servlet-download-file

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


download file

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(); 
   }
}