springmvc怎么跳转页面

在spring mvc中实现在Controller中进行页面跳转有两种方式

1.Java代码

public ModelAndView login(HttpServletResponse response, String id) {
response.sendRedirect("index.do="+id);
return null;
}

public ModelAndView login(HttpServletResponse response, String id) {
response.sendRedirect("index.do="+id);
return null;
}

2.Java代码
public ModelAndView login(HttpServletResponse response, String id) {

return new ModelAndView("redirect:index.do="+id);
}

public ModelAndView login(HttpServletResponse response, String id) {

return new ModelAndView("redirect:index.do="+id);
}

return new ModelAndView("redirect:" + downloadUrl);