代碼非常簡單實(shí)用，這里就不多廢話了，直接奉上源碼
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package android.mooc.tools; import java.io.BufferedInputStream;import java.io.File;import java.io.RandomAccessFile;import java.net.URL;import java.net.URLConnection; import android.util.Log; public class FileDownloadThread extends Thread { private static final int BUFFER_SIZE = 1024; private URL url; private File file; private int startPosition; private int endPosition; private int curPosition; // 用于標(biāo)識當(dāng)前線程是否下載完成 private boolean finished = false; private int downloadSize; private boolean state; boolean destory; public boolean isDestory() { return destory; } public void setDestory(boolean destory) { this.destory = destory; } public FileDownloadThread(URL url, File file, int startPosition, int endPosition) { this.url = url; this.file = file; this.startPosition = startPosition; this.curPosition = startPosition; this.endPosition = endPosition; this.downloadSize = 0; } @Override public void run() { destory = false; state = true; BufferedInputStream bis = null; RandomAccessFile fos = null; byte[] buf = new byte[BUFFER_SIZE]; URLConnection con = null; try { con = url.openConnection(); con.setAllowUserInteraction(true); // 設(shè)置當(dāng)前線程下載的起點(diǎn)，終點(diǎn) con.setRequestProperty("Range", "bytes=" + startPosition + "-" + endPosition); con.setRequestProperty("accept", "*/*"); con.setRequestProperty("connection", "Keep-Alive"); con.setRequestProperty("Accept-Language", "zh-CN"); con.setRequestProperty("Charset", "UTF-8"); con.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)"); // 使用java中的RandomAccessFile 對文件進(jìn)行隨機(jī)讀寫操作 fos = new RandomAccessFile(file, "rw"); // 設(shè)置開始寫文件的位置 fos.seek(startPosition); bis = new BufferedInputStream(con.getInputStream()); // 開始循環(huán)以流的形式讀寫文件 while ((curPosition < endPosition) && (!destory)) { while (state == false) { sleep(2000); } int len = bis.read(buf, 0, BUFFER_SIZE); if (len != -1) { fos.write(buf, 0, len); curPosition = curPosition + len; if (curPosition > endPosition) { downloadSize += len - (curPosition - endPosition); } else { downloadSize += len; } } Log.i("333", "run" + " len=" + len); } // 下載完成設(shè)為true this.finished = true; bis.close(); fos.close(); } catch (Exception e) { e.printStackTrace(); } } public boolean isState() { return state; } public void setState(boolean state) { this.state = state; } public boolean isFinished() { return finished; } public int getDownloadSize() { return downloadSize; } public void setDownloadSize(int downloadSize) { this.downloadSize = downloadSize; } } |
以上所述就是本文的全部內(nèi)容了，希望大家能夠喜歡。
