java 本地生成带附件的eml文件

有时候，我们需要把从数据库中查出来的资料，动态生成eml文件进行保存和发送，有的还需要嵌入附件，用什么方法来生成eml文件 如何本地生成邮件eml文件。

参考了JAVAMAIL通过IMAP协议保存的eml文件格式后，我们自己也可以本地构造eml文件。

还是看例子吧。

String mailbody = "";

mailbody = "Message-ID:"+uid+"\r\n";

mailbody = mailbody+"X-FreePOPs-User: "+user+"\r\n";

mailbody = mailbody+"X-FreePOPs-Domain: "+domain+"\r\n";

mailbody = mailbody+"Subject: "+sub+"\r\n";

mailbody = mailbody+"Date: "+sentDate+" \r\n";

mailbody = mailbody+"From: "+from+"\r\n";

mailbody = mailbody+"To: "+to+"\r\n" ;

mailbody = mailbody+"MIME-Version: 1.0\r\n";

BASE64Encoder encoder = new BASE64Encoder();

byte[] data = "body".getBytes();

try{

MessageDigest digest = MessageDigest.getInstance("MD5");

digest.update(((new Random()).nextInt() + "").getBytes());

data = digest.digest();// Get a romdom integer and get it's digest

}catch (Exception e) {

e.printStackTrace();

}

String mainBoundary = "****MAIN_BOUNDARY****" + byte2hex(data);

// Main boundary

String subBoundary = "****SUB_BOUNDARY****" + byte2hex(data);

mailbody += "Content-Type: multipart/mixed;\r\n" + "\tboundary=\"" + mainBoundary

+ "\"\r\n" + "\r\n" + "This is a multi-part message in MIME format.\r\n" + "\r\n"

// Above is mail's header

+ "--" + mainBoundary + "\r\n"

// The mail's text body

+ "Content-Type: multipart/alternative;\r\n" + "\tboundary=\"" + subBoundary + "\"\r\n" + "\r\n" + "--"

+ subBoundary + "\r\n";

mailbody += "Content-Type: text/html;\r\n";

mailbody += "\tcharset=\"utf-8\"\r\n" + "Content-Transfer-Encoding: 7bit\r\n" + "\r\n"

+ massage + "\r\n" + "\r\n" + "--" + subBoundary + "--\r\n"// End of sub boundary

+ "\r\n";

//

for (int i = 0; i < fjs.size(); i++) {

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