一.邮件收发
1.什么是电子邮件
2.传输协议
3.邮件收发原理
二.开发
1.导入jar包
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mail.jar
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activation.jar
<dependency> <groupId>javax.mail</groupId> <artifactId>mail</artifactId> <version>1.4.7</version> </dependency>
<dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> </dependency>
注:QQ邮箱开启POP3和SMTP服务还有授权码
2.案例一:发送简单邮件
1 import com.sun.mail.util.MailSSLSocketFactory; 2 3 import javax.mail.*; 4 import javax.mail.internet.InternetAddress; 5 import javax.mail.internet.MimeMessage; 6 import java.io.UnsupportedEncodingException; 7 import java.security.GeneralSecurityException; 8 import java.util.Properties; 9 10 //发送一份简单的邮件 11 public class MailDemo01 { 12 13 public static void main(String[] args) throws GeneralSecurityException, MessagingException, UnsupportedEncodingException { 14 15 Properties prop = new Properties(); 16 prop.setProperty("mail.host","smtp.qq.com"); //设置QQ邮箱服务器 17 prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议 18 prop.setProperty("mail.smtp.auth","true"); //需要验证用户名和密码 19 20 //关于QQ邮箱,还要设置SSL加密,加上以下代码即可,只有QQ邮箱需要其他邮箱不需要 21 MailSSLSocketFactory sf = new MailSSLSocketFactory(); 22 sf.setTrustAllHosts(true); 23 prop.put("mail.smtp.ssl.enable","true"); 24 prop.put("mail.smt;.ssl.socketFactory",sf); 25 26 27 //使用JavaMail发送邮件5个步骤 28 //1.创建定义整个应用程序所需的环境信息的Session对象 29 30 //QQ 才需要,其他邮箱不需要 31 Session session = Session.getDefaultInstance(prop, new Authenticator() { 32 @Override 33 protected PasswordAuthentication getPasswordAuthentication() { 34 //发件人邮件用户名和授权码 35 return new PasswordAuthentication("464407764@qq.com","hmiauriqbvzmbhcf"); 36 } 37 }); 38 39 //开启Session的debug模式,这样就可以查看到程序发送Email的运行状态 40 session.setDebug(true); 41 42 //2.通过Session得到transport对象 43 Transport ts = session.getTransport(); 44 45 //3.使用邮箱的用户名和授权码连上邮件服务器 46 ts.connect("smtp.qq.com","464407764@qq.com","hmiauriqbvzmbhcf"); 47 48 //4.创建邮件:写邮件 49 MimeMessage message = new MimeMessage(session); 50 51 //指明邮件的发送者 52 message.setFrom(new InternetAddress("464407764@qq.com","海天之恋", "UTF-8")); 53 54 //指明邮件的接收者 55 message.setRecipient(Message.RecipientType.TO,new InternetAddress("18855162320@163.com")); 56 57 //邮件标题 58 message.setSubject("这是简单邮件案例的邮件标题!"); 59 60 //邮件内容 61 message.setContent("<h1 style='color: red'>这是简单邮件案例的邮件内容</h1>","text/html;charset=UTF-8"); 62 63 //5.发送邮件 64 ts.sendMessage(message,message.getAllRecipients()); 65 66 //6.关闭连接 67 ts.close(); 68 69 } 70 }
3.案例二:发送复杂邮件(带附件和图片)
1 import com.sun.mail.util.MailSSLSocketFactory; 2 3 import javax.activation.DataHandler; 4 import javax.activation.FileDataSource; 5 import javax.mail.*; 6 import javax.mail.internet.InternetAddress; 7 import javax.mail.internet.MimeBodyPart; 8 import javax.mail.internet.MimeMessage; 9 import javax.mail.internet.MimeMultipart; 10 import java.io.UnsupportedEncodingException; 11 import java.security.GeneralSecurityException; 12 import java.util.Properties; 13 14 //发送一份复杂的邮件 15 public class MailDemo02 { 16 17 public static void main(String[] args) throws GeneralSecurityException, MessagingException, UnsupportedEncodingException { 18 19 Properties prop = new Properties(); 20 prop.setProperty("mail.host","smtp.qq.com"); //设置QQ邮箱服务器 21 prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议 22 prop.setProperty("mail.smtp.auth","true"); //需要验证用户名和密码 23 24 //关于QQ邮箱,还要设置SSL加密,加上以下代码即可,只有QQ邮箱需要其他邮箱不需要 25 MailSSLSocketFactory sf = new MailSSLSocketFactory(); 26 sf.setTrustAllHosts(true); 27 prop.put("mail.smtp.ssl.enable","true"); 28 prop.put("mail.smt;.ssl.socketFactory",sf); 29 30 31 //使用JavaMail发送邮件5个步骤 32 //1.