Enable https:// on tomcat in two steps.

With this tutorial, I will explain, how to enable SSL (Secure Socket Layer) on tomcat 7 in tow steps.
Step 01: Create .keystore file.

Run the following command to generate .keystore file from $JAVA_HOME/bin.

On windows :

%JAVA_HOME%\bin\keytool -genkey -alias tomcat -keyalg RSA 

On linux:

$JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA  

Step 02: Uncomment "SSL HTTP/1.1 Connector on port 8443" on $CATALINA_HOME/conf/server.xml and modify it as follows.

<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
              maxThreads="150" scheme="https" secure="true"
              clientAuth="false" sslProtocol="TLS" 
              keystoreFile="${user.home}/.keystore" keystorePass="123@com"/>

The "keystorePass" is the password which you provided when generating .keystore file. Now restart the tomcat.

By default port 8443 keeps listening https requests. Open a browser and check the following URL.

https://localhost:8443

If you see tomcat's home page, you are done.