Java实现QQ邮件发送邮件工具类

1、开启SMTP服务
在 QQ 邮箱里的 设置->账户里开启 SMTP 服务

注意开启完之后，QQ 邮箱会生成一个授权码，在代码里连接邮箱使用这个授权码而不是原始的邮箱密码，这样可以避免使用明文密码。

2、下载依赖的 jar 包

官方下载地址 http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-eeplat-419426.html#javamail-1.4.7-oth-JPR。
解压完之后，通常我们只需要其中的mail.jar，把它加到我们 java 工程的依赖包中。

package com.weixiaoinfo.framework.util;

import com.sun.mail.util.MailSSLSocketFactory;

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import java.util.*;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
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;

public class SendMailUtil {
    private String username = null;
    private String password = null;
    private Authenticator auth = null;
    private MimeMessage mimeMessage =null;
    private Properties pros = null;
    private Multipart multipart = null;
    private BodyPart bodypart= null;
    /**
     * 初始化账号密码并验证
     * 创建MimeMessage对象
     * 发送邮件必须的步骤:1
     * @param username
     * @param password
     */
    public SendMailUtil(String username,String password){
        this.username = username;
        this.password = password;
    }

    /**
     * 设置email系统参数
     * 接收一个map集合key为string类型，值为String
     * 发送邮件必须的步骤:2
     * @param map
     */
    public void setPros(Map<String,String> map) throws GeneralSecurityException {
        pros = new Properties();
        //可以采用下面端口号  或者使用ssl加密
//        MailSSLSocketFactory sf = new MailSSLSocketFactory();
//        sf.setTrustAllHosts(true);
//        pros.put("mail.smtp.ssl.enable", "true");
//        pros.put("mail.smtp.ssl.socketFactory", sf);
        for(Map.Entry<String,String> entry:map.entrySet()){
            pros.setProperty(entry.getKey(), entry.getValue());
        }
    }

    /**
     * 初始化MimeMessage对象 存放邮件内容部分
     * 发送邮件必须的步骤:3
     */
    public void initMessage(){
        this.auth = new Email_Autherticator();
        Session session = Session.getDefaultInstance(pros,auth);
        session.setDebug(true); //设置获取 debug 信息
        mimeMessage = new MimeMessage(session);
    }
    /**
     * 验证账号密码
     * 发送邮件必须的步骤
     *
     */
    public class Email_Autherticator extends Authenticator
    {
        public PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication(username, password);
        }
    }
    /**
     * 设置发送邮件的基本参数(去除繁琐的邮件设置)
     * @param sub 设置邮件主题
     * @param text 设置邮件文本内容
     * @param rec 设置邮件接收人
     * @throws MessagingException
     * @throws UnsupportedEncodingException
     */
    public void setDefaultMessagePros(String sub,String text,String rec) throws MessagingException, UnsupportedEncodingException{
        mimeMessage.setSubject(sub);
        mimeMessage.setText(text);
        mimeMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(rec));
        mimeMessage.setSentDate(new Date());
        mimeMessage.setFrom(new InternetAddress(username,username));
    }
    /**
     * 设置主题
     * @param subject
     * @throws MessagingException
     */
    public void  setSubject(String subject) throws MessagingException{
        mimeMessage.setSubject(subject);
    }
    /**
     * 设置日期
     * @param date
     * @throws MessagingException
     */
    public void  setDate(Date date) throws MessagingException{
        mimeMessage.setSentDate(new Date());
    }
    /**
     * 设置邮件文本内容
     * @param text
     * @throws MessagingException
     */
    public void setText(String text) throws MessagingException{
        mimeMessage.setText(text);
    }
    /**
     * 设置邮件头部
     * @param arg0
     * @param arg1
     * @throws MessagingException
     */
    public void setHeader(String arg0,String arg1) throws MessagingException{
        mimeMessage.setHeader(arg0, arg1);
    }
    /**
     * 设置邮件接收人地址 <单人发送>
     * @param recipient
     * @throws MessagingException
     */
    public void setRecipient(String recipient) throws MessagingException{
        mimeMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
    }
    /**
     * 设置邮件接收人地址 <多人发送>
     * @param recs  收件人list集合
     * @throws MessagingException
     * @throws AddressException
     */
    public String setRecipients(List<String> recs) throws AddressException, MessagingException{
        if(recs.isEmpty()){
            return "接收人地址为空!";
        }
        for(String str:recs){
            mimeMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(str));
        }
        return "加入接收人地址成功!";
    }
    /**
     * 设置邮件接收人地址 <多人发送>
     * @param sb 收件人字符串集
     * @throws MessagingException
     * @throws AddressException
     */
    @SuppressWarnings("static-access")
    public String setRecipients(StringBuffer sb) throws AddressException, MessagingException{
        if(sb==null||"".equals(sb)){
            return "字符串数据为空!";
        }
        Address []address = new InternetAddress().parse(sb.toString());
        mimeMessage.addRecipients(Message.RecipientType.TO, address);
        return "收件人加入成功";
    }
    /**
     * 设置邮件发送人的名字
     * @param from
     * @throws UnsupportedEncodingException
     * @throws MessagingException
     */
    public void setFrom(String from) throws UnsupportedEncodingException, MessagingException{
        mimeMessage.setFrom(new InternetAddress(username,from));
    }
    /**
     * 发送邮件<单人发送>
     * return 是否发送成功
     * @throws MessagingException
     */
    public String sendMessage() throws MessagingException{
        Transport.send(mimeMessage);
        return "success";
    }
    /**
     * 设置附件
     * @param file 发送文件的路径
     */
    public void setMultipart(String file) throws MessagingException, IOException{
        if(multipart==null){
            multipart = new MimeMultipart();
        }
        multipart.addBodyPart(writeFiles(file));
        mimeMessage.setContent(multipart);
    }
    /**
     * 设置附件<添加多附件>
     * @param fileList<接收List集合>
     * @throws MessagingException
     * @throws IOException
     */
    public void setMultiparts(List<String> fileList) throws MessagingException, IOException{
        if(multipart==null){
            multipart = new MimeMultipart();
        }
        for(String s:fileList){
            multipart.addBodyPart(writeFiles(s));
        }
        mimeMessage.setContent(multipart);
    }
    /**
     * 发送文本内容，设置编码方式
     * <方法与发送附件配套使用>
     * <发送普通的文本内容请使用setText()方法>
     * @param s
     * @param type
     * @throws MessagingException
     */
    public void setContent(String s,String type) throws MessagingException{
        if(multipart==null){
            multipart = new MimeMultipart();
        }
        bodypart = new MimeBodyPart();
        bodypart.setContent(s, type);
        multipart.addBodyPart(bodypart);
        mimeMessage.setContent(multipart);
        mimeMessage.saveChanges();
    }
    /**
     * 读取附件
     * @param filePath
     * @return
     * @throws IOException
     * @throws MessagingException
     */
    public BodyPart writeFiles(String filePath)throws IOException, MessagingException{
        File file = new File(filePath);
        if(!file.exists()){
            throw new IOException("文件不存在!请确定文件路径是否正确");
        }
        bodypart = new MimeBodyPart();
        DataSource dataSource = new FileDataSource(file);
        bodypart.setDataHandler(new DataHandler(dataSource));
        //文件名要加入编码，不然出现乱码
        bodypart.setFileName(MimeUtility.encodeText(file.getName()));
        return bodypart;
    }

