jfmsmtp.java

java邮件源程序

	
	/*
	 * E-mail composer method.
	 */
	private String[] createEmailData(JfmEmail email) throws CoreException {
		Vector list=new Vector();
		/*
		 * Header: Adding E-mail subject.
		 */
		String x=new String("Subject: ");
		if (email.getEmailHeader().getSubject()==null ||
			email.getEmailHeader().getSubject().length()==0)
			throw new CoreException("COR_001:No E-mail subject");
		if (email.getEmailHeader().getSubjectCharset()==null ||
			email.getEmailHeader().getSubjectCharset().length()==0)
			x+=email.getEmailHeader().getSubject()+"\r\n";
		else x+=composeSubject(email.getEmailHeader().getSubject(),
												 email.getEmailHeader().getSubjectCharset())+"\r\n";
		list.addElement(x);
		/*
		 * Header: Adding E-mail sender.
		 */
		x=new String("From: ");
		if (email.getEmailHeader().getFrom()==null ||
			email.getEmailHeader().getFrom().length()==0)
			throw new CoreException("COR_001:No E-mail sender");
		x+=email.getEmailHeader().getFrom()+"\r\n";
		list.addElement(x);
		/*
		 * Header: Adding E-mail receivers.
		 */
		x=new String("To: ");
		if (email.getEmailHeader().getToCount()<=0)
			throw new CoreException("COR_001:No E-mail receiver");
		for(int i=0;i<email.getEmailHeader().getToCount();i++) {
			if (i==0) x+=email.getEmailHeader().getTo(i);
			else x+="; "+email.getEmailHeader().getTo(i);
		}
		x+="\r\n";
		list.addElement(x);
		if (email.getEmailHeader().getCCCount()>0) {
			/*
			 * Header: Adding E-mail CC list.
			 */
			x=new String("Cc: ");
			for(int i=0;i<email.getEmailHeader().getCCCount();i++) {
				if (i==0) x+=email.getEmailHeader().getCC(i);
				else x+="; "+email.getEmailHeader().getCC(i);
			}
			x+="\r\n";
			list.addElement(x);
		}
		/*
		 * Checking multipart/singlepart.
		 * If single part, this part must be text type.
		 * If multipart, we need to have at least one text part.
		 */
		boolean multipart=false;
		int parts=email.getEmailPartCount();
		if (parts<=0)
			throw new CoreException("COR_001:No E-mail part");
		if (parts==1 && !(email.getEmailPart(0) instanceof JfmEmailTextPart))
			throw new CoreException("COR_010:No plain text part of E-mail");
		boolean textpart=false;
		for(int i=0;i<parts;i++) if (email.getEmailPart(i) instanceof JfmEmailTextPart) textpart=true; 
		if (!textpart) throw new CoreException("COR_010:No plain text part of E-mail");
		x=new String("Content-Type: ");
		String boundary=new String();
		if (parts>1) {
			/*
			 * We compose multipart E-mail. Needs to calculate unique
			 * boundary and to setup content type for multipart/mixed.
			 */
			multipart=true;
			SimpleDateFormat sdf=new SimpleDateFormat("dd.MM.yy hh:mm:ss");
			String xdate=sdf.format(new Date());
			try {
				boundary="=Part_"+JfmCore.base64encode(xdate.getBytes())[0];
			} catch(IOException exc) {
				throw new CoreException("COR_009:Error encoding E-mail multipart boundary");
			}
			x+="multipart/mixed; boundary=\""+boundary+"\"\r\n";
		} else {
			/*
			 * We compose single part E-mail. No boundary, but we need
			 * to setup characterset in header.
			 */
			JfmEmailTextPart tpart=(JfmEmailTextPart)email.getEmailPart(0);
			x+=tpart.getContentType();
			if (tpart.getContentCharset().length()>0)
				x+="; charset=\""+tpart.getContentCharset()+"\"";
			x+="\r\n";
			list.addElement(x);
			x=new String("Content-Transfer-Encoding: "+tpart.getContentEncoding()+"\r\n");
		}
		/*
		 * Setting other properties in E-mail header.
		 */
		list.addElement(x);
		x=new String("Organization: \r\n");
		list.addElement(x);
		x=new String("Mime-Version: 1.0\r\n");
		list.addElement(x);
		String xdate=email.getEmailHeader().getEmailDateStr();
		x=new String("Date: ");
		x+=xdate+"\r\n";
		list.addElement(x);
		x=new String("X-Mailer: "+JfmConsts.XMAILER_STRING+"\r\n");
		list.addElement(x);
		x=new String("\r\n");
		list.addElement(x);
		if (!multipart) {
			/* We are composing singlepart E-mail. This kind of E-mail should
			 * contain only one text part.
			 */
			JfmEmailTextPart tpart=(JfmEmailTextPart)email.getEmailPart(0);
			String[] content=tpart.getContent();
