网上图书商城项目学习笔记-005邮件辅助类

邮件辅助类

一、使用方法

在servlet层中调用UserService.java

    public void regist(User user) {
        //1. 数据的补齐
        user.setUid(CommonUtils.uuid());
        user.setStatus(false);
        user.setActivationCode(CommonUtils.uuid() + CommonUtils.uuid());
        
        //2. 向数据库插入
        try {
            userDao.add(user);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        
        //3. 发邮件
        //3.1 把配置文件内容加载到prop中
        Properties prop = new Properties();
        try {
            prop.load(this.getClass().getClassLoader().getResourceAsStream("email_template.properties"));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        //3.2  登录邮件服务器，得到session
        String host = prop.getProperty("host");
        String username = prop.getProperty("username");
        String password = prop.getProperty("password");
        Session session = MailUtils.createSession(host, username, password);
        
        //3.3 创建Mail对象
        String from = prop.getProperty("from");
        String to = user.getEmail();
        String subject = prop.getProperty("subject");
        // MessageForm.format方法会把第一个参数中的{0},使用第二个参数来替换。
        // 例如MessageFormat.format("你好{0}, 你{1}!", "张三", "去死吧"); 返回“你好张三，你去死吧！”
        String content = MessageFormat.format(prop.getProperty("content"), user.getActivationCode());
        Mail mail = new Mail(from, to ,subject, content);
        
        //3.4 发送邮件
        try {
            MailUtils.send(session, mail);
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

二、源代码

1.MailUtils.java

package cn.itcast.mail;

import java.io.IOException;
import java.util.List;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
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;
import javax.mail.internet.MimeUtility;

/**
 * 
 * @author itcast 本类只有这么一个方法，用来发邮件！
 */
public class MailUtils {
    public static Session createSession(String host, final String username, final String password) {
        Properties prop = new Properties();
        prop.setProperty("mail.host", host);// 指定主机
        prop.setProperty("mail.smtp.auth", "true");// 指定验证为true

        // 创建验证器
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        };
        
        // 获取session对象
        return Session.getInstance(prop, auth);
    }
    
    /**
     * 发送指定的邮件
     * 
     * @param mail
     */
    public static void send(Session session, final Mail mail) throws MessagingException,
            IOException {

        MimeMessage msg = new MimeMessage(session);// 创建邮件对象
        msg.setFrom(new InternetAddress(mail.getFrom()));// 设置发件人
        msg.addRecipients(RecipientType.TO, mail.getToAddress());// 设置收件人

        // 设置抄送
        String cc = mail.getCcAddress();
        if (!cc.isEmpty()) {
            msg.addRecipients(RecipientType.CC, cc);
        }

        // 设置暗送
        String bcc = mail.getBccAddress();
        if (!bcc.isEmpty()) {
            msg.addRecipients(RecipientType.BCC, bcc);
        }

        msg.setSubject(mail.getSubject());// 设置主题

        MimeMultipart parts = new MimeMultipart();// 创建部件集对象

        MimeBodyPart part = new MimeBodyPart();// 创建一个部件
        part.setContent(mail.getContent(), "text/html;charset=utf-8");// 设置邮件文本内容
        parts.addBodyPart(part);// 把部件添加到部件集中
        
        ///////////////////////////////////////////

        // 添加附件
        List<AttachBean> attachBeanList = mail.getAttachs();// 获取所有附件
        if (attachBeanList != null) {
            for (AttachBean attach : attachBeanList) {
                MimeBodyPart attachPart = new MimeBodyPart();// 创建一个部件
                attachPart.attachFile(attach.getFile());// 设置附件文件
                attachPart.setFileName(MimeUtility.encodeText(attach
                        .getFileName()));// 设置附件文件名
                String cid = attach.getCid();
                if(cid != null) {
                    attachPart.setContentID(cid);
                }
                parts.addBodyPart(attachPart);
            }
        }

        msg.setContent(parts);// 给邮件设置内容
        Transport.send(msg);// 发邮件
    }
}

2.Mail.java

package cn.itcast.mail;

import java.util.ArrayList;
import java.util.List;

/**
 * 表示邮件类，你需要设置：账户名和密码、收件人、抄送(可选)、暗送(可选)、主题、内容，以及附件(可选)
 * 
 * 在创建了Mail对象之后
 * 可以调用它的setSubject()、setContent()，设置主题和正文
 * 也可以调用setFrom()和　addToAddress()，设置发件人，和添加收件人。
 * 也可以调用addAttch()添加附件
 * 创建AttachBean：new AttachBean(new File("..."), "fileName");
 */
public class Mail {
    private String from;//发件人
    private StringBuilder toAddress = new StringBuilder();//收件人
    private StringBuilder ccAddress = new StringBuilder();//抄送
    private StringBuilder bccAddress = new StringBuilder();//暗送
    
    private String subject;//主题
    private String content;//正文
    
    // 附件列表
    private List<AttachBean> attachList = new ArrayList<AttachBean>();
    
    public Mail() {}
    
    public Mail(String from, String to) {
        this(from, to, null, null);
    }
    
    public Mail(String from, String to, String subject, String content) {
        this.from = from;
        this.toAddress.append(to);
        this.subject = subject;
        this.content = content;
    }
    
    /**
     * 返回发件人
     * @return
     */
    public void setFrom(String from) {
        this.from = from;
    }
    
    /**
     * 返回发件人
     * @return
     */
    public String getFrom() {
        return from;
    }
    
    /**
     * 返回主题
     */
    public String getSubject() {
        return subject;
    }

    /**
     * 设置主题
     */
    public void setSubject(String subject) {
        this.subject = subject;
    }

    /**
     * 获取主题内容
     */
    public String getContent() {
        return content;
    }

    /**
     * 设置主题内容
     * @param content
     */
    public void setContent(String content) {
        this.content = content;
    }

    /**
     * 获取收件人
     * @return
     */
    public String getToAddress() {
        return toAddress.toString();
    }

    /**
     * 获取抄送
     * @return
     */
    public String getCcAddress() {
        return ccAddress.toString();
    }

    /**
     * 获取暗送
     * @return
     */
    public String getBccAddress() {
        return bccAddress.toString();
    }

    /**
     * 添加收件人,可以是多个收件人
     * @param to
     */
    public void addToAddress(String to) {
        if(this.toAddress.length() > 0) {
            this.toAddress.append(",");
        }
        this.toAddress.append(to);
    }

    /**
     * 添加抄送人，可以是多个抄送人
     * @param cc
     */
    public void addCcAddress(String cc) {
        if(this.ccAddress.length() > 0) {
            this.ccAddress.append(",");
        }
        this.ccAddress.append(cc);
    }

    /**
     * 添加暗送人，可以是多个暗送人
     * @param bcc
     */
    public void addBccAddress(String bcc) {
        if(this.bccAddress.length() > 0) {
            this.bccAddress.append(",");
        }
        this.bccAddress.append(bcc);
    }
    
    /**
     * 添加附件，可以添加多个附件
     * @param attachBean
     */
    public void addAttach(AttachBean attachBean) {
        this.attachList.add(attachBean);
    }
    
    /**
     * 获取所有附件
     * @return
     */
    public List<AttachBean> getAttachs() {
        return this.attachList;
    }
}

 3.AttachBean.java

package cn.itcast.mail;

import java.io.File;

/*
 * 附件类，只有文件，即附件才文件名
 */
public class AttachBean {
    private String cid;
    private File file;
    private String fileName;

    public String getCid() {
        return cid;
    }

    public void setCid(String cid) {
        this.cid = cid;
    }
    
    public File getFile() {
        return file;
    }

    public void setFile(File file) {
        this.file = file;
    }

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public AttachBean() {

    }

    public AttachBean(File file, String fileName) {
        super();
        this.file = file;
        this.fileName = fileName;
    }
}