Springboot整合发送邮箱功能

1.引入的依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>

2.创建一个组件用来产生邮箱验证码等特殊内容

package com.example.demo.utils;

import com.baomidou.mybatisplus.extension.api.R;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

public class CreateVerifyCodeImage {
    private static int WIDTH=90;
    private static int HEIGHT=35;
    private static int FONT_SIZE=20;
    private static char[] verifyCode;
    private static BufferedImage verifyCodeImage;
    public static BufferedImage getVerifyCodeImage(){
        verifyCodeImage = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_BGR);
        Graphics graphics = verifyCodeImage.getGraphics();
        verifyCode = generateCheckCode();
        drawBackground(graphics);
        drawRands(graphics,verifyCode);
        graphics.dispose();
        return verifyCodeImage;
    }

    private static void drawBackground(Graphics graphics) {
        graphics.setColor(Color.white);
        graphics.fillRect(0,0,WIDTH,HEIGHT);

        for(int i=0 ; i<200; i++){
            int x = (int)(Math.random()*WIDTH);
            int y = (int)(Math.random()+HEIGHT);
            graphics.setColor(getRamdomColor());
            graphics.drawOval(x,y,1,1);
        }
    }

    private static void drawRands(Graphics graphics, char[] verifyCode) {
        graphics.setFont(new Font("Console",Font.BOLD , FONT_SIZE));

        for(int i=0; i<verifyCode.length ;i++){
            graphics.setColor(getRamdomColor());
            graphics.drawString(""+verifyCode[i],i*FONT_SIZE+10,25);
        }
    }

    private static Color getRamdomColor() {
        Random random = new Random();
        return
                new Color(random.nextInt(220),random.nextInt(220),random.nextInt(220));
    }

    private static char[] generateCheckCode() {
        String chars= "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        char[]rands = new char[4];
        for(int i= 0 ;i<4;i++){
            int rand = (int)(Math.random()*(10+26));
            rands[i] = chars.charAt(rand);
        }
        return  rands;
    }

    public static char[] getVerifyCode(){
        return verifyCode;
    }
}

3.实现发送邮件功能的Controller

package com.example.demo.controller;

import com.alibaba.fastjson.JSONObject;
import com.example.demo.service.impl.MyUserDetailsService;
import com.example.demo.utils.CreateVerifyCodeImage;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import java.awt.image.BufferedImage;

@RestController
public class EmailController {
    @Autowired
    JavaMailSenderImpl javaMailSender;

    @Autowired
    private MyUserDetailsService myUserDetailsService;

    @ResponseBody
    @RequestMapping("/email/register")
    public Object sendEmailForRegisterUser(HttpServletRequest request){
        JSONObject jsonObject = new JSONObject();
        String email = request.getParameter("email");
        boolean exsitEmail = myUserDetailsService.existEmail(email);
        if(exsitEmail){
            jsonObject.put("code",0);
            jsonObject.put("message","该邮箱已经被注册");
            return jsonObject;
        }
        BufferedImage verifyCodeImage = CreateVerifyCodeImage.getVerifyCodeImage();
        String verifyCode = String.valueOf(CreateVerifyCodeImage.getVerifyCode());

        request.getSession().setAttribute("verifyCode",verifyCode);
        SimpleMailMessage message = new SimpleMailMessage();
        message.setSubject("账号注册验证");
        message.setText("您好，您的验证码是："+verifyCode);
        message.setTo(email);
        message.setFrom("qin7899@qq.com");
        javaMailSender.send(message);

        jsonObject.put("code",1);
        jsonObject.put("message","已经发送邮件");
        return jsonObject;
    }
}

4.配置发送邮件的邮箱

QQ方面

spring.mail.username=邮箱账号
spring.mail.password=个人邮箱授权码
spring.mail.host=smtp.qq.com

如何打开QQ的发送邮件功能参考

其他邮箱也可以用于发送邮件