java实现简单发送邮件功能

2024-04-02 19:04:59 748人浏览安东尼

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摘要

本文实例为大家分享了java实现简单发送邮件的具体代码，供大家参考，具体内容如下添加依赖  <!-- https://mvnr

本文实例为大家分享了java实现简单发送邮件的具体代码，供大家参考，具体内容如下

添加依赖

<!--发送邮件api-->
    <!-- https://mvnrepository.com/artifact/javax.mail/javax.mail-api -->
    <dependency>
      <groupId>javax.mail</groupId>
      <artifactId>javax.mail-api</artifactId>
      <version>1.6.2</version>
    </dependency>
    <!-- Https://mvnrepository.com/artifact/com.sun.mail/javax.mail -->
    <dependency>
      <groupId>com.sun.mail</groupId>
      <artifactId>javax.mail</artifactId>
      <version>1.6.2</version>
</dependency>

自定义异常类

public class EmailException extends Exception {

    public EmailException(String message) {
        super(message);
    }
     public EmailException() {
            super();
     }
    
    private static final long serialVersionUID = 115631651651651651L;

}

IMAP协议读取邮件

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFORMat;
import java.util.Date;
import java.util.Properties;

import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

import com.sun.mail.util.MailSSLSocketFactory;


public class IMAPReceiveMail {
    private String user = "";//账号
    private String passWord = "";//密码
    private  String HOST = ""; // smtp服务器
//    private Properties props = null;
    private Folder folder = null;//收件箱
    private Store store  = null;//实例对象
//    final String pop3 = "IMAP";
    final String imap = "imap";
    public IMAPReceiveMail(String user,String password) {
        this.password = password;//密码
        this.user = user;//账户
    }
    
     
//    public void forwardMail(Message message,String to) throws MessagingException, IOException {
//            Message forward = new MimeMessage(session);
//            forward.setSubject(message.getSubject());
//            forward.setFrom(new InternetAddress(to));
//            forward.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
//            forward.setSentDate(new Date());
//            forward.setContent(message.getContent(), message.getContentType());
//
//            Transport smtp = session.getTransport("smtp");
//            smtp.connect(HOST, user, password);//连接服务器的邮箱
//            smtp.sendMessage(forward, forward.getAllRecipients());
//            smtp.close();
//     }
    
    public  Folder resceive() throws Exception {
        
        String duankou = ""; // 端口号
        String servicePath = ""; // 服务器地址
        if(user==null||user.length()==0) throw new EmailException("账户不能为空！！！！");
        if(password==null||password.length()==0) throw new EmailException("密码不能为空！！！！");
        if(user.contains("@163")) {
            duankou = "143"; // 端口号
            servicePath = "imap.163.com"; // 服务器地址
        }else if(user.contains("@qq")) {
            duankou = "993"; // 端口号
            servicePath = "imap.qq.com"; // 服务器地址
        }else {
            throw new EmailException("不支持该协议");
        }

        // 准备连接服务器的会话信息
        Properties props = new Properties();
        
        props.setProperty("mail.store.protocol", imap); // 使用pop3协议
        props.setProperty("mail.imap.socketFactory.fallback", "false");
        props.setProperty("mail.imap.port", duankou); // 端口
        props.setProperty("mail.imap.socketFactory.port", duankou); // 端口
        props.setProperty("mail.transport.protocol", "smtp");// 发送邮件协议名称
        props.setProperty("mail.smtp.auth", "true");  //需要经过授权，也就是有户名和密码的校验，这样才能通过验证（一定要有这一条
        props.setProperty("mail.host", HOST);
        
        //关闭读取附件时分批获取 BASE64 输入流的配置
        props.setProperty("mail.imap.partialfetch", "false");
        props.setProperty("mail.imaps.partialfetch", "false");
//        props.setProperty("mail.pop3.host", servicePath); // pop3服务器
        
//        final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; 
//        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
//        props.setProperty("mail.imap.socketFactory.class", SSL_FACTORY);
        MailSSLSocketFactory sf = new MailSSLSocketFactory();//ssl加密
        sf.setTrustAllHosts(true);
        props.put("mail.imap.ssl.enable", "true");
        props.put("mail.imap.ssl.socketFactory", sf);
        
