发送邮件（代码库）

pom.xml

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.5.6</version>
</dependency>

MailSenderInfo.java

import com.sun.mail.util.MailSSLSocketFactory;

import java.security.GeneralSecurityException;
import java.util.Properties;

public class MailSenderInfo {

    // 发送邮件的服务器的IP和端口
    private String mailServerHost;
    private String mailServerPort = "25";
    // 邮件发送者的地址
    private String fromAddress;
    // 邮件接收者的地址
    private String toAddress;

    private String password;
    // 是否需要身份验证
    private boolean validate = false;
    // 邮件主题
    private String subject;
    // 邮件的文本内容
    private String content;
    // 邮件附件的文件名
    private String[] attachFileNames;
    //邮件发件人昵称
    private String nick;

    private boolean ssl;

    public String getNick() {
        return nick;
    }

    public boolean isSsl() {
        return ssl;
    }

    public void setSsl(boolean ssl) {
        this.ssl = ssl;
    }

    public void setNick(String nick) {
        this.nick = nick;
    }

    private String httpServer;
    private MailType type = MailType.TEXT;//html or text;

    enum MailType {
        TEXT, HTML;
    }

    /** */
    /**
     * 获得邮件会话属性
     */
    public Properties getProperties() {
        Properties p = new Properties();
        p.put("mail.smtp.host", this.mailServerHost);
        p.put("mail.smtp.port", this.mailServerPort);
        p.put("mail.smtp.auth", validate ? "true" : "false");
        if (ssl) {
            try {
                MailSSLSocketFactory sf = new MailSSLSocketFactory();
                sf.setTrustAllHosts(true);
                p.put("mail.smtp.ssl.enable", "true");
                p.put("mail.smtp.ssl.socketFactory", sf);
            } catch (GeneralSecurityException e) {
            }

        }
        return p;
    }

    public String getMailServerHost() {
        return mailServerHost;
    }

    public void setMailServerHost(String mailServerHost) {
        this.mailServerHost = mailServerHost;
    }

    public String getMailServerPort() {
        return mailServerPort;
    }

    public void setMailServerPort(String mailServerPort) {
        this.mailServerPort = mailServerPort;
    }

    public boolean isValidate() {
        return validate;
    }

    public void setValidate(boolean validate) {
        this.validate = validate;
    }

    public String[] getAttachFileNames() {
        return attachFileNames;
    }

    public void setAttachFileNames(String[] fileNames) {
        this.attachFileNames = fileNames;
    }

    public String getFromAddress() {
        return fromAddress;
    }

    public void setFromAddress(String fromAddress) {
        this.fromAddress = fromAddress;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getToAddress() {
        return toAddress;
    }

    public void setToAddress(String toAddress) {
        this.toAddress = toAddress;
    }


    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String textContent) {
        this.content = textContent;
    }

    public String getHttpServer() {
        return httpServer;
    }

    public void setHttpServer(String httpServer) {
        this.httpServer = httpServer;
    }

    public MailType getType() {
        return type;
    }

    public void setType(MailType type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return "MailSenderInfo [mailServerHost=" + mailServerHost + ", mailServerPort=" + mailServerPort
                + ", fromAddress=" + fromAddress + ", toAddress=" + toAddress + ", content=" + content + ", httpServer="
                + httpServer + ", type=" + type + "]";
    }


}

MyAuthenticator.java

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

public class MyAuthenticator extends Authenticator {

    String userName = null;
    String password = null;

    public MyAuthenticator() {
    }

    public MyAuthenticator(String username, String password) {
        this.userName = username;
        this.password = password;
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(userName, password);
    }
    
}

Test.java

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Date;
import java.util.Properties;

/**
 * @author jiash
 * @since 2021/10/8
 */
public class Test {
    private static final String CHARSET = "UTF-8";

    public static boolean sendTextMail(MailSenderInfo mailInfo) {
        MyAuthenticator authenticator = null;
        Properties pro = mailInfo.getProperties();
        if (mailInfo.isValidate()) {
            // 如果需要身份认证，则创建一个密码验证器
            authenticator = new MyAuthenticator(mailInfo.getFromAddress(),
                    mailInfo.getPassword());
        }
        Session sendMailSession = Session.getInstance(pro, authenticator);
        try {
            // 根据session创建一个邮件通知
            MimeMessage mailMessage = new MimeMessage(sendMailSession);
            // 创建邮件发送者地址
            Address from = new InternetAddress(mailInfo.getFromAddress());
            if (mailInfo.getNick() != null && !"".equals(mailInfo.getNick())) {
                String nickName;
                try {
                    nickName = javax.mail.internet.MimeUtility.encodeText(mailInfo.getNick());
                    mailMessage.setFrom(new InternetAddress(nickName + " <" + from + ">"));
                } catch (Exception e) {
                }
            } else {
                // 设置邮件通知的发送者
                mailMessage.setFrom(from);
            }


