}

package com.nine.util;

import java.util.Random;

public class RandomUtil {

//生成随机数字和字母
public static String getStringRandom() {
String val = "";
Random random = new Random();

//参数length，表示生成几位随机数
for(int i = 0; i < 4; i++) {

String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
//输出字母还是数字
if( "char".equalsIgnoreCase(charOrNum) ) {
//输出是大写字母还是小写字母
int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
val += (char)(random.nextInt(26) + temp);
} else if( "num".equalsIgnoreCase(charOrNum) ) {
val += String.valueOf(random.nextInt(10));
}
}
return val;
}
}

package com.nine.pojo;

public class MyEmail {
private static MyEmail email;
private String host = "smtp.163.com"; // 发送方邮箱host
private String from = "17600246280@163.com"; // 发送方邮箱
private String user = "17600246280"; // 发送方邮箱账号
private String pwd = "ovel1314.21"; // 发送方邮箱密码

public static MyEmail getEmail(){
if(email!=null){
return email;
}else{
email = new MyEmail();
return email;
}
}
public String getFrom() {
return from;
}

public String getUser() {
return user;
}

public String getPwd() {
return pwd;
}

public String getHost() {
return host;
}
}

package com.nine.service;

public interface ISendEmailService {
/**
* 写一个发送邮件的方法
* @param content
* @param title
* @param address
* @param affix
* @param affixName
*/
void send(String content, String title, String address, String affix, String affixName);
}

package com.nine.service.impl;

import com.nine.pojo.MyEmail;
import com.nine.service.ISendEmailService;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

public class SendEmailServiceImpl implements ISendEmailService {

@Override
public void send(String content, String title, String address, String affix, String affixName) {
MyEmail myEmail = MyEmail.getEmail();
String host = myEmail.getHost();
String user = myEmail.getUser();
String pwd = myEmail.getPwd();
String from = myEmail.getFrom();

Properties props = new Properties();

// 设置发送邮件的邮件服务器的属性（这里使用网易的smtp服务器） -->需要修改
props.put("mail.smtp.host", host);
// 需要经过授权，也就是有户名和密码的校验，这样才能通过验证（一定要有这一条）
props.put("mail.smtp.auth", "true");

// 用刚刚设置好的props对象构建一个session
Session session = Session.getDefaultInstance(props);

// 有了这句便可以在发送邮件的过程中在console处显示过程信息，供调试使
// 用（你可以在控制台（console)上看到发送邮件的过程）
session.setDebug(true);

// 用session为参数定义消息对象
MimeMessage message = new MimeMessage(session);
try {
// 加载发件人地址 -->需要修改
message.setFrom(new InternetAddress(from));
// 加载收件人地址 -->需要修改
message.addRecipients(Message.RecipientType.TO, address);
List list = new ArrayList();//不能使用string类型的类型，这样只能发送一个收件人
String []median=address.split(",");//对输入的多个邮件进行逗号分割
for(int i=0;ilist.add(new InternetAddress(median[i]));
}
InternetAddress[] addresses =(InternetAddress[])list.toArray(new InternetAddress[list.size()]);
message.addRecipients(Message.RecipientType.TO, addresses);
// 加载标题 --->也需要修改
message.setSubject(title);

// 向multipart对象中添加邮件的各个部分内容，包括文本内容和附件
Multipart multipart = new MimeMultipart();

// 设置邮件的文本内容
BodyPart contentPart = new MimeBodyPart();
//需要修改的地方 写的内容
contentPart.setText(content);

multipart.addBodyPart(contentPart);
// 添加附件
if(affix != null && !"".equals(affix))
{
BodyPart messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(affix);
// 添加附件的内容
messageBodyPart.setDataHandler(new DataHandler(source));
// 添加附件的标题
// 这里很重要，通过下面的Base64编码的转换可以保证你的中文附件标题名在发送时不会变成乱码
sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
messageBodyPart.setFileName("=?GBK?B?"+ enc.encode(affixName.getBytes()) + "?=");
multipart.addBodyPart(messageBodyPart);
}

// 将multipart对象放到message中
message.setContent(multipart);
// 保存邮件
message.saveChanges();
// 发送邮件
Transport transport = session.getTransport("smtp");
// 连接服务器的邮箱
transport.connect(host, user, pwd);
// 把邮件发送出去
transport.sendMessage(message, message.getAllRecipients());
transport.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

from=kojikazama@163.com
user=kojikazama
pwd=zhuhaojie9015
host=smpt.163.com

//发送二维码验证
@RequestMapping(value = "sendCode",method = RequestMethod.GET)
@ResponseBody
public Map sendQRCode(String email) throws IOException, WriterException {
String title="XXX资讯后台管理系统";
String code= RandomUtil.getStringRandom();
String content="欢迎注册本平台，你的验证码是："+code;
TwoDimensionCode.QRCodeTest qrCodeTest = new TwoDimensionCode.QRCodeTest();
qrCodeTest.testEncodeToEmail(content,300,300,"piao","png",title,email);
Map map=new HashMap<>();
map.put("checkCode",",code);
return map;

}