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Simple Java client to talk to RESTful backends

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package us.monoid.web.mime;

import java.io.IOException;
import java.io.OutputStream;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;

import us.monoid.util.EncoderUtil;
import us.monoid.web.AbstractContent;

/** Content handler for multipart data of any shape (form, mixed, alternative)
 * 
 * @author beders
 *
 */
public class MultipartContent extends AbstractContent {
	private String subType;
	private List parts;
	private String boundary = "jb" + UUID.randomUUID().toString();		
	
	public MultipartContent(String aSubtype, AbstractContent... content) {
		subType = aSubtype;
		parts = new ArrayList(Arrays.asList(content));
	}
	
	protected void addContent(URLConnection con) throws IOException {
		con.setDoOutput(true);
		con.addRequestProperty("Content-Type", "multipart/" + subType + "; boundary=" + boundary);
		OutputStream os = con.getOutputStream();
		writeContent(os);
		os.close();
	}

	@Override
	public void writeContent(OutputStream os) throws IOException {
		if (parts.isEmpty()) return;
		for (AbstractContent c : parts) {
			os.write(ascii("--"));
			os.write(ascii(boundary));
			os.write(CRLF);
			c.writeHeader(os);
			os.write(CRLF);
			c.writeContent(os);
			os.write(CRLF);
		}
		os.write(ascii("--"));
		os.write(ascii(boundary));
		os.write(ascii("--"));
		os.write(CRLF);
	}


	@Override
	public void writeHeader(OutputStream os) throws IOException {
		os.write(ascii("Content-Type: multipart/" + subType + "; boundary=" + boundary + "\r\n"));
	}

}