发送HTML类型的电子邮件:
1.在前端输入页面要在上个的基础上加入对邮件类型的判断
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    
<head>
        
<title>JavaMail2.html</title>
    
</head>

    
<body>

        
<form action="SEND2" method="post">
             From:
<input type="text" name="from"><br>
             TO:
<input type="text" name="to"><br>
             Subject:
<input type="text" name="subject"><br>
             type:
<select name="type" size="1">
                    
<option value="text/plain">Text</option>
                    
<option value="text/html">Html</option>
                 
</select><br>
             Context:
<textarea rows="3" cols="40" name="context"></textarea><br>
            
<input type="submit" value="send">
        
</form>
    
</body>
</html>
2.编写servlet : SEND2.java
package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Properties;

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.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SEND2 extends HttpServlet ...{

    
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException ...{

         response.setContentType(
"text/html");
         PrintWriter out
= response.getWriter();
         request.setCharacterEncoding(
"gb2312");
        
         String from
= request.getParameter("from");
         String to
= request.getParameter("to");
         String subject
= request.getParameter("subject");
         String context
= request.getParameter("context");
         String type
=request.getParameter("type");
        
        
// 确定要发送的邮件服务器的地址
         String mailserver = "codedestiny-pc";
        
        
try ...{
            
// 设置邮件的传输协议
             Properties prop = System.getProperties();
             prop.put(
"mail.smtp.host", mailserver);
            
            
// 建立邮件发送的连接
             Session session = Session.getDefaultInstance(prop, null);
            
            
// 创建发送的信息的载体
             Message msg = new MimeMessage(session);
            
            
// 设置相关的邮件属性
             msg.setFrom(new InternetAddress(from));
            
            
// 点到点的发送
             msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
            
            
/**//*
              * 群发 msg.setRecipients(Message.RecipientType.TO, new
              * InternetAddress[]{new InternetAddress(to),new
              * InternetAddress(to)}); //借助循环的标准发送
             
*/

             msg.setSubject(subject);
             msg.setSentDate(
new Date());
            
            
//判断发送的Mime类型
             Multipart mp = new MimeMultipart();
             MimeBodyPart mbp
= new MimeBodyPart();
            
            
//设置邮件发送数据的类型
             mbp.setContent(context, type+";charset=GB18030");
            
            
//text/plain或text/html;charset=GB18030,将发送的数据进行封装
             mp.addBodyPart(mbp);
             msg.setContent(mp);
            
            
// 发送
             Transport.send(msg);
         }
catch (Exception e) ...{
             e.printStackTrace();
         }


         out.print(
"send ok");
         out.flush();
         out.close();
     }



}