        // 创建Session实例对象
        Session session = Session.getInstance(props);
        session.setDebug(false);
        store = session.getStore(imap);
        store.connect(servicePath,user,password); // 163邮箱程序登录属于第三方登录所以这里的密码是163给的授权密码而并非普通的登录密码
        // 获得收件箱
        folder = store.getFolder("INBOX");
        
        folder.open(Folder.READ_WRITE); // 打开收件箱
        // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数
//        System.out.println("未读邮件数: " + folder.getUnreadMessageCount());
        // 由于POP3协议无法获知邮件的状态,所以下面得到的结果始终都是为0
//        System.out.println("删除邮件数: " + folder.getDeletedMessageCount());
//        System.out.println("新邮件: " + folder.getNewMessageCount());
        // 获得收件箱中的邮件总数
//        System.out.println("邮件总数: " + folder.getMessageCount());
        // 得到收件箱中的所有邮件,并解析
//        Message[] messages = folder.getMessages();
//        parseMessage(messages);
        // 得到收件箱中的所有邮件并且删除邮件
//        deleteMessage(messages);

        // 释放资源
//        folder.close(true);
//        store.close();
        return folder;
    }
    public void Colsefolder() throws MessagingException {//关闭资源
        if(folder!=null) {
            folder.close();
        }
        if(store!=null) {
            store.close();
        }
    }
    
    public  void parseMessage(Message... messages) throws MessagingException, IOException {
        if (messages == null || messages.length < 1)
            throw new MessagingException("未找到要解析的邮件!");
        // 解析所有邮件
        for (int i = 0, count = messages.length; i < count; i++) {
            MimeMessage msg = (MimeMessage) messages[i];
            System.out.println("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- ");
            System.out.println("主题: " + getSubject(msg));
            System.out.println("发件人: " + getFrom(msg));
            System.out.println("收件人：" + getReceiveAddress(msg, null));
            System.out.println("发送时间：" + getSentDate(msg, null));
            System.out.println("是否已读：" + isSeen(msg));
            System.out.println("邮件优先级：" + getPriority(msg));
            System.out.println("是否需要回执：" + isReplySign(msg));
            System.out.println("邮件大小：" + msg.getSize() * 1024 + "kb");
            boolean isContainerAttachment = isContainAttachment(msg);
            System.out.println("是否包含附件：" + isContainerAttachment);
            if (isContainerAttachment) {
                saveAttachment(msg, "f:\\mailTest\\" + msg.getSubject() + "_" + i + "_"); // 保存附件
            }
            StringBuffer content = new StringBuffer(30);
            getMailTextContent(msg, content);
            System.out.println("邮件正文：" + (content.length() > 100 ? content.substring(0, 100) + "..." : content));
            System.out.println("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- ");
            System.out.println();
        }
    }

    
    public  void deleteMessage(Message... messages) throws MessagingException, IOException {
        if (messages == null || messages.length < 1)
            throw new MessagingException("未找到要解析的邮件!");

        // 解析所有邮件
        for (int i = 0, count = messages.length; i < count; i++) {

            
            Message message = messages[i];
            String subject = message.getSubject();
            // set the DELETE flag to true
            message.setFlag(Flags.Flag.DELETED, true);
            System.out.println("Marked DELETE for message: " + subject);

        }
    }

    
    public  String getSubject(MimeMessage msg) throws UnsupportedEncodingException, MessagingException {
        return MimeUtility.decodeText(msg.getSubject());
    }

    
    public  String getFrom(MimeMessage msg) throws MessagingException, UnsupportedEncodingException {
        String from = "";
        Address[] froms = msg.getFrom();
        if (froms.length < 1)
            throw new MessagingException("没有发件人!");

        InternetAddress address = (InternetAddress) froms[0];
        String person = address.getPersonal();
        if (person != null) {
            person = MimeUtility.decodeText(person) + " ";
        } else {
            person = "";
        }
        from = person + "<" + address.getAddress() + ">";

        return from;
    }
    
    
    public  String getFromAddress(MimeMessage msg) throws MessagingException, UnsupportedEncodingException {
        String from = "";
        Address[] froms = msg.getFrom();
        if (froms.length < 1)
            throw new MessagingException("没有发件人!");

