java - Spring MVC - session 差异

Question

通过HttpServletRequest.getSession()获取session和在controller方法中注入(inject)HttpSession有区别吗？

Answer 1

注入(inject) Spring MVC Controller 的 session 对象基本上没有区别:

@RequestMapping(value = "/somepath", method = RequestMethod.POST)
@ResponseBody
public JsonResponse someMethod (HttpSession session)
{
 // play with session attributes
}

以及从 HttpServletRequest 中检索到的 session 对象:

@RequestMapping(value = "/somepath", method = RequestMethod.POST)
@ResponseBody
public JsonResponse someMethod (HttpServletRequest request)
{
  Session session = request.getSession();
  // You are playin with the same session attributes.
}

前一种风格只是为您提供一种获取上下文 HttpSession 对象的工具，方法是将它作为 Controller 参数注入(inject)，以便 Spring 处理所有脏东西给你。