Java implementation for android file download thread class
- 2020-04-01 04:03:28
- OfStack
The code is very simple and practical, there is no more nonsense here, directly to the source code
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;
//Used to identify whether the current thread has completed the download
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);
//Sets the starting and ending point of the current thread download
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)");
//RandomAccessFile in Java is used for random read and write operations to a file
fos = new RandomAccessFile(file, "rw");
//Sets the location to start writing to the file
fos.seek(startPosition);
bis = new BufferedInputStream(con.getInputStream());
//Start the loop to read and write the file as a stream
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);
}
//Set the download completion to 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;
}
}
The above is all the content of this article, I hope you can enjoy it.