    public static void main(String[] args) throws MessagingException, GeneralSecurityException, IOException {
        Map<String,String> map= new HashMap<String,String>();
        SendMailUtil mail = new SendMailUtil("***@qq.com","*您的授权码*");
        map.put("mail.smtp.auth", "true");
        map.put("mail.smtp.host", "smtp.qq.com");
        //端口号，QQ邮箱需要使用SSL，端口号465或587
        map.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        map.put("mail.smtp.port", "465");
        map.put("mail.smtp.socketFactory.port", "465");
        mail.setPros(map);
        mail.initMessage();
        /*
         * 添加收件人有三种方法：
         * 1,单人添加(单人发送)调用setRecipient(str);发送String类型
         * 2,多人添加(群发)调用setRecipients(list);发送list集合类型
         * 3,多人添加(群发)调用setRecipients(sb);发送StringBuffer类型
         */
        //发送方式1
        mail.setRecipient("***@qq.com");
        //发送方式2
//        List<String> list = new ArrayList<String>();
//        list.add("***@qq.com");
//        list.add("***@163.com");
//        mail.setRecipients(list);
        //发送方式3
//        String defaultStr = "***@qq.com,***@163.com";
//        StringBuffer sb = new StringBuffer();
//        sb.append(defaultStr);
//        sb.append(",***@qq.com");
//        mail.setRecipients(sb);
        mail.setSubject("我是邮箱标题呀");
        mail.setText("我是邮箱内容呀");
        mail.setDate(new Date());
        mail.setFrom("我是发件人的名字呀");
//      mail.setMultipart("D:你你你.txt");
//        mail.setContent("谢谢合作123", "text/html; charset=UTF-8");
//        List<String> fileList = new ArrayList<String>();
//        fileList.add("D:123.png");
//        fileList.add("D:123.txt");
//        fileList.add("D:dstz.sql");
//        fileList.add("D:软件配置要求.doc");
//        mail.setMultiparts(fileList);
        System.out.println(mail.sendMessage());
    }

}

下面是另一个版本的简易版的代码

package com.weixiaoinfo.framework.util;

import com.sun.mail.util.MailSSLSocketFactory;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class SendMail {
    public static void main(String[] args) throws MessagingException, GeneralSecurityException {
        Properties props = new Properties();
        //开启 SSL 加密
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        props.put("mail.smtp.ssl.enable", "true");
        props.put("mail.smtp.ssl.socketFactory", sf);

        // 开启debug调试
        props.setProperty("mail.debug", "true");
        // 发送服务器需要身份验证
        props.setProperty("mail.smtp.auth", "true");
        // 设置邮件服务器主机名
        props.setProperty("mail.host", "smtp.qq.com");
        // 发送邮件协议名称
        props.setProperty("mail.transport.protocol", "smtp");

        Session session = Session.getInstance(props);

        //邮件内容部分
        Message msg = new MimeMessage(session);
        msg.setSubject("我是标题呀");
        StringBuilder builder = new StringBuilder();
        builder.append("我是您要发送内容");
        builder.append("可在内容追加哦");
        builder.append("\n data " + new Date());
        msg.setText(builder.toString());
        //邮件发送者
        msg.setFrom(new InternetAddress("***@qq.com"));

        //发送邮件
        Transport transport = session.getTransport();
        transport.connect("smtp.qq.com", "*您的邮箱*", "*授权码*");
        //接收人的邮箱地址
        transport.sendMessage(msg, new Address[]{new InternetAddress("***@163.com")});
        transport.close();
    }

}

参考①自：http://blog.csdn.net/never_cxb/article/details/50543289
参考②自：http://blog.csdn.net/Coding_One/article/details/51354456
感谢两位作者的辛苦劳动