基于SMTP发送一个简单的邮件
首先，需要一个认证器：
package No001_基于SMTP的文本邮件; import javax.mail.Authenticator; import javax.mail.PasswordAuthentication; public class SimpleAuthenticator extends Authenticator { private String username; private String password; public SimpleAuthenticator(String username, String password) { super(); this.username = username; this.password = password; } protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }
然后，书写简单的发送邮件程序：
package No001_基于SMTP的文本邮件; import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.AddressException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class SMTPSimpleMail { public static void main(String[] args) throws AddressException, MessagingException { /* 必需的信息 */ String SMTP_MAIL_HOST = "smtp.163.com"; // 此邮件服务器地址，自行去所属邮件查询 String EMAIL_USERNAME = "example_email@163.com"; String EMAIL_PASSWORD = "mypassword"; String TO_EMAIL_ADDRESS = "example_email_too@qq.com"; /* 服务器信息 */ Properties props = new Properties(); props.put("mail.smtp.host", SMTP_MAIL_HOST); props.put("mail.smtp.auth", "true"); /* 创建Session */ Session session = Session.getDefaultInstance(props, new SimpleAuthenticator(EMAIL_USERNAME, EMAIL_PASSWORD)); /* 邮件信息 */ MimeMessage message = new MimeMessage(session); message.setFrom(new InternetAddress(EMAIL_USERNAME)); message.addRecipient(Message.RecipientType.TO, new InternetAddress(TO_EMAIL_ADDRESS)); message.setSubject("how to use java mail to send email.(Title)(001)"); message.setText("how to use java mail to send email.(Content)"); // 发送 Transport.send(message); System.out.println("不是特别倒霉，你可以去查收邮件了。"); } }
各种收件人、抄送人、秘密抄送人，怎么办
认证器沿用，略。
其实就是设置、追加多个收件人、抄送人、秘密抄送人：
package No002_各种发件人收件人抄送人怎么办; import java.io.UnsupportedEncodingException; import java.util.Properties; import javax.mail.Address; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.AddressException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class SendMailWithMultiPeople { public static void main(String[] args) throws AddressException, MessagingException, UnsupportedEncodingException { /* 必需的信息 */ String SMTP_MAIL_HOST = "smtp.163.com"; // 此邮件服务器地址，自行去所属邮件查询 String EMAIL_USERNAME = "example@163.com"; String EMAIL_PASSWORD = "mypassword"; String TO_EMAIL_ADDRESS_1 = "example@163.com"; String CC_EMAIL_ADDRESS_1 = "example@163.com"; String BCC_EMAIL_ADDRESS_1 = "example@163.com"; /* 服务器信息 */ Properties props = new Properties(); props.put("mail.smtp.host", SMTP_MAIL_HOST); props.put("mail.smtp.auth", "true"); /* 创建Session */ Session session = Session.getDefaultInstance(props, new SimpleAuthenticator(EMAIL_USERNAME, EMAIL_PASSWORD)); /* 发件人 */ Address[] senderArray = new Address[1]; senderArray[0] = new InternetAddress("example@163.com", "Nick Huang"); /* 邮件信息 */ MimeMessage message = new MimeMessage(session); message.addFrom(senderArray); message.addRecipient(Message.RecipientType.TO, new InternetAddress(TO_EMAIL_ADDRESS_1)); message.addRecipient(Message.RecipientType.TO, new InternetAddress(CC_EMAIL_ADDRESS_1)); message.addRecipient(Message.RecipientType.CC, new InternetAddress(CC_EMAIL_ADDRESS_1)); message.addRecipient(Message.RecipientType.CC, new InternetAddress(TO_EMAIL_ADDRESS_1)); message.addRecipient(Message.RecipientType.BCC, new InternetAddress(BCC_EMAIL_ADDRESS_1)); message.setSubject("我是一封学习Java Mail的邮件"); message.setText("我是一封学习Java Mail的邮件的内容，请邮件过滤器高抬贵手。"); // 发送 Transport.send(message); System.out.println("不是特别倒霉，你可以去查收邮件了。"); } }
发送附件怎么办
认证器沿用，略。
发送附件demo：
