servlet-download example (it can run)

inf : http://www.mkyong.com/servlet/servlet-code-to-download-text-file-from-website-java/

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletDownloadDemo extends HttpServlet{

  private static final int BYTES_DOWNLOAD = 1024;

  public void doGet(HttpServletRequest request,
   HttpServletResponse response) throws IOException{
response.setContentType("text/plain");
response.setHeader("Content-Disposition",
                     "attachment;filename=downloadname.txt");
ServletContext ctx = getServletContext();
InputStream is = ctx.getResourceAsStream("/testing.txt");

int read=0;
byte[] bytes = new byte[BYTES_DOWNLOAD];
OutputStream os = response.getOutputStream();

while((read = is.read(bytes))!= -1){
os.write(bytes, 0, read);
}
os.flush();
os.close();
   }
}