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Hutool是一个小而全的Java工具类库,通过静态方法封装,降低相关API的学习成本,提高工作效率,使Java拥有函数式语言般的优雅,让Java语言也可以“甜甜的”。

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package cn.hutool.extra.mail;

import cn.hutool.core.builder.Builder;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.activation.FileTypeMap;
import javax.mail.Address;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.SendFailedException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import javax.mail.util.ByteArrayDataSource;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.nio.charset.Charset;
import java.util.Date;

/**
 * 邮件发送客户端
 *
 * @author looly
 * @since 3.2.0
 */
public class Mail implements Builder {
	private static final long serialVersionUID = 1L;

	/**
	 * 邮箱帐户信息以及一些客户端配置信息
	 */
	private final MailAccount mailAccount;
	/**
	 * 收件人列表
	 */
	private String[] tos;
	/**
	 * 抄送人列表(carbon copy)
	 */
	private String[] ccs;
	/**
	 * 密送人列表(blind carbon copy)
	 */
	private String[] bccs;
	/**
	 * 回复地址(reply-to)
	 */
	private String[] reply;
	/**
	 * 标题
	 */
	private String title;
	/**
	 * 内容
	 */
	private String content;
	/**
	 * 是否为HTML
	 */
	private boolean isHtml;
	/**
	 * 正文、附件和图片的混合部分
	 */
	private final Multipart multipart = new MimeMultipart();
	/**
	 * 是否使用全局会话,默认为false
	 */
	private boolean useGlobalSession = false;

	/**
	 * debug输出位置,可以自定义debug日志
	 */
	private PrintStream debugOutput;

	/**
	 * 创建邮件客户端
	 *
	 * @param mailAccount 邮件帐号
	 * @return Mail
	 */
	public static Mail create(MailAccount mailAccount) {
		return new Mail(mailAccount);
	}

	/**
	 * 创建邮件客户端,使用全局邮件帐户
	 *
	 * @return Mail
	 */
	public static Mail create() {
		return new Mail();
	}

	// --------------------------------------------------------------- Constructor start

	/**
	 * 构造,使用全局邮件帐户
	 */
	public Mail() {
		this(GlobalMailAccount.INSTANCE.getAccount());
	}

	/**
	 * 构造
	 *
	 * @param mailAccount 邮件帐户,如果为null使用默认配置文件的全局邮件配置
	 */
	public Mail(MailAccount mailAccount) {
		mailAccount = (null != mailAccount) ? mailAccount : GlobalMailAccount.INSTANCE.getAccount();
		this.mailAccount = mailAccount.defaultIfEmpty();
	}
	// --------------------------------------------------------------- Constructor end

	// --------------------------------------------------------------- Getters and Setters start

	/**
	 * 设置收件人
	 *
	 * @param tos 收件人列表
	 * @return this
	 * @see #setTos(String...)
	 */
	public Mail to(String... tos) {
		return setTos(tos);
	}

	/**
	 * 设置多个收件人
	 *
	 * @param tos 收件人列表
	 * @return this
	 */
	public Mail setTos(String... tos) {
		this.tos = tos;
		return this;
	}

	/**
	 * 设置多个抄送人(carbon copy)
	 *
	 * @param ccs 抄送人列表
	 * @return this
	 * @since 4.0.3
	 */
	public Mail setCcs(String... ccs) {
		this.ccs = ccs;
		return this;
	}

	/**
	 * 设置多个密送人(blind carbon copy)
	 *
	 * @param bccs 密送人列表
	 * @return this
	 * @since 4.0.3
	 */
	public Mail setBccs(String... bccs) {
		this.bccs = bccs;
		return this;
	}

	/**
	 * 设置多个回复地址(reply-to)
	 *
	 * @param reply 回复地址(reply-to)列表
	 * @return this
	 * @since 4.6.0
	 */
	public Mail setReply(String... reply) {
		this.reply = reply;
		return this;
	}

	/**
	 * 设置标题
	 *
	 * @param title 标题
	 * @return this
	 */
	public Mail setTitle(String title) {
		this.title = title;
		return this;
	}

