Java发送邮件_java msg.getallrecipients()空指针

作者：weixin_40725706 | 2024-06-16 21:32:43

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java msg.getallrecipients()空指针

1.发送简单文本邮件

1）导入jar包


		<dependency>
			<groupId>javax.mail</groupId>
			<artifactId>javax.mail-api</artifactId>
			<version>1.6.2</version>
		</dependency>
		<dependency>
			<groupId>javax.activation</groupId>
			<artifactId>activation</artifactId>
			<version>1.1.1</version>
		</dependency>

2）上代码


package com.test;
 
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
 
public class SendEmail {
 
    public static void SendEmail(String sendAddress, String title, String content, String copysendAddress) throws MessagingException {
        Properties properties = new Properties();
        // 设置服务器名称
        properties.setProperty("mail.host","smtp.qq.com");
        // 设置文件传输协议
        properties.setProperty("mail.transport.protocol", "smtp");
        // 设置是否要验证服务器用户名和密码
        properties.setProperty("mail.smtp.auth", "true");
        // 1.创建客户端与邮箱服务器的Session对象
        Session session = Session.getInstance(properties);
        // 2.开启 session 的 debug 模式，方便查看发送 email 的运行状态
        session.setDebug(true);
        // 3.通过 session 得到 transport 传输对象
        Transport transport = session.getTransport();
        // 4.使用用户名、授权码连接上邮箱服务器，此处的授权码需要到邮箱开启服务设置
        transport.connect("smtp.qq.com","xxx@qq.com","xxx");// 授权码
        // 5.创建邮件
        Message message = createSimpleMail(session, sendAddress ,title, content, copysendAddress);
        // 6.发送邮件
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
 
    }
 
    private static Message createSimpleMail(Session session, String sendAddress, String title, String content, String copysendAddress) throws MessagingException {
        // 创建邮件对象
        MimeMessage message = new MimeMessage(session);
        // 指明邮件的发件人
        message.setFrom(new InternetAddress("xxx@qq.com"));
        // 指明邮件的收件人
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(sendAddress));
        // 邮件的标题
        message.setSubject(title);
        // 邮件的内容
        message.setContent(content, "text/html;charset=UTF-8");
        // 设置抄送人
        message.setRecipients(Message.RecipientType.CC, InternetAddress.parse(copysendAddress));
 
        return message;
    }
 
    public static void main(String[] args) throws MessagingException {
        SendEmail("xxx@qq.com", "邮件发送演示", "邮件内容", "xxx2@qq.com");
    }
 
}

2.SpringBoot JavaMailSender发送html文本、附件邮件

https://blog.csdn.net/zongmaomx/article/details/105278668

https://blog.csdn.net/qq_31281189/article/details/97760951

2.1 SpringBoot使用JavaMailSender发送普通文本邮件

application.yml配置


# 发送邮件
spring:
  mail:
    # 邮箱账号
    username: xxx@qq.com
    # 操作码
    password: xxx
    host: smtp.qq.com

1）pom.xml配置


<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.4</version>
    </parent>
    <groupId>com.yu</groupId>
    <artifactId>spring-test01</artifactId>
    <version>1.0-SNAPSHOT</version>
 
    <dependencies>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
 
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
 
    </dependencies>
 
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2）model


package com.yu.model;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
 
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Email {
 
    private String title;
 
    private String content;
 
    private String to;
 
}

3)Controller


package com.yu.controller;
 
import com.yu.model.Email;
import com.yu.service.EmailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import javax.mail.MessagingException;
 
@RestController
@RequestMapping("/test")
public class TestController {
 
    @Autowired
    private EmailService emailService;
 
    @RequestMapping("sendEmail")
    public String sendEmail() throws MessagingException {
        Email email = new Email();
        email.setTo("xxx@qq.com");
        email.setTitle("发邮件测试003");
        email.setContent("发邮件测试内容003");
 
        emailService.sendEmail(email);
        return "ok";
    }
}

4)Service


package com.yu.service;
 
import com.yu.model.Email;
 
import javax.mail.MessagingException;
 
public interface EmailService {
 
    public void sendEmail(Email email) throws MessagingException;
 
}

5)ServiceImpl


package com.yu.service.impl;
 
import com.yu.model.Email;
import com.yu.service.EmailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
 
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
 
@Service
public class EmailServiceImpl implements EmailService {
 
    @Autowired
    private JavaMailSender javaMailSender;
 
    @Value("${spring.mail.username}")
    private String fromEmail;
 
    public void sendEmail(Email email) throws MessagingException {
        // 1.创建一个MimeMessage
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        // 2.发送邮件的一个工具类
        MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage);
 
        mimeMessageHelper.setTo(email.getTo());
        mimeMessageHelper.setSubject(email.getTitle());
        mimeMessageHelper.setText(email.getContent());
        mimeMessageHelper.setFrom(fromEmail);
 
        javaMailSender.send(mimeMessage);
    }
}

6)单元测试


package com.yu;
 
import com.yu.model.Email;
import com.yu.service.EmailService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
 
import javax.mail.MessagingException;
 
@SpringBootTest
public class sendEmailTest {
    //  能正常注册bean
    @Autowired
    private EmailService emailService;
 
    @Test
    public void Test() throws MessagingException {
        Email email = new Email();
        email.setTo("xxx@qq.com");
        email.setTitle("发邮件测试006");
        email.setContent("发邮件测试内容006");
        emailService.sendEmail(email);
    }
 
}

2.2 .xlsx附件(待完成)


package com.yu.service.impl;
 
import com.yu.model.Email;
import com.yu.service.EmailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
 
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
 
@Service
public class EmailServiceImpl implements EmailService {
 
    @Autowired
    private JavaMailSender javaMailSender;
 
    @Value("${spring.mail.username}")
    private String fromEmail;
 
    public void sendEmail(Email email) throws MessagingException {
        // 1.创建一个MimeMessage
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        // 2.发送邮件的一个工具类
        MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage);
 
        mimeMessageHelper.setTo(email.getTo());
        mimeMessageHelper.setSubject(email.getTitle());
        mimeMessageHelper.setText(email.getContent(), true);
        mimeMessageHelper.setFrom(fromEmail);
 
        MultipartFile multipartFile = createWorkbookAndConvertMultipartFile(email.getTitles(), eamil.getList());
        mimeMessageHelper.addAttachment(email.getFileName(), multipartFile);
        javaMailSender.send(mimeMessage);
    }
 
    /*
     * 将数据生成 Workbook 并转成 MultipartFile
     *
     * @param titles
     * @param MultipartFile
     */
public MultipartFile  createWorkbookAndConvertMultipartFile(String titles[], List<String> list) {
        //簿
        Workbook workbook = new SXSSFWorkbook();
        //表
        Sheet sheet = workbook.createSheet();
 
        // 写title
        Row row0 = sheet.createRow(0);
        for (int i = 0; i < titles.length; i++) {
            Cell cell = row0.createCell(i);
            cell.setCellValue(titles[i]);
        }
        // 写数据(省略)
 
MultipartFile multipartFile = null;
        try {
            ByteArrayOutputStream oup = new ByteArrayOutputStream();
            workbook.write(oup);
            byte[] bytes = oup.toByteArray();
            InputStream inputStream = new ByteArrayInputStream(bytes);
            multipartFile = new MockMultipartFile("name", "name", "name", inputStream);
 
            oup.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 清除临时文件
        ((SXSSFWorkbook) workbook).dispose();
        long end = System.currentTimeMillis();
        System.out.println((double) (end - begin) / 1000);
        return multipartFile;
    }
 
    
}

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