			for(int i=0;i<content.length;i++) {
				/*
				 * Every line of this part should end with CRLF chars. So passed
				 * string array when creating E-mail needs to have strings with
				 * this chars.
				 */
				x=content[i];
				list.addElement(x);
			}
			x=new String("\r\n");
			list.addElement(x);
			x=new String(".\r\n");
			list.addElement(x);
		} else {
			/*
			 * Composing multipart E-mail. First we need to check type of part.
			 * Allso using boundary for parts.
			 */
			x=new String("--"+boundary+"\r\n");
			list.addElement(x);
			for(int i=0;i<email.getEmailPartCount();i++) {
				Object opart=email.getEmailPart(i);
				if (opart instanceof JfmEmailTextPart) {
					/*
					 * If this part is text type, add all in part header and add message
					 * lines. Message lines should be without CRLF signs, so are
					 * adding them here.
					 */
					JfmEmailTextPart part=(JfmEmailTextPart)opart;
					if (part.getContentCharset()==null ||
						part.getContentCharset().length()==0)
						throw new CoreException("COR_001:No E-mail part charset");
					x=new String("Content-Type: "+part.getContentType()+"; charset=\""+part.getContentCharset()+"\"\r\n");
					list.addElement(x);
					if (part.getContentEncoding()==null ||
						part.getContentEncoding().length()==0)
						throw new CoreException("COR_001:No E-mail part transfer encoding type");
					x=new String("Content-Transfer-Encoding: "+part.getContentEncoding()+"\r\n");		
					list.addElement(x);
					x=new String("\r\n");
					list.addElement(x);
					String[] message=part.getContent();
					for(int j=0;j<message.length;j++) {
						x=message[j];
						list.addElement(x);
					}
					x=new String("\r\n");
					list.addElement(x);
				} else if (opart instanceof JfmEmailBinaryPart) {
					/*
					 * Part we are composing is binary type. Setting up part header
					 * and them adding base64 encoded binary.
					 */
					JfmEmailBinaryPart part=(JfmEmailBinaryPart)opart;
					if (part.getContentName()==null ||
						part.getContentName().length()==0)
						throw new CoreException("COR_001:No E-mail binary content name");
					x=new String("Content-Disposition: attachment; filename=\""+part.getContentName()+"\"\r\n");
					list.addElement(x);
					x=new String("Content-Type: "+part.getContentType()+"; name=\""+part.getContentName()+"\"\r\n");
					list.addElement(x);
					if (part.getContentEncoding()==null ||
						part.getContentEncoding().length()==0)
						throw new CoreException("COR_001:No E-mail binary part transfer encoding type");
					x=new String("Content-Transfer-Encoding: "+part.getContentEncoding()+"\r\n");
					list.addElement(x);
					x=new String("\r\n");
					list.addElement(x);
					if (part.getContentEncoding().equals("base64")) {
						String[] att=null;
						try {
							att=JfmCore.base64encode(part.getContent());
						} catch(IOException exc) {
							throw new CoreException("COR_007:Error during encoding E-mail binary part");	
						}
						for(int j=0;j<att.length;j++) {
							x=att[j];
							list.addElement(x);
						}
					} else throw new CoreException("COR_006:Uknown binary data encoding:"+part.getContentEncoding());
					x=new String("\r\n");
					list.addElement(x);
				}
				if (opart instanceof JfmEmailTextPart ||
					opart instanceof JfmEmailBinaryPart) {
					if (i<(email.getEmailPartCount()-1)) x=new String("--"+boundary+"\r\n");
					else x=new String("--"+boundary+"--\r\n");
					list.addElement(x);
				}
			}
		}
		x=new String(".\r\n");
		list.addElement(x);
		
		String[] out_list=new String[list.size()];
		for(int i=0;i<list.size();i++) out_list[i]=(String)list.elementAt(i);
		return out_list;								 
	}
	
	/*
	 * Composing subject for E-mail header if used special characterset.
	 * Encoding in base64.
	 */
	private String composeSubject(String subject,String charset) throws CoreException {
		String out=new String("=?");
		out+=charset+"?B?";
		try {
			out+=JfmCore.base64encode(subject.getBytes())[0]+"?=";
		} catch(IOException exc) {
			throw new CoreException("COR_009:Error encoding E-mail subject");		
		}
		return out;
	}
}