JavaMail邮件发送-将邮件保存到本地和发送一封本地邮件

一般是这样的，我们可能不会要求马上发送这封邮件，为了减少服务器压力和带宽压力，我们一般是在空闲时在发送，或者用户指定时间才发送

那么就要先把邮件进行保存，然后按时发送

可以将信息保存到数据库，然后获取后再组装邮件信息，这里我们就把邮件打成一个文件保存在本地

 

保存到本地很简单，只要之前你的示例都能跑通，只差一步

 

package com.mail;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.OutputStream;
 import java.util.Date;
 import java.util.Properties;
 import javax.mail.Message;
 import javax.mail.Session;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeMessage;
 import javax.mail.internet.MimeUtility;
 /**
 * @说明 保存一个邮件
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
 public class TextMail {
     public static void main(String[] args) throws Exception {
         Properties props = new Properties();
         props.put( "mail.smtp.host ", "smtp.163.com ");
         props.put("mail.smtp.port", 25);
         props.put("mail.smtp.auth", "true");
        Session session = Session.getInstance(props);
         session.setDebug(true);
         Message message = new MimeMessage(session);
         InternetAddress from = new InternetAddress("[email protected]");
         from.setPersonal(MimeUtility.encodeText("java小强<[email protected]>"));
        message.setFrom(from);
         InternetAddress to = new InternetAddress("[email protected]");
        message.setRecipient(Message.RecipientType.TO, to);
         message.setSubject(MimeUtility.encodeText("强哥邀请，谁敢不从！"));
         message.setText("强哥邀请你访问我的博客：http://cuisuqiang.iteye.com/！");
         message.setSentDate(new Date());
         // 邮件对象
         File file = new File("C:\\textmail.eml");
         // 获得输出流
         OutputStream ips = new FileOutputStream(file);
         // 把邮件内容写入到文件
        message.writeTo(ips);
         // 关闭流
        ips.close();
         System.out.println("发送完毕");
    }
}

package com.mail;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.Date;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
/**
 * @说明 保存一个邮件
 * @author cuisuqiang
 * @version 1.0
 * @since
 */
public class TextMail {
	public static void main(String[] args) throws Exception {
		Properties props = new Properties();
		props.put( "mail.smtp.host ", "smtp.163.com ");
		props.put("mail.smtp.port", 25);
		props.put("mail.smtp.auth", "true");
		Session session = Session.getInstance(props);
		session.setDebug(true);
		Message message = new MimeMessage(session);
		InternetAddress from = new InternetAddress("[email protected]");
		from.setPersonal(MimeUtility.encodeText("java小强<[email protected]>"));
		message.setFrom(from);
		InternetAddress to = new InternetAddress("[email protected]");
		message.setRecipient(Message.RecipientType.TO, to);
		message.setSubject(MimeUtility.encodeText("强哥邀请，谁敢不从！"));
		message.setText("强哥邀请你访问我的博客：http://cuisuqiang.iteye.com/！");
		message.setSentDate(new Date());
		// 邮件对象
		File file = new File("C:\\textmail.eml");
		// 获得输出流
		OutputStream ips = new FileOutputStream(file);
		// 把邮件内容写入到文件
		message.writeTo(ips);
		// 关闭流
		ips.close();		
		System.out.println("发送完毕");
	}
}

 

邮件对象创建后没有立即发送，而是保存到了一个文件中

 

那么如何发送一封已经存在的邮件呢？也很简单，只是邮件对象的创建的方式不一样了而已

 

package com.mail;
 import java.io.File;
 import java.io.FileInputStream;
 import java.util.Date;
 import java.util.Properties;
 import javax.mail.Message;
 import javax.mail.Session;
 import javax.mail.Transport;
 import javax.mail.internet.MimeMessage;
 /**
 * 放松一封现有邮件
 * @author [email protected]
 */
 public class SendCurrentMail {
     public static void main(String[] args) throws Exception {
         Properties props = new Properties();
         props.put("mail.smtp.auth", "true");
        Session session = Session.getInstance(props);
         // 现有邮件文件
         File file = new File("C:\\textmail.eml");
         FileInputStream fis = new FileInputStream(file);
         // 创建邮件对象
         Message message = new MimeMessage(session, fis);
         message.setSentDate(new Date());
        message.saveChanges();
         // 发送邮件
         Transport transport = session.getTransport("smtp");
         transport.connect("smtp.163.com", 25, "test20120711120200", "test123456");
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
        fis.close();
         System.out.println("发送完毕");
    }
}

package com.mail;
import java.io.File;
import java.io.FileInputStream;
import java.util.Date;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.MimeMessage;
/**
 * 放松一封现有邮件
 * @author [email protected]
 */
public class SendCurrentMail {
	public static void main(String[] args) throws Exception {
		Properties props = new Properties();
		props.put("mail.smtp.auth", "true");
		Session session = Session.getInstance(props);
		// 现有邮件文件
		File file = new File("C:\\textmail.eml");
		FileInputStream fis = new FileInputStream(file);
		// 创建邮件对象
		Message message = new MimeMessage(session, fis);
		message.setSentDate(new Date());		
		message.saveChanges();
		// 发送邮件
		Transport transport = session.getTransport("smtp");
		transport.connect("smtp.163.com", 25, "test20120711120200", "test123456");
		transport.sendMessage(message, message.getAllRecipients());
		transport.close();
		fis.close();
		System.out.println("发送完毕");
	}
}

 

当然，具体业务中的应用肯定要增加许多判断的，特别是设计到了文件的操作，我这里就不再一一的解说了！

 

最后：

由于近期大量小网站在未经同意情况下使用文章，现将我的博客地址公布如下，请您到ITEYE网站看原创，谢谢！

http://cuisuqiang.iteye.com/ ！