?? lownloadfilethread.java
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import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JTextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class LownLoadFileThread extends Thread{
private JProgressBar jProgressBar;
String URL;
long startPos;
long endPos;
int threadID;
JTextArea textArea=new JTextArea();
RandomAccessFile file;
private int readPos = 0;
private int in = 0;
public LownLoadFileThread(String URL,long startPos,long endPos,int id,JTextArea textArea
,JProgressBar jProgressBar,String saveURL)throws IOException{
this.jProgressBar = jProgressBar;
this.URL = URL;
this.startPos = startPos;
this.endPos = endPos;
this.threadID = id;
this.textArea = textArea;
file=new RandomAccessFile(saveURL,"rw");
file.seek(startPos);
}
public void run(){
//DownLoad download = new DownLoad();
try{
URL url = new URL(URL);
HttpURLConnection httpConnection=(HttpURLConnection)url.openConnection();
String sProperty="bytes="+startPos+"-";
httpConnection.setRequestProperty("RANGE",sProperty);
// System.out.println("線程"+threadID+"下載文件、、、請等待");
textArea.append("\n 線程"+threadID+"下載文件、、、請等待");
InputStream input=httpConnection.getInputStream();
byte[] buf=new byte[1024];
int offset;
offset=(int)endPos-(int)startPos;
if(offset>1024)
offset=1024;
while((in = input.read(buf,0,offset))>0 && startPos<endPos)
{ if(((int) endPos - (int) startPos)<1024)
in = (int) endPos - (int) startPos;
/*if(in<1024){
System.out.println("in is :"+in+" -- startpos is "+startPos);
}*/
readPos +=in;
//System.out.println("已讀取"+in+"個字節。");
textArea.append("\n 線程"+threadID+" 已讀取"+readPos+"個字節, start is :"+startPos+" and end is:"+endPos+"。");
offset = (int) endPos - (int) startPos;
if (offset > 1024)
offset = 1024;
// System.out.println("threadID: "+threadID+" started: "+startPos+" offset: "+offset);
file.write(buf,0,in);
startPos+=in;
}
// System.out.println("線程"+threadID+"下載完畢!!");
textArea.append("\n 線程"+threadID+"下載完畢!!");
file.close();
input.close();
}catch(Exception ex){
}
}
public int getReadPos() {
return readPos;
}
public void setReadPos(int readPos) {
this.readPos = readPos;
}
}
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