java代码邮件发送从简单到项目

青旅半醒 2022-12-21 14:53 150阅读 0赞

#### 简单的邮件发送 ####

首先要对发件人邮箱进行授权码，在设置中打开协议  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70 1]

package com.ruby.controller;
    import javax.mail.Message;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;
    import java.util.Properties;
    
    /** * @Description 简单邮件发送 * @Author Ruby * @Date 2020/11/16 13:07 * @Version 1.0 */
    public class JavaMail { 
    
        public static void main(String[] args) throws Exception { 
            Properties properties = new Properties();
            //发送服务器需要身份验证
            properties.setProperty("mail.smtp.auth", "true");
            // 发送邮件协议名称
            properties.setProperty("mail.transport.protocol", "smtp");
            // smtp服务器地址
            properties.put("mail.smtp.host", "smtp.163.com");
            
           //使用JavaMail发送邮件的5个步骤
            //1.创建定义整个应用程序所需的环境信息的 Session 对象
            Session session = Session.getInstance(properties);
            // 设置为debug模式, 可以查看详细的发送 log
            session.setDebug(true);
            //2.通过session得到transport对象
            //发件人邮箱授权码
            Transport transport = session.getTransport();
            //3、使用邮箱的用户名和授权码连上邮件服务器
            transport.connect("******fa@163.com","****（代表授权码)");
           //4、创建邮件
            //邮件内容
            Message msg = new MimeMessage(session);
            msg.setSubject("邮件标题");
            msg.setText("邮件内容");
            //发件人邮箱
            msg.setFrom(new InternetAddress("******fa@163.com"));
            //收件人邮箱
            msg.setRecipient(Message.RecipientType.TO,
                    new InternetAddress("******shou@163.com"));
            msg.saveChanges();
           //5、发送邮件
            transport.sendMessage(msg, msg.getAllRecipients());
    
            System.out.println("邮件发送成功...");
            transport.close();
        }
    }

如果没有打开授权码就会有报这种问题  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70_pic_center]  
正常执行之后的程序是  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70_pic_center 1]

邮件如图所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70_pic_center 2]

#### spring 整合发送邮件 ####

配置jar包

<dependency>
       <groupId>javax.mail</groupId>
       <artifactId>mail</artifactId>
       <version>1.5.0-b01</version>
    </dependency>

/**配置类 */
    package com.ruby.config;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.mail.SimpleMailMessage;
    import org.springframework.mail.javamail.JavaMailSender;
    import org.springframework.mail.javamail.JavaMailSenderImpl;
    
    import java.util.Properties;
    @Configuration
    public class MailConfig { 
    private static final String emailProtocol= **;
    private static final String emailHost= **;
    //邮箱名称
    private static final String emailUsername= **;
    //邮箱密码
    private static final String emailPassword= **;
        @Bean
        public JavaMailSender javaMailSender() { 
            JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();
            javaMailSender.setProtocol(emailProtocol);
            javaMailSender.setHost(emailHost);
            javaMailSender.setPort(emailPort);
            javaMailSender.setUsername(emailUsername);
            javaMailSender.setPassword(emailPassword);
            javaMailSender.setDefaultEncoding("UTF-8");
            Properties javaMailProperties = new Properties();
            javaMailProperties.put("mail.auth", true);
            javaMailProperties.put("mail." + emailProtocol + ".timeout", 3000);
            javaMailSender.setJavaMailProperties(javaMailProperties);
            return javaMailSender;
        }

package com.ruby.send;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    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.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import javax.mail.internet.MimeMessage;
    
    /** * @Description * @Author Ruby * @Date 2020/11/27 16:21 * @Version 1.0 */
    @Controller
    @RequestMapping("send")
    public class send{ 
        private final Logger log = LoggerFactory.getLogger(this.getClass());
        @Autowired
        private JavaMailSender javaMailSender;
    
