Java tutorial
import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class SendMp3 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String fileName = (String) request.getParameter("file"); if (fileName == null || fileName.equals("")) throw new ServletException("Invalid or non-existent file parameter in SendMp3 servlet."); if (fileName.indexOf(".mp3") == -1) fileName = fileName + ".mp3"; String mp3Dir = getServletContext().getInitParameter("mp3-dir"); if (mp3Dir == null || mp3Dir.equals("")) throw new ServletException("Invalid or non-existent mp3Dir context-param."); ServletOutputStream stream = null; BufferedInputStream buf = null; try { stream = response.getOutputStream(); File mp3 = new File(mp3Dir + "/" + fileName); //set response headers response.setContentType("audio/mpeg"); response.addHeader("Content-Disposition", "attachment; filename=" + fileName); response.setContentLength((int) mp3.length()); FileInputStream input = new FileInputStream(mp3); buf = new BufferedInputStream(input); int readBytes = 0; //read from the file; write to the ServletOutputStream while ((readBytes = buf.read()) != -1) stream.write(readBytes); } catch (IOException ioe) { throw new ServletException(ioe.getMessage()); } finally { if (stream != null) stream.close(); if (buf != null) buf.close(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }