关于使用JavaMail发送邮件

  1 import lombok.extern.slf4j.Slf4j;
  2 import org.apache.commons.lang3.StringUtils;
  3 
  4 import javax.activation.DataHandler;
  5 import javax.activation.FileDataSource;
  6 import javax.mail.Address;
  7 import javax.mail.Message;
  8 import javax.mail.Session;
  9 import javax.mail.Transport;
 10 import javax.mail.internet.*;
 11 import java.util.Date;
 12 import java.util.Properties;
 13 
 14 /**
 15  * @author <a herf="mailto:[email protected]">yanwu</a>
 16  * @date 2019-10-22 14:17.
 17  * <p>
 18  * description: 邮件工具类
 19  */
 20 @Slf4j
 21 public class EmailUtil {
 22     /*** 发件人地址 */
 23     private static final String SEND_ADDRESS = "[email protected]";
 24     /*** 发件人账户名 */
 25     private static final String ACCOUNT = "[email protected]";
 26     /*** 发件人账户密码[注：此密码不是邮箱登陆密码，而是邮箱授权密码] */
 27     private static final String PASSWORD = "xxxxxxx";
 28 
 29     private static final String UTF_8 = "UTF-8";
 30     private static final String CONTENT_TYPE = "text/html;charset=UTF-8";
 31 
 32     /*** 连接邮件服务器的参数配置 */
 33     private static final Properties PROPERTIES;
 34 
 35     static {
 36         PROPERTIES = new Properties();
 37         // ----- 设置用户的认证方式
 38         PROPERTIES.setProperty("mail.smtp.auth", "true");
 39         // ----- 设置传输协议
 40         PROPERTIES.setProperty("mail.transport.protocol", "smtp");
 41         // ----- 设置发件人的SMTP服务器地址
 42         PROPERTIES.setProperty("mail.smtp.host", "smtp.qq.com");
 43     }
 44 
 45     public static void main(String[] args) throws Exception {
 46         String toRecipient = "[email protected]";
 47         String[] ccRecipient = {"[email protected]", "[email protected]"};
 48         String subject = "测试邮件";
 49         String content = "尊敬的用户：[email protected]，您的车票已经抢票成功！信息如下:乘客:xx,日期:xxxx-xx-xx,车次:xxx,地点:杭州xx:xx-合肥xx:xx,席别:硬座。请在30分钟内完成付款！更多信息请查询未付款订单。";
 50         String[] attachments = {"F:\\compression\\base_menu.sql", "E:\\log\\tcp-client.log"};
 51         sendEmail(toRecipient, ccRecipient, subject, content, attachments);
 52     }
 53 
 54     /**
 55      * 发送邮件[使用默认的发件人信息]
 56      *
 57      * @param toRecipient 接收人地址
 58      * @param ccRecipient 抄送人地址 [为null则不抄送]
 59      * @param subject     主题
 60      * @param content     内容
 61      * @param attachments 附件 [为null则表示无附件]
 62      * @throws Exception
 63      */
 64     public static void sendEmail(String toRecipient, String[] ccRecipient,
 65                                  String subject, String content, String... attachments) throws Exception {
 66         sendEmail(SEND_ADDRESS, ACCOUNT, PASSWORD, toRecipient, ccRecipient, subject, content, attachments);
 67     }
 68 
 69     /**
 70      * 发送邮件[使用指定的发件人信息]
 71      *
 72      * @param sendAddress 发送人地址
 73      * @param account     发送人账号
 74      * @param password    发送人密码
 75      * @param toRecipient 接收人地址
 76      * @param ccRecipient 抄送人地址 [为null则不抄送]
 77      * @param subject     主题
 78      * @param content     内容
 79      * @param attachments 附件 [为null则表示无附件]
 80      * @throws Exception
 81      */
 82     public static void sendEmail(String sendAddress, String account, String password,
 83                                  String toRecipient, String[] ccRecipient,
 84                                  String subject, String content, String... attachments) throws Exception {
 85         log.info("发送人: [{}], 接收人: [{}], 抄送人: {}, 主题: [{}], 内容: [{}], 附件: {}", sendAddress, toRecipient, ccRecipient, subject, content, attachments);
 86         // ===== 参数校验
 87         checkParam(sendAddress, "sender address cannot be empty!");
 88         checkParam(account, "sender account cannot be empty!");
 89         checkParam(password, "sender password cannot be empty!");
 90         checkParam(toRecipient, "recipient address cannot be empty!");
 91         checkParam(subject, "mail subject cannot be empty!");
