I show email on my website as following
<a href="mailto:[email protected]">Email</a>
But I read the following while analysing my website using woorank.com, what should I do to avoid this?
Malicious bots scrape the web in search of email addresses and plain text email addresses are more likely to be spammed.
There are multiple different choices for hiding emails on websites, commonly using either the HTML entity version of the email address (as Aziz-Saleh suggested), but from an actual web design point of view, just putting the email address like that on a website isn't the most user friendly thing to do.
For instance, the mailto: link automatically triggers the browser to open the user's Email Application of choice - but consider this. Not everybody has a dedicated email application. For instance, I don't use Outlook (I'm a Windows user), and unless I have Windows Live Mail installed, my computer can't open that link. I think Chrome can open the links into GMail if you're signed in, but I would need to check that.
Ultimately, by using mailto:, you are potentially alienating a portion of your userbase that will not be able to use that link in the first place.
I would suggest using email forms, and there are plenty of easy-to-follow tutorials available for both PHP and your language of JSP, such as this link here: Sending Email in JSP and even on StackOverflow
By using your server to send the email, you get tighter control over how the email is generated, what data the user is allowed to put in, and you could even send them a return email (generated by the server) to confirm that you have received their message. This is a tried-and-tested real-world method of allowing customers and visitors to contact you, whilst still giving you protection and control over the entire process.
TL;DR: Raw mailto: links might alienate people without dedicated email programs, whereas if you use JSP forms, you can control how they contact you, with what information (you can use fields and the HTML5 required attribute to mandate certain input fields) and you can even respond with a do-not-reply email so they know their message was heard (just don't forget to ask for their email address)