        InternetAddress address = (InternetAddress) froms[0];
        from = address.getAddress();

        return from;
    }
    
    public  String getReceiveAddress(MimeMessage msg, Message.RecipientType type) throws MessagingException {
        StringBuffer receiveAddress = new StringBuffer();
        Address[] addresss = null;
        if (type == null) {
            addresss = msg.getAllRecipients();
        } else {
            addresss = msg.getRecipients(type);
        }

        if (addresss == null || addresss.length < 1)
            throw new MessagingException("没有收件人!");
        for (Address address : addresss) {
            InternetAddress internetAddress = (InternetAddress) address;
            receiveAddress.append(internetAddress.toUnicodeString()).append(",");
        }

        receiveAddress.deleteCharAt(receiveAddress.length() - 1); // 删除最后一个逗号

        return receiveAddress.toString();
    }

    
    public  String getSentDate(MimeMessage msg, String pattern) throws MessagingException {
        Date receivedDate = msg.getSentDate();
        if (receivedDate == null)
            return "";

        if (pattern == null || "".equals(pattern))
            pattern = "yyyy年MM月dd日 E HH:mm ";

        return new SimpleDateFormat(pattern).format(receivedDate);
    }

    
    public  boolean isContainAttachment(Part part) throws MessagingException, IOException {
        boolean flag = false;
        if (part.isMimeType("multipart
    public  boolean isSeen(MimeMessage msg) throws MessagingException {
        return msg.getFlags().contains(Flags.Flag.SEEN);
    }

    
    public  boolean isReplySign(MimeMessage msg) throws MessagingException {
        boolean replySign = false;
        String[] headers = msg.getHeader("Disposition-Notification-To");
        if (headers != null)
            replySign = true;
        return replySign;
    }

    
    public  String getPriority(MimeMessage msg) throws MessagingException {
        String priority = "普通";
        String[] headers = msg.getHeader("X-Priority");
        if (headers != null) {
            String headerPriority = headers[0];
            if (headerPriority.indexOf("1") != -1 || headerPriority.indexOf("High") != -1)
                priority = "紧急";
            else if (headerPriority.indexOf("5") != -1 || headerPriority.indexOf("Low") != -1)
                priority = "低";
            else
                priority = "普通";
        }
        return priority;
    }

    
    public  void getMailTextContent(Part part, StringBuffer content) throws MessagingException, IOException {
        // 如果是文本类型的附件，通过getContent方法可以取到文本内容，但这不是我们需要的结果，所以在这里要做判断
        boolean isContainTextAttach = part.getContentType().indexOf("name") > 0;
        if (part.isMimeType("text
    public  void saveAttachment(Part part, String destDir)
            throws UnsupportedEncodingException, MessagingException, FileNotFoundException, IOException {
        if (part.isMimeType("multipart
    private  void saveFile(InputStream is, String destDir, String fileName)
            throws FileNotFoundException, IOException {
        BufferedInputStream bis = new BufferedInputStream(is);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(destDir + fileName)));
        int len = -1;
        while ((len = bis.read()) != -1) {
            bos.write(len);
            bos.flush();
        }
        bos.close();
        bis.close();
    }

    public void SetSEEN(MimeMessage message) throws MessagingException {//设置文件已读
        message.setFlag(Flags.Flag.SEEN,true);
    }
    
    public  String decodeText(String encodeText) throws UnsupportedEncodingException {
        if (encodeText == null || "".equals(encodeText)) {
            return "";
        } else {
            return MimeUtility.decodeText(encodeText);
        }
    }
}

