java发送邮件 生成格式 java发送邮件详解

情景：使用java发送邮件验证码

利用java发送邮件需要做一些准备操作：

这里使用到了qq邮箱。

首先，打开qq邮箱，在设置，帐户那里，开启pop3/smtp,和imap/smtp服务。这里开启需要手机发送短信来验证。

而后，点击下方得生成授权码，会要求使用手机来验证。验证ok后，会生成一串授权码，记住它，后面有用。使用java mail来利用qq邮箱发送邮件就需要这个授权码。（这里有个需要注意得点是：这个16位的授权码显示的时候是4个4个一组得显示，但是，实际上，授权码是16位连续的，中间没有空格，这个在后面输入的时候要注意！，要不然会报535错误！）

使用java来使用mail服务，需要相应的包，这个包有3个，在我的上传资源里可以找到。

接下来上代码就完事了： 

import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.UnsupportedEncodingException;
import java.util.Date;

public class JavaMailUtil {
    //发件人的邮箱和密码
    public static String emailAccount="qq邮箱地址";
    //发件人的邮箱得授权码
    public static String emailPassword="授权码";
    //发件人邮箱得服务地址
    public static String emailSMTPHost="smtp.qq.com";
    //收件人邮箱
    public static String receiveMailAccount="";

    /**
     * 创建一封邮件对象
     * @param session
     * @param sendMail
     * @param receiveMail
     * @param html
     * @return
     * cc:抄送
     * Bcc：密送
     * To:发送
     */
    public static MimeMessage createMimeMessage(Session session,String sendMail,String receiveMail,String html) throws UnsupportedEncodingException, MessagingException {
        //创建一封邮件对象
        MimeMessage message = new MimeMessage(session);
        //From:发件人
        message.setFrom(new InternetAddress(sendMail,"发送方的名字","utf-8"));
        //To:收件人（也可以抄送或者密送)
        message.setRecipient(MimeMessage.RecipientType.TO,new InternetAddress(receiveMail,"对方name","utf-8"));
        //Subject:邮件的主题
        message.setSubject("邮箱验证","utf-8");
        //content：邮件正文(可以使用html标签)
        message.setContent(html,"text/html;charset=UTF-8");
        //设置发送时间
        message.setSentDate(new Date());
        //保存设置
        message.saveChanges();
        return message;
    }
}

还需要一个类来生成随机数： 

import java.lang.ref.SoftReference;

public class RandomUtil {
    public static String getRandom(){
        String[]letters=new String[]{"q","w","e","r","t","y","u","i","o","p","a","s","d","f","g","h","j","k","l","z","x","c","v","b","n","m",
                "A","W","E","R","T","Y","U","I","O","P","A","S","D","F","G","H","J","K","L","Z","X","C","V","B","N","M",
                "0","1","2","3","4","5","6","7","8","9"
              };
        String code="";
        for(int i=0;i<6;i++)
        {
            code=code+letters[(int)Math.floor(Math.random()*letters.length)];
        }
        return code;
    }
}

public class htmlText {
    public static String sendHtml(String code)
    {
        String html="Email地址验证<br/>"+
                "这封邮件是快拼网发送的。<br/>"+
                "你收到的这封邮件是csdn进行新用户注册的。<br/>"+
                "账号激活声明<br/>"+
                "请将下面的验证码输入提示框里即可！"+
                "<h3 style='color:red;'>"+code+"</h3><br/>";
        return html;
    }

}

 这是邮件的内容。

使用的时候：

@RequestMapping("sendEmail")
    @ResponseBody
    public String sendEmail(String email, HttpSession httpSession){
        JavaMailUtil.receiveMailAccount=email;//给用户输入的邮箱发送邮件
        //1.创建参数配置，用来连接邮箱服务器的参数配置
        Properties props = new Properties();
        //开启Debug模式
        props.setProperty("mail.debug","true");
        //发送服务器需要身份验证
        props.setProperty("'mail.smtp.auth","true");
        //设置邮件服务器的主机名
        props.setProperty("mail.host",JavaMailUtil.emailSMTPHost);
        //发送邮件协议名称
        props.setProperty("mail.transport.protocol","smtp");
        //2.根据配置创建会话对象用来和邮件服务器交互
        Session session = Session.getInstance(props);
        //设置debug，可以查看详细的发送log
        session.setDebug(true);
        //3.创建一封邮件
        String code = RandomUtil.getRandom();
        System.out.println("邮箱验证码:"+code);
        String html = htmlText.sendHtml(code);
        MimeMessage message=null;
        try {
            message= JavaMailUtil.createMimeMessage(session, JavaMailUtil.emailAccount, JavaMailUtil.receiveMailAccount, html);
            //4.根据session获取邮件传输对象
            Transport transport = session.getTransport();
            //5.使用邮箱账号和密码连接邮件服务器emailAccount必须和message中的发件人一样，否则报错
            transport.connect(JavaMailUtil.emailAccount,JavaMailUtil.emailPassword);
            //6.发送邮件，发送所有收件人的地址
            transport.sendMessage(message,message.getAllRecipients());
            //7.关闭连接
            transport.close();
            //写入session
            httpSession.setAttribute("code",code);
        } catch (Exception e) {
            e.printStackTrace();
            return "false";
        }
        return "OK";
    }
    @RequestMapping("register")
    public String register(Register register,HttpSession httpSession){
        String code =(String) httpSession.getAttribute("code");
        System.out.println(code);
        if(code!=null)
        {
            //获取页面提交的验证码
            String inputCode = register.getCode();
            System.out.println("页面提交的验证码"+inputCode);
            if(code.toLowerCase().equals(inputCode.toLowerCase()))
            {
                //验证成功，暂时先跳转到这里
                return "customer";
            }

        }
        //移除验证码
        httpSession.removeAttribute("code");
//验证失败，暂时先跳转到这里
        return "login";
    }

这样就OK了！