Java send mail using gmail and support utf-8 characters

Step 1. Download the jar
Download the jar of javax.mail.jar from oracle send mail , and I used the JavaMail 1.5.0 version of 


Step 2. Example Using connecttion to gmail
 please notice the red color character.
// ---------------
public void test_gmail2 () throws Exception {
      
            final String SMTP_HOST_NAME = "smtp.gmail.com";
            final String SMTP_HOST_PORT = "465";
            final String SMTP_AUTH_USER = "your_Gmail@gmail.com";
            final String SMTP_AUTH_PWD = "your_Gmail_Password";

            Properties props = new Properties();

            props.put("mail.transport.protocol", "smtps");
            props.put("mail.smtps.host", "smtp.gmail.com");
            props.put("mail.smtps.auth", "true");
            props.put("mail.smtp.starttls.enable","true");
            props.put("mail.smtp.socketFactory.port", SMTP_HOST_PORT);
            props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            props.put("mail.smtp.socketFactory.fallback", "false");
                  
            Session mailSession = Session.getInstance(props,  new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(SMTP_AUTH_USER, SMTP_AUTH_PWD);
                }
              });
            mailSession.setDebug(true);
            Transport transport = mailSession.getTransport("smtps");

            MimeMessage message = new MimeMessage(mailSession);
             message.setSubject("這是Testing SMTP-SSL");
            message.setContent("<h3>This</h3> is a test 信", "text/html;charset=utf-8");
          
         
            message.addRecipient(Message.RecipientType.TO, new InternetAddress("Sender_mail"));

          
            /**/
            transport.connect
              (SMTP_HOST_NAME, Integer.parseInt(SMTP_HOST_PORT), SMTP_AUTH_USER, SMTP_AUTH_PWD);

            transport.sendMessage(message,
                message.getRecipients(Message.RecipientType.TO));
            transport.close();
 }
    

Linux remove code previous number

we use the sed to replace the number is code
the first character can be space one number, the two number may a number

sed 's/^[ 0-9]*[0-9]//g' code.java





Reference
Sed RE pattern

Jquery can't change image refresh in Firefox and IE

1. Problem:
 Some times we try dynamic to change a picture in html,
and we assume this image is same,
in firefox and IE, this doesn't work,
and we happen is in captcha image.


2. Solution
This is because the firefox and ie seem the picture name is same, so they didn't send the request.  solution is add a random number in the request.
// HTML
<a href="" id="captcha_img_link"  title="Change img">chane</a>
<img id="captcha_img" align="middle" src="jcaptcha.jpg"  />


// Javascript
$(function (){
    // change image
    $('#captcha_img_link').click(function () {
        // Avoid the cache using appach random
        $("#captcha_img").attr('src',"./jcaptcha.jpg?random=" + Math.floor((Math.random()*20)+1));               
        return false;
    });
});




Reference:
How to force a web browser NOT to cache images