       //发送方邮箱名称
       private static final String emailUsername= **;
      private static final String UA = "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)";
       private String appendixUrl =**;
    
        /** * 发送邮件 */
        @RequestMapping("/sendMail")
        @ResponseBody
        public boolean sendMail() { 
                try { 
                    MimeMessage mimeMessage = javaMailSender.createMimeMessage();
                    MimeMessageHelper messageHelper = new MimeMessageHelper(mimeMessage, true);
                    messageHelper.setFrom(emailUsername);
                   //接收方邮箱名称 
                    messageHelper.setTo("**");
                    messageHelper.setSubject("你好");
                    messageHelper.setText("这是一封邮件");
                    javaMailSender.send(mimeMessage);
                    log.info("1111111111");
                } catch (Exception e) { 
                    log.error("邮件发送异常: ", e);
                    return false;
                }
            return true;
        }
    
        /** * 发送带附件的邮件 */
        @RequestMapping("/sendAttachMail")
        @ResponseBody
        public boolean sendAttachMail() { 
            try { 
                MimeMessage mimeMessage = javaMailSender.createMimeMessage();
                MimeMessageHelper messageHelper = new MimeMessageHelper(mimeMessage, true);
                messageHelper.setFrom(emailUsername);
                //接收方的邮件地址
                messageHelper.setTo("**");
                messageHelper.setSubject("你好");
                messageHelper.setText("这是一封邮件");
                URLConnection httpURLConnection = null;
                try { 
                    httpURLConnection = getInputStreamByUrl(appendixUrl);
                    InputStream inputStream = httpURLConnection.getInputStream();
                    //取文件名称
                    Map<String, List<String>> headerFields = httpURLConnection.getHeaderFields();
                    //格式：Content-Disposition: attachment; filename=”fname.ext”
                    if (Objects.nonNull(headerFields) && headerFields.containsKey("Content-Disposition")) { 
                        List<String> strings = headerFields.get("Content-Disposition");
                        if (!CollectionUtils.isEmpty(strings)) { 
                            String oriFileName = strings.iterator().next();
                            // String.indexOf("")判断索引下标从几开始
                            String fileName = oriFileName.substring(oriFileName.indexOf("filename=") + "filename=".length());
                            messageHelper.addAttachment(URLDecoder.decode(fileName, CommonConstant.CHARSET_UTF8), new ByteArrayResource(transInputStream(inputStream)));
                        }
                    }
                } finally { 
                    if (Objects.nonNull(httpURLConnection)) { 
                        if (httpURLConnection instanceof HttpURLConnection) { 
                            ((HttpURLConnection) httpURLConnection).disconnect();
                        } else { 
                            ((HttpsURLConnection) httpURLConnection).disconnect();
                        }
                    }
                }
                javaMailSender.send(mimeMessage);
                log.info("1111111111");
            } catch (Exception e) { 
                log.error("邮件发送异常: ", e);
                return false;
            }
            return true;
        }
    
        private URLConnection getInputStreamByUrl(String appendixUrl) throws IOException { 
            URL url = new URL(appendixUrl);
            //创建http链接
            URLConnection conn = url.openConnection();
            //设置超时间为5秒
            conn.setConnectTimeout(5 * 1000);
            //防止屏蔽程序抓取而返回403错误
            conn.setRequestProperty("User-Agent", UA);
            return conn;
        }
    
        /** * 转换流:需要关闭conn的连接，需要手动转换is * * @param is * @return * @throws IOException */
        private static byte[] transInputStream(InputStream is) throws IOException { 
            //data用于存放循环读取的临时数据
            byte[] data = new byte[2048];
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            BufferedInputStream entryStream = new BufferedInputStream(is, 2048);
            int len= 0;
            while ((len = entryStream.read(data, 0, 2048)) != -1) { 
                bos.write(data, 0, len);
            }
            entryStream.close();
            bos.close();
            return bos.toByteArray();
        }
    }

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