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* http://www.apache.org/licenses/LICENSE-2.0 *
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package org.apache.james.mime4j.samples.dom;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Date;
import javax.imageio.ImageIO;
import org.apache.james.mime4j.dom.BinaryBody;
import org.apache.james.mime4j.dom.MessageWriter;
import org.apache.james.mime4j.dom.Multipart;
import org.apache.james.mime4j.dom.TextBody;
import org.apache.james.mime4j.field.address.AddressBuilder;
import org.apache.james.mime4j.message.BodyPart;
import org.apache.james.mime4j.message.MessageImpl;
import org.apache.james.mime4j.message.DefaultMessageWriter;
import org.apache.james.mime4j.message.MultipartImpl;
import org.apache.james.mime4j.storage.Storage;
import org.apache.james.mime4j.storage.StorageBodyFactory;
import org.apache.james.mime4j.storage.StorageOutputStream;
import org.apache.james.mime4j.storage.StorageProvider;
/**
* Creates a multipart/mixed message that consists of a text/plain and an
* image/png part. The image is created on the fly; a similar technique can be
* used to create PDF or XML attachments, for example.
*/
public class MultipartMessage {
public static void main(String[] args) throws Exception {
// 1) start with an empty message
MessageImpl message = new MessageImpl();
// 2) set header fields
// Date and From are required fields
message.setDate(new Date());
message.setFrom(AddressBuilder.DEFAULT.parseMailbox("John Doe <jdoe@machine.example>"));
// Message-ID should be present
message.createMessageId("machine.example");
// set some optional fields
message.setTo(AddressBuilder.DEFAULT.parseMailbox("Mary Smith <mary@example.net>"));
message.setSubject("An image for you");
// 3) set a multipart body
Multipart multipart = new MultipartImpl("mixed");
// a multipart may have a preamble
multipart.setPreamble("This is a multi-part message in MIME format.");
// first part is text/plain
StorageBodyFactory bodyFactory = new StorageBodyFactory();
BodyPart textPart = createTextPart(bodyFactory, "Why so serious?");
multipart.addBodyPart(textPart);
// second part is image/png (image is created on the fly)
BufferedImage image = renderSampleImage();
BodyPart imagePart = createImagePart(bodyFactory, image);
multipart.addBodyPart(imagePart);
// setMultipart also sets the Content-Type header field
message.setMultipart(multipart);
// 4) print message to standard output
MessageWriter writer = new DefaultMessageWriter();
writer.writeMessage(message, System.out);
// 5) message is no longer needed and should be disposed of
message.dispose();
}
/**
* Creates a text part from the specified string.
*/
private static BodyPart createTextPart(StorageBodyFactory bodyFactory, String text) {
// Use UTF-8 to encode the specified text
TextBody body = bodyFactory.textBody(text, "UTF-8");
// Create a text/plain body part
BodyPart bodyPart = new BodyPart();
bodyPart.setText(body);
bodyPart.setContentTransferEncoding("quoted-printable");
return bodyPart;
}
/**
* Creates a binary part from the specified image.
*/
private static BodyPart createImagePart(StorageBodyFactory bodyFactory,
BufferedImage image) throws IOException {
// Create a binary message body from the image
StorageProvider storageProvider = bodyFactory.getStorageProvider();
Storage storage = storeImage(storageProvider, image, "png");
BinaryBody body = bodyFactory.binaryBody(storage);
// Create a body part with the correct MIME-type and transfer encoding
BodyPart bodyPart = new BodyPart();
bodyPart.setBody(body, "image/png");
bodyPart.setContentTransferEncoding("base64");
// Specify a filename in the Content-Disposition header (implicitly sets
// the disposition type to "attachment")
bodyPart.setFilename("smiley.png");
return bodyPart;
}
/**
* Stores the specified image in a Storage object.
*/
private static Storage storeImage(StorageProvider storageProvider,
BufferedImage image, String formatName) throws IOException {
// An output stream that is capable of building a Storage object.
StorageOutputStream out = storageProvider.createStorageOutputStream();
// Write the image to our output stream. A StorageOutputStream can be
// used to create attachments using any API that supports writing a
// document to an output stream, e.g. iText's PdfWriter.
ImageIO.write(image, formatName, out);
// Implicitly closes the output stream and returns the data that has
// been written to it.
return out.toStorage();
}
/**
* Draws an image; unrelated to Mime4j.
*/
private static BufferedImage renderSampleImage() {
System.setProperty("java.awt.headless", "true");
final int size = 100;
BufferedImage img = new BufferedImage(size, size,
BufferedImage.TYPE_BYTE_GRAY);
Graphics2D gfx = img.createGraphics();
gfx.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
gfx.setStroke(new BasicStroke(size / 40f, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND));
gfx.setColor(Color.BLACK);
gfx.setBackground(Color.WHITE);
gfx.clearRect(0, 0, size, size);
int b = size / 30;
gfx.drawOval(b, b, size - 1 - 2 * b, size - 1 - 2 * b);
int esz = size / 7;
int ex = (int) (0.27f * size);
gfx.drawOval(ex, ex, esz, esz);
gfx.drawOval(size - 1 - esz - ex, ex, esz, esz);
b = size / 5;
gfx.drawArc(b, b, size - 1 - 2 * b, size - 1 - 2 * b, 200, 140);
return img;
}
}