POP3协议接收邮件

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

import com.sun.mail.util.MailSSLSocketFactory;


public class POP3ReceiveMail {
    private String user = "";//账号
    private String password = "";//密码
//    private Properties props = null;
    private Folder folder = null;//收件箱
    private Store store  = null;//实例对象
    final String pop3 = "pop3";
//    final String imap = "imap";
    public POP3ReceiveMail(String user,String password) {
        this.password = password;//密码
        this.user = user;//账户
    }
    
    public  Folder resceive() throws Exception {
        
        
        String duankou = ""; // 端口号
        String servicePath = ""; // 服务器地址
        if(user==null||user.length()==0) throw new EmailException("账户不能为空！！！！");
        if(password==null||password.length()==0) throw new EmailException("密码不能为空！！！！");
        if(user.contains("@163")) {
            duankou = "110"; // 端口号
            servicePath = "pop3.163.com"; // 服务器地址
        }else if(user.contains("@qq")) {
            duankou = "995"; // 端口号
            servicePath = "pop.qq.com"; // 服务器地址
        }else {
            throw new EmailException("不支持该协议");
        }
        

        // 准备连接服务器的会话信息
        Properties props = new Properties();
        props.setProperty("mail.store.protocol", pop3); // 使用pop3协议

//        props.setProperty("mail.transport.protocol", pop3); // 使用pop3协议
        props.setProperty("mail.pop3.port", duankou); // 端口
        props.setProperty("mail.pop3.host", servicePath); // pop3服务器
        props.setProperty("mail.pop3.socketFactory.fallback", "true");
        
        MailSSLSocketFactory sf = new MailSSLSocketFactory();//ssl加密
        sf.setTrustAllHosts(true);
        props.put("mail.pop3.ssl.enable", "true");
        props.put("mail.pop3.ssl.socketFactory", sf);
        
//        final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; 
//      Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
//        props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        // 创建Session实例对象
        Session session = Session.getInstance(props);
        store = session.getStore(pop3);
        store.connect(servicePath,user,password); // 163邮箱程序登录属于第三方登录所以这里的密码是163给的授权密码而并非普通的登录密码
        // 获得收件箱
        folder = store.getFolder("INBOX");
        
//        folder.open(Folder.READ_WRITE); // 打开收件箱
        folder.open(Folder.READ_WRITE); // 打开收件箱
        // 由于POP3协议无法获知邮件的状态,所以getUnreadMessageCount得到的是收件箱的邮件总数
//        System.out.println("未读邮件数: " + folder.getUnreadMessageCount());
        // 由于POP3协议无法获知邮件的状态,所以下面得到的结果始终都是为0
//        System.out.println("删除邮件数: " + folder.getDeletedMessageCount());
//        System.out.println("新邮件: " + folder.getNewMessageCount());
        // 获得收件箱中的邮件总数
//        System.out.println("邮件总数: " + folder.getMessageCount());
        // 得到收件箱中的所有邮件,并解析
//        Message[] messages = folder.getMessages();
//        parseMessage(messages);
        // 得到收件箱中的所有邮件并且删除邮件
//        deleteMessage(messages);

        // 释放资源
//        folder.close(true);
//        store.close();
        return folder;
    }
    public void Colsefolder() throws MessagingException {//关闭资源
        if(folder!=null) {
            folder.close();
        }
        if(store!=null) {
            store.close();
        }
    }
    
    public  void parseMessage(Message... messages) throws MessagingException, IOException {
        if (messages == null || messages.length < 1)
            throw new MessagingException("未找到要解析的邮件!");
        // 解析所有邮件
        for (int i = 0, count = messages.length; i < count; i++) {
            MimeMessage msg = (MimeMessage) messages[i];
            System.out.println("------------------解析第" + msg.getMessageNumber() + "封邮件-------------------- ");
            System.out.println("主题: " + getSubject(msg));
            System.out.println("发件人: " + getFrom(msg));
            System.out.println("收件人：" + getReceiveAddress(msg, null));
            System.out.println("发送时间：" + getSentDate(msg, null));
            System.out.println("是否已读：" + isSeen(msg));
            System.out.println("邮件优先级：" + getPriority(msg));
            System.out.println("是否需要回执：" + isReplySign(msg));
            System.out.println("邮件大小：" + msg.getSize() * 1024 + "kb");
            boolean isContainerAttachment = isContainAttachment(msg);
            System.out.println("是否包含附件：" + isContainerAttachment);
            if (isContainerAttachment) {
                saveAttachment(msg, "f:\\mailTest\\" + msg.getSubject() + "_" + i + "_"); // 保存附件
            }
            StringBuffer content = new StringBuffer(30);
            getMailTextContent(msg, content);
            System.out.println("邮件正文：" + (content.length() > 100 ? content.substring(0, 100) + "..." : content));
            System.out.println("------------------第" + msg.getMessageNumber() + "封邮件解析结束-------------------- ");
            System.out.println();
        }
    }

    
    public  void deleteMessage(Message... messages) throws MessagingException, IOException {
        if (messages == null || messages.length < 1)
            throw new MessagingException("未找到要解析的邮件!");