package No003_发送附件怎么办; import java.io.File; import java.io.UnsupportedEncodingException; import java.util.Properties; import javax.activation.DataHandler; import javax.activation.DataSource; import javax.activation.FileDataSource; import javax.mail.Address; import javax.mail.BodyPart; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; 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 SendMailWithAttachment { public static void main(String[] args) throws AddressException, MessagingException, UnsupportedEncodingException { /* 必需的信息 */ String SMTP_MAIL_HOST = "smtp.163.com"; // 此邮件服务器地址，自行去所属邮件查询 String EMAIL_USERNAME = "example@163.com"; String EMAIL_PASSWORD = "password"; String TO_EMAIL_ADDRESS_1 = "example@163.com"; /* 服务器信息 */ Properties props = new Properties(); props.put("mail.smtp.host", SMTP_MAIL_HOST); props.put("mail.smtp.auth", "true"); /* 创建Session */ Session session = Session.getDefaultInstance(props, new SimpleAuthenticator(EMAIL_USERNAME, EMAIL_PASSWORD)); /* 发件人 */ Address[] senderArray = new Address[1]; senderArray[0] = new InternetAddress(EMAIL_USERNAME); /* 邮件信息 */ MimeMessage message = new MimeMessage(session); message.addFrom(senderArray); message.addRecipient(Message.RecipientType.TO, new InternetAddress(TO_EMAIL_ADDRESS_1)); message.setSubject("我是一封学习Java Mail的邮件"); BodyPart bodyPart = new MimeBodyPart(); bodyPart.setText("这是一封学习Java Mail的邮件的内容，请邮件过滤器高抬贵手。"); /* 附件 */ BodyPart attachmentPart1 = new MimeBodyPart(); DataSource source = new FileDataSource(new File("D:/文件壹.txt")); attachmentPart1.setDataHandler(new DataHandler(source)); attachmentPart1.setFileName("=" + new sun.misc.BASE64Encoder().encode("文件壹.txt".getBytes()) + ""); BodyPart attachmentPart2 = new MimeBodyPart(); source = new FileDataSource(new File("D:/文件贰.txt")); attachmentPart2.setDataHandler(new DataHandler(source)); attachmentPart2.setFileName("=" + new sun.misc.BASE64Encoder().encode("文件贰.txt".getBytes()) + ""); Multipart multipart = new MimeMultipart(); multipart.addBodyPart(bodyPart); multipart.addBodyPart(attachmentPart1); multipart.addBodyPart(attachmentPart2); message.setContent(multipart); // 发送 Transport.send(message); System.out.println("不是特别倒霉，你可以去查收邮件了。"); } }
还有，发送HTML邮件
认证器沿用，略。
其实就是告诉收件客户端用HTML解析渲染：
package No004_发送HTML邮件; import java.io.UnsupportedEncodingException; import java.util.Properties; import javax.mail.Address; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; 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 HowToSendHTMLMail { public static void main(String[] args) throws AddressException, MessagingException, UnsupportedEncodingException { /* 必需的信息 */ String SMTP_MAIL_HOST = "smtp.163.com"; // 此邮件服务器地址，自行去所属邮件查询 String EMAIL_USERNAME = "example@163.com"; String EMAIL_PASSWORD = "password"; String TO_EMAIL_ADDRESS_1 = "example@163.com"; /* 服务器信息 */ Properties props = new Properties(); props.put("mail.smtp.host", SMTP_MAIL_HOST); props.put("mail.smtp.auth", "true"); /* 创建Session */ Session session = Session.getDefaultInstance(props, new SimpleAuthenticator(EMAIL_USERNAME, EMAIL_PASSWORD)); /* 发件人 */ Address[] senderArray = new Address[1]; senderArray[0] = new InternetAddress(EMAIL_USERNAME); /* 邮件信息 */ MimeMessage message = new MimeMessage(session); message.addFrom(senderArray); message.addRecipient(Message.RecipientType.TO, new InternetAddress(TO_EMAIL_ADDRESS_1)); message.setSubject("如何发送HTML的邮件"); /* 正文 */ MimeBodyPart bodyPart = new MimeBodyPart(); bodyPart.setContent("<h1>loving you...</h2>", "text/html;charset=gb2312"); /* 封装邮件各部分信息 */ Multipart multipart = new MimeMultipart(); multipart.addBodyPart(bodyPart); message.setContent(multipart); // 发送 Transport.send(message); System.out.println("不是特别倒霉，你可以去查收邮件了。"); } }
要不，来个工具类?