            // 创建邮件的接收者地址，并设置到邮件通知中
            Address to = new InternetAddress(mailInfo.getToAddress());
            mailMessage.setRecipient(Message.RecipientType.TO, to);
            // 设置邮件通知的主题
            mailMessage.setSubject(mailInfo.getSubject(), CHARSET);
            // 设置邮件通知发送的时间
            mailMessage.setSentDate(new Date());

            Multipart mp = new MimeMultipart();
            MimeBodyPart mbpContent = new MimeBodyPart();
            mbpContent.setContent(mailInfo.getContent(),
                    "text/plain;charset=utf-8");
            mp.addBodyPart(mbpContent);

            if (mailInfo.getAttachFileNames() != null) {

                for (String fileName : mailInfo.getAttachFileNames()) {
                    MimeBodyPart mbpFile = new MimeBodyPart();
                    FileDataSource fds = new FileDataSource(fileName);
                    mbpFile.setDataHandler(new DataHandler(fds));
                    // 解决预发环境的发送邮件时附件的标题乱码问题
                    mbpFile.setFileName(MimeUtility.encodeText(fds.getName()));
                    mp.addBodyPart(mbpFile);
                }
            }

            // 设置邮件通知的主要内容
            mailMessage.setContent(mp);
            // 发送邮件
            Transport.send(mailMessage);
            return true;
        } catch (Exception ex) {
        }
        return false;
    }


    /**
     * 以HTML格式发送邮件
     *
     * @param mailInfo 待发送的邮件信息
     */
    public static boolean sendHtmlMail(MailSenderInfo mailInfo) {
        // 判断是否需要身份认证
        MyAuthenticator authenticator = null;
        Properties pro = mailInfo.getProperties();
        // 如果需要身份认证，则创建一个密码验证器
        if (mailInfo.isValidate()) {
            authenticator = new MyAuthenticator(mailInfo.getFromAddress(),
                    mailInfo.getPassword());
        }
        // 根据邮件会话属性和密码验证器构造一个发送邮件的session
        Session sendMailSession = Session.getInstance(pro, authenticator);
        try {
            // 根据session创建一个邮件通知
            MimeMessage mailMessage = new MimeMessage(sendMailSession);
            // 创建邮件发送者地址
            Address from = new InternetAddress(mailInfo.getFromAddress());
            // 设置邮件通知的发送者
            mailMessage.setFrom(from);
            // 创建邮件的接收者地址，并设置到邮件通知中
            Address to = new InternetAddress(mailInfo.getToAddress());
            // Message.RecipientType.TO属性表示接收者的类型为TO
            mailMessage.setRecipient(Message.RecipientType.TO, to);
            // 设置邮件通知的主题
            mailMessage.setSubject(mailInfo.getSubject(), CHARSET);
            // 设置邮件通知发送的时间
            mailMessage.setSentDate(new Date());
            // MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象
            Multipart mainPart = new MimeMultipart();

            if (mailInfo.getAttachFileNames() != null) {
                /*MimeBodyPart mbpContent = new MimeBodyPart();
                mbpContent.setContent(mailInfo.getContent(),
                        "text/plain;charset=utf-8");
                mainPart.addBodyPart(mbpContent);*/
                for (String fileName : mailInfo.getAttachFileNames()) {
                    MimeBodyPart mbpFile = new MimeBodyPart();
                    FileDataSource fds = new FileDataSource(fileName);
                    mbpFile.setDataHandler(new DataHandler(fds));
                    // 解决预发环境的发送邮件时附件的标题乱码问题
                    mbpFile.setFileName(MimeUtility.encodeText(fds.getName()));
                    mainPart.addBodyPart(mbpFile);
                }
            }

            // 创建一个包含HTML内容的MimeBodyPart
            BodyPart html = new MimeBodyPart();
            // 设置HTML内容
            html.setContent(mailInfo.getContent(), "text/html; charset=utf-8");
            mainPart.addBodyPart(html);
            // 创建一个包含图表的的MimeBodyPart
            // 将MiniMultipart对象设置为邮件内容
            mailMessage.setContent(mainPart);
            // 发送邮件
            Transport.send(mailMessage);
            return true;
        } catch (Exception ex) {
        }
        return false;
    }


    public static void main(String[] args) {
        MailSenderInfo mailInfo = new MailSenderInfo();

        mailInfo.setMailServerHost("smtp.sina.net");
        mailInfo.setPassword("解密后的明文密码xxxxx");
        mailInfo.setFromAddress("user@mail.xxxx.com");
        mailInfo.setMailServerPort("25");
        mailInfo.setValidate(true);

        mailInfo.setToAddress("1214369231@qq.com");
        mailInfo.setSubject("测试主题");
        mailInfo.setContent("测试一下");
        sendTextMail(mailInfo);
    }
}

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