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Figure out the URL and the port of the Tomcat server

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Problem

In Liferay I have some tabs. In a portlet I want to add a link which would send the user to another tab. Here I should use a full URL like http://localhost:8081/web/guest/tab2. It's OK on my machine but if I put it on a server, the address and port will change. Thus, the string localhost:8081 shouldn't be hardcoded. How to figure it out dynamically?

Solution

Use the renderRequest object which is available in your JSPs:

• http://portals.apache.org/pluto/portlet-api/apidocs/javax/portlet/RenderRequest.html
• methods are explained in its superinterface: http://portals.apache.org/pluto/portlet-api/apidocs/javax/portlet/PortletRequest.html

Example:

/**
* Ex.: http://localhost:8081
*/
public final static String getLiferayUrl(RenderRequest request) {
    return "http://" + request.getServerName() + ":" + request.getServerPort();
}