Java实现发邮件功能

缺乏、安全感 2022-06-09 01:59 279阅读 0赞

代码如下:

package com.weimob.finance.utils;  
import java.io.UnsupportedEncodingException;  
import java.util.Date;  
import java.util.List;  
import java.util.Properties;  
  
import javax.activation.DataHandler;  
import javax.activation.FileDataSource;  
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;  
  
/\*\*   
 \* Java Mail 工具类   
 \*    
 \* @author XueQi   
 \* @version 1.0   
 \*    
 \*/    
public class MailUtils \{    
    private static String host;    
    private static String username;    
    private static String password;    
    private static String from;    
    private static String nick;    
    
    static \{    
        try \{    
            // Test Data    
            host = "smtp.qq.com";    
            username = "yourqq@qq.com";    
            password = "\*\*\*\*\*\*\*";    
            from = "yourqq@qq.com";    
            nick = "nickinfo";    
            // nick + from 组成邮箱的发件人信息    
        \} catch (Exception e) \{    
            e.printStackTrace();    
        \}    
    \}    
    
    /\*\*   
     \* 发送邮件   
     \*    
     \* @param to   
     \*            收件人列表，以","分割   
     \* @param subject   
     \*            标题   
     \* @param body   
     \*            内容   
     \* @param filepath   
     \*            附件列表,无附件传递null   
     \* @return   
     \* @throws MessagingException   
     \* @throws AddressException   
     \* @throws UnsupportedEncodingException   
     \*/    
    public static boolean sendMail(String to, String subject, String body,    
            List<String> filepath) throws AddressException, MessagingException,    
            UnsupportedEncodingException \{    
        // 参数修饰    
        if (body == null) \{    
            body = "";    
        \}    
        if (subject == null) \{    
            subject = "无主题";    
        \}    
        // 创建Properties对象    
        Properties props = System.getProperties();    
        // 创建信件服务器    
        props.put("mail.smtp.host", host);    
        props.put("mail.smtp.auth", "true"); // 通过验证    
        props.put("mail.smtp.port", "465");  
        props.put("mail.transport.protocol", "smtp");  
        props.put("mail.smtp.ssl.enable", "true");  
       //props.put("mail.debug", "true");  
        // 得到默认的对话对象    
        Session session = Session.getDefaultInstance(props, null);    
        // 创建一个消息，并初始化该消息的各项元素    
        MimeMessage msg = new MimeMessage(session);    
        nick = MimeUtility.encodeText(nick);    
        msg.setFrom(new InternetAddress(nick + "<" + from + ">"));    
        // 创建收件人列表    
        if (to != null && to.trim().length() > 0) \{    
            String\[\] arr = to.split(",");    
            int receiverCount = arr.length;    
            if (receiverCount > 0) \{    
                InternetAddress\[\] address = new InternetAddress\[receiverCount\];    
                for (int i = 0; i < receiverCount; i++) \{    
                    address\[i\] = new InternetAddress(arr\[i\]);    
                \}    
                msg.addRecipients(Message.RecipientType.TO, address);    
                msg.setSubject(subject);    
                // 后面的BodyPart将加入到此处创建的Multipart中    
                Multipart mp = new MimeMultipart();    
                // 附件操作    
                if (filepath != null && filepath.size() > 0) \{    
                    for (String filename : filepath) \{    
                        MimeBodyPart mbp = new MimeBodyPart();    
                        // 得到数据源    
                        FileDataSource fds = new FileDataSource(filename);    
                        // 得到附件本身并至入BodyPart    
                        mbp.setDataHandler(new DataHandler(fds));    
                        // 得到文件名同样至入BodyPart    
                        mbp.setFileName(fds.getName());    
                        mp.addBodyPart(mbp);    
                    \}    
                    MimeBodyPart mbp = new MimeBodyPart();    
                    mbp.setText(body);    
                    mp.addBodyPart(mbp);    
                    // 移走集合中的所有元素    
                    filepath.clear();    
                    // Multipart加入到信件    
                    msg.setContent(mp);    
                \} else \{    
                    // 设置邮件正文    
                    msg.setText(body);    
                \}    
                // 设置信件头的发送日期    
                msg.setSentDate(new Date());    
                msg.saveChanges();    
                // 发送信件    
                Transport transport = session.getTransport("smtp");    
                transport.connect(username, password);  
                transport.sendMessage(msg,    
                        msg.getRecipients(Message.RecipientType.TO));    
                transport.close();    
                return true;    
            \} else \{    
                System.out.println("None receiver!");    
                return false;    
            \}    
        \} else \{    
            System.out.println("None receiver!");    
            return false;    
        \}    
    \}    
    
    public static void main(String\[\] args) throws AddressException,    
            UnsupportedEncodingException, MessagingException \{    
        sendMail("toother@qq.com,yourqq@qq.com", "注册信息邮件", "注册邮件，有附件", null);  
        System.out.println("sendMail success!");  
    \}    
\}

准备过程:

1.QQ邮箱两个

2.发送邮件的jar包

mail.jar

<dependency>  
            <groupId>javax.mail</groupId>  
            <artifactId>mail</artifactId>  
            <version>1.5.0-b01</version>

</dependency>

3.用QQ给QQ发送邮件，发送方得开启第三方登录，也就是授权登录，下面就是获取授权码解释链接

需要开始POP3和SMTP，还有点击生成授权码

4.java代码(上面已附)

5运行,最后显示 250 Mail OK即发送成功

中间可能遇到的问题:

1.邮箱，帐号，密码配置不正确导致报connection failed error!