Java Code House

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

@WebServlet("/a/b/download")
public class Downloader extends HttpServlet{

    @Override
    public void doGet(HttpServletRequest req,HttpServletResponse res){
        res.setContentType("application/pdf"); //setting MIME type
        ServletContext ctx = getServletContext();
        
        try{
            //getting stream to file
            InputStream is = ctx.getResourceAsStream("/ALG_3rd.pdf");
            int read = 0;
            byte[] bytes = new byte[1024]; //setting buffer
            OutputStream os = res.getOutputStream();  //getting stream

            while ((read = is.read(bytes)) != -1) //reading file
               os.write(bytes, 0, read);  //writing to stream

            os.flush();  //closing streams
            os.close();
        }catch(Exception e){}
    }
}