练习javamail写了一个发送邮件的程序,邮件标题采取以下设置可以正确显示中文:
=====
sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder(); msg.setSubject("=?GB2312?B?"+enc.encode(subject.getBytes())+"?=");
=====
但是正文部分采取以下代码却显示中文为乱码:
=====
msg.setText("中文测试", "GB2312");
msg.setHeader("Content-Transfer-Encoding", "Base64");
-----
奇怪的是信头似乎是正确的:
Received: from zju-mchen (unknown [222.205.83.8])by smtp14 (Coremail) with SMTP id wKjRD7D7ogbEf3ZG26ztAQ==.44476S2;
Mon, 18 Jun 2007 20:51:19 +0800 (CST)
From: [email protected]
To: [email protected]
Message-ID: <9031454.11182225057828.JavaMail.jerryshao@zju-mchen>
Subject: =?GB2312?B?QklPT08gwLTQxQ==?=
MIME-Version: 1.0
Content-Type: text/plain; charset=GB2312
Content-Transfer-Encoding: Base64
X-Coremail-Antispam: 1U3Yxn0WfASr-VFAUDIcSsGvfJTRUUUjkAFxVCF77xC6IxKo4
kEV4ylIxAIcVC2z280aVAFwI0_Gr0_Cr1lw4CEc2x0rVAKj4xxM4xvF2IEb7IF0Fy264kE
64k0F24lnxkEFVAIw20F6cxK64vIFxWl6VACY4xI67k04243AwC2zVAF1VAY17CE14v26r
1j6r15Mx02cVAKzwACY4xI67k04243AVC20s07MIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_
Gr1UMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4l4x8a6c8ajcxJMcIj6xIIjxv20xvE14v26r
1Y6r17MIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwAv7VC2z280aVAFwI0_Jr0_Gr1l
1I0EscIYIxCEI4klw4CSwwCY02Avz4vE14v_Xr1lc2IjII80xcxEwVAKI48JM7AC8VAFwI
0_Jr0_Gr1lb4IE77IF4wAFIxvE14AKwVWUJVWUGwAqx4xG64xvF2IEw4CE5I8CrVC2j2Wl
c7Ca8VAvwVA2a4k0FcxrM7k0a2IF6F4Un29KB7ZKAUJUUUUUnxnvy29KBjDU0xZFpf9x07
brxhLUUUUU129KBjDU=
Date: Mon, 18 Jun 2007 20:51:21 +0800 (CST)dGVzdCA/Pw====================
测试过,英文邮件完全可以正常显示,想来想去似乎应该是编码问题,但是……百思不得其解谢谢大家帮忙。
=====
sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder(); msg.setSubject("=?GB2312?B?"+enc.encode(subject.getBytes())+"?=");
=====
但是正文部分采取以下代码却显示中文为乱码:
=====
msg.setText("中文测试", "GB2312");
msg.setHeader("Content-Transfer-Encoding", "Base64");
-----
奇怪的是信头似乎是正确的:
Received: from zju-mchen (unknown [222.205.83.8])by smtp14 (Coremail) with SMTP id wKjRD7D7ogbEf3ZG26ztAQ==.44476S2;
Mon, 18 Jun 2007 20:51:19 +0800 (CST)
From: [email protected]
To: [email protected]
Message-ID: <9031454.11182225057828.JavaMail.jerryshao@zju-mchen>
Subject: =?GB2312?B?QklPT08gwLTQxQ==?=
MIME-Version: 1.0
Content-Type: text/plain; charset=GB2312
Content-Transfer-Encoding: Base64
X-Coremail-Antispam: 1U3Yxn0WfASr-VFAUDIcSsGvfJTRUUUjkAFxVCF77xC6IxKo4
kEV4ylIxAIcVC2z280aVAFwI0_Gr0_Cr1lw4CEc2x0rVAKj4xxM4xvF2IEb7IF0Fy264kE
64k0F24lnxkEFVAIw20F6cxK64vIFxWl6VACY4xI67k04243AwC2zVAF1VAY17CE14v26r
1j6r15Mx02cVAKzwACY4xI67k04243AVC20s07MIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_
Gr1UMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4l4x8a6c8ajcxJMcIj6xIIjxv20xvE14v26r
1Y6r17MIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwAv7VC2z280aVAFwI0_Jr0_Gr1l
1I0EscIYIxCEI4klw4CSwwCY02Avz4vE14v_Xr1lc2IjII80xcxEwVAKI48JM7AC8VAFwI
0_Jr0_Gr1lb4IE77IF4wAFIxvE14AKwVWUJVWUGwAqx4xG64xvF2IEw4CE5I8CrVC2j2Wl
c7Ca8VAvwVA2a4k0FcxrM7k0a2IF6F4Un29KB7ZKAUJUUUUUnxnvy29KBjDU0xZFpf9x07
brxhLUUUUU129KBjDU=
Date: Mon, 18 Jun 2007 20:51:21 +0800 (CST)dGVzdCA/Pw====================
测试过,英文邮件完全可以正常显示,想来想去似乎应该是编码问题,但是……百思不得其解谢谢大家帮忙。
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msg.setText(content, encoding);
msg.setHeader("Content-Type", "text/plain; charset=" + encoding);
