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JDownloader.java
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JDownloader.java
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import java.util.Scanner;
import java.util.Formatter;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.RandomAccessFile;
import java.io.FileNotFoundException;
import java.io.File;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLDecoder;
import java.io.UnsupportedEncodingException;
class JDownloader {
public static void help(){
System.out.println(
"Syntax: JDownloader [options] <url_string>\n\n"+
"Options\n"+
"-------\n"+
" -c : continue download from where you left\n"+
" -h : show this help message\n"
);
}
public static void main(String [] args){
if(args.length<1){
help();
System.exit(1);
}
String urlstr = null;
boolean contnu = false;
for(int i=0;i<args.length;i++){
if(args[i].startsWith("-")){
if(args[i].equals("-c"))
contnu = true;
else if(args[i].equals("-h")){
help();
}
else{
System.err.println("wrong option");
System.exit(5);
}
}else{
urlstr = args[i];
}
}
if(urlstr == null){
System.exit(6);
}
Downloader download = new Downloader(urlstr);
if(contnu)
download.continueDownload();
else
download.startDownload();
}
}
class Downloader {
private String urlStr;
private URL urlObj;
private HttpURLConnection conn;
public Downloader(String urlData){
urlStr = urlData;
try {
// usring the url to create a http connection
urlObj = new URL(urlStr);
conn = (HttpURLConnection) urlObj.openConnection();
urlStr = URLDecoder.decode(urlStr,"UTF-8");
} catch(UnsupportedEncodingException e){
System.err.println("error in url");
System.exit(2);
} catch (MalformedURLException e){
System.err.println("wrong url");
System.exit(2);
} catch (Exception e){
System.err.println("connection error");
System.exit(3);
}
}
private String getSize(long num){
double doubleVal=(double)num;
Formatter fmt=new Formatter();
String ans="";
if(doubleVal < 1024)
return new String((int)doubleVal+" bytes");
doubleVal/=1024;
if(doubleVal < 10){
if(doubleVal != (int)doubleVal)
fmt.format("%4.2f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" KB";
} else if(doubleVal < 100){
if(doubleVal != (int)doubleVal)
fmt.format("%4.1f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" KB";
} else if(doubleVal < 1024){
fmt.format("%4d",(int)doubleVal);
return fmt+" KB";
}
doubleVal/=1024;
if(doubleVal < 10){
if(doubleVal != (int)doubleVal)
fmt.format("%4.2f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" MB";
} else if(doubleVal < 100){
if(doubleVal != (int)doubleVal)
fmt.format("%4.1f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" MB";
} else if(doubleVal < 1024){
fmt.format("%4d",(int)doubleVal);
return fmt+" MB";
}
doubleVal/=1024;
if(doubleVal < 10){
if(doubleVal != (int)doubleVal)
fmt.format("%4.2f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" GB";
} else if(doubleVal < 100){
if(doubleVal != (int)doubleVal)
fmt.format("%4.1f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" GB";
} else if(doubleVal < 1024){
fmt.format("%4d",(int)doubleVal);
return fmt+" GB";
}
doubleVal/=1024;
if(doubleVal < 10){
if(doubleVal != (int)doubleVal)
fmt.format("%4.2f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" TB";
} else if(doubleVal < 100){
if(doubleVal != (int)doubleVal)
fmt.format("%4.1f",doubleVal);
else
fmt.format("%4d",(int)doubleVal);
return fmt+" TB";
} else if(doubleVal < 1024){
fmt.format("4%d",(int)doubleVal);
return fmt+" TB";
}
return (int)doubleVal+" TB";
}
private int percent(long num,long denom){
float numerator=num;
float denominator=denom;
float fraction=numerator/denominator;
return (int)(fraction*100);
}
private String getFileName(String urlStr){
String name = urlStr.substring( urlStr.lastIndexOf('/')+1, urlStr.length() ).replace(' ','_');
return name;
}
public void startDownload(){
Runnable r = new Runnable() {
@Override
public void run() {
Scanner in = new Scanner(System.in);
long fileSize = conn.getContentLengthLong();
String oldFileName = getFileName(urlStr);
String newFileName = null;
// conn.setRequestMethod("GET");
// conn.setDoOutput(true);
File file = new File(oldFileName);
if(file.exists()){
System.out.print("\n"+oldFileName+" already exists\nDo you want to overwrite(y/n) : ");
