<!-- 發(fā)郵件 -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

# 發(fā)送郵件配置
mail:
  # 發(fā)件人地址
  user: 23734xxxxxx@qq.com
  # 發(fā)件人授權(quán)碼
  password: pfemtwstpvkdabcd

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

/**
 * 發(fā)郵件工具類
 */
@Component
public final class MailUtils {
    @Value("${mail.user}")
    private String USER; // 發(fā)件人郵箱地址
    @Value("${mail.password}")
    private String PASSWORD; // 如果是qq郵箱可以使戶端授權(quán)碼

    /**
     * 發(fā)送郵件
     * @param to 收件人郵箱
     * @param text 郵件正文
     * @param title 標(biāo)題
     */
    public boolean sendMail(String to, String text, String title){
        try {
            final Properties props = new Properties();
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.host", "smtp.qq.com");

            // 發(fā)件人的賬號
            props.put("mail.user", USER);
            //發(fā)件人的密碼
            props.put("mail.password", PASSWORD);

            // 構(gòu)建授權(quán)信息，用于進(jìn)行SMTP進(jìn)行身份驗證
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 用戶名、密碼
                    String userName = props.getProperty("mail.user");
                    String password = props.getProperty("mail.password");
                    return new PasswordAuthentication(userName, password);
                }
            };
            // 使用環(huán)境屬性和授權(quán)信息，創(chuàng)建郵件會話
            Session mailSession = Session.getInstance(props, authenticator);
            // 創(chuàng)建郵件消息
            MimeMessage message = new MimeMessage(mailSession);
            // 設(shè)置發(fā)件人
            String username = props.getProperty("mail.user");
            InternetAddress form = new InternetAddress(username);
            message.setFrom(form);

            // 設(shè)置收件人
            InternetAddress toAddress = new InternetAddress(to);
            message.setRecipient(Message.RecipientType.TO, toAddress);

            // 設(shè)置郵件標(biāo)題
            message.setSubject(title);

            // 設(shè)置郵件的內(nèi)容體
            message.setContent(text, "text/html;charset=UTF-8");
            // 發(fā)送郵件
            Transport.send(message);
            return true;
        }catch (Exception e){
            e.printStackTrace();
        }
        return false;
    }

}

<dependency>
			<groupId>com.github.penggle</groupId>
			<artifactId>kaptcha</artifactId>
			<version>2.3.2</version>
		</dependency>

import com.google.code.kaptcha.Producer;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

/**
 * 生成驗證碼的配置
 */
@Configuration
public class KaptchaConfig {
    @Bean
    public Producer kaptchaProducer() {
        Properties properties = new Properties();
        //設(shè)置驗證碼的寬度
        properties.setProperty("kaptcha.image.width", "100");
        //設(shè)置寬度
        properties.setProperty("kaptcha.image.height", "40");
        //設(shè)置字體大小
        properties.setProperty("kaptcha.textproducer.font.size", "32");
        //設(shè)置字體顏色
        properties.setProperty("kaptcha.textproducer.font.color", "0,0,0");
        //限定驗證碼中的字符
        properties.setProperty("kaptcha.textproducer.char.string", "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
        //設(shè)置驗證碼的長度
        properties.setProperty("kaptcha.textproducer.char.length", "4");
        //設(shè)置添加噪聲與否
        properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
        //將配置裝載到一個實例中
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        //將配置傳入實例
        defaultKaptcha.setConfig(new Config(properties));
        return defaultKaptcha;
    }
}

	@Autowired
	private Producer checkCode;
	@Test
	void contextLoads() {
		String text = checkCode.createText();
		System.out.println(true);
	}