msg.setHeader("Content-Transfer-Encoding", "Base64");
用到这样的case也是有可能的。其实mail的编码非常复杂。
lz可以尝试用utf8,看看如何。
body = new String(body.getBytes("iso-8859-1"),"gb2312");
msg.setContent(body, "text/plain;charset=gb2312");其他代码没有变,将一楼关于正文的代码(也就是有问题的代码)换成以上两行,中文可以正常显示是否因为一开始需要将字符串的编码机制改为gb2312,然后再将message中的编码机制声明为gb2312?p.s. 问题点数20 是否需要手动加给网友(我是新手^_^)
使用javamail发送html邮件比较复杂package org.tatan.mail;import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import javax.mail.Session;
import javax.mail.MessagingException;
import javax.mail.Transport;public class SendHtmlMail {
public static void sendMessage(String smtpHost,
String from, String to,
String subject, String messageText)
throws MessagingException,java.io.UnsupportedEncodingException { // Step 1: Configure the mail session
System.out.println("Configuring mail session for: " + smtpHost);
java.util.Properties props = new java.util.Properties();
props.setProperty("mail.smtp.auth", "true");//指定是否需要SMTP验证
props.setProperty("mail.smtp.host", smtpHost);//指定SMTP服务器
props.put("mail.transport.protocol", "smtp");
Session mailSession = Session.getDefaultInstance(props);
mailSession.setDebug(true);//是否在控制台显示debug信息 // Step 2: Construct the message
System.out.println("Constructing message - from=" + from + " to=" + to);
InternetAddress fromAddress = new InternetAddress(from);
InternetAddress toAddress = new InternetAddress(to); MimeMessage testMessage = new MimeMessage(mailSession);
testMessage.setFrom(fromAddress);
testMessage.addRecipient(javax.mail.Message.RecipientType.TO, toAddress);
testMessage.setSentDate(new java.util.Date());
testMessage.setSubject(MimeUtility.encodeText(subject,"gb2312","B")); testMessage.setContent(messageText, "text/html;charset=gb2312");
System.out.println("Message constructed"); // Step 3: Now send the message
Transport transport = mailSession.getTransport("smtp");
transport.connect(smtpHost, "webmaster", "password");
transport.sendMessage(testMessage, testMessage.getAllRecipients());
transport.close();
System.out.println("Message sent!");
} public static void main(String[] args) { String smtpHost = "localhost";
String from = "[email protected]";
String to = "[email protected]";
String subject = "html邮件测试"; //subject javamail自动转码 StringBuffer theMessage = new StringBuffer();
theMessage.append("<h2><font color=red>这倒霉孩子</font></h2>");
theMessage.append("<hr>");
theMessage.append("<i>年年失望年年望</i>"); try {
SendHtmlMail.sendMessage(smtpHost, from, to, subject, theMessage.toString());
}
catch (javax.mail.MessagingException exc) {
exc.printStackTrace();
}
catch (java.io.UnsupportedEncodingException exc) {
exc.printStackTrace();
}
}
}
邮件头(参见RFC822,RFC2047)只能包含US-ASCII字符。
邮件头中任何包含非US-ASCII字符的部分必须进行编码,使其只包含US-ASCII字符。
但是java mail可以根据JVM发送中文邮件自行编码,,用它自带的MimeUtility类的encodeText方法对中文信息进行编码也可以。
邮件正文必须有charset=gb2312否则为
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
打开邮件为乱码,设置charset=gb2312后
Content-Type: text/html;charset=gb2312
Content-Transfer-Encoding: quoted-printable
它不能用MimeUtility里的方法来编码。
邮件正文的编码方式的信息是要放在Content-Transfer-Encoding这个邮件头参数中的,
而MimeUtility里面的方法是将编码方式的信息放在编码后的正文内容中。
所以如果你对正文也用MimeUtility进行处理,那么其他邮件程序就不会正常显示你编码的邮件,
因为其他邮件软件如outlook,foxmail只会根据Content-Transfer-Encoding这个里面的信息来对邮件正文进行解码。