@RequestMapping(value="/redir/authcode")    public ModelAndView getAuthCode(){        String authUrl="https://openauth.alipay.com/oauth2/publicAppAuthorize.htm?app_id="+contant.APPID+"&scope=auth_user&redirect_uri="+contant.ENCODED_URL+"";        return new ModelAndView(new RedirectView(authUrl));    }//重定向到外网地址

 

@Controller@RequestMapping("/redir")public class RedirController {        @ResponseBody    @RequestMapping(value="pay")    public String redirect(){        return "redirect:/pay.html";    }}//这种方法无法跳转

 

@Controller@RequestMapping("/redir")public class RedirController {        @ResponseBody    @RequestMapping(value="pay")    public ModelAndView redirect(){                return new ModelAndView("redirect:/pay.html");    }}//正确方法

 

@Controllerpublic class RedirController {    @RequestMapping(value="/redir/pay")    public String redirect(){        return "redirect:/pay.html";    }}//正确跳转方式