	/**
	 * 设置正文
* 正文可以是普通文本也可以是HTML(默认普通文本),可以通过调用{@link #setHtml(boolean)} 设置是否为HTML * * @param content 正文 * @return this */ public Mail setContent(String content) { this.content = content; return this; } /** * 设置是否是HTML * * @param isHtml 是否为HTML * @return this */ public Mail setHtml(boolean isHtml) { this.isHtml = isHtml; return this; } /** * 设置正文 * * @param content 正文内容 * @param isHtml 是否为HTML * @return this */ public Mail setContent(String content, boolean isHtml) { setContent(content); return setHtml(isHtml); } /** * 设置文件类型附件,文件可以是图片文件,此时自动设置cid(正文中引用图片),默认cid为文件名 * * @param files 附件文件列表 * @return this */ public Mail setFiles(File... files) { if (ArrayUtil.isEmpty(files)) { return this; } final DataSource[] attachments = new DataSource[files.length]; for (int i = 0; i < files.length; i++) { attachments[i] = new FileDataSource(files[i]); } return setAttachments(attachments); } /** * 增加附件或图片,附件使用{@link DataSource} 形式表示,可以使用{@link FileDataSource}包装文件表示文件附件 * * @param attachments 附件列表 * @return this * @since 4.0.9 */ public Mail setAttachments(DataSource... attachments) { if (ArrayUtil.isNotEmpty(attachments)) { final Charset charset = this.mailAccount.getCharset(); MimeBodyPart bodyPart; String nameEncoded; try { for (DataSource attachment : attachments) { bodyPart = new MimeBodyPart(); bodyPart.setDataHandler(new DataHandler(attachment)); nameEncoded = attachment.getName(); if (this.mailAccount.isEncodefilename()) { nameEncoded = InternalMailUtil.encodeText(nameEncoded, charset); } // 普通附件文件名 bodyPart.setFileName(nameEncoded); if (StrUtil.startWith(attachment.getContentType(), "image/")) { // 图片附件,用于正文中引用图片 bodyPart.setContentID(nameEncoded); } this.multipart.addBodyPart(bodyPart); } } catch (MessagingException e) { throw new MailException(e); } } return this; } /** * 增加图片,图片的键对应到邮件模板中的占位字符串,图片类型默认为"image/jpeg" * * @param cid 图片与占位符,占位符格式为cid:${cid} * @param imageStream 图片文件 * @return this * @since 4.6.3 */ public Mail addImage(String cid, InputStream imageStream) { return addImage(cid, imageStream, null); } /** * 增加图片,图片的键对应到邮件模板中的占位字符串 * * @param cid 图片与占位符,占位符格式为cid:${cid} * @param imageStream 图片流,不关闭 * @param contentType 图片类型,null赋值默认的"image/jpeg" * @return this * @since 4.6.3 */ public Mail addImage(String cid, InputStream imageStream, String contentType) { ByteArrayDataSource imgSource; try { imgSource = new ByteArrayDataSource(imageStream, ObjectUtil.defaultIfNull(contentType, "image/jpeg")); } catch (IOException e) { throw new IORuntimeException(e); } imgSource.setName(cid); return setAttachments(imgSource); } /** * 增加图片,图片的键对应到邮件模板中的占位字符串 * * @param cid 图片与占位符,占位符格式为cid:${cid} * @param imageFile 图片文件 * @return this * @since 4.6.3 */ public Mail addImage(String cid, File imageFile) { InputStream in = null; try { in = FileUtil.getInputStream(imageFile); return addImage(cid, in, FileTypeMap.getDefaultFileTypeMap().getContentType(imageFile)); } finally { IoUtil.close(in); } } /** * 设置字符集编码 * * @param charset 字符集编码 * @return this * @see MailAccount#setCharset(Charset) */ public Mail setCharset(Charset charset) { this.mailAccount.setCharset(charset); return this; } /** * 设置是否使用全局会话,默认为true * * @param isUseGlobalSession 是否使用全局会话,默认为true * @return this * @since 4.0.2 */ public Mail setUseGlobalSession(boolean isUseGlobalSession) { this.useGlobalSession = isUseGlobalSession; return this; } /** * 