java mail(SSL)

public class MailAction extends BaseAction {
    private String smtphost = Constants.MAIL_SERVER_IP; // 发送邮件服务器IP
    private int port = Constants.MAIL_SERVER_PORT;  // 发送邮件服务器端口
    private String user1 = Constants.MAIL_SERVER_USER; // 邮件服务器登录用户名
    private String password = Constants.MAIL_SERVER_PASSWORD; // 邮件服务器登录密码
    private String from = Constants.MAIL_SENDPASSWROD_SENDER_ADDRESS; // 发送人邮件地址
    private String subject = "基础密钥修改通知!"; // 邮件标题

    public String sendMail(String to, String body) {
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
        final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        Properties props = new Properties();
        props.put("mail.smtp.host", smtphost);
        props.put("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.put("mail.smtp.socketFactory.fallback", "false");
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.socketFactory.port", port);
        props.put(