Attachment from a byte[]

Question

Hello everybody!
I have my files in database, and I need to send it like an attachment using javaMail.
I do:
DataSource source = new FileDataSource("fileName");
messageBodyPart.setDataHandler(new DataHandler(source));
But, my file isn't on disk, I have it like a byte[], becouse I extract it from database.
Any idea?

Answer 1

Hello
I solved it, I made a new class for implements a DataSource whith a constructor with byte[] como argument.
I post it for somebody have the same problem:
import java.io.*;
import javax.activation.*;
* Esta clase implementa un DataSource para un byte[]
* @author elveru
public class ByteArrayDataSource implements DataSource {
private byte[] data;     // data
private String type;     // content-type
public ByteArrayDataSource(byte[] data, String type) {
this.data = data;
     this.type = type;
//M�todos necesarios para implementar el DataSource:
public InputStream getInputStream() throws IOException {
     if (data == null)
     throw new IOException("No hay datos");
     return new ByteArrayInputStream(data);
public OutputStream getOutputStream() throws IOException {
     throw new IOException("Esto no se puede");
public String getContentType() {
return type;
public String getName() {
return "elveru";
With this class in my package, I can do:
DataSource source=new ByteArrayDataSource(varArrayBytes,"application/xxx" );
messageBodyPart.setDataHandler(new DataHandler(source));