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本章记录三个，1.java 发送普通的邮件  2.java发送带附件的邮件 3.java发送带图片的邮件

1.java发送普通邮件–首先要设置如下的几个具体的参数：

public static String username = "***@163.com"; // 服务邮箱(from邮箱)
public static String password = "*****"; // 邮箱密码
public static String senderNick = "***";   // 发件人昵称
private Properties props; // 系统属性----下面会讲一下具体的配置。
private Session session; // 邮件会话对象
private MimeMessage mimeMsg; // MIME邮件对象
private MimeMultipart mp;   // Multipart对象,邮件内容,标题,附件，图片等内容均添加到其中后再生成MimeMessage对象

2.现在看一下系统属性Properties的属性应该如何配置：

 props = System.getProperties();
 props.put("mail.smtp.auth", "true"); //mail.smtp.auth属性或提供SMTP传输与连接到SMTP服务器的用户名和密码--如果需要用到用户验证即为TRUE
 props.put("mail.transport.protocol", "smtp");//协议
 props.put("mail.smtp.host", "*****");//传输邮件协议的服务器
 props.put("mail.smtp.port", "25");//邮件服务器的端口号
 props.put("username", username);//发出邮箱地址
 props.put("password", password);//发出邮箱密码
 props.put("mail.smtp.starttls.enable", "true");
 props.put("mail.smtp.ssl.trust", "*****");

3.接下来是配置seesion
 --对用户进行验证--然后将验证放入到session中，验证的方法如下
 MyAuthenticator myauth = new MyAuthenticator(senderNick, password);
 session = Session.getDefaultInstance(props, myauth);

4.用户验证的方法：---

class MyAuthenticator extends Authenticator {
    String userName = "";
    String password = "";

    public MyAuthenticator() {
    }

    public MyAuthenticator(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(userName, password);
    }
}

增加了3，4中的用户的验证，可以避免邮箱发送邮件，报Error:535 5.7.3 Authentication unsuccessful的问题。

5.接下来是填充邮件正文和图片方面：

mimeMsg = new MimeMessage(session);
mp = new MimeMultipart("related");

                // 自定义发件人昵称
                String nick = "";
                try {
                    nick = javax.mail.internet.MimeUtility.encodeText(senderNick);
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                // 设置发件人
                mimeMsg.setFrom(new InternetAddress(from, nick));--from 发件人的地址，昵称
                // 设置收件人
                if (to != null && to.length() > 0) {
                    mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
                }
                // 设置抄送人
                if (cc != null && cc.length() > 0) {
                    mimeMsg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
                }
                // 设置主题
                mimeMsg.setSubject(subject);

                //设置图片
                MimeBodyPart text = new MimeBodyPart();
                text.setContent("此邮件为系统自动发送<img src='cid:a'><img src='cid:b'>","text/html;charset=gb2312");
                MimeBodyPart img = new MimeBodyPart();
                DataHandler dh = new DataHandler(new FileDataSource("D://Chrysanthemum.jpg"));//图片路径
                img.setDataHandler(dh);
                img.setContentID("a");

                MimeBodyPart img2 = new MimeBodyPart();
                DataHandler dh2 = new DataHandler(new FileDataSource("d://Chrysanthemum.jpg"));//第二张图片路径
                img2.setDataHandler(dh2);
                img2.setContentID("b");

                MimeMultipart mm = new MimeMultipart();
                mm.addBodyPart(text);
                mm.addBodyPart(img);
                mm.setSubType("related");// 设置正文与图片之间的关系
                // 图班与正文的 body
                MimeBodyPart all = new MimeBodyPart();
                all.setContent(mm);
                MimeMultipart mm2 = new MimeMultipart();
                mm2.addBodyPart(all);
                mm2.addBodyPart(img2);
                mm2.setSubType("mixed");



                //设置附件：

                if (errorList != null && errorList.size() > 0) {
                   for (String file : errorList) {
                    contentPart = new MimeBodyPart();
                    FileDataSource source = new FileDataSource(file);
                    contentPart.setDataHandler(new DataHandler(source));
                    String[] imgname = file.replace(File.separator, ",").split(",");
                    int num = imgname.length - 1;
                    contentPart.setFileName(imgname[num]);
                    multipart.addBodyPart(contentPart);
                  }
               }

                mimeMsg.setContent(mm2);
                mimeMsg.saveChanges();
                // 发送邮件
                if (props.get("mail.smtp.auth").equals("true")) {
                    Transport transport = session.getTransport("smtp");
                    transport.connect((String)props.get("mail.smtp.host"), (String)props.get("username"), (String)props.get("password"));
                    transport.sendMessage(mimeMsg, mimeMsg.getAllRecipients());
                    transport.close();
                } else {
                    Transport.send(mimeMsg);
                }
                System.out.println("邮件发送成功");