After generating a new password, how to send it to user Mail Id?

<%Random r = new Random();   
StringBuilder sb = new StringBuilder();   
for (int i = 0; i < 8; ++i) {   
	char temp = (char) ('a' + r.nextInt('Z'- 'A'));
    sb.append(temp);
}  
String output = sb.toString();
out.println(sb.toString()); %>

UserName* <input type="text" name="Name" value="" />
<input type="button" value="Proceed"  önclick="parent.location='mailto:abc@gmail.com';" />
<input type="submit" value="Reset">