        // 解析所有邮件
        for (int i = 0, count = messages.length; i < count; i++) {

            
            Message message = messages[i];
            String subject = message.getSubject();
            // set the DELETE flag to true
            message.setFlag(Flags.Flag.DELETED, true);
            System.out.println("Marked DELETE for message: " + subject);

        }
    }

    
    public  String getSubject(MimeMessage msg) throws UnsupportedEncodingException, MessagingException {
        return MimeUtility.decodeText(msg.getSubject());
    }

    
    public  String getFrom(MimeMessage msg) throws MessagingException, UnsupportedEncodingException {
        String from = "";
        Address[] froms = msg.getFrom();
        if (froms.length < 1)
            throw new MessagingException("没有发件人!");

        InternetAddress address = (InternetAddress) froms[0];
        String person = address.getPersonal();
        if (person != null) {
            person = MimeUtility.decodeText(person) + " ";
        } else {
            person = "";
        }
        from = person + "<" + address.getAddress() + ">";

        return from;
    }

    public  String getFromAddress(MimeMessage msg) throws MessagingException, UnsupportedEncodingException {
        String from = "";
        Address[] froms = msg.getFrom();
        if (froms.length < 1)
            throw new MessagingException("没有发件人!");

        InternetAddress address = (InternetAddress) froms[0];
        from = address.getAddress();

        return from;
    }
    
    public  String getReceiveAddress(MimeMessage msg, Message.RecipientType type) throws MessagingException {
        StringBuffer receiveAddress = new StringBuffer();
        Address[] addresss = null;
        if (type == null) {
            addresss = msg.getAllRecipients();
        } else {
            addresss = msg.getRecipients(type);
        }

        if (addresss == null || addresss.length < 1)
            throw new MessagingException("没有收件人!");
        for (Address address : addresss) {
            InternetAddress internetAddress = (InternetAddress) address;
            receiveAddress.append(internetAddress.toUnicodeString()).append(",");
        }

        receiveAddress.deleteCharAt(receiveAddress.length() - 1); // 删除最后一个逗号

        return receiveAddress.toString();
    }

    
    public  String getSentDate(MimeMessage msg, String pattern) throws MessagingException {
        Date receivedDate = msg.getSentDate();
        if (receivedDate == null)
            return "";

        if (pattern == null || "".equals(pattern))
            pattern = "yyyy年MM月dd日 E HH:mm ";

        return new SimpleDateFormat(pattern).format(receivedDate);
    }

    
    public  boolean isContainAttachment(Part part) throws MessagingException, IOException {
        boolean flag = false;
        if (part.isMimeType("multipart
    public  boolean isSeen(MimeMessage msg) throws MessagingException {
        return msg.getFlags().contains(Flags.Flag.SEEN);
    }

    
    public  boolean isReplySign(MimeMessage msg) throws MessagingException {
        boolean replySign = false;
        String[] headers = msg.getHeader("Disposition-Notification-To");
        if (headers != null)
            replySign = true;
        return replySign;
    }

    
    public  String getPriority(MimeMessage msg) throws MessagingException {
        String priority = "普通";
        String[] headers = msg.getHeader("X-Priority");
        if (headers != null) {
            String headerPriority = headers[0];
            if (headerPriority.indexOf("1") != -1 || headerPriority.indexOf("High") != -1)
                priority = "紧急";
            else if (headerPriority.indexOf("5") != -1 || headerPriority.indexOf("Low") != -1)
                priority = "低";
            else
                priority = "普通";
        }
        return priority;
    }

