downloadimage.java

flex paint flex paint flex paint

package org.flex.flexpaint;

import java.io.DataInputStream;
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 DownloadImage extends HttpServlet
{

    private static final long serialVersionUID = -1182898708844757070L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        doDownload(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        doDownload(request, response);
    }
    
    private void doDownload(HttpServletRequest req, HttpServletResponse resp)
        throws IOException
    {
        long fileId = Long.parseLong(req.getParameter("fileId"));
        File f = new File(System.getProperty("java.io.tmpdir") + "/" + fileId +
            ".png");
        ServletOutputStream op = resp.getOutputStream();

        resp.setContentType("image/png");
        resp.setContentLength( (int)f.length() );

        byte[] bbuf = new byte[2048];
        DataInputStream in = new DataInputStream(new FileInputStream(f));

        int length = 0;
        while ((in != null) && ((length = in.read(bbuf)) != -1))
        {
            op.write(bbuf,0,length);
        }

        in.close();
        op.flush();
        op.close();
    }
    
}