最近比较忙，在做一个人事管理系统的项目，在这项目需求中，需要一个发送邮件的功能。这个时候我们可以使用javamail的jar包来实现完美需要的功能，在这里简单的分享一个最基础的发邮件功能。

首先我们需要去下载两个jar包，smtp.jar和mailapi.jar,导入到自己的项目中应该就不用我说了吧，大家都是有经验的开发人员了。

public class Demo1 {		public static void main(String[] args) throws Exception{		// TODO Auto-generated method stub		Properties props = new Properties();		props.setProperty("mail.smtp.auth", "true");		props.setProperty("mail.transport.protocol", "smtp");		Session session = Session.getInstance(props);		session.setDebug(true);				Message msg = new MimeMessage(session);		msg.setText("邮件测试");		msg.setFrom(new InternetAddress("你的邮箱号"));			Transport transport = session.getTransport();		transport.connect("邮箱驱动", 25, "邮箱账号", "邮箱密码");		transport.sendMessage(msg,				new Address[]{new InternetAddress("对方的邮箱号")});		transport.close();	}}

我这里用的驱动是阿里云的，有的是可以使用使用搜狐或者163邮箱的也都是可以了！

如果想做一些其它的功能的话可以利用邮箱找回密码，大致就是在你建表的时候要加上一个时间标志以及过期时间。

package com.soq.card.web.action;import java.sql.Timestamp;import java.util.List;import java.util.UUID;import org.hibernate.Criteria;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.criterion.Restrictions;import org.springframework.orm.hibernate3.HibernateTemplate;import com.soq.card.biz.UserHander;import com.soq.card.entity.Users;import com.soq.card.tools.DBhepler;import com.soq.card.tools.Mail;import com.soq.card.tools.Md5;import com.soq.card.web.base.BaseAction;/** * @author javen * @Email zyw205@gmail.com *  */public class PassEmailAction extends BaseAction {    private Users users;    private UserHander userHander;    private String email;    private String sid;    private String userName;        public String sendmail() {        try {            HibernateTemplate ht = this.getUserHander().getUsersDAO().getHibernateTemplate();            SessionFactory factory = ht.getSessionFactory();            Session session = factory.openSession();            Criteria criteria = session.createCriteria(Users.class);            criteria.add(Restrictions.eq("loginName", email));            List
    
      list = criteria.list();            if (list.size() > 0) {                users=list.get(0);                Mail mail = new Mail();                String secretKey = UUID.randomUUID().toString(); // 密钥                Timestamp outDate = new Timestamp(System.currentTimeMillis() + 30 * 60 * 1000);// 30分钟后过期                long date = outDate.getTime() / 1000 * 1000;// 忽略毫秒数  mySql 取出时间是忽略毫秒数的                                DBhepler bhepler=new DBhepler();                String sql="update users set outDate=?,validataCode=? where loginName=?;";                String str[] ={outDate+"",secretKey,users.getLoginName()};                bhepler.AddU(sql, str);                                //this.getUserHander().getUsersDAO().getHibernateTemplate().update(users); // 保存到数据库                System.out.println("   UserName>>>> "+users.getUserName());                String key =users.getUserName() + "$" + date + "$" + secretKey;                System.out.println(" key>>>"+key);                String digitalSignature = Md5.md5(key);// 数字签名                String path = this.getRequest().getContextPath();                String basePath = this.getRequest().getScheme() + "://"                        + this.getRequest().getServerName() + ":"                        + this.getRequest().getServerPort() + path + "/";                String resetPassHref = basePath + "checkLink?sid="                        + digitalSignature +"&userName="+users.getUserName();                String emailContent = "请勿回复本邮件.点击下面的链接,重设密码
     
     " + resetPassHref                        + "  或者    
     点击我重新设置密码"                        + "
     
tips:本邮件超过30分钟,链接将会失效，需要重新申请'找回密码'" + key                        + "\t" + digitalSignature;                mail.setTo(email);                mail.setFrom("XX");// 你的邮箱                mail.setHost("smtp.163.com");                mail.setUsername("XXX@163.com");// 用户                mail.setPassword("CXXX");// 密码                mail.setSubject("[二维码名片]找回您的账户密码");                mail.setContent(emailContent);                if (mail.sendMail()) {                    System.out.println(" 发送成功");                    this.getRequest().setAttribute("mesg", "重置密码邮件已经发送，请登陆邮箱进行重置！");                    return "sendMail";                }            } else {                this.getRequest().setAttribute("mesg", "用户名不存在,你不会忘记邮箱了吧?");                return "noUser";            }        } catch (Exception e) {            // TODO: handle exception             e.printStackTrace();        }        return null;    }    public String checkResetLink() {        System.out.println("sid>>>" + sid);        if (sid.equals("")  || userName.equals("")) {            this.getRequest().setAttribute("mesg", "链接不完整,请重新生成");            System.out.println(">>>>> null");            return "error";        }        HibernateTemplate ht = this.getUserHander().getUsersDAO().getHibernateTemplate();        SessionFactory factory = ht.getSessionFactory();        Session session = factory.openSession();        Criteria criteria = session.createCriteria(Users.class);        criteria.add(Restrictions.eq("userName", userName));        List
     
       list = criteria.list();        if (list.size()>0) {            users=list.get(0);                        Timestamp outDate = (Timestamp) users.getOutDate();            System.out.println("outDate>>>"+outDate);             if(outDate.getTime() <= System.currentTimeMillis()){ //表示已经过期                 this.getRequest().setAttribute("mesg", "链接已经过期,请重新申请找回密码.");                 System.out.println("时间 超时");                 return "error";             }                          String key = users.getUserName()+"$"+outDate.getTime()/1000*1000+"$"+users.getValidataCode();//数字签名                         System.out.println("key link》》"+key);             String digitalSignature = Md5.md5(key);// 数字签名                          System.out.println("digitalSignature>>>>"+digitalSignature);              if(!digitalSignature.equals(sid)) {                  this.getRequest().setAttribute("mesg", "链接不正确,是否已经过期了?重新申请吧.");                      System.out.println("标示不正确");                    return "error";              }else {                //链接验证通过 转到修改密码页面                this.getRequest().setAttribute("user", users);                return "success";            }        }else {            this.getRequest().setAttribute("mesg", "链接错误,无法找到匹配用户,请重新申请找回密码.");            System.out.println("用户不存在");            return "error";        }    }    public Users getUsers() {        return users;    }    public void setUsers(Users users) {        this.users = users;    }    public UserHander getUserHander() {        return userHander;    }    public void setUserHander(UserHander userHander) {        this.userHander = userHander;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    public String getSid() {        return sid;    }    public void setSid(String sid) {        this.sid = sid;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }}