工具类-发送邮件（通过JavaMail发送）

<dependency>
　　<groupId>javax.mail</groupId>
　　<artifactId>mail</artifactId>
　　<version>1.4.6</version>
</dependency>

package com.juihai.entity;

import java.util.Arrays;

public class EmailTO {
    private String title;//邮件主题
    private String content;//邮件内容
    private String sender;//发件人账号
    private String password;//发件人密码
    private String host;//发件邮箱服务器
    private String[] toAdress;//收件人地址
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
    public String getSender() {
        return sender;
    }
    public void setSender(String sender) {
        this.sender = sender;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getHost() {
        return host;
    }
    public void setHost(String host) {
        this.host = host;
    }
    public String[] getToAdress() {
        return toAdress;
    }
    public void setToAdress(String[] toAdress) {
        this.toAdress = toAdress;
    }
    @Override
    public String toString() {
        return "EmailTO [title=" + title + ", content=" + content + ", sender="
                + sender + ", password=" + password + ", host=" + host
                + ", toAdress=" + Arrays.toString(toAdress) + "]";
    }
    
    
}

import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
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.MimeMessage;

import org.apache.log4j.Logger;

import com.juihai.entity.EmailTO;

public class SendEmailUtils {
    /** 日志输出 */
    private static Logger log = Logger.getLogger(SendEmailUtils.class);

    public static boolean send(EmailTO to) throws GeneralSecurityException{

        final String user = to.getSender();
        final String password = to.getPassword();
        log.info("SendEmailUtils >>>> Start Send Mail");
        Properties properties = System.getProperties();// 获取系统属性
        properties.setProperty("mail.smtp.host", to.getHost());// 设置邮件服务器 "smtp.163.com",这是发件人的邮箱服务器
        properties.put("mail.smtp.auth", "true");
        String senderNick = null;
　　　　　
　　　　　//部分邮箱服务器需要开启SSL验证才可以发送邮件，需要的话，开启注释即可　
        /*MailSSLSocketFactory sf = new MailSSLSocketFactory();// SSL验证 begin
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);// SSL验证 end*/
        
        Session session = Session.getDefaultInstance(properties,
                new Authenticator() {
                    public PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(user, password); // 发件人邮件用户名、密码
                    }
                });
        try {
            MimeMessage message = new MimeMessage(session);// 创建默认的 MimeMessage对象
            senderNick = javax.mail.internet.MimeUtility.encodeText("Juihai");//设置发件人昵称 
            message.setFrom(new InternetAddress(senderNick+"<"+user+">"));
            
            //message.addRecipient(Message.RecipientType.TO,new InternetAddress());//创建单个收件人
            String[] tos = to.getToAdress();//创建多个收件人
            if (tos != null && tos.length != 0) {
                InternetAddress[] toAddress = new InternetAddress[tos.length];
                for (int i = 0; i < tos.length; i++) {
                    toAddress[i] = new InternetAddress(tos[i]);
                }
                message.setRecipients(Message.RecipientType.TO, toAddress);
            }
            message.setSubject(to.getTitle());//设置邮件主题
            //message.setText(content);//发送纯文本内容
            message.setContent(to.getContent(), "text/html;charset=utf-8");//发送html邮件内容
            
            Transport.send(message);//发送Email
            log.info(" SendEmailUtils邮件发送成功");
            return true;
        }catch (MessagingException mex) {
            mex.printStackTrace();
            log.info(" >>>>SendEmailUtils邮件发送失败"+mex);
        } catch (UnsupportedEncodingException e) {
            log.info(" >>>>SendEmailUtils邮件发送失败-设置发件人昵称error"+e);
            e.printStackTrace();
        }
        return false;
    }
}