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 = "[email protected]";String EMAIL_PASSWORD = "mypassword";String TO_EMAIL_ADDRESS = "[email protected]";/* 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 = "[email protected]";String EMAIL_PASSWORD = "mypassword";String TO_EMAIL_ADDRESS_1 = "[email protected]";String CC_EMAIL_ADDRESS_1 = "[email protected]";String BCC_EMAIL_ADDRESS_1 = "[email protected]";/* 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 protected]", "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 = "[email protected]";String EMAIL_PASSWORD = "password";String TO_EMAIL_ADDRESS_1 = "[email protected]";/* 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("=?GBK?B?" + 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("=?GBK?B?" + 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 = "[email protected]";String EMAIL_PASSWORD = "password";String TO_EMAIL_ADDRESS_1 = "[email protected]";/* 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("=?GBK?B?" + 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 = "[email protected]";String EMAIL_PASSWORD = "password";String TO_EMAIL_ADDRESS_1 = "[email protected]";String TO_EMAIL_ADDRESS_2 = "[email protected]";/* 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 = "[email protected]";String EMAIL_PASSWORD = "password";String TO_EMAIL_ADDRESS_1 = "[email protected]";/* 选填的信息 */String TO_EMAIL_ADDRESS_2 = "[email protected]";@Testpublic 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...");}@Testpublic 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...");}@Testpublic 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留言，小编会及时回复大家的。在此也非常感谢大家对武林网网站的支持！