通过commons-email发送邮件
首先，去http://commons.apache.org/email/把commons-email-1.2-bin.zip下载下来，然后把其中的commons-email-1.2.jar包导入项目中。
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commons-email-1.2.jar很小，只有32k，也就是9个类而已，却能省不少事。
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commons-email-1.2.jar提供了如下9个类：ByteArrayDataSource、DefaultAuthenticator、Email、EmailAttachment、EmailException、EmailUtils、HtmlEmail、MultiPartEmail、SimpleEmail。
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在http://commons.apache.org/email/userguide.html有commons-email的使用示例。
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1、SimpleEmail
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import org.apache.commons.mail.EmailException;import org.apache.commons.mail.SimpleEmail;public class MailTo {public static void main(String[] args) {try {//发送简单邮件SimpleEmail email = new SimpleEmail();email.setHostName("smtp.sina.com");//需要邮件发送服务器的用户名、密码验证 email.setAuthentication("jsntghf@sina.com", "XXX");email.addTo("jsntghf@gmail.com", "Eric");email.setFrom("jsntghf@sina.com", "Michael");email.setCharset("UTF-8");email.setSubject("测试邮件");email.setMsg("这是一封测试邮件");email.send();} catch (EmailException e) {e.printStackTrace();}}}??2、HtmlEmail
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import java.net.MalformedURLException;import java.net.URL;import org.apache.commons.mail.EmailException;import org.apache.commons.mail.HtmlEmail;public class MailTo {public static void main(String[] args) {try {HtmlEmail email = new HtmlEmail();email.setHostName("smtp.sina.com");email.setAuthentication("jsntghf@sina.com", "XXX");email.addTo("jsntghf@gmail.com", "Eric");email.setFrom("jsntghf@sina.com", "Michael");email.setCharset("UTF-8");email.setSubject("测试邮件");URL url = new URL("http://www.apache.org/images/asf_logo_wide.gif");String cid = email.embed(url, "Apache logo");email.setHtmlMsg("<html>The apache logo - <img src="cid:" + cid+ ""></html>");email.setTextMsg("Your email client does not support HTML messages");email.send();} catch (EmailException e) {e.printStackTrace();} catch (MalformedURLException e) {e.printStackTrace();}}}?
3、EmailAttachment
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import java.net.MalformedURLException;import java.net.URL;import org.apache.commons.mail.EmailAttachment;import org.apache.commons.mail.EmailException;import org.apache.commons.mail.MultiPartEmail;public class MailTo {public static void main(String[] args) {try {// Create the attachmentEmailAttachment attachment = new EmailAttachment();attachment.setURL(new URL("http://www.apache.org/images/asf_logo_wide.gif"));attachment.setDisposition(EmailAttachment.ATTACHMENT);attachment.setDescription("Apache logo");attachment.setName("Apache logo");// Create the email messageMultiPartEmail email = new MultiPartEmail();email.setHostName("smtp.sina.com");email.setAuthentication("jsntghf@sina.com", "XXX");email.addTo("jsntghf@gmail.com", "Eric");email.setFrom("jsntghf@sina.com", "Michael");email.setCharset("UTF-8");email.setSubject("测试邮件");email.setMsg("这是一封测试邮件");// add the attachmentemail.attach(attachment);email.send();} catch (MalformedURLException e) {e.printStackTrace();} catch (EmailException e) {e.printStackTrace();}}}