, FileLogInfo> datas = new HashMap<Long, FileLogInfo>();//存放断点数据,以后改为数据库存放
- public FileServer(int port)
- {
- this.port = port;
- //创建线程池,池中具有(cpu个数*50)条线程
- executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 50);
- }
- /**
- * 退出
- */
- public void quit()
- {
- this.quit = true;
- try
- {
- server.close();
- }catch (IOException e)
- {
- e.printStackTrace();
- }
- }
- /**
- * 启动服务
- * @throws Exception
- */
- public void start() throws Exception
- {
- server = new ServerSocket(port);//实现端口监听
- while(!quit)
- {
- try
- {
- Socket socket = server.accept();
- executorService.execute(new SocketTask(socket));//为支持多用户并发访问,采用线程池管理每一个用户的连接请求
- }catch (Exception e)
- {
- e.printStackTrace();
- }
- }
- }
- private final class SocketTask implements Runnable
- {
- private Socket socket = null;
- public SocketTask(Socket socket)
- {
- this.socket = socket;
- }
- @Override
- public void run()
- {
- try
- {
- System.out.println("FileServer accepted connection "+ socket.getInetAddress()+ ":"+ socket.getPort());
- //得到客户端发来的第一行协议数据:Content-Length=143253434;filename=xxx.3gp;sourceid=
- //如果用户初次上传文件,sourceid的值为空。
- InputStream inStream = socket.getInputStream();
- String head = StreamTool.readLine(inStream);
- System.out.println("FileServer head:"+head);
- if(head!=null)
- {
- //下面从协议数据中提取各项参数值
- String[] items = head.split(";");
- String filelength = items[0].substring(items[0].indexOf("=")+1);
- String filename = items[1].substring(items[1].indexOf("=")+1);
- String sourceid = items[2].substring(items[2].indexOf("=")+1);
- //生成资源id,如果需要唯一性,可以采用UUID
- long id = System.currentTimeMillis();
- FileLogInfo log = null;
- if(sourceid!=null && !"".equals(sourceid))
- {
- id = Long.valueOf(sourceid);
- //查找上传的文件是否存在上传记录
- log = find(id);
- }
- File file = null;
- int position = 0;
- //如果上传的文件不存在上传记录,为文件添加跟踪记录
- if(log==null)
- {
- //设置存放的位置与当前应用的位置有关
- File dir = new File("c:/temp/");
- if(!dir.exists()) dir.mkdirs();
- file = new File(dir, filename);
- //如果上传的文件发生重名,然后进行改名
- if(file.exists())
- {
- filename = filename.substring(0, filename.indexOf(".")-1)+ dir.listFiles().length+ filename.substring(filename.indexOf("."));
- file = new File(dir, filename);
- }
- save(id, file);
- }
- // 如果上传的文件存在上传记录,读取上次的断点位置
- else
- {
- System.out.println("FileServer have exits log not null");
- //从上传记录中得到文件的路径
- file = new File(log.getPath());
- if(file.exists())
- {
- File logFile = new File(file.getParentFile(), file.getName()+".log");
- if(logFile.exists())
- {
- Properties properties = new Properties();
- properties.load(new FileInputStream(logFile));
- //读取断点位置
- position = Integer.valueOf(properties.getProperty("length"));
- }
- }
- }
- //***************************上面是对协议头的处理,下面正式接收数据***************************************
- //向客户端请求传输数据
- OutputStream outStream = socket.getOutputStream();
- String response = "sourceid="+ id+ ";position="+ position+ "%";
- //服务器收到客户端的请求信息后,给客户端返回响应信息:sourceid=1274773833264;position=position
- //sourceid由服务生成,唯一标识上传的文件,position指示客户端从文件的什么位置开始上传
- outStream.write(response.getBytes());
- RandomAccessFile fileOutStream = new RandomAccessFile(file, "rwd");
- //设置文件长度
- if(position==0) fileOutStream.setLength(Integer.valueOf(filelength));
- //移动文件指定的位置开始写入数据
- fileOutStream.seek(position);
- byte[] buffer = new byte[1024];
- int len = -1;
- int length = position;
- //从输入流中读取数据写入到文件中,并将已经传入的文件长度写入配置文件,实时记录文件的最后保存位置
- while( (len=inStream.read(buffer)) != -1)
- {
- fileOutStream.write(buffer, 0, len);
- length += len;
- Properties properties = new Properties();
- properties.put("length", String.valueOf(length));
- FileOutputStream logFile = new FileOutputStream(new File(file.getParentFile(), file.getName()+".log"));
- //实时记录文件的最后保存位置
- properties.store(logFile, null);
- logFile.close();
- }
- //如果长传长度等于实际长度则表示长传成功
- if(length==fileOutStream.length()){
