1：jar包
2：设置你自己的授权码，去你发件邮箱，设置授权码，不会的百度。
3： 代码
多种模式发送邮件，举个例子如下。
public static void main(String[] args) throws Exception{
// Create the email message
HtmlEmail email = new HtmlEmail();
email.setHostName("smtp.163.com");
email.setAuthentication("[email protected]","*************");
email.addTo("[email protected]", "Json");
email.setFrom("[email protected]", "json");
email.setSubject("Test email with inline image");
// embed the image and get the content id
URL url = new URL("http://www.apache.org/images/asf_logo_wide.gif");
String cid = email.embed(url, "Apache logo");
// set the html message
email.setHtmlMsg("<html>The apache logo - <img src=\"cid:"+cid+"\"></html>");
// set the alternative message
email.setTextMsg("Your email client does not support HTML messages");
// send the email
email.send();
}