 92         checkParam(content, "mail content cannot be empty!");
 93         // ===== 创建定义整个应用程序所需的环境信息的 Session 对象
 94         Session session = Session.getInstance(PROPERTIES);
 95         // ===== 创建邮件的实例对象
 96         Message msg = getMimeMessage(session, sendAddress, toRecipient, ccRecipient, subject, content, attachments);
 97         // ===== 根据session对象获取邮件传输对象Transport
 98         Transport transport = session.getTransport();
 99         // ----- 设置发件人的账户名和密码
100         transport.connect(account, password);
101         // ----- 发送邮件，并发送到所有收件人地址，message.getAllRecipients() 获取到的是在创建邮件对象时添加的所有收件人, 抄送人, 密送人
102         transport.sendMessage(msg, msg.getAllRecipients());
103         // ===== 关闭邮件连接
104         transport.close();
105     }
106 
107     /**
108      * 获得创建一封邮件的实例对象
109      *
110      * @param session     session
111      * @param sendAddress 发送人地址
112      * @param toRecipient 接收人地址
113      * @param ccRecipient 抄送人地址
114      * @param subject     主题
115      * @param content     内容
116      * @param attachments 附件
117      * @return 邮件的实例对象
118      * @throws Exception
119      */
120     private static MimeMessage getMimeMessage(Session session, String sendAddress,
121                                               String toRecipient, String[] ccRecipient,
122                                               String subject, String content, String... attachments) throws Exception {
123         // ----- 创建一封邮件的实例对象
124         MimeMessage msg = new MimeMessage(session);
125         // ===== 发件人地址
126         msg.setFrom(new InternetAddress(sendAddress));
127         // ===== 收件人地址
128         msg.setRecipients(MimeMessage.RecipientType.TO, toRecipient);
129         if (ArrayUtil.isNotEmpty(ccRecipient)) {
130             // ----- 抄送人
131             Address[] addresses = new InternetAddress[ccRecipient.length];
132             for (int i = 0; i < ccRecipient.length; i++) {
133                 String cc = ccRecipient[i];
134                 checkParam(cc, "Cc address cannot be empty!");
135                 addresses[i] = new InternetAddress(cc);
136             }
137             msg.setRecipients(MimeMessage.RecipientType.CC, addresses);
138         }
139         // ===== 邮件主题
140         msg.setSubject(subject, UTF_8);
141         // ===== 邮件处理附件
142         if (ArrayUtil.isEmpty(attachments)) {
143             // ----- 邮件正文
144             msg.setContent(content, CONTENT_TYPE);
145         } else {
146             // ----- 附件
147             MimeMultipart mm = new MimeMultipart();
148             // ----- 邮件正文
149             MimeBodyPart text = new MimeBodyPart();
150             text.setContent(content, CONTENT_TYPE);
151             mm.addBodyPart(text);
152             // ----- 处理附件
153             for (String path : attachments) {
154                 if (StringUtils.isBlank(path)) {
155                     continue;
156                 }
157                 // ===== 创建附件节点
158                 MimeBodyPart attachment = new MimeBodyPart();
159                 // ----- 读取本地文件
160                 DataHandler dh = new DataHandler(new FileDataSource(path));
161                 // ----- 将附件数据添加到节点
162                 attachment.setDataHandler(dh);
163                 // ----- 设置附件的文件名（需要编码）
164                 attachment.setFileName(MimeUtility.encodeText(dh.getName(), UTF_8, null));
165                 mm.addBodyPart(attachment);
166             }
167             mm.setSubType("mixed");
168             msg.setContent(mm);
169         }
170         // ----- 设置邮件的发送时间,默认立即发送
171         msg.setSentDate(new Date());
172         return msg;
173     }
174 
175     /**
176      * 参数校验
177      *
178      * @param str 参数
179      * @param msg 异常信息
180      */
181     private static void checkParam(String str, String msg) {
182         if (StringUtils.isBlank(str)) {
183             throw new RuntimeException(msg);
184         }
185     }
186 }