认证器是一定的，沿用，略。
由于需要设置的属性多且繁杂，用个自己人简单易用的属性命名，所以来一个配置类
package No005_来一个工具类; import java.io.File; import java.util.ArrayList; import java.util.List; public class MailSenderConfig { private String SMTPMailHost; // 支持SMTP协议的邮件服务器地址 /* 用于登录邮件服务器 */ private String username; private String password; private String subject; // 标题 private String content; // 内容 private String fromMail; // 显示从此邮箱发出邮件 private List<String> toMails; // 收件人 private List<String> ccMails; // 抄送人 private List<String> bccMails; // 秘密抄送人 private List<File> attachments; // 附件 public MailSenderConfig(String sMTPMailHost, String subject, String content, String fromMail) { super(); SMTPMailHost = sMTPMailHost; this.subject = subject; this.content = content; this.fromMail = fromMail; } public String getSMTPMailHost() { return SMTPMailHost; } public void setSMTPMailHost(String sMTPMailHost) { SMTPMailHost = sMTPMailHost; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getFromMail() { return fromMail; } public void setFromMail(String fromMail) { this.fromMail = fromMail; } public List<String> getToMails() { return toMails; } public void setToMails(List<String> toMails) { this.toMails = toMails; } public List<String> getCcMails() { return ccMails; } public void setCcMails(List<String> ccMails) { this.ccMails = ccMails; } public List<String> getBccMails() { return bccMails; } public void setBccMails(List<String> bccMails) { this.bccMails = bccMails; } public List<File> getAttachments() { return attachments; } public void setAttachments(List<File> attachments) { this.attachments = attachments; } public String getSubject() { return subject; } public void setSubject(String subject) { this.subject = subject; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } public void addToMail (String mail) { if (this.toMails == null) { this.toMails = new ArrayList<String>(); } this.toMails.add(mail); } public void addCcMail (String mail) { if (this.ccMails == null) { this.ccMails = new ArrayList<String>(); } this.ccMails.add(mail); } public void addBccMail (String mail) { if (this.bccMails == null) { this.bccMails = new ArrayList<String>(); } this.bccMails.add(mail); } public void addAttachment (File f) { if (this.attachments == null) { this.attachments = new ArrayList<File>(); } this.attachments.add(f); } }
最后，就是工具类的部分，主要负责几个事情：按照Java Mail规则作些初始化动作、将自定义的属性配置类翻译并以Java Mail规则设置、发送邮件。
还有，需要提下的是，因为工具类所提供的代替设置的属性有限，更多的情况可能不满足需要，所以暴露出MimeMessage，在不满足需求的情况开发者可自行加工配置，而其他部分仍可沿用工具类。
package No005_来一个工具类; import java.io.File; import java.util.Properties; import javax.activation.DataHandler; import javax.activation.DataSource; import javax.activation.FileDataSource; import javax.mail.Address; import javax.mail.BodyPart; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; 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; import No002_各种发件人收件人抄送人怎么办.SimpleAuthenticator; public class MailSender { private MailSenderConfig c; private MimeMessage message; public MailSender(MailSenderConfig config) throws Exception { super(); this.c = config; this.setConfig(); } /** * 初始化 * @return */ private Session initSession() { Properties props = new Properties(); if (c.getSMTPMailHost() != null && c.getSMTPMailHost().length() > 0) { props.put("mail.smtp.host", c.getSMTPMailHost()); } if (c.getUsername() != null && c.getUsername().length() > 0 && c.getPassword() != null && c.getPassword().length() > 0) { props.put("mail.smtp.auth", "true"); return Session.getDefaultInstance(props, new SimpleAuthenticator(c.getUsername(), c.getPassword())); } else { props.put("mail.smtp.auth", "false"); return Session.getDefaultInstance(props); } } /** * 设置Java Mail属性 * @throws Exception */ private void setConfig() throws