Spring MVC Controller for Session Management: Set and Get Session Attributes

This is a Spring MVC controller class named 'HomeController' responsible for managing session data related to the '/home' path. It contains two methods, 'setSession' and 'getSession', both handling requests through GET and POST methods.

The 'setSession' method is used to store a key-value pair in the current session. It retrieves the key and value from the request parameters 'key' and 'value' respectively. The method obtains the current session using 'req.getSession()' and then stores the key-value pair using 'setAttribute'. It returns null after successful execution.

The 'getSession' method retrieves the value associated with a specific key from the current session. It extracts the key from the request parameter 'key'. The method uses 'getAttribute' to get the value associated with the provided key. If the key doesn't exist or its value is null, it returns null. Otherwise, it returns the value as a string.

Both methods use 'produces' attribute to define the content type as 'text/plain' with UTF-8 encoding. The 'ResponseBody' annotation indicates that the returned value should be directly returned to the client without rendering a view.