What is the difference between doView() and render() functions in Liferay?

liferay, portlet

Solution

`doView()` = to handle render requests when in VIEW mode.

`render()` = This method invokes the `doDispath()` method and sets the title of the portlet by using `getTitle()` method. Then it invokes one of `doView()`, `doEdit()`, `doHelp()`, etc. depending of the portlet mode specified in the `RenderRequest`.

Again, RenderRequest is when you want to handle requests in the VIEW mode of the portlet. If your portlet uses additional resources to render the view (i.e. images, JavaScript files, etc.) then the JSP that renders the view will use `<portlet:resourceURL />` tags to generate valid URLs to those resources. Those URLs will be processed with a pair of `ResourceRequest` and `ResourceResponse` objects.

You can override the resource phase though but bear in mind that when you use `ResourceRequest`/`ResourceResponse` to serve, the portlet can't change the current portlet mode, window state or render parameters. And also the parameters set on the resource urls are not the render parameters and they are valid to serve only that current resource request.

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