使用JavaMail发送邮件

使用JavaMail发送邮件需要用到mail.jar和activtion.jar两个包。

该类实现了较完整的邮件发送功能，包括以HTML格式发送，添加附件和抄送人。下面是具体的代码：

Mail.java：

package cn.cgw.util.mail;

import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
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;


public class Mail {

    private MimeMessage mimeMsg; //MIME邮件对象
    private Session session; //邮件会话对象
    private Properties props; //系统属性
    private boolean needAuth = false; //smtp是否需要认证
    //smtp认证用户名和密码
    private String username;
    private String password;
    private Multipart mp; //Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象

    /**
     * Constructor
     * @param smtp 邮件发送服务器
     */
    public Mail(String smtp){
        setSmtpHost(smtp);
        createMimeMessage();
    }

    /**
     * 设置邮件发送服务器
     * @param hostName String
     */
    public void setSmtpHost(String hostName) {
        System.out.println("设置系统属性：mail.smtp.host = "+hostName);
        if(props == null)
            props = System.getProperties(); //获得系统属性对象
        props.put("mail.smtp.host",hostName); //设置SMTP主机
    }


    /**
     * 创建MIME邮件对象
     * @return
     */
    public boolean createMimeMessage()
    {
        try {
            System.out.println("准备获取邮件会话对象！");
            session = Session.getDefaultInstance(props,null); //获得邮件会话对象
        }
        catch(Exception e){
            System.err.println("获取邮件会话对象时发生错误！"+e);
            return false;
        }

        System.out.println("准备创建MIME邮件对象！");
        try {
            mimeMsg = new MimeMessage(session); //创建MIME邮件对象
            mp = new MimeMultipart();

            return true;
        } catch(Exception e){
            System.err.println("创建MIME邮件对象失败！"+e);
            return false;
        }
    }

    /**
     * 设置SMTP是否需要验证
     * @param need
     */
    public void setNeedAuth(boolean need) {
        System.out.println("设置smtp身份认证：mail.smtp.auth = "+need);
        if(props == null) props = System.getProperties();
        if(need){
            props.put("mail.smtp.auth","true");
        }else{
            props.put("mail.smtp.auth","false");
        }
    }

    /**
     * 设置用户名和密码
     * @param name
     * @param pass
     */
    public void setNamePass(String name,String pass) {
        username = name;
        password = pass;
    }

    /**
     * 设置邮件主题
     * @param mailSubject
     * @return
     */
    public boolean setSubject(String mailSubject) {
        System.out.println("设置邮件主题！");
        try{
            mimeMsg.setSubject(mailSubject);
            return true;
        }
        catch(Exception e) {
            System.err.println("设置邮件主题发生错误！");
            return false;
        }
    }

    /**
     * 设置邮件正文
     * @param mailBody String
     */
    public boolean setBody(String mailBody) {
        try{
            BodyPart bp = new MimeBodyPart();
            bp.setContent(""+mailBody,"text/html;charset=GBK");
            mp.addBodyPart(bp);

            return true;
        } catch(Exception e){
        System.err.println("设置邮件正文时发生错误！"+e);
        return false;
        }
    }
    /**
     * 添加附件
     * @param filename String
     */
    public boolean addFileAffix(String filename) {

        System.out.println("增加邮件附件："+filename);
        try{
            BodyPart bp = new MimeBodyPart();
            FileDataSource fileds = new FileDataSource(filename);
            bp.setDataHandler(new DataHandler(fileds));
            bp.setFileName(fileds.getName());

            mp.addBodyPart(bp);

            return true;
        } catch(Exception e){
            System.err.println("增加邮件附件："+filename+"发生错误！"+e);
            return false;
        }
    }

    /**
     * 设置发信人
     * @param from String
     */
    public boolean setFrom(String from) {
        System.out.println("设置发信人！");
        try{
            mimeMsg.setFrom(new InternetAddress(from)); //设置发信人
            return true;
        } catch(Exception e) {
            return false;
        }
    }
    /**
     * 设置收信人
     * @param to String
     */
    public boolean setTo(String to){
        if(to == null)return false;
        try{
            mimeMsg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
            return true;
        } catch(Exception e) {
            return false;
        }
    }

    /**
     * 设置抄送人
     * @param copyto String
     */
    public boolean setCopyTo(String copyto)
    {
        if(copyto == null)return false;
        try{
        mimeMsg.setRecipients(Message.RecipientType.CC,(Address[])InternetAddress.parse(copyto));
        return true;
        }
        catch(Exception e)
        { return false; }
    }

