java后台实现发送邮件的功能

package test;

import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendEmail {
	 public static final String HOST = "smtp.163.com";
	    public static final String PROTOCOL = "smtp";   
	    public static final int PORT = 25;
	    public static final String FROM = "*****@163.com";//发件人的email
	    public static final String PWD = "*****";//发件人密码(授权密码)
	     
	    /**
	     * 获取Session
	     * @return
	     */
	    private static Session getSession() {
	        Properties props = new Properties();
	        props.put("mail.smtp.host", HOST);//设置服务器地址
	        props.put("mail.store.protocol" , PROTOCOL);//设置协议
	        props.put("mail.smtp.port", PORT);//设置端口
	        props.put("mail.smtp.auth" , "true");//身份认证
	         
	        Authenticator authenticator = new Authenticator() {
	 
	            @Override
	            protected PasswordAuthentication getPasswordAuthentication() {
	                return new PasswordAuthentication(FROM, PWD);
	            }
	             
	        };
	        Session session = Session.getDefaultInstance(props , authenticator);
	         
	        return session;
	    }

	    public static void send(String toEmail , String content) {
	        Session session = getSession();
	        try {
	            System.out.println("--send--"+content);
	            // Instantiate a message
	            Message msg = new MimeMessage(session);
	  
	            //Set message attributes
	            msg.setFrom(new InternetAddress(FROM));
	            InternetAddress[] address = {new InternetAddress(toEmail)};
	            msg.setRecipients(Message.RecipientType.TO, address);
	            msg.setSubject("账号激活邮件");
	            msg.setSentDate(new Date());
	            msg.setContent(content , "text/html;charset=utf-8");
	  
	            //Send the message
	            Transport.send(msg);
	        }
	        catch (MessagingException mex) {
	            mex.printStackTrace();
	        }
	    }
	    
}