How to implement page jump in java backend

There are two types of page jump categories: redirection and forwarding, namely redirect and forward.

1: Redirect redirect

The first way: the return value in the controller is String

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public String login(HttpServletRequest req, HttpServletResponse resp)
return "redirect:http://localhost:8080/index";

The second way: the return value in the controller is void

public void login(HttpServletRequest req, HttpServletResponse resp)
resp.sendRedirect("http://localhost:8080/index");

The third way: the return value in the controller is ModelAndView

return new ModelAndView("redirect:/toList");

2: Forward forward

For example:

request.getRequestDispatcher("/student_list.jsp").forward(request, response);

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