- delete(id);
- }
- fileOutStream.close();
- inStream.close();
- outStream.close();
- file = null;
- }
- }
- catch (Exception e)
- {
- e.printStackTrace();
- }
- finally{
- try
- {
- if(socket!=null && !socket.isClosed()) socket.close();
- }
- catch (IOException e)
- {
- e.printStackTrace();
- }
- }
- }
- }
- /**
- * 查找在记录中是否有sourceid的文件
- * @param sourceid
- * @return
- */
- public FileLogInfo find(Long sourceid)
- {
- return datas.get(sourceid);
- }
- /**
- * 保存上传记录,日后可以改成通过数据库存放
- * @param id
- * @param saveFile
- */
- public void save(Long id, File saveFile)
- {
- System.out.println("save logfile "+id);
- datas.put(id, new FileLogInfo(id, saveFile.getAbsolutePath()));
- }
- /**
- * 当文件上传完毕,删除记录
- * @param sourceid
- */
- public void delete(long sourceid)
- {
- System.out.println("delete logfile "+sourceid);
- if(datas.containsKey(sourceid)) datas.remove(sourceid);
- }
- }
由于在上面的流程图中已经进行了详细的分析,我在这儿就不讲了,只是在存储数据的时候服务器没有用数据库去存储,这儿只是为了方便,所以要想测试断点上传,服务器是不能停的,否则数据就没有了,在以后改进的时候应该用数据库去存储数据。
文件上传客户端:
关键代码:
UploadActivity.java
- package com.hao;
- import java.io.File;
- import java.util.List;
- import com.hao.upload.UploadThread;
- import com.hao.upload.UploadThread.UploadProgressListener;
- import com.hao.util.ConstantValues;
- import com.hao.util.FileBrowserActivity;
- import android.app.Activity;
- import android.app.Dialog;
- import android.app.ProgressDialog;
- import android.content.DialogInterface;
- import android.content.Intent;
- import android.content.res.Resources;
- import android.net.Uri;
- import android.os.Bundle;
- import android.os.Environment;
- import android.os.Handler;
- import android.os.Message;
- import android.util.Log;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.TextView;
- import android.widget.Toast;
- /**
- *
- * @author Administrator
- *
- */
- public class UploadActivity extends Activity implements OnClickListener{
- private static final String TAG = "SiteFileFetchActivity";
- private Button download, upload, select_file;
- private TextView info;
- private static final int PROGRESS_DIALOG = 0;
- private ProgressDialog progressDialog;
- private UploadThread uploadThread;
- private String uploadFilePath = null;
- private String fileName;
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.upload);
- initView();
- }
- private void initView(){
- download = (Button) findViewById(R.id.download);
- download.setOnClickListener(this);
- upload = (Button) findViewById(R.id.upload);
- upload.setOnClickListener(this);
- info = (TextView) findViewById(R.id.info);
- select_file = (Button) findViewById(R.id.select_file);
- select_file.setOnClickListener(this);
- }
- @Override
- protected void onActivityResult(int requestCode, int resultCode, Intent data) {
- // TODO Auto-generated method stub
- super.onActivityResult(requestCode, resultCode, data);
- if (resultCode == RESULT_OK) {
- if (requestCode == 1) {
- Uri uri = data.getData(); // 接收用户所选文件的路径
- info.setText("select: " + uri); // 在界面上显示路径
- uploadFilePath = uri.getPath();
- int last = uploadFilePath.lastIndexOf("/");
- uploadFilePath = uri.getPath().substring(0, last+1);
- fileName = uri.getLastPathSegment();
- }
- }
- }
- protected Dialog onCreateDialog(int id) {
- switch(id) {
- case PROGRESS_DIALOG:
- progressDialog = new ProgressDialog(UploadActivity.this);
- progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
- progressDialog.setButton("暂停", new DialogInterface.OnClickListener() {
- @Override
- public void onClick(DialogInterface dialog, int which) {
- // TODO Auto-generated method stub
- uploadThread.closeLink();
- dialog.dismiss();
- }
- });
- progressDialog.setMessage("正在上传...");
- progressDialog.setMax(100);
- return progressDialog;
- default:
- return null;
- }
- }
- /**
- * 使用Handler给创建他的线程发送消息,
- * 匿名内部类
- */
- private Handler handler = new Handler()
