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软件工程.NET开发
javamail的几个实用知识点.

作者:未知 来源:月光软件站 加入时间:2005-5-13 月光软件站

1.把邮件保存为一个文件,这个文件可以直接用Outlook,Foxmail等邮件客户端工具打开。
 
 
    private void savemail(MimeMessage msg, String path) {
        try {
            File f = new File(path);
            f.getParentFile().mkdirs();
            FileOutputStream fo = new FileOutputStream(f);
//CRLFOutputStream 可以把一些换行符不满足MIME规范的邮件进行修正。
            CRLFOutputStream CRLFO = new CRLFOutputStream(fo);
            msg.writeTo(CRLFO);
            CRLFO.close();
            fo.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
 
调用:
 
savemail(msg,"c:/lizongbo/testmail.eml");
 
2.对邮件体使用base64编码。
 
默认情况下使用的是quoted-printable编码:
示例如下:
 
    MimeMessage msg = new MimeMessage((Session)null);
    msg.setFrom(new InternetAddress("[email protected]"));
    msg.setRecipient(Message.RecipientType.TO,
                     new InternetAddress("[email protected]"));
    msg.setText("测试一下,邮件来自 http://www.donews.net/lizongbo !!!");
    msg.setSubject("测试标题!!!", "GB2312");
    MimeMultipart multipart = new MimeMultipart();
    MimeBodyPart txtbodyPart = new MimeBodyPart();
    txtbodyPart.setText("这是一封html邮件,请用html方式察看!!!");
    multipart.addBodyPart(txtbodyPart);
    MimeBodyPart htmlodyPart = new MimeBodyPart();
    String content="html邮件内容!来自 http://www.donews.net/lizongbo ";
    content = "<html><body>" + content + "</body><html>";
    htmlodyPart.setContent(content, "text/html;charset=GBK");
    multipart.addBodyPart(htmlodyPart);
    msg.setContent(multipart);
    msg.saveChanges();
得到的邮件内容为:
--------------------------------------------------------------
 
 
 
Subject: =?GB2312?B?suLK1LHqzOKjoaOho6E=?=
 
Mime-Version: 1.0
 
Content-Type: multipart/mixed; boundary="----=_Part_0_8568863.1110043294484"
 
 
 
------=_Part_0_8568863.1110043294484
 
Content-Type: text/plain; charset=GBK
 
Content-Transfer-Encoding: base64
 
 
 
1eLKx9K7t+JodG1s08q8/qOsx+vTw2h0bWy3vcq9suy/tKOho6GjoQ==
 
------=_Part_0_8568863.1110043294484
 
Content-Type: text/html;charset=GBK
 
Content-Transfer-Encoding: quoted-printable
 
 
 
<html><body>html=D3=CA=BC=FE=A3=A1 http://www.donews.net/lizongbo </body><h=
 
tml>
 
------=_Part_0_8568863.1110043294484--
 
 
 
 
 
--------------------------------------------------------------
 
使用base64编码的代码:
--------------------------------------------------------------
    MimeMessage msg = new MimeMessage( (Session)null);
    msg.setFrom(new InternetAddress("[email protected]"));
    msg.setRecipient(Message.RecipientType.TO,
                     new InternetAddress("[email protected]"));
    msg.setText("测试一下,邮件来自 http://www.donews.net/lizongbo !!!");
    msg.setSubject("测试标题!!!", "GB2312");
    MimeMultipart multipart = new MimeMultipart();
    MimeBodyPart txtbodyPart = new MimeBodyPart();
    txtbodyPart.setText("这是一封html邮件,请用html方式察看!!!");
    multipart.addBodyPart(txtbodyPart);
    MimeBodyPart htmlodyPart = new MimeBodyPart();
    String content = "html邮件! http://www.donews.net/lizongbo ";
    content = "<html><body>" + content + "</body><html>";
    htmlodyPart.setContent(content, "text/html;charset=GBK");
    //最最关键的就这么一行
    htmlodyPart.setHeader("Content-Transfer-Encoding", "base64");
    multipart.addBodyPart(htmlodyPart);
    msg.setContent(multipart);
    msg.saveChanges();
 
得到邮件内容如下:
 
--------------------------------------------------------------
 
 
 
Subject: =?GB2312?B?suLK1LHqzOKjoaOho6E=?=
 
Mime-Version: 1.0
 
Content-Type: multipart/mixed; boundary="----=_Part_0_8568863.1110043370687"
 
 
 
------=_Part_0_8568863.1110043370687
 
Content-Type: text/plain; charset=GBK
 
Content-Transfer-Encoding: base64
 
 
 
1eLKx9K7t+JodG1s08q8/qOsx+vTw2h0bWy3vcq9suy/tKOho6GjoQ==
 
------=_Part_0_8568863.1110043370687
 
Content-Type: text/html;charset=GBK
 
Content-Transfer-Encoding: base64
 
 
 
PGh0bWw+PGJvZHk+aHRtbNPKvP6joSBodHRwOi8vd3d3LmRvbmV3cy5uZXQvbGl6b25nYm8gPC9i
 
b2R5PjxodG1sPg==
 
------=_Part_0_8568863.1110043370687--
 
3.启动javamail的调试模式,可以在发送和接收邮件的时候方便查看详细的调试信息,只需要:
 
    //Session session = Session.getInstance(System.getProperties());
    session.getProperties().setProperty("mail.debug","true");
    session.setDebug(true);
//默认的是输出调试信息到控制台
 
4.显式连接到需要验证的smtp服务器进行邮件发送。
一般的资料都说是自己继承javax.mail.Authenticator.
代码如下:
 
package com.lizongbo.javamail;
 
 
import javax.mail.*;
 
public class MailAuthenticator extends Authenticator {
    public MailAuthenticator() {
    }
 
    private String mUser;
    private String mPass;
 
    public MailAuthenticator(String userName, String passWord) {
        super();
        mUser = userName;
        mPass = passWord;
    }
 
    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(mUser, mPass);
    }
 
}

调用的示例:
 Session session = Session.getInstance(System.getProperties(),new MailAuthenticator ("lizongbo","password") );
    MimeMessage msg = new MimeMessage(session);
Transport.send(msg);
 
    其实也可以不继承这个class,而是直接使用用户名和密码连接到邮件服务器进行邮件发送操作。
    MimeMessage msg = new MimeMessage( (Session)null);
    msg.setFrom(new InternetAddress("[email protected]"));
    msg.setRecipient(Message.RecipientType.TO,
                     new InternetAddress("[email protected]"));
    //中间代码略去
    msg.saveChanges();
    Transport smtpTransport = session.getTransport("smtp");
    smtpTransport.connect("smtp.163.com", 25, "lizongbo", "password");
    //切忌不可以使用 smtpTransport.send(msg)和smtpTransport.send(msg,msg.getAllRecipients());
    //因为这两个是静态方法,无法获取与smtpTransport这个实例有关的参数.
    smtpTransport.sendMessage(msg, msg.getAllRecipients());
 
具体可以通过阅读javamail1.3.2的源代码来发现一些细节差异。
 



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