@RequestMapping(value?=?"/{seckillId}/detail",method?=?RequestMethod.GET)
public?String?detail(@PathVariable("seckillId")?Long?seckillId,?Model?model){
????//如果傳入seckillId為空
????if(seckillId==null){
????????
????????return?"redirect:/seckill/list";
????}
????Seckill?seckill?=?seckillService.getById(seckillId);
????//如果沒有查到對應seckillId的seckill
????if(seckill==null){
????????//地址欄發生變化
????????//?但是Url為：http://localhost:8080/seckill/seckill/list
????????//而不是：http://localhost:8080/seckill/list
????????return?"redirect:/seckill/list";
????????//url地址欄不發生變化
????????//return?"forward:/seckill/list";
????}

不是說重定向的話“/”表示項目根目錄嗎，為什么這個重定向以后，/表示項目根目錄呢