设置debug输出位置,可以自定义debug日志 * * @param debugOutput debug输出位置 * @return this * @since 5.5.6 */ public Mail setDebugOutput(PrintStream debugOutput) { this.debugOutput = debugOutput; return this; } // --------------------------------------------------------------- Getters and Setters end @Override public MimeMessage build() { try { return buildMsg(); } catch (MessagingException e) { throw new MailException(e); } } /** * 发送 * * @return message-id * @throws MailException 邮件发送异常 */ public String send() throws MailException { try { return doSend(); } catch (MessagingException e) { if (e instanceof SendFailedException) { // 当地址无效时,显示更加详细的无效地址信息 final Address[] invalidAddresses = ((SendFailedException) e).getInvalidAddresses(); final String msg = StrUtil.format("Invalid Addresses: {}", ArrayUtil.toString(invalidAddresses)); throw new MailException(msg, e); } throw new MailException(e); } } // --------------------------------------------------------------- Private method start /** * 执行发送 * * @return message-id * @throws MessagingException 发送异常 */ private String doSend() throws MessagingException { final MimeMessage mimeMessage = buildMsg(); Transport.send(mimeMessage); return mimeMessage.getMessageID(); } /** * 构建消息 * * @return {@link MimeMessage}消息 * @throws MessagingException 消息异常 */ private MimeMessage buildMsg() throws MessagingException { final Charset charset = this.mailAccount.getCharset(); final MimeMessage msg = new MimeMessage(getSession()); // 发件人 final String from = this.mailAccount.getFrom(); if (StrUtil.isEmpty(from)) { // 用户未提供发送方,则从Session中自动获取 msg.setFrom(); } else { msg.setFrom(InternalMailUtil.parseFirstAddress(from, charset)); } // 标题 msg.setSubject(this.title, (null == charset) ? null : charset.name()); // 发送时间 msg.setSentDate(new Date()); // 内容和附件 msg.setContent(buildContent(charset)); // 收件人 msg.setRecipients(MimeMessage.RecipientType.TO, InternalMailUtil.parseAddressFromStrs(this.tos, charset)); // 抄送人 if (ArrayUtil.isNotEmpty(this.ccs)) { msg.setRecipients(MimeMessage.RecipientType.CC, InternalMailUtil.parseAddressFromStrs(this.ccs, charset)); } // 密送人 if (ArrayUtil.isNotEmpty(this.bccs)) { msg.setRecipients(MimeMessage.RecipientType.BCC, InternalMailUtil.parseAddressFromStrs(this.bccs, charset)); } // 回复地址(reply-to) if (ArrayUtil.isNotEmpty(this.reply)) { msg.setReplyTo(InternalMailUtil.parseAddressFromStrs(this.reply, charset)); } return msg; } /** * 构建邮件信息主体 * * @param charset 编码,{@code null}则使用{@link MimeUtility#getDefaultJavaCharset()} * @return 邮件信息主体 * @throws MessagingException 消息异常 */ private Multipart buildContent(Charset charset) throws MessagingException { final String charsetStr = null != charset ? charset.name() : MimeUtility.getDefaultJavaCharset(); // 正文 final MimeBodyPart body = new MimeBodyPart(); body.setContent(content, StrUtil.format("text/{}; charset={}", isHtml ? "html" : "plain", charsetStr)); this.multipart.addBodyPart(body); return this.multipart; } /** * 获取默认邮件会话
* 如果为全局单例的会话,则全局只允许一个邮件帐号,否则每次发送邮件会新建一个新的会话 * * @return 邮件会话 {@link Session} */ private Session getSession() { final Session session = MailUtil.getSession(this.mailAccount, this.useGlobalSession); if (null != this.debugOutput) { session.setDebugOut(debugOutput); } return session; } // --------------------------------------------------------------- Private method end }




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