    
    public  void getMailTextContent(Part part, StringBuffer content) throws MessagingException, IOException {
        // 如果是文本类型的附件，通过getContent方法可以取到文本内容，但这不是我们需要的结果，所以在这里要做判断
        boolean isContainTextAttach = part.getContentType().indexOf("name") > 0;
        if (part.isMimeType("text
    public  void saveAttachment(Part part, String destDir)
            throws UnsupportedEncodingException, MessagingException, FileNotFoundException, IOException {
        if (part.isMimeType("multipart
    private  void saveFile(InputStream is, String destDir, String fileName)
            throws FileNotFoundException, IOException {
        BufferedInputStream bis = new BufferedInputStream(is);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(destDir + fileName)));
        int len = -1;
        while ((len = bis.read()) != -1) {
            bos.write(len);
            bos.flush();
        }
        bos.close();
        bis.close();
    }

    
    public  String decodeText(String encodeText) throws UnsupportedEncodingException {
        if (encodeText == null || "".equals(encodeText)) {
            return "";
        } else {
            return MimeUtility.decodeText(encodeText);
        }
    }
}

发送邮件

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
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;
import javax.mail.internet.MimeUtility;

import com.sun.mail.util.MailSSLSocketFactory;


public class SendMailUtil {
    private  String HOST = ""; // smtp服务器
    private String FROM = ""; // 发件人地址
//    private String TO = ""; // 收件人地址
    private String[] AFFIX = null; // 附件地址
//    private String AFFIXNAME = ""; // 附件名称
    private String USER = ""; // 用户名
    private String PWD = ""; // 163的授权码
//    private String SUBJECT = ""; // 邮件标题
    private String[] TOS = null;
    private  Properties props = null;//
    
    public SendMailUtil(String USER,String PWD,String FROM) throws EmailException, GeneralSecurityException {
        this.USER = USER;//账户
        this.PWD = PWD;//密码
        this.FROM = FROM;//发件人地址
        stratProperties();
        
    }
    private void stratProperties() throws EmailException, GeneralSecurityException {
         props = new Properties();
         if(USER==null||USER.length()==0) {
             throw new EmailException("邮箱账号不能为空");    
         }else {
             if(USER.contains("@qq")) {
                 HOST = "smtp.qq.com";
             }else if(USER.contains("@163")) {
                 HOST = "smtp.163.com";
             }else if(USER.contains("@sina")) {
                 HOST = "smtp.sina.com.cn";
             }else {
                 throw new EmailException("不支持该协议");
             }
//             props.setProperty("mail.smtp.host", HOST);//设置发送邮件的邮件服务器的属性（这里使用网易的smtp服务器）
             // 设置邮件服务器主机名
             props.setProperty("mail.host", HOST);
             
         }
         if(PWD==null||PWD.length()==0)throw new EmailException("邮箱密码不能为空");
          props.setProperty("mail.transport.protocol", "smtp");// 发送邮件协议名称
         props.setProperty("mail.smtp.auth", "true");  //需要经过授权，也就是有户名和密码的校验，这样才能通过验证（一定要有这一条）
//         props.put("mail.debug", "true");//设置debug模式 后台输出邮件发送的过程
         
         MailSSLSocketFactory sf = new MailSSLSocketFactory();//ssl加密
         sf.setTrustAllHosts(true);
         props.put("mail.smtp.ssl.enable", "true");
         props.put("mail.smtp.ssl.socketFactory", sf);
    }
    
    public void forwardMail(Message message) throws AddressException, MessagingException, EmailException, IOException {
        if(TOS.length==0)throw new EmailException("收件人不能为空");
         Session session = Session.getInstance(props);//用props对象构建一个session
//         session.setDebug(true);//关闭控制台输出
         MimeMessage newmessage = new MimeMessage(session);//用session为参数定义消息对象
         newmessage.setSubject(message.getSubject());
            newmessage.setFrom(new InternetAddress(FROM));
          newmessage.setSentDate(new Date());
         newmessage.setContent(message.getContent(), message.getContentType());
         InternetAddress[] sendTo = new InternetAddress[TOS.length]; // 加载收件人地址
         for (int i = 0; i < TOS.length; i++) {  
             sendTo[i] = new InternetAddress(TOS[i]);  
         }
        newmessage.addRecipients(Message.RecipientType.TO,sendTo);
        newmessage.addRecipients(MimeMessage.RecipientType.CC, InternetAddress.parse(FROM));//设置在发送给收信人之前给自己（发送方）抄送一份，不然会被当成垃圾邮件，报554错
        Transport smtp = session.getTransport("smtp");
       smtp.connect(HOST, USER, PWD);
       smtp.sendMessage(newmessage, newmessage.getAllRecipients());
       smtp.close();
    }
    
