在推广当中一定会用到的武器，那就是发送大量的营销性质的邮件。对于个人站长来说，也会用到，用于推广的自己的站点。同时由于搭建smtp服务器需要一定的技术及成本，为此我们可以利用一些免费的smtp服务器。比如说，新浪邮箱、网易邮箱、雅虎邮箱等等都会提供smtp服务，但是免费的smtp服务器会有发送邮件数目的限制，为此需要申请很多这样的邮箱，然后随机挑选一个邮箱来发送邮件。

 基上以上的这些需求，我编写了一个利用线程池，随机挑选发信箱的批量邮件发送器。在此分享给各位学友。。。

EmailConfig.java

这是发信邮件的配置类：

package com.tongtongxue.mail;public class EmailConfig {private String username;private String password;private String smtpHost;private String serverPort;private boolean isSSL;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getSmtpHost() {return smtpHost;}public void setSmtpHost(String smtpHost) {this.smtpHost = smtpHost;}public String getServerPort() {return serverPort;}public void setServerPort(String serverPort) {this.serverPort = serverPort;}public boolean isSSL() {return isSSL;}public void setSSL(boolean isSSL) {this.isSSL = isSSL;}
}

EmailContent.java

这是邮件内容的封装类：

package com.tongtongxue.mail;public class EmailContent {private String subject;private String content;public String getSubject() {return subject;}public void setSubject(String subject) {this.subject = subject;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}
}

EmailAuthenticator.java

这是用于发信邮件的用户名密码校验类：

package com.tongtongxue.mail;import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;public class EmailAuthenticator extends Authenticator {private String username;private String password;public EmailAuthenticator() {}public EmailAuthenticator(String username, String password) {this.username = username;this.password = password;}@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(username, password);}
}

RandomUtil.java

这是产生随机数的工具类：

package com.tongtongxue.mail;import java.util.Random;public class RandomUtil {public static int getRandomInt(int size) {Random random = new Random();return random.nextInt(size);}
}

EmailHelper.java

这是邮件发送器的核心类：

package com.tongtongxue.mail;import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;public class EmailHelper {private ExecutorService executorService;public EmailHelper() {// 默认启动线程个数为10的线程池executorService = Executors.newFixedThreadPool(10);}public EmailHelper(int num) {// 指定初始化线程个数为num的线程池executorService = Executors.newFixedThreadPool(num);}public void sendMail(List receiveAdds, List emailConfigs, EmailContent emailContent) {// 用于发送邮件的邮箱配置个数int size = emailConfigs.size();// 循环待发送的邮箱地址for (String receiveAdd : receiveAdds) {// 随机获取一个用于发送邮件的邮箱配置EmailConfig emailConfig = emailConfigs.get(RandomUtil.getRandomInt(size));executorService.execute(new EmailItem(emailConfig, emailContent, receiveAdd));}}public void shutdown() {executorService.shutdown();}/*** 这个内部类，是真正用于发送邮件*/class EmailItem implements Runnable {private EmailConfig emailConfig;private EmailContent emailContent;private String receiveAdd;public EmailItem(EmailConfig emailConfig, EmailContent emailContent, String receiveAdd) {this.emailConfig = emailConfig;this.emailContent = emailContent;this.receiveAdd = receiveAdd;}@Overridepublic void run() {Properties prop = new Properties();prop.put("mail.smtp.host", emailConfig.getSmtpHost());prop.put("mail.smtp.port", emailConfig.getServerPort());prop.put("mail.smtp.auth", "true");String username = emailConfig.getUsername();EmailAuthenticator authenticator = new EmailAuthenticator(username, emailConfig.getPassword());// 如果需要ssl来发送邮件，则if (emailConfig.isSSL()) {prop.put("mail.smtp.socketFactory.port", emailConfig.getServerPort());prop.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");}// 根据邮件会话属性和密码验证器构造一个发送邮件的sessionSession sendMailSession = Session.getDefaultInstance(prop, authenticator);sendMailSession.setDebug(false);try {// 根据session创建一个邮件消息Message mailMessage = new MimeMessage(sendMailSession);// 设置自定义发件人昵称String nick = MimeUtility.encodeText("通通学");// 创建邮件发送者地址Address from = new InternetAddress(nick + " ");// 设置邮件消息的发送者mailMessage.setFrom(from);// 创建邮件的接收者地址，并设置到邮件消息中Address to = new InternetAddress(receiveAdd);// Message.RecipientType.TO属性表示接收者的类型为TOmailMessage.setRecipient(Message.RecipientType.TO, to);// 设置邮件消息的主题mailMessage.setSubject(emailContent.getSubject());// 设置邮件消息发送的时间mailMessage.setSentDate(new Date());// MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象Multipart mainPart = new MimeMultipart();// 创建一个包含HTML内容的MimeBodyPartBodyPart html = new MimeBodyPart();// 设置HTML内容html.setContent(emailContent.getContent(), "text/html; charset=utf-8");mainPart.addBodyPart(html);// 将MiniMultipart对象设置为邮件内容mailMessage.setContent(mainPart);// 发送邮件Transport.send(mailMessage);} catch (Exception e) {e.printStackTrace();}}}
}

Main.java

这是用于测试的类：

package com.tongtongxue.mail;import java.util.ArrayList;
import java.util.List;/*** 用于测试发送邮件的类*/
public class Main {public static void main(String[] args) {// 初始化用于发送邮件的邮箱配置List emailConfigs = initEmailConfigs();// 初始化接收邮件的email地址List receiveAdds = initReceiveAdds();// 初始化邮件发送的内容EmailContent emailContent = initEmailContent();// 初始化<a href="http://www.tongtongxue.com/tags/%e9%82%ae%e4%bb%b6%e5%8f%91%e9%80%81%e5%99%a8" title="查看更多关于邮件发送器的文章" target="_blank">邮件发送器</a>EmailHelper emailHelper = new EmailHelper();emailHelper.sendMail(receiveAdds, emailConfigs, emailContent);emailHelper.shutdown();}private static List initEmailConfigs() {List emailConfigs = new ArrayList();EmailConfig emailConfig01 = new EmailConfig();emailConfig01.setUsername("xxxxx@163.com");emailConfig01.setPassword("xxxxx");emailConfig01.setServerPort("25");emailConfig01.setSmtpHost("smtp.163.com");emailConfig01.setSSL(false);emailConfigs.add(emailConfig01);EmailConfig emailConfig02 = new EmailConfig();emailConfig02.setUsername("xxxxx@yahoo.com");emailConfig02.setPassword("xxxxx");emailConfig02.setServerPort("465");emailConfig02.setSmtpHost("smtp.163.com");emailConfig02.setSSL(true);emailConfigs.add(emailConfig02);return emailConfigs;}private static List initReceiveAdds() {List receiveAdds = new ArrayList();receiveAdds.add("xxxxx@qq.com");receiveAdds.add("xxxxx@qq.com");receiveAdds.add("xxxxx@qq.com");return receiveAdds;}private static EmailContent initEmailContent() {EmailContent emailContent = new EmailContent();emailContent.setSubject("测试邮件邮件");emailContent.setContent("<title>Test</title><h1>这是一封测试邮件。。。欢迎来到通通学，http://www.tongtongxue.com</h1>");return emailContent;}
}

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