javamail发送附件DataSource使用文件流解决过程

/*************1.本地文件*************/
// 将本地文件作为附件
DataSource dataSource = new FileDataSource("d:/测试文档.doc");

/*************2.网络文件*************/
// 将网络文件作为附件
URL url = new URL("www.test.com/file/ceshi.doc");
DataSource dataSource = new URLDataSource(url);

/*************3.文件流*************/
DataSource dataSource = new ByteArrayDataSource(inputStream, "application/octet-stream");

import java.io.InputStream;
import java.util.Date;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
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;
import javax.mail.util.ByteArrayDataSource;

public class MailService {

	/**
	 * 发送邮件
	 * @param session	连接james邮件获取
	 * @param inputStream	通过下载的方式获取文件流
	 * @param fileName	文件名称带后缀
	 */
	public void sendMail(Session session,InputStream inputStream,String fileName) {
		try {
			if(session == null){
				return;
			}
			// 创建一个MimeMessage 对象
			MimeMessage mimeMessage = new MimeMessage(session);
			// 指定发件人邮箱，包括姓名
			mimeMessage.setFrom(new InternetAddress("test@163.com", "测试人员", "UTF-8"));
			
			// 收件人地址
			Address[] to = InternetAddress.parse("to@163.com");
			// 指定收件人邮箱
			mimeMessage.addRecipients(Message.RecipientType.TO, to);
			
			//没有抄送人可以忽略
			Address[] cc = InternetAddress.parse("cc@163.com");
			// 指定抄送人邮箱
			mimeMessage.addRecipients(Message.RecipientType.CC, cc);
			
			// 指定邮件主题
			mimeMessage.setSubject("发送带附件的邮件");
			// 指定邮件发送日期
			mimeMessage.setSentDate(new Date());
			// 指定邮件优先级 1：紧急 3：普通 5：缓慢
			mimeMessage.setHeader("X-Priority", "3");
						
			MimeMultipart mimeMultipart = new MimeMultipart("mixed");
			mimeMessage.setContent(mimeMultipart);
			//内容
			MimeBodyPart bodyPart = new MimeBodyPart();
			mimeMultipart.addBodyPart(bodyPart);
			
				
			// 新建一个存放邮件附件的BodyPart对象
			BodyPart fileBodyPart = new MimeBodyPart();
			
			/*************1.本地文件*************/
			// 将本地文件作为附件
//			DataSource dataSource = new FileDataSource("d:/测试文档.doc");
			
			/*************2.网络文件*************/
			// 将网络文件作为附件
//			URL url = new URL("www.test.com/file/ceshi.doc");
//			DataSource dataSource = new URLDataSource(url);
			
			/*************3.文件流*************/
			DataSource dataSource = new ByteArrayDataSource(inputStream, "application/octet-stream");
			
			fileBodyPart.setDataHandler(new DataHandler(dataSource));
			// 处理邮件中附件文件名的中文问题
			String attachName = MimeUtility.encodeText(fileName);
			// 设定附件文件名
			fileBodyPart.setFileName(attachName);
			// 添加附件
			mimeMultipart.addBodyPart(fileBodyPart);	//发给外部邮箱需要添加附件
			
			//BODY(包括：图片，html)
			MimeMultipart bodyMultipart = new MimeMultipart("related");
			bodyPart.setContent(bodyMultipart);
			
			MimeBodyPart html = new MimeBodyPart();
			bodyMultipart.addBodyPart(html);
				
			//html
			html.setContent("测试发送带附件的邮件","text/html;charset=gbk");
			mimeMessage.saveChanges();
			
			// 发送邮件
			Transport.send(mimeMessage, mimeMessage.getAllRecipients());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}