- {
- @Override
- public void handleMessage(Message msg)
- {
- //获得上传长度的进度
- int length = msg.getData().getInt("size");
- progressDialog.setProgress(length);
- if(progressDialog.getProgress()==progressDialog.getMax())//上传成功
- {
- progressDialog.dismiss();
- Toast.makeText(UploadActivity.this, getResources().getString(R.string.upload_over), 1).show();
- }
- }
- };
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- Resources r = getResources();
- switch(v.getId()){
- case R.id.select_file:
- Intent intent = new Intent();
- //设置起始目录和查找的类型
- intent.setDataAndType(Uri.fromFile(new File("/sdcard")), "*/*");//"*/*"表示所有类型,设置起始文件夹和文件类型
- intent.setClass(UploadActivity.this, FileBrowserActivity.class);
- startActivityForResult(intent, 1);
- break;
- case R.id.download:
- startActivity(new Intent(UploadActivity.this, SmartDownloadActivity.class));
- break;
- case R.id.upload:
- if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))//判断SDCard是否存在
- {
- if(uploadFilePath == null){
- Toast.makeText(UploadActivity.this, "还没设置上传文件", 1).show();
- }
- System.out.println("uploadFilePath:"+uploadFilePath+" "+fileName);
- //取得SDCard的目录
- File uploadFile = new File(new File(uploadFilePath), fileName);
- Log.i(TAG, "filePath:"+uploadFile.toString());
- if(uploadFile.exists())
- {
- showDialog(PROGRESS_DIALOG);
- info.setText(uploadFile+" "+ConstantValues.HOST+":"+ConstantValues.PORT);
- progressDialog.setMax((int) uploadFile.length());//设置长传文件的最大刻度
- uploadThread = new UploadThread(UploadActivity.this, uploadFile, ConstantValues.HOST, ConstantValues.PORT);
- uploadThread.setListener(new UploadProgressListener() {
- @Override
- public void onUploadSize(int size) {
- // TODO Auto-generated method stub
- Message msg = new Message();
- msg.getData().putInt("size", size);
- handler.sendMessage(msg);
- }
- });
- uploadThread.start();
- }
- else
- {
- Toast.makeText(UploadActivity.this, "文件不存在", 1).show();
- }
- }
- else
- {
- Toast.makeText(UploadActivity.this, "SDCard不存在!", 1).show();
- }
- break;
- }
- }
- }
UploadThread.java
- package com.hao.upload;
- import java.io.File;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.io.RandomAccessFile;
- import java.net.Socket;
- import android.content.Context;
- import android.util.Log;
- import com.hao.db.UploadLogService;
- import com.hao.util.StreamTool;
- public class UploadThread extends Thread {
- private static final String TAG = "UploadThread";
- /*需要上传文件的路径*/
- private File uploadFile;
- /*上传文件服务器的IP地址*/
- private String dstName;
- /*上传服务器端口号*/
- private int dstPort;
- /*上传socket链接*/
- private Socket socket;
- /*存储上传的数据库*/
- private UploadLogService logService;
- private UploadProgressListener listener;
- public UploadThread(Context context, File uploadFile, final String dstName,final int dstPort){
- this.uploadFile = uploadFile;
- this.dstName = dstName;
- this.dstPort = dstPort;
- logService = new UploadLogService(context);
- }
- public void setListener(UploadProgressListener listener) {
- this.listener = listener;
- }
- /**
- * 模拟断开连接
- */
- public void closeLink(){
- try{
- if(socket != null) socket.close();
- }catch(IOException e){
- e.printStackTrace();
- Log.e(TAG, "close socket fail");
- }
- }
- @Override
- public void run() {
- // TODO Auto-generated method stub
- try {
- // 判断文件是否已有上传记录
- String souceid = logService.getBindId(uploadFile);
- // 构造拼接协议
- String head = "Content-Length=" + uploadFile.length()
- + ";filename=" + uploadFile.getName() + ";sourceid="
- + (souceid == null ? "" : souceid) + "%";
- // 通过Socket取得输出流
- socket = new Socket(dstName, dstPort);
- OutputStream outStream = socket.getOutputStream();
- outStream.write(head.getBytes());
- Log.i(TAG, "write to outStream");
- InputStream inStream = socket.getInputStream();
- // 获取到字符流的id与位置
- String response = StreamTool.readLine(inStream);
