javamail的几个实用知识点

2008-02-23 10:06:41来源：互联网阅读 ()

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("lizongbo@gmail.com"));
msg.setRecipient(Message.RecipientType.TO,
new InternetAddress("lizongbo@msn.com"));
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：
--------------------------------------------------------------
Message-ID: <32591083.1110043294640.JavaMail.lizongbo@localhost>

From: lizongbo@gmail.com

To: lizongbo@msn.com

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("lizongbo@gmail.com"));
msg.setRecipient(Message.RecipientType.TO,
new InternetAddress("lizongbo@msn.com"));
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：

--------------------------------------------------------------
Message-ID: <33109165.1110043370875.JavaMail.lizongbo@localhost>

From: lizongbo@gmail.com

To: lizongbo@msn.com

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

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