Exception { this.configValid(); Session s = this.initSession(); message = new MimeMessage(s); /* 发件人 */ Address[] fromMailArray = new Address[1]; fromMailArray[0] = new InternetAddress(c.getFromMail()); message.addFrom(fromMailArray); if (c.getToMails() != null && c.getToMails().size() > 0) { for (String mail : c.getToMails()) { message.addRecipient(Message.RecipientType.TO, new InternetAddress(mail)); } } if (c.getCcMails() != null && c.getCcMails().size() > 0) { for (String mail : c.getCcMails()) { message.addRecipient(Message.RecipientType.CC, new InternetAddress(mail)); } } if (c.getToMails() != null && c.getToMails().size() > 0) { for (String mail : c.getToMails()) { message.addRecipient(Message.RecipientType.BCC, new InternetAddress(mail)); } } // 邮件标题 message.setSubject(c.getSubject()); /* 正文 */ MimeBodyPart bodyPart = new MimeBodyPart(); bodyPart.setContent(c.getContent(), "text/html;charset=gb2312"); /* 封装邮件各部分信息 */ Multipart multipart = new MimeMultipart(); multipart.addBodyPart(bodyPart); message.setContent(multipart); BodyPart attachmentPart = null; DataSource ds = null; if (c.getAttachments() != null && c.getAttachments().size() > 0) { for (File f : c.getAttachments()) { attachmentPart = new MimeBodyPart(); ds = new FileDataSource(f); attachmentPart.setDataHandler(new DataHandler(ds)); attachmentPart.setFileName("=" + new sun.misc.BASE64Encoder().encode(f.getName().getBytes()) + ""); multipart.addBodyPart(attachmentPart); } } message.setContent(multipart); } /** * 配置校验 * @throws Exception */ private void configValid() throws Exception { if (c == null) { throw new Exception("配置对象为空"); } if (c.getSMTPMailHost() == null || c.getSMTPMailHost().length() == 0) { throw new Exception("SMTP服务器为空"); } if (c.getFromMail() == null && c.getFromMail().length() == 0) { throw new Exception("发件人邮件为空"); } if (c.getToMails() == null || c.getToMails().size() < 1) { throw new Exception("收件人邮件为空"); } if (c.getSubject() == null || c.getSubject().length() == 0) { throw new Exception("邮件标题为空"); } if (c.getContent() == null || c.getContent().length() == 0) { throw new Exception("邮件内容为空"); } } /** * 发送邮件 * @throws MessagingException */ public void send() throws MessagingException { Transport.send(message); } /** * 设置MimeMessage，暴露此对象以便于开发者自行设置个性化的属性 * @return */ public MimeMessage getMessage() { return message; } /** * 设置MimeMessage，暴露此对象以便于开发者自行设置个性化的属性 * @return */ public void setMessage(MimeMessage message) { this.message = message; } } 提供一个简单的测试类 package No005_来一个工具类; import java.io.File; import javax.mail.internet.MimeMessage; public class TestCall { public static void main(String[] args) throws Exception { /* 必需的信息 */ String SMTP_MAIL_HOST = "smtp.163.com"; // 此邮件服务器地址，自行去所属邮件查询 String EMAIL_USERNAME = "example@163.com"; String EMAIL_PASSWORD = "password"; String TO_EMAIL_ADDRESS_1 = "example@163.com"; String TO_EMAIL_ADDRESS_2 = "example@163.com"; /* 使用情况一，正常使用 */ /* MailSenderConfig c = new MailSenderConfig(SMTP_MAIL_HOST, "this is test mail for test java mail framework 3.", "this is content 3.", EMAIL_USERNAME); c.setUsername(EMAIL_USERNAME); c.setPassword(EMAIL_PASSWORD); c.addToMail(TO_EMAIL_ADDRESS_1); c.addToMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_1); c.addAttachment(new File("d:/1.txt")); MailSender ms = new MailSender(c); ms.send(); System.out.println("sent..."); */ /* 使用情况二，在更多情况下，工具类所作的设置并不满足需求，故将MimeMessage暴露并 */ MailSenderConfig c = new MailSenderConfig(SMTP_MAIL_HOST, "this is test mail for test java mail framework 4.", "this is content 4.", EMAIL_USERNAME); c.setUsername(EMAIL_USERNAME); c.setPassword(EMAIL_PASSWORD); c.addToMail(TO_EMAIL_ADDRESS_1); c.addToMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_1); c.addAttachment(new File("d:/1.txt")); MailSender ms = new MailSender(c); MimeMessage message = ms.getMessage(); message.setContent("this is the replaced content by MimeMessage 4.", "text/html;charset=utf-8"); ms.setMessage(message); ms.send(); System.out.println("sent..."); } }
