具体请看commons-email项目主页：

需要的jar包

commons-email.jar：

mail.jar:http://download.oracle.com/otn-pub/java/javamail/1.4.5/javamail1_4_5.zip

commons-email.jar 是简化java原生email API开发的工具包，所以需要mail.jar:

导入上面2个jar后，简单的测试：

package test;import org.apache.commons.mail.DefaultAuthenticator;import org.apache.commons.mail.Email;import org.apache.commons.mail.EmailException;import org.apache.commons.mail.SimpleEmail;public class Main {	public static void main(String[] args) throws EmailException {		Email email = new SimpleEmail();		email.setHostName("smtp.gmail.com");		email.setSmtpPort(587);		email.setAuthenticator(new DefaultAuthenticator("username", "password"));		email.setTLS(true);		email.setFrom("username@gmail.com");		email.setSubject("TestMail");		email.setMsg("This is a test mail ... :-)");		email.addTo("test@host.com");		email.send();	}}