Coding Life

在使用Java mail之前要先下載Library

下載點：這裡

新增一個class加入以下程式碼，或者把下面程式碼包成jar，完成後將它import進你的程式中 

import java.io.File;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class JavaMail {
	private Properties props = new Properties();
	private MimeMessage message;
	private MimeBodyPart textPart = null;
	private MimeBodyPart picturePart = null;
	private MimeBodyPart filePart = null;
	private Address mailFrom;
	
	public JavaMail(String host, String protocol) throws NoSuchProviderException{
		this.setProperties(host, protocol);
		this.createMessage();
	}
	
	public void setProperties(String host, String protocol) throws NoSuchProviderException{
		this.props.setProperty("mail.host", host);
		this.props.setProperty("mail.transport.protocol", protocol);
		this.createMessage();
	}
	
	public void setUserInf(String name, String password) throws NoSuchProviderException{
		this.props.setProperty("mail.user", name);
        this.props.setProperty("mail.password", password);
        this.createMessage();
	}
	
	private void createMessage() throws NoSuchProviderException{
		Session mailSession = Session.getDefaultInstance(this.props, null);
        this.message = new MimeMessage(mailSession);
	}
	
	public void setSubject(String subject) throws MessagingException{
		this.message.setSubject(subject);
	}
	
	public void setText(String text) throws MessagingException{
        this.textPart = new MimeBodyPart();
        this.textPart.setContent(text, "text/html; charset=UTF-8");
	}
	
	public void setPicture(String path, String cid) throws MessagingException{
        this.picturePart = new MimeBodyPart();
        this.picturePart.setDataHandler(new DataHandler(new FileDataSource(path)));
        this.picturePart.setFileName(path);
        this.picturePart.setHeader("Content-ID", cid);
	}
	
	public void setAttFile(String path) throws MessagingException{
		if(path != null && path.length() > 0 && new File(path).exists()){
			this.filePart = new MimeBodyPart();
		    this.filePart.setDataHandler(new DataHandler(new FileDataSource(path)));
			this.filePart.setFileName(path);
		}
	}
	
	public void setMailFrom(String mailFrom) throws AddressException{
		this.mailFrom = new InternetAddress(mailFrom);	
	}
	
	public void send(String mailTo) throws MessagingException{
		Multipart multipart = new MimeMultipart();
		multipart.addBodyPart(this.textPart);
		if(this.picturePart != null) multipart.addBodyPart(this.picturePart);
		if(this.filePart != null) multipart.addBodyPart(this.filePart);

		this.message.setFrom(this.mailFrom);
        this.message.setContent(multipart);
        System.out.print("Mail to:" + mailTo + "...");
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
        Transport.send(message, message.getRecipients(Message.RecipientType.TO));
        System.out.println("OK");
	}
}

使用方法如下：

JavaMail mail = new JavaMail("mail server host or ip", "mail server protocol");
//如不需要名稱跟密碼，可省略。
mail.setUserInf("name", "password");
//傳送名稱
mail.setMailFrom("mail from");
//信件標題
mail.setSubject("mail title"));
//信件內容
mail.setText("xxxxxxxxx");
//附加圖片
mail.setPicture("file path", "Content-ID");
//附加檔案
mail.setAttFile("file path");
//設定收件者Address並傳送
mail.send("mail to");

可在信件內容直接輸入html語法，只要對方有支援就可直接顯示

如果要將圖片加入內容中必需注意content-id的設定

在內容中加入"<img src='cid:image'/>"

cid後面的image必需與setPicture中的Content-ID對應

另外…我只測試過公司的內部Mail Server，沒測過Gmail或Hotmail之類的，有需要的自行測試喔，我有空的話會再另外測試XP