- Log.i(TAG, "response:" + response);
- String[] items = response.split(";");
- String responseid = items[0].substring(items[0].indexOf("=") + 1);
- String position = items[1].substring(items[1].indexOf("=") + 1);
- // 代表原来没有上传过此文件,往数据库添加一条绑定记录
- if (souceid == null) {
- logService.save(responseid, uploadFile);
- }
- RandomAccessFile fileOutStream = new RandomAccessFile(uploadFile, "r");
- // 查找上次传送的最终位置,并从这开始传送
- fileOutStream.seek(Integer.valueOf(position));
- byte[] buffer = new byte[1024];
- int len = -1;
- // 初始化上传的数据长度
- int length = Integer.valueOf(position);
- while ((len = fileOutStream.read(buffer)) != -1) {
- outStream.write(buffer, 0, len);
- // 设置长传数据长度
- length += len;
- listener.onUploadSize(length);
- }
- fileOutStream.close();
- outStream.close();
- inStream.close();
- socket.close();
- // 判断上传完则删除数据
- if (length == uploadFile.length())
- logService.delete(uploadFile);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- public interface UploadProgressListener{
- void onUploadSize(int size);
- }
- }
下面是多线程下载
SmartDownloadActivity.java
- package com.hao;
- import java.io.File;
- import com.hao.R;
- import com.hao.R.id;
- import com.hao.R.layout;
- import com.hao.download.SmartFileDownloader;
- import com.hao.download.SmartFileDownloader.SmartDownloadProgressListener;
- import com.hao.util.ConstantValues;
- 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.ProgressBar;
- import android.widget.TextView;
- import android.widget.Toast;
- /**
- *
- * @author Administrator
- *
- */
- public class SmartDownloadActivity extends Activity {
- private ProgressBar downloadbar;
- private TextView resultView;
- private String path = ConstantValues.DOWNLOAD_URL;
- SmartFileDownloader loader;
- private Handler handler = new Handler() {
- @Override
- // 信息
- public void handleMessage(Message msg) {
- switch (msg.what) {
- case 1:
- int size = msg.getData().getInt("size");
- downloadbar.setProgress(size);
- float result = (float) downloadbar.getProgress() / (float) downloadbar.getMax();
- int p = (int) (result * 100);
- resultView.setText(p + "%");
- if (downloadbar.getProgress() == downloadbar.getMax())
- Toast.makeText(SmartDownloadActivity.this, "下载成功", 1).show();
- break;
- case -1:
- Toast.makeText(SmartDownloadActivity.this, msg.getData().getString("error"), 1).show();
- break;
- }
- }
- };
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.download);
- Button button = (Button) this.findViewById(R.id.button);
- Button closeConn = (Button) findViewById(R.id.closeConn);
- closeConn.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- if(loader != null){
- finish();
- }else{
- Toast.makeText(SmartDownloadActivity.this, "还没有开始下载,不能暂停", 1).show();
- }
- }
- });
- downloadbar = (ProgressBar) this.findViewById(R.id.downloadbar);
- resultView = (TextView) this.findViewById(R.id.result);
- resultView.setText(path);
- button.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
- download(path, ConstantValues.FILE_PATH);
- } else {
- Toast.makeText(SmartDownloadActivity.this, "没有SDCard", 1).show();
- }
- }
- });
- }
- // 对于UI控件的更新只能由主线程(UI线程)负责,如果在非UI线程更新UI控件,更新的结果不会反映在屏幕上,某些控件还会出错
- private void download(final String path, final File dir) {
- new Thread(new Runnable() {
- @Override
- public void run() {
- try {
- loader = new SmartFileDownloader(SmartDownloadActivity.this, path, dir, 3);
- int length = loader.getFileSize();// 获取文件的长度
- downloadbar.setMax(length);
- loader.download(new SmartDownloadProgressListener() {
- @Override
- public void onDownloadSize(int size) {// 可以实时得到文件下载的长度
- Message msg = new Message();
- msg.what = 1;
- msg.getData().putInt("size", size);
- handler.sendMessage(msg);
- }
- });
- } catch (Exception e) {
- Message msg = new Message();// 信息提示
- msg.what = -1;
- msg.getData().putString("error", "下载失败");// 如果下载错误,显示提示失败!
