java邮件开发--心得5-java编写复杂的电子邮件

1. 前面介绍了如何编写一个简单的电子邮件，这里再介绍一个编写复杂的电子邮件的案例，该电子邮件包括附件和html文本内容两部分；邮件主要内容和功能如下，下面请看具体案例和注释分析：

package com.csdn.itcast;import java.io.FileOutputStream;import java.io.OutputStream;import java.util.Properties;import javax.activation.DataHandler;import javax.activation.FileDataSource;import javax.mail.Address;import javax.mail.Message;import javax.mail.Session;import javax.mail.Message.RecipientType;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 Demo3 {/** * @param args * 复杂邮件的编写 */public static void main(String[] args) throws Exception{Message msg = new MimeMessage(Session.getInstance(new Properties()));/*这里用到了sun公司提供的编码工具类MimeUtility的encondeText()方法，来进行中文的编码；"\""是双引号的转义字符 * 邮件里的中文处理编码是以 =?  开头  ?= 结尾的base64编码的，中间要用两个问号隔开编码类型和中文编过码的内容; *比如： =?UTF-8?B?tKvWx7Klv80=?=  ;编译过来是”传智播客“的意思。 */msg.setFrom(new InternetAddress("\"" + MimeUtility.encodeText("杨凯专属频道") + "\" <itcast_test@sina.com>"));msg.setSubject("杨凯专属频道报道：黑马老师都很给力！");msg.setReplyTo(new Address[]{new InternetAddress("yang@163.com")});msg.setRecipients(RecipientType.TO,InternetAddress.parse(MimeUtility.encodeText("黎活明") + " <llm@itcast.cn>," + MimeUtility.encodeText("张孝祥") + " <zxx@itcast.cn>"));//最外面的即第一层框架，由附件和内容组成//这里传入的值是subtype即子类型mixed,不能是multipart/mixed;因为你new出的就是MimeMultipartMimeMultipart msgMultipart = new MimeMultipart("mixed");msg.setContent(msgMultipart);//attach1和attach2代表附件1和2，content代表内容MimeBodyPart attach1 = new MimeBodyPart();MimeBodyPart attach2 = new MimeBodyPart();MimeBodyPart content = new MimeBodyPart();msgMultipart.addBodyPart(attach1);msgMultipart.addBodyPart(attach2);msgMultipart.addBodyPart(content);//设置附件的值attach1.setDataHandler(new DataHandler(new FileDataSource("resource\\Java培训.txt")));attach1.setFileName(MimeUtility.encodeText("java培训.txt"));attach2.setDataHandler(new DataHandler(new FileDataSource("resource\\people.gif")));attach2.setFileName("people.gif");//设置内容的值，第二层框架，有html文本和gif图片组成MimeMultipart bodyMultipart = new MimeMultipart("related");//这里一定要注意，是设置内容content的内容而不是msg卫星的内容，否则会把上面设置的覆盖掉content.setContent(bodyMultipart);MimeBodyPart htmlPart = new MimeBodyPart();MimeBodyPart gifPart = new MimeBodyPart();bodyMultipart.addBodyPart(htmlPart);bodyMultipart.addBodyPart(gifPart);//设置图片的值gifPart.setDataHandler(new DataHandler(new FileDataSource("resource\\welcome.gif")));gifPart.setHeader("Content-Location", "http://www.itcast.cn/logo.gif");//设置html文本的值htmlPart.setContent("欢迎来到杨凯专属频道，这是我自己用程序生成和发送的邮件哦！<img src='resource\\welcome.gif'>","text/html;charset=UTF-8");msg.saveChanges();//此处不使用方法链的原因是：如果发送的邮件特别多，用一个for循环实现，那么如果不关闭资源的话会造成内存泄露OutputStream ops = new FileOutputStream("resource\\yk.eml");msg.writeTo(ops);ops.close();}}2. base64编码转换工具package cn.itcast.javamail2;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import sun.misc.BASE64Encoder;public class Base64Util {/** * @param args add by zxx ,Dec 30, 2008 * @throws IOException  */public static void main(String[] args) throws IOException {BASE64Encoder encoder = new BASE64Encoder();System.out.println("please input user name:");String username = new BufferedReader(new InputStreamReader(System.in)).readLine();System.out.println(encoder.encode(username.getBytes()));System.out.println("please input password:");String password = new BufferedReader(new InputStreamReader(System.in)).readLine();System.out.println(encoder.encode(password.getBytes()));}}