利用Tomcat的JNDI容器管理JavaMail中的Session

第一步:把javamail的jar包(mail.jar/jaf.jar(JDK5-):Java Activation Framework JavaMail中用它读取磁盘文件)拷贝到Tomcat\lib目录下...

第二步:在引用的META-INF目录下，建立一个context.xml的配置文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource name="mail/Session" auth="Container"
type="javax.mail.Session"
mail.smtp.host="smtp.163.com"/>
</Context>

  第三步：在web环境下通过JNDI获取JavaMail的Session

--------------------------------------------------------------------------------------------------------
案例一：发送文本和图片的邮件：

package com.leaf.eg04.mail;

import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
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;

public class MailDemo2 {

public static void main(String[] args) throws Exception{
Properties props = new Properties();//不设置任何配置,发送时需要
props.setProperty("mail.host","smtp.163.com");//设置发送主机所使用的发送协议
props.setProperty("mail.transport.protocol","smtp");//设置传输协议
Session session = Session.getInstance(props);//通过属性获取到Session的实例
session.setDebug(true);//Set the debug setting for this Session.
MimeMessage msg = new MimeMessage(session);//将session加入到模拟信息MimeMessage中,因为最终发送信息Trasport需要它
msg.setFrom(new InternetAddress("itheimacloud@163.com"));//AddressException,设置发件人邮箱
msg.setRecipients(Message.RecipientType.TO, "itheima14@163.com");//设置收件类型，收件地址
msg.setSubject("JavaMail发送的邮件");//设置收件的主题
//邮件内容的组装
//文本部分
MimeBodyPart textPart = new MimeBodyPart();
textPart.setContent("abc<img src='cid:abc'>abc","text/html");//设置文本内容和文本类型
//图片部分
MimeBodyPart imagePart = new MimeBodyPart();
//需要用到jaf的API
DataHandler dh = new DataHandler(new FileDataSource("src/1.jpg"));//将本地的图片内容加载到DataHandler中
imagePart.setDataHandler(dh);//将图片数据处理加载到MineBodyPart中
imagePart.setContentID("abc");//设置文本内容的id

//描述关系
MimeMultipart mm = new MimeMultipart();
mm.addBodyPart(textPart);//将文本内容添加到MimeMultipart中
mm.addBodyPart(imagePart);//将图片内容添加到MimeMultipart中
mm.setSubType("related");//默认子类型为mixed

msg.setContent(mm);//将组装好的邮件内容放到模拟信息中
msg.saveChanges();//保存信息
//msg.writeTo(new FileOutputStream("d:/"));//可以将组装好的邮件写到本地磁盘
//发送邮件
Transport ts = session.getTransport();
ts.connect("itheimacloud","iamsorry");//登录本地发送邮件客户端
ts.sendMessage(msg, msg.getAllRecipients());//向所有收件人发送信息(可以群发)
}
}

案例二:带有文本、图片和附件的邮件发送:

package com.leaf.eg04.mail;

import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
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;

public class MailDemo3 {

public static void main(String[] args) throws Exception{
Properties props = new Properties();
props.setProperty("mail.host","smtp.163.com");
props.setProperty("mail.transport.protocol","smtp");
props.setProperty("mail.smtp.auth", "true");//请求认证与java的实现有关
Session session = Session.getInstance(props);
session.setDebug(true);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("itheimacloud@163.com"));
msg.setRecipients(Message.RecipientType.TO, "itheima14@163.com");
//msg.setContent("<img src='src/1.jpg' id='abc'/>","text/html");
msg.setSubject("您好呀");
//msg.saveChanges();
//文本部分
MimeBodyPart textPart = new MimeBodyPart();
textPart.setContent("abc<img src='cid:abc'/>abc","text/html;charset=utf-8");
//图片部分
MimeBodyPart imagePart = new MimeBodyPart();
DataHandler dh = new DataHandler(new FileDataSource("src/1.jpg"));
imagePart.setDataHandler(dh);
imagePart.setContentID("abc");
//附件部分
MimeBodyPart attachmentPart = new MimeBodyPart();
//attachmentPart.attachFile("src/动态代理.txt");
DataHandler dh1 = new DataHandler(new FileDataSource("src/动态代理.txt"));
String name = dh1.getName();
System.out.println(name);//加上charset就不会有乱码
attachmentPart.setDataHandler(dh1);
attachmentPart.setFileName(MimeUtility.encodeText(name));//手动设置附件的名称

//描述关系
MimeMultipart mmPart = new MimeMultipart();
mmPart.addBodyPart(textPart);
mmPart.addBodyPart(imagePart);
mmPart.setSubType("related");

//文本和图片的组合再和附件进行组合
MimeBodyPart textImagePart = new MimeBodyPart();
textImagePart.setContent(mmPart);

MimeMultipart multipart = new MimeMultipart();//用户组合关系
multipart.addBodyPart(textImagePart);
multipart.addBodyPart(attachmentPart);
multipart.setSubType("mixed");//u复杂关系

msg.setContent(mmPart);
msg.saveChanges();
//Transport ts = new Transport(new FileDataSource("src/1.jpg"));
Transport ts = session.getTransport();
ts.connect("itheima@163.com","iamsorry");
ts.sendMessage(msg,msg.getAllRecipients());
}
}