升级下工具类
在实际使用中，发现在批量发送邮件情况下，工具类的支持不好，比如发送100封邮件，按照上述工具类的逻辑，每发送一封邮件就建立一个连接，那么，100封不就100次了吗？这样严重浪费啊。
于是，针对此点作些升级：
认证器是一定的，沿用，略。
配置类
import java.util.ArrayList; import java.util.List; public class MailSenderConfig { private String SMTPMailHost; // 支持SMTP协议的邮件服务器地址 /* 用于登录邮件服务器 */ private String username; private String password; private String subject; // 标题 private String content; // 内容 private String fromMail; // 显示从此邮箱发出邮件 private List<String> toMails; // 收件人 private List<String> ccMails; // 抄送人 private List<String> bccMails; // 秘密抄送人 private List<Attachment> attachments; // 附件 private String contentType = "text/html;charset=utf-8"; /** * 构造器 * @param sMTPMailHost SMTP服务器 * @param subject 标题 * @param content 内容（默认以“text/html;charset=utf-8”形式发送） * @param fromMail 发送人地址 */ public MailSenderConfig(String sMTPMailHost, String subject, String content, String fromMail) { super(); SMTPMailHost = sMTPMailHost; this.subject = subject; this.content = content; this.fromMail = fromMail; } /** * 构造器 * @param sMTPMailHost SMTP服务器 * @param username 邮件服务器用户名 * @param password 邮件服务器密码 * @param subject 标题 * @param content 内容（默认以“text/html;charset=utf-8”形式发送） * @param fromMail 发送人地址 */ public MailSenderConfig(String sMTPMailHost, String username, String password, String subject, String content, String fromMail) { super(); SMTPMailHost = sMTPMailHost; this.username = username; this.password = password; this.subject = subject; this.content = content; this.fromMail = fromMail; } public void addToMail (String mail) { if (this.toMails == null) { this.toMails = new ArrayList<String>(); } this.toMails.add(mail); } public void addCcMail (String mail) { if (this.ccMails == null) { this.ccMails = new ArrayList<String>(); } this.ccMails.add(mail); } public void addBccMail (String mail) { if (this.bccMails == null) { this.bccMails = new ArrayList<String>(); } this.bccMails.add(mail); } public void addAttachment (Attachment a) { if (this.attachments == null) { this.attachments = new ArrayList<Attachment>(); } this.attachments.add(a); } /* * Getter and Setter */ public String getSMTPMailHost() { return SMTPMailHost; } public void setSMTPMailHost(String sMTPMailHost) { SMTPMailHost = sMTPMailHost; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getFromMail() { return fromMail; } public void setFromMail(String fromMail) { this.fromMail = fromMail; } public List<String> getToMails() { return toMails; } public void setToMails(List<String> toMails) { this.toMails = toMails; } public List<String> getCcMails() { return ccMails; } public void setCcMails(List<String> ccMails) { this.ccMails = ccMails; } public List<String> getBccMails() { return bccMails; } public void setBccMails(List<String> bccMails) { this.bccMails = bccMails; } public List<Attachment> getAttachments() { return attachments; } public void setAttachments(List<Attachment> attachments) { this.attachments = attachments; } public String getSubject() { return subject; } public void setSubject(String subject) { this.subject = subject; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } public String getContentType() { return contentType; } public void setContentType(String contentType) { this.contentType = contentType; } } 附件实体类 import java.io.File; /** * 邮件附件实体类 */ public class Attachment { private File file; private String filename; public File getFile() { return file; } public void setFile(File