Java实现发送邮件

引入jar包

	<dependency>
   		<groupId>com.sun.mail</groupId>
       	<artifactId>javax.mail</artifactId>
        <version>1.6.2</version>
    </dependency>

# 发送邮件配置
mail:
  smtp:
    host: smtp.163.com
    port: 25
    auth: true
    username: 139*****@163.com
    password: *****
    from: 139*****@163.com
    name: *****

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.util.ByteArrayDataSource;


@Component
@Slf4j
public class EmailUtil {

	private static Environment environment;

	@Autowired
	public void setEnvironment(Environment environment) {
		EmailUtil.environment = environment;
	}

	public static Session createSession() {

		//	账号信息
		String username = environment.getProperty("mail.smtp.username");//	邮箱发送账号
		String password = environment.getProperty("mail.smtp.password");//	邮箱授权码

		//	创建一个配置文件，并保存
		Properties props = new Properties();

		//	SMTP服务器连接信息
		props.put("mail.smtp.host", environment.getProperty("mail.smtp.host"));//	SMTP主机名
        //  126——25
        //  163——465 163也可以用的25
		props.put("mail.smtp.port", environment.getProperty("mail.smtp.port"));//	主机端口号
		props.put("mail.smtp.auth", environment.getProperty("mail.smtp.auth"));//	是否需要用户认证
//		props.put("mail.smtp.starttls.enale", "true");//	启用TlS加密 暂时不用

		//	创建session会话
		//	参数1:smtp服务器连接参数
		//	参数2:账号和密码的授权认证对象
		Session session = Session.getInstance(props, new Authenticator() {
			@Override
			protected PasswordAuthentication getPasswordAuthentication() {
				// TODO Auto-generated method stub
				return new PasswordAuthentication(username, password);
			}
		});
		//  控制台打印调试信息
		session.setDebug(true);
		return session;
	}


	/**
	 * 发送纯文本邮件信息
	 *
	 * @param receiver 接收方（邮箱账号）
	 * @param subject  邮件主题
	 * @param content  邮件内容（发送内容）
	 */
	public void sendMessage(String receiver, String subject, String content) {
		//1.创建Session
		try {
			Session session = createSession();
			System.out.println(session);

			//2.创建邮件对象
			MimeMessage message = new MimeMessage(session);
			//设置邮件主题
			message.setSubject(subject);
			//设置邮件内容
			message.setText(content);
			//设置发件人
			String from = environment.getProperty("mail.smtp.from");
			String name = environment.getProperty("mail.smtp.name");
			message.setFrom(new InternetAddress(from,name));
			//设置收件人
			message.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(receiver));

			//3.发送邮件
			Transport.send(message);
		} catch (AddressException e) {
			e.printStackTrace();
		} catch (MessagingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

    }

	/**
	 * 发送带附件邮件信息
	 *
	 * @param receiver 接收方（邮箱账号）
	 * @param subject  邮件主题
	 * @param content  邮件内容（发送内容）
	 */
	public void sendAnnexMessage(String receiver, String subject, String content,String fileName, String filePath) {
		try {
			//1.创建Session会话
			Session session = createSession();

			//2.创建邮件对象
			MimeMessage message = new MimeMessage(session);
			message.setSubject(subject);
			//设置发件人
			String from = environment.getProperty("mail.smtp.from");
			String name = environment.getProperty("mail.smtp.name");
			message.setFrom(new InternetAddress(from,name));
			message.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(receiver));

			//设置正文
			BodyPart textPart = new MimeBodyPart();
			//设置正文内容
			textPart.setText(content);

			//设置附件
			BodyPart filePart = new MimeBodyPart();
			filePart.setFileName(fileName);
			filePart.setDataHandler(
				new DataHandler(
					new ByteArrayDataSource(
						Files.readAllBytes(Paths.get(filePath)), "application/octet-stream")));

			//整合正文和附件
			Multipart part = new MimeMultipart();
			part.addBodyPart(textPart);
			part.addBodyPart(filePart);

			//添加正文和邮件
			message.setContent(part);
			//3.发送邮件
			Transport.send(message);
		} catch (AddressException e) {
			e.printStackTrace();
		} catch (MessagingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}


}