用javamail发送附件

REF：http://coolshell.cn/articles/4261.html 有人封装了另一包，功能强大易用，不仅仅只能用来发送附件、html邮件，参考：http://jodd.org/doc/email.html

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Date;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

/*
 * from:    http://www.blogjava.net/rocky/archive/2005/11/03/18001.html
 * from:    http://blog.csdn.net/sunyujia/article/details/2528696
 * 邮件头(参见RFC822，RFC2047)只能包含US-ASCII字符。
邮件头中任何包含非US-ASCII字符的部分必须进行编码，使其只包含US-ASCII字符。
但是java mail可以根据JVM发送中文邮件自行编码，，用它自带的MimeUtility类的encodeText方法对中文信息进行编码也可以。
邮件正文必须有charset=gb2312否则为
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
打开邮件为乱码,设置charset=gb2312后
Content-Type: text/html;charset=gb2312
Content-Transfer-Encoding: quoted-printable
它不能用MimeUtility里的方法来编码。
邮件正文的编码方式的信息是要放在Content-Transfer-Encoding这个邮件头参数中的，
而MimeUtility里面的方法是将编码方式的信息放在编码后的正文内容中。
所以如果你对正文也用MimeUtility进行处理，那么其他邮件程序就不会正常显示你编码的邮件，
因为其他邮件软件如outlook,foxmail只会根据Content-Transfer-Encoding这个里面的信息来对邮件正文进行解码。*/

/**
 * <P>
 * Title:用java发送邮件的例子
 * </P>
 *
 * <P>
 * Description:发送图片附件并在html中使用该图片
 * </P>
 *
 * <P>
 * Copyright: Copyright (c) 2007
 * </P>
 *
 * @author 孙钰佳
 * @blog http://blog.csdn.net/sunyujia/
 * @main [email protected]
 * @date Jun 10, 2008 12:35:26 AM
 */
public class SendMail {
    private static String username = "[email protected]";
    private static String password = "ooxx";
    private static String smtpServer = "smtp.qq.com";
    private static String fromMailAddress = "[email protected]";
    private static String toMailAddress = "[email protected]";

    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.host", smtpServer);
        // 获得邮件会话对象
        Session session = Session.getDefaultInstance(props,
                new SmtpAuthenticator(username, password));
        /** *************************************************** */
        // 创建MIME邮件对象
        MimeMessage mimeMessage = new MimeMessage(session);
        mimeMessage.setFrom(new InternetAddress(fromMailAddress));// 发件人
        mimeMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(
                toMailAddress));// 收件人
        mimeMessage.setSubject("主题");
        mimeMessage.setSentDate(new Date());// 发送日期
        Multipart mp = new MimeMultipart("related");// related意味着可以发送html格式的邮件
        /** *************************************************** */
        BodyPart bodyPart = new MimeBodyPart();// 正文
        bodyPart.setDataHandler(new DataHandler("测<img src=\"cid:IMG1\" />试",
                "text/html;charset=GBK"));// 网页格式
        /** *************************************************** */
        BodyPart attachBodyPart = new MimeBodyPart();// 普通附件
        FileDataSource fds = new FileDataSource("C:\\Users\\desktop.ini");
        attachBodyPart.setDataHandler(new DataHandler(fds));
        attachBodyPart.setFileName("=?GBK?B?"
                + new sun.misc.BASE64Encoder().encode(fds.getName().getBytes())
                + "?=");// 解决附件名中文乱码
        mp.addBodyPart(attachBodyPart);
        /** *************************************************** */
        MimeBodyPart imgBodyPart = new MimeBodyPart(); // 附件图标
        byte[] bytes = readFile("C:\\Users\\decli\\Desktop\\button.gif");
        ByteArrayDataSource fileds = new ByteArrayDataSource(bytes,
                "application/octet-stream");
        imgBodyPart.setDataHandler(new DataHandler(fileds));
        imgBodyPart.setFileName("button.gif");
        imgBodyPart.setHeader("Content-ID", "<IMG1></IMG1>");// 在html中使用该图片方法src="cid:IMG1"
        mp.addBodyPart(imgBodyPart);
        /** *************************************************** */
        mp.addBodyPart(bodyPart);
        mimeMessage.setContent(mp);// 设置邮件内容对象
        Transport.send(mimeMessage);// 发送邮件

    }

    /**
     * 读取文件
     *
     * @param file
     *            文件路径
     * @return 返回二进制数组
     */
    public static byte[] readFile(String file) {
        FileInputStream fis = null;
        ByteArrayOutputStream bos = null;
        try {
            fis = new FileInputStream(file);
            bos = new ByteArrayOutputStream();
            int bytesRead;
            byte buffer[] = new byte[1024 * 1024];
            while ((bytesRead = fis.read(buffer)) != -1) {
                bos.write(buffer, 0, bytesRead);
                Arrays.fill(buffer, (byte) 0);
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        } finally {
            try {
                if (bos != null)
                    bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return bos.toByteArray();
    }
}

/**
 * Smtp认证
 */
class SmtpAuthenticator extends Authenticator {
    String username = null;
    String password = null;

    // SMTP身份验证
    public SmtpAuthenticator(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(this.username, this.password);
    }

}
class ByteArrayDataSource implements DataSource {

    private final String contentType;
    private final byte[] buf;
    private final int len;

    public ByteArrayDataSource(byte[] buf, String contentType) {
        this(buf, buf.length, contentType);
    }

    public ByteArrayDataSource(byte[] buf, int length, String contentType) {
        this.buf = buf;
        this.len = length;
        this.contentType = contentType;
    }

    public String getContentType() {
        if (contentType == null)
            return "application/octet-stream";
        return contentType;
    }

    public InputStream getInputStream() {
        return new ByteArrayInputStream(buf, 0, len);
    }

    public String getName() {
        return null;
    }

    public OutputStream getOutputStream() {
        throw new UnsupportedOperationException();
    }
}