數據返回（數據共享，即從后端返回到前端調用，四種（requesst、ModelAndView、Model、Map））

@Controller
@RequestMapping("/view")//請求父路徑
public class GoodsController {

		@RequestMapping("/goodsReturnReq.do")//請求子路徑
		public String goodsReturnReq(Goods goods,HttpServletRequest request){
			System.out.println("goodsReturnReq:"+goods);
			request.setAttribute("gds",goods);
			//MySpringMVC02/view/goodsAddOk.jsp  注意：404錯誤一般都是路徑寫錯了，須仔細檢查哪里拼寫錯了
			//MySpringMVC02/view/goodsAddOK.jsp  這里K一個大寫一個小寫
			return "goodsAddOK";//請求成功的返回路徑
		}
		
		@RequestMapping("/goodsReturnMav.do")
		public ModelAndView goodsReturnMav(Goods goods){
			System.out.println("goodsReturnMav:"+goods);
			ModelAndView mav = new ModelAndView("goodsAddOK");//請求成功的返回路徑
			mav.addObject("gds",goods);
			return mav;//返回模型視圖
		}
		
		@RequestMapping("goodsReturnModel.do")
		public String goodsReturnModel(Goods goods,Model model){
			System.out.println("goodsReturnModel:"+goods);
			model.addAttribute("gds",goods);//此處是add不是set
			return "goodsAddOK";
		}
		
		@RequestMapping("goodsReturnMap")
		public String goodsReturnMap(Goods goods,Map map){
			System.out.println("goodsReturnMap:"+goods);
			map.put("gds", goods);//Map
			return "goodsAddOK";
		}
}