Java发送邮件遇到的常见需求汇总

前端技术 2023/09/03 Java

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(\"=?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 = \"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(\"=?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 = \"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留言，小编会及时回复大家的。在此也非常感谢大家对phpstudy网站的支持！

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