重定向的那些事

一、RequestDispatcher.forward

二、HttpServletResponse.sendRedirect

三、

@RequestMapping("redirectByStr")
public String redirectByStr() {
    return "redirect:http://XXX";
}

@RequestMapping("redirectView")
public ModelAndView redirectView(HttpServletRequest req, HttpServletResponse resp) {
      
    String url = "redirect:http://XXX";
    return new ModelAndView(url);
}

只要处于请求阶段，都可以用这个跳转

((ServletRequestAttributes)RequestContextHolder
    .getRequestAttributes())
    .getResponse ()
    .sendRedirect ("http://XXX");
return null;