file) { this.file = file; } public String getFilename() { if (filename == null || filename.trim().length() == 0) { return file.getName(); } return filename; } public void setFilename(String filename) { this.filename = filename; } public Attachment(File file, String filename) { super(); this.file = file; this.filename = filename; } public Attachment(File file) { super(); this.file = file; } } 抽象发送类 import java.util.Properties; import javax.mail.Session; public abstract class AbstractSessionMailSender { protected Session session; /** * 初始化Session * @return */ public static Session initSession(MailSenderConfig c) { Properties props = new Properties(); if (c.getSMTPMailHost() != null && c.getSMTPMailHost().length() > 0) { props.put("mail.smtp.host", c.getSMTPMailHost()); } if (c.getUsername() != null && c.getUsername().length() > 0 && c.getPassword() != null && c.getPassword().length() > 0) { props.put("mail.smtp.auth", "true"); return Session.getDefaultInstance(props, new SimpleAuthenticator(c.getUsername(), c.getPassword())); } else { props.put("mail.smtp.auth", "false"); return Session.getDefaultInstance(props); } } /** * 暴露Getter、Setter提供Session的可设置性，以支持批量发送邮件/发送多次邮件时，可缓存Session * @return */ public Session getSession() { return session; } public void setSession(Session session) { this.session = session; } }
发送类
import javax.activation.DataHandler; import javax.activation.DataSource; import javax.activation.FileDataSource; import javax.mail.Address; import javax.mail.BodyPart; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; 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; import javax.mail.internet.MimeUtility; public class MailSender extends AbstractSessionMailSender { private MailSenderConfig c; private MimeMessage message; public MailSender(MailSenderConfig config) throws Exception { super(); this.c = config; this.setConfig(); } public MailSender(MailSenderConfig config, Session session) throws Exception { super(); this.c = config; this.setConfig(); super.setSession(session); } /** * 发送邮件 * @throws MessagingException */ public void send() throws MessagingException { Transport.send(message); } /** * 获取MimeMessage，暴露此对象以便于开发者自行设置个性化的属性（此工具类不支持的方法可由开发人员自行设置，设置完毕设置回来） * @return */ public MimeMessage getMessage() { return message; } /** * 设置MimeMessage，暴露此对象以便于开发者自行设置个性化的属性（此工具类不支持的方法可由开发人员自行设置，设置完毕设置回来） * @return */ public void setMessage(MimeMessage message) { this.message = message; } /** * 设置Java Mail属性 * @throws Exception */ private void setConfig() throws Exception { this.configValid(); if (session == null) { session = initSession(c); } message = new MimeMessage(session); /* 发件人 */ Address[] fromMailArray = new Address[1]; fromMailArray[0] = new InternetAddress(c.getFromMail()); message.addFrom(fromMailArray); if (c.getToMails() != null && c.getToMails().size() > 0) { for (String mail : c.getToMails()) { message.addRecipient(Message.RecipientType.TO, new InternetAddress(mail)); } } if (c.getCcMails() != null && c.getCcMails().size() > 0) { for (String mail : c.getCcMails()) { message.addRecipient(Message.RecipientType.CC, new InternetAddress(mail)); } } if (c.getToMails() != null && c.getToMails().size() > 0) { for (String mail : c.getToMails()) { message.addRecipient(Message.RecipientType.BCC, new InternetAddress(mail)); } } // 邮件标题 message.setSubject(c.getSubject()); /* 正文 */ MimeBodyPart bodyPart = new MimeBodyPart(); bodyPart.setContent(c.getContent(), c.getContentType()); /* 封装邮件各部分信息 */ Multipart multipart = new MimeMultipart(); multipart.addBodyPart(bodyPart); message.setContent(multipart); /* 附件 */ BodyPart attachmentPart = null; DataSource ds = null; if (c.getAttachments() != null && c.getAttachments().size() > 0) { for (Attachment a : c.getAttachments()) { attachmentPart = new MimeBodyPart(); ds = new FileDataSource(a.getFile()); attachmentPart.setDataHandler(new DataHandler(ds)); attachmentPart.setFileName(MimeUtility.encodeText(a.getFilename())); multipart.addBodyPart(attachmentPart); } } message.setContent(multipart); } /** * 配置校验 * @throws Exception */ private void configValid() throws Exception { if (c == null) { throw new Exception("配置对象为空"); } if (c.getSMTPMailHost() == null || c.getSMTPMailHost().length() == 0) { throw new Exception("SMTP服务器为空"); } if (c.getFromMail() == null && c.getFromMail().length() == 0) { throw new Exception("发件人邮件为空"); } if (c.getToMails() == null || c.getToMails().size() < 1) { throw new Exception("收件人邮件为空"); } if (c.getSubject() == null || c.getSubject().length() == 0) { throw new Exception("邮件标题为空"); } if (c.getContent() == null || c.getContent().length() == 0) { throw new Exception("邮件内容为空"); } } } 一个Junit的测试类 import java.io.File; import javax.mail.Session; import javax.mail.internet.MimeMessage; import org.junit.Test; public class ReadMe { /* 必需的信息 */ String SMTP_MAIL_HOST = "smtp.163.com"; // 此邮件服务器地址，自行去所属邮件服务器描述页查询 String EMAIL_USERNAME = "example@163.com"; String EMAIL_PASSWORD = "password"; String TO_EMAIL_ADDRESS_1 = "example@163.com"; /* 选填的信息 */ String TO_EMAIL_ADDRESS_2 = "example@163.com"; @Test public void case1() throws Exception { /* 使用情况一，正常使用 */ MailSenderConfig c = new MailSenderConfig(SMTP_MAIL_HOST, "this is a mail for test java mail framework in case1.", "this is content.", EMAIL_USERNAME); c.setUsername(EMAIL_USERNAME); c.setPassword(EMAIL_PASSWORD); c.addToMail(TO_EMAIL_ADDRESS_1); c.addToMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_1); c.addAttachment(new Attachment(new File("d:/1.txt"))); MailSender ms = new MailSender(c); ms.send(); System.out.println("sent..."); } @Test public void case2() throws Exception { /* 使用情况二，在更多情况下，工具类所作的设置并不满足需求，故将MimeMessage暴露以便于开发者自行设置个性化的属性 */ MailSenderConfig c = new MailSenderConfig(SMTP_MAIL_HOST, "this is a mail for test java mail framework in case2.", "this is content.", EMAIL_USERNAME); c.setUsername(EMAIL_USERNAME); c.setPassword(EMAIL_PASSWORD); c.addToMail(TO_EMAIL_ADDRESS_1); c.addToMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_1); c.addAttachment(new Attachment(new File("d:/1.txt"))); MailSender ms = new MailSender(c); MimeMessage message = ms.getMessage(); message.setContent("this is the replaced content by MimeMessage in case2.", "text/html;charset=utf-8"); ms.setMessage(message); ms.send(); System.out.println("sent..."); } @Test public void case3() throws Exception { /* 使用情况三，多次发送邮件，可缓存Session，使多次发送邮件均共享此Session，以减少重复创建Session * 同时需注意缓存的Session的时效性 */ MailSenderConfig c = new MailSenderConfig(SMTP_MAIL_HOST, "this is the first mail for test java mail framework to share session in case3.", "this is content.", EMAIL_USERNAME); c.setUsername(EMAIL_USERNAME); c.setPassword(EMAIL_PASSWORD); c.addToMail(TO_EMAIL_ADDRESS_1); c.addToMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_2); c.addCcMail(TO_EMAIL_ADDRESS_1); c.addAttachment(new Attachment(new File("d:/1.txt"))); Session session = MailSender.initSession(c); MailSender ms = new MailSender(c, session); ms.send(); c.setSubject("this is the second mail for test java mail framework to share session in case3."); c.setContent("this is content 2."); ms = new MailSender(c, session); ms.send(); System.out.println("sent..."); } }
总结
目前，我遇到的需求就是这么多，如日后遇见其他常见的需求并有时间，会进一步添加。
以上所述是小编给大家介绍的Java发送邮件遇到的常见需求汇总的全部叙述，希望对大家有所帮助，如果大家有任何疑问请给我们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！
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