char ans=in.next().charAt(0);
if(ans != 'y' && ans != 'Y'){
System.out.print("Do you want to give it a new name(y/n) : ");
ans=in.next().charAt(0);
if(ans == 'y' || ans == 'Y'){
System.out.print("Enter file name : ");
newFileName=in.next();
}else{
System.err.println("aborted");
System.exit(4);
}
}
}
if(newFileName == null)
newFileName = oldFileName;
System.out.println("downloading: "+newFileName +" ("+getSize(fileSize)+")");
// int requestInfo = conn.getResponseCode();
try {
// reading from the connection
BufferedInputStream buffInput = new BufferedInputStream(conn.getInputStream());
// writing the data to the file
FileOutputStream fileOutput = new FileOutputStream(newFileName);
file = new File(newFileName);
int len = 0;
byte[] buff = new byte[1024];
len = buffInput.read(buff);
long start,end;
start = System.currentTimeMillis();
System.out.println();
System.out.print( getSize(file.length())+"/"+getSize(fileSize)+" ["+percent(file.length(),fileSize)+"%]" );
while (len != -1){
fileOutput.write(buff,0,len);
len = buffInput.read(buff);
end=System.currentTimeMillis();
if(end-start >= 100){
start=end;
System.out.print( "\r"+getSize(file.length())+"/"+getSize(fileSize)+" ["+percent(file.length(),fileSize)+"%]" );
}
}
System.out.print( "\r"+getSize(file.length())+"/"+getSize(fileSize)+" ["+percent(file.length(),fileSize)+"%]\n" );
fileOutput.flush();
fileOutput.close();
buffInput.close();
System.out.println("download complete...");
} catch (IOException e) {
System.err.println("error occured");
}
}
};
Thread subThread = new Thread(r);
subThread.start();
}
public void continueDownload(){
Runnable r = new Runnable() {
@Override
public void run(){
long fileSize = conn.getContentLengthLong();
String fileName = getFileName(urlStr);
File file = new File(fileName);
try {
// reading from the connection
BufferedInputStream buffInput = new BufferedInputStream(conn.getInputStream());
long bytesToDownload;
int len = 0;
long downloaded = 0;
byte[] buff = new byte[1024];
if(file.exists()){
long bytesToSkip = buffInput.skip(file.length());
RandomAccessFile fileOutput = new RandomAccessFile(file,"rw");
fileOutput.seek(bytesToSkip);
bytesToDownload = fileSize - bytesToSkip;
System.out.println("downloading: "+getSize(bytesToDownload)+" of "+getSize(fileSize));
len = buffInput.read(buff);
downloaded += len;
long start,end;
start = System.currentTimeMillis();
System.out.println();
System.out.print( getSize(downloaded)+"/"+getSize(bytesToDownload)+" ["+percent(0,bytesToDownload)+"%]" );
while (len != -1){
fileOutput.write(buff,0,len);
len = buffInput.read(buff);
downloaded += len;
end=System.currentTimeMillis();
if(end-start >= 100){
start=end;
System.out.print( "\r"+getSize(downloaded)+"/"+getSize(bytesToDownload)+" ["+percent(downloaded,bytesToDownload)+"%]" );
}
}
downloaded++;
System.out.print( "\r"+getSize(downloaded)+"/"+getSize(bytesToDownload)+" ["+percent(downloaded,bytesToDownload)+"%]\n" );
fileOutput.close();
buffInput.close();
System.out.println("download complete...");
}else{
FileOutputStream fileOutput = new FileOutputStream(fileName);
bytesToDownload = fileSize;
System.out.println("file not found\ndownloading entire file");
System.out.println("downloading: "+getSize(bytesToDownload)+" of "+getSize(fileSize));
len = buffInput.read(buff);
downloaded += len;
long start,end;
start = System.currentTimeMillis();
System.out.println();
System.out.print( getSize(downloaded)+"/"+getSize(bytesToDownload)+" ["+percent(downloaded,bytesToDownload)+"%]" );
while (len != -1){
fileOutput.write(buff,0,len);
len = buffInput.read(buff);
downloaded += len;
end=System.currentTimeMillis();
if(end-start >= 100){
start=end;
System.out.print( "\r"+getSize(downloaded)+"/"+getSize(bytesToDownload)+"\t["+percent(downloaded,bytesToDownload)+"%]" );
}
}
downloaded++;
System.out.print( "\r"+getSize(downloaded)+"/"+getSize(bytesToDownload)+"\t["+percent(downloaded,bytesToDownload)+"%]\n" );
fileOutput.flush();
fileOutput.close();
buffInput.close();
System.out.println("download complete...");
}
} catch(FileNotFoundException e){
System.out.println("file not found");
} catch (IOException e){
System.err.println("error occured");
}
}
};
Thread subThread = new Thread(r);
subThread.start();
}
}