    public void addFile(String...path) throws EmailException {
        if(path==null||path.length==0)throw new EmailException("附件路径不能为空");    
        this.AFFIX = path;
    }
    public void setTo(String...to) throws EmailException {
        if(toString().length()>0) {
            for(String t : to) {
                boolean emailFormat = emailFormat(t);
                if(!emailFormat) {
                    throw new EmailException(t+"邮箱格式不正确");    
                }
            }
            TOS = to;
        }else {
            throw new EmailException("收件人不能为空");    
        }
    }
   
    
    private  boolean emailFormat(String email)
    {
        boolean tag = true;
        final String pattern1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
        final Pattern pattern = Pattern.compile(pattern1);
        final Matcher mat = pattern.matcher(email);
        if (!mat.find()) {
            tag = false;
        }
        return tag;
    }
    
    public  void send(String SUBJECT,String context) throws EmailException, AddressException, MessagingException, GeneralSecurityException, UnsupportedEncodingException {
        
        if(SUBJECT==null||SUBJECT.length()==0)SUBJECT=UUID.randomUUID().toString();
//        this.SUBJECT = SUBJECT;//标题
        if(TOS.length==0)throw new EmailException("收件人不能为空");
        Session session = Session.getInstance(props);//用props对象构建一个session
//        session.setDebug(true);//关闭控制台输出
        MimeMessage message = new MimeMessage(session);//用session为参数定义消息对象
        message.setFrom(new InternetAddress(FROM));// 加载发件人地址
        InternetAddress[] sendTo = new InternetAddress[TOS.length]; // 加载收件人地址
        for (int i = 0; i < TOS.length; i++) {  
            sendTo[i] = new InternetAddress(TOS[i]);  
        }
        message.addRecipients(Message.RecipientType.TO,sendTo);
        message.addRecipients(MimeMessage.RecipientType.CC, InternetAddress.parse(FROM));//设置在发送给收信人之前给自己（发送方）抄送一份，不然会被当成垃圾邮件，报554错
        message.setSubject(SUBJECT);//加载标题
        Multipart multipart = new MimeMultipart();//向multipart对象中添加邮件的各个部分内容，包括文本内容和附件
        BodyPart contentPart = new MimeBodyPart();//设置邮件的文本内容
        contentPart.setText(context);
        multipart.addBodyPart(contentPart);
        if(AFFIX!=null&&AFFIX.length>0){//添加附件
            for(int i = 0 ; i <AFFIX.length ; i++) {
                File file = new File(AFFIX[i]);
                if(file.exists()) {
                     BodyPart messageBodyPart = new MimeBodyPart();
                     FileDataSource source = new FileDataSource(file);
//                     String AFFIXNAME = file.getName();
//                     System.out.println(AFFIXNAME);
                     messageBodyPart.setDataHandler(new DataHandler(source));//添加附件的内容
                     messageBodyPart.setFileName(MimeUtility.encodeWord(file.getName(), "GBK", null));
                     multipart.addBodyPart(messageBodyPart);
                }else {
                    throw new EmailException("文件"+AFFIX[i]+"不存在");
                }
            }
            
        }
        message.setContent(multipart);//将multipart对象放到message中
        message.saveChanges(); //保存邮件
        Transport transport = session.getTransport();//发送邮件
        transport.connect(HOST, USER, PWD);//连接服务器的邮箱
        transport.sendMessage(message, message.getAllRecipients());//把邮件发送出去
        transport.close();//关闭连接
    }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。

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本文标题: java实现简单发送邮件功能

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