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spring-bootthymeleaf

Difference of 3 xxx.setAttribute()

I'm New to SpringBoot,

I found 3 methods to send parameter from backend to frontend.

java code: https://paste.ubuntu.com/p/dtbBJVX3jQ/

HttpSession.setAttribute()

HttpServletRequest.getServletContext().setAttribute()

WebRequest.setAttribute()

Could you tell me what's the difference between 3 setAttribute() when in usage?

Thanks for your help

Solution
    • HttpSession is part of the Java EE API. It contains session scoped attributes. A session usually spans multiple requests, so whatever you save in a session attribute stays there until the session expires.
    • WebRequest is a Spring Web abstraction. It allows you to get and set attributes in different scopes (SCOPE_REQUEST, SCOPE_SESSION). A session-scoped attribute is the same as for HttpSession. A request-scoped attribute only lives for the duration of the request.
    • HttpServletRequest.getServletContext().setAttribute() is probably not what you need. ServletContext is created only once per web application, so you could only use it to save some global attributes that don't change for different requests.