- handler.sendMessage(msg);
- }
- }
- }).start();// 开始
- }
- }
这个单个的下载线程
SmartDownloadThread.java
- package com.hao.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;
- /**
- * 线程下载
- * @author Administrator
- *
- */
- public class SmartDownloadThread extends Thread {
- private static final String TAG = "SmartDownloadThread";
- 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 SmartFileDownloader downloader;
- public SmartDownloadThread(SmartFileDownloader 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.saveLogFile();
- 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;
- }
- }
总得下载线程
SmartFileDownloader.java
- package com.hao.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 com.hao.db.DownloadFileService;
- import android.content.Context;
- import android.util.Log;
- /**
- * 文件下载主程序
- * @author Administrator
- *
- */
- public class SmartFileDownloader {
- private static final String TAG = "SmartFileDownloader";
- private Context context;
- private DownloadFileService fileService;
- /* 已下载文件长度 */
- private int downloadSize = 0;
- /* 原始文件长度 */
- private int fileSize = 0;
- /*原始文件名*/
- private String fileName;
- /* 线程数 */
- private SmartDownloadThread[] 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;
- /**
- * 获取文件名
- */
- public String getFileName(){
- return this.fileName;
- }
- /**
- * 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 void update(int threadId, int pos) {
- this.data.put(threadId, pos);
- }
- /**
- * 保存记录文件
- */
- protected synchronized void saveLogFile() {
- 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 SmartFileDownloader(Context context, String downloadUrl,
- File fileSaveDir, int threadNum) {
- try {
- this.context = context;
- this.downloadUrl = downloadUrl;
- fileService = new DownloadFileService(this.context);
- URL url = new URL(this.downloadUrl);
- if (!fileSaveDir.exists()) fileSaveDir.mkdirs();
- this.threads = new SmartDownloadThread[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 ");
- fileName = getFileName(conn);
- this.saveFile = new File(fileSaveDir, fileName);/* 保存文件 */
- Map<Integer, Integer> logdata = fileService.getData(downloadUrl);
- if (logdata.size() > 0) {
- for (Map.Entry<Integer, Integer> entry : logdata.entrySet())
- data.put(entry.getKey(), entry.getValue());
- }
- //划分每个线程下载文件长度
- this.block = (this.fileSize % this.threads.length) == 0 ? this.fileSize / this.threads.length
- : this.fileSize / this.threads.length + 1;
- if (this.data.size() == this.threads.length) {
- 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);
- }
- } 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);//链接的最后一个/就是文件名
- 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);
- print("ConnHeader:"+mine+" ");
- 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(SmartDownloadProgressListener 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();// 清除数据
- for (int i = 0; i < this.threads.length; i++) {
- this.data.put(i + 1, 0);
- }
- }
- for (int i = 0; i < this.threads.length; i++) {
- int downLength = this.data.get(i + 1);
- if (downLength < this.block && this.downloadSize < this.fileSize) { // 该线程未完成下载时,继续下载
- this.threads[i] = new SmartDownloadThread(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) {// 循环判断是否下载完毕
- Thread.sleep(900);
- notFinish = false;// 假定下载完成
- for (int i = 0; i < this.threads.length; i++) {
- if (this.threads[i] != null && !this.threads[i].isFinish()) {
- notFinish = true;// 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 SmartDownloadThread(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);
- }
- 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());
- }
- }
- // 打印日志
- private static void print(String msg) {
- Log.i(TAG, msg);
- }
- public interface SmartDownloadProgressListener {
- public void onDownloadSize(int size);
- }
- }
好了这里只是将主要的代码分享出来,主要是为了了解他的基本流程,然后自己可以扩展,和优化