创建定义整个应用程序所需的环境信息的Session对象 33 34 //QQ 才需要,其他邮箱不需要 35 Session session = Session.getDefaultInstance(prop, new Authenticator() { 36 @Override 37 protected PasswordAuthentication getPasswordAuthentication() { 38 //发件人邮件用户名和授权码 39 return new PasswordAuthentication("464407764@qq.com","hmiauriqbvzmbhcf"); 40 } 41 }); 42 43 //开启Session的debug模式,这样就可以查看到程序发送Email的运行状态 44 session.setDebug(true); 45 46 //2.通过Session得到transport对象 47 Transport ts = session.getTransport(); 48 49 //3.使用邮箱的用户名和授权码连上邮件服务器 50 ts.connect("smtp.qq.com","464407764@qq.com","hmiauriqbvzmbhcf"); 51 52 //4.创建邮件:写邮件 53 MimeMessage message = new MimeMessage(session); 54 55 //指明邮件的发送者 56 message.setFrom(new InternetAddress("464407764@qq.com","海天之恋", "UTF-8")); 57 58 //指明邮件的接收者 59 message.setRecipient(Message.RecipientType.TO,new InternetAddress("18855162320@163.com")); 60 61 //邮件标题 62 message.setSubject("这是复杂邮件案例的邮件标题!"); 63 64 //邮件内容 65 //================================================================================ 66 67 //发送图片 68 // sendImage(message); 69 //发送附件,图片和文本 70 sendAttachmentsAndImage(message); 71 72 //================================================================================ 73 74 //5.发送邮件 75 ts.sendMessage(message,message.getAllRecipients()); 76 77 //6.关闭连接 78 ts.close(); 79 80 } 81 82 public static void sendImage(MimeMessage message) throws MessagingException { 83 //准备图片数据 84 MimeBodyPart image = new MimeBodyPart(); 85 DataHandler dh = new DataHandler(new FileDataSource(MailDemo02.class.getResource("/").getPath()+"/1.jpg"));//图片需要经过数据处理 86 image.setDataHandler(dh);//在Body中放入处理过后的图片 87 image.setContentID("myPicture");//给图片设置一个ID(随意设置) 88 89 //准备正文数据 90 MimeBodyPart text = new MimeBodyPart(); 91 text.setContent("这是一封邮件正文带图片<img src='cid:myPicture'>的邮件","text/html;charset=UTF-8");//通过cid获得ContentID 92 93 //描述数据关系 94 MimeMultipart mm = new MimeMultipart(); 95 mm.addBodyPart(text); 96 mm.addBodyPart(image); 97 mm.setSubType("related"); 98 99 //设置到消息中,保存修改 100 message.setContent(mm);//把最后编辑好的邮件放入消息中 101 message.saveChanges(); 102 } 103 104 public static void sendAttachmentsAndImage(MimeMessage message) throws MessagingException { 105 //图片 106 MimeBodyPart body1 = new MimeBodyPart(); 107 body1.setDataHandler(new DataHandler(new FileDataSource(MailDemo02.class.getResource("/").getPath()+"/1.jpg")));//在Body中放入处理过后的图片 108 body1.setContentID("myPicture");//给图片设置一个ID(随意设置) 109 110 //文本 111 MimeBodyPart body2 = new MimeBodyPart(); 112 body2.setContent("这是一封邮件正文带图片<img src='cid:myPicture'>的邮件","text/html;charset=UTF-8");//通过cid获得ContentID 113 114 //附件 115 MimeBodyPart body3 = new MimeBodyPart(); 116 body3.setDataHandler(new DataHandler(new FileDataSource(MailDemo02.class.getResource("/").getPath() + "/1.txt"))); 117 body3.setFileName("myAttachments.txt");//设置附件名 118 119 //1.现将文本和图片拼装 120 MimeMultipart multipart1 = new MimeMultipart(); 121 multipart1.addBodyPart(body2); //文本 122 multipart1.addBodyPart(body1); //图片 123 multipart1.setSubType("related"); 124 125 MimeBodyPart contentText = new MimeBodyPart(); 126 contentText.setContent(multipart1); 127 128 //2.拼接附件 129 MimeMultipart allFile = new MimeMultipart(); 130 allFile.addBodyPart(body3); //附件 131 allFile.addBodyPart(contentText); //文本+图片 132 allFile.setSubType("mixed"); 133 134 //设置到消息中,保存修改 135 message.setContent(allFile);//把最后编辑好的邮件放入消息中 136 message.saveChanges(); 137 } 138 139 }
4.总结
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在应用场景中我们一般使用多线程处理发送邮件,将主要代码放在run方法中,防止发送时卡顿。
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理解思路其次是程序
来源:https://www.cnblogs.com/zhihaospace/p/12319805.html