    /**
     * 发送邮件
     */
    public boolean sendOut()
    {
        try{
            mimeMsg.setContent(mp);
            mimeMsg.saveChanges();
            System.out.println("正在发送邮件....");

            Session mailSession = Session.getInstance(props,null);
            Transport transport = mailSession.getTransport("smtp");
            transport.connect((String)props.get("mail.smtp.host"),username,password);
            transport.sendMessage(mimeMsg,mimeMsg.getRecipients(Message.RecipientType.TO));
            transport.sendMessage(mimeMsg,mimeMsg.getRecipients(Message.RecipientType.CC));
            //transport.send(mimeMsg);

            System.out.println("发送邮件成功！");
            transport.close();

            return true;
        } catch(Exception e) {
            System.err.println("邮件发送失败！"+e);
            return false;
        }
    }

    /**
     * 调用sendOut方法完成邮件发送
     * @param smtp
     * @param from
     * @param to
     * @param subject
     * @param content
     * @param username
     * @param password
     * @return boolean
     */
    public static boolean send(String smtp,String from,String to,String subject,String content,String username,String password) {
        Mail theMail = new Mail(smtp);
        theMail.setNeedAuth(true); //需要验证

        if(!theMail.setSubject(subject)) return false;
        if(!theMail.setBody(content)) return false;
        if(!theMail.setTo(to)) return false;
        if(!theMail.setFrom(from)) return false;
        theMail.setNamePass(username,password);

        if(!theMail.sendOut()) return false;
        return true;
    }

    /**
     * 调用sendOut方法完成邮件发送,带抄送
     * @param smtp
     * @param from
     * @param to
     * @param copyto
     * @param subject
     * @param content
     * @param username
     * @param password
     * @return boolean
     */
    public static boolean sendAndCc(String smtp,String from,String to,String copyto,String subject,String content,String username,String password) {
        Mail theMail = new Mail(smtp);
        theMail.setNeedAuth(true); //需要验证

        if(!theMail.setSubject(subject)) return false;
        if(!theMail.setBody(content)) return false;
        if(!theMail.setTo(to)) return false;
        if(!theMail.setCopyTo(copyto)) return false;
        if(!theMail.setFrom(from)) return false;
        theMail.setNamePass(username,password);

        if(!theMail.sendOut()) return false;
        return true;
    }

    /**
     * 调用sendOut方法完成邮件发送,带附件
     * @param smtp
     * @param from
     * @param to
     * @param subject
     * @param content
     * @param username
     * @param password
     * @param filename 附件路径
     * @return
     */
    public static boolean send(String smtp,String from,String to,String subject,String content,String username,String password,String filename) {
        Mail theMail = new Mail(smtp);
        theMail.setNeedAuth(true); //需要验证

        if(!theMail.setSubject(subject)) return false;
        if(!theMail.setBody(content)) return false;
        if(!theMail.addFileAffix(filename)) return false;
        if(!theMail.setTo(to)) return false;
        if(!theMail.setFrom(from)) return false;
        theMail.setNamePass(username,password);

        if(!theMail.sendOut()) return false;
        return true;
    }

    /**
     * 调用sendOut方法完成邮件发送,带附件和抄送
     * @param smtp
     * @param from
     * @param to
     * @param copyto
     * @param subject
     * @param content
     * @param username
     * @param password
     * @param filename
     * @return
     */
    public static boolean sendAndCc(String smtp,String from,String to,String copyto,String subject,String content,String username,String password,String filename) {
        Mail theMail = new Mail(smtp);
        theMail.setNeedAuth(true); //需要验证

        if(!theMail.setSubject(subject)) return false;
        if(!theMail.setBody(content)) return false;
        if(!theMail.addFileAffix(filename)) return false;
        if(!theMail.setTo(to)) return false;
        if(!theMail.setCopyTo(copyto)) return false;
        if(!theMail.setFrom(from)) return false;
        theMail.setNamePass(username,password);

        if(!theMail.sendOut()) return false;
        return true;
    }

}

 测试代码：

public static void main(String[] args){
    String smtp = "SMTP服务器";
    String from = "发信人";
    String to = "收信人";
    String copyto = "抄送人";
    String subject = "邮件主题";
    String content = "邮件内容";
    String username="用户名";
    String password="密码";
    String filename = "附件路径，如：F:\笔记<a>\struts2</a>与mvc.txt";
    Mail.sendAndCc(smtp, from, to, copyto, subject, content, username, password, filename);
}