Java单元测试之邮件测试-GreenMail

比较流行的Java的SMTP开源组件有：

• Apache James Server http://james.apache.org/
• JES（Java Email Server） http://www.ericdaugherty.com/java/mailserver/
• SubEthaSMTP  http://code.google.com/p/subethasmtp/
• Dumbster http://quintanasoft.com/dumbster/
• GreenMail http://www.icegreen.com/greenmail/

其中 GreenMail 是最适合做单元测试的，它本身并不会发送邮件，但支持SMTP, POP3, IMAP。发布的时间也很长了，不过知道的人并不多。如果做发送邮件代码的单元测试，不想走邮件服务器，也不想mock的话，GreenMail 是个很好的选择。

引用

GreenMail is an embeddable, lightweight and sandboxed email server for testing and developing purposes

http://www.icegreen.com/greenmail/

目前版本：greenmail-1.3.1b.jar
Roadmap显示在1.4+版本中将会用 SubEthaSMTP 代替目前GreenMail自身的SMTP代码。

private static void testSMTPCode() throws Exception {
    GreenMail greenMail = new GreenMail();
    greenMail.start();
    
    // Sending
    GreenMailUtil.sendTextEmailTest("[e-mail]", "[e-mail]", "subject", "body");
    // Retrieving
    String msg = GreenMailUtil.getBody(greenMail.getReceivedMessages()[0]);
    System.out.println(msg);
    
    greenMail.stop();
}

private static void testSMTPSCode() throws Exception {
    GreenMail greenMail = new GreenMail();
    greenMail.start();
    
    // Sending
    GreenMailUtil.sendTextEmailSecureTest("[e-mail]", "[e-mail]", "subject", "body");
    // Retrieving
    String msg = GreenMailUtil.getBody(greenMail.getReceivedMessages()[0]);
    System.out.println(msg);
    
    greenMail.stop();
}

private static void testSpecialPort() throws Exception {
	ServerSetup ss = new ServerSetup(3025, null, "smtp");
	
	GreenMail greenMail = new GreenMail(ss);
	greenMail.start();
	GreenMailUtil.sendTextEmail("[e-mail]", "[e-mail]", "subject", "body", ss);

    greenMail.stop();
}