/**
 * 向頁面回傳數據顯示 handle01/02/03
 * 使用 model map modelMap 回傳數據 放置在request中
 */
@RequestMapping("/handle01")
public String handler01(Map<String, String> map) {
    map.put("msg","你好1！");
    return "success";
}

@RequestMapping("/handle02")
public String handler02(Model model) {
    model.addAttribute("msg","你好2");
    return "success";
}

@RequestMapping("/handle03")
public String handler03(ModelMap modelMap) {
    modelMap.addAttribute("msg","你好3");
    return "success";
}

/**
 * modelAndView 攜帶數據
 */

@RequestMapping("/handle04")
public ModelAndView handler(){
    ModelAndView mv = new ModelAndView("success");
    mv.addObject("msg","你好04");
    return mv;
}

// 先于目標方法執(zhí)行，獲取了數據庫中的斗個對象的信息
@ModelAttribute
public void hahaMyModelAttribute(Map<String, Object> map){
        
Book book = new Book(100, "西游記", "吳承恩", 98, 10, 98.98);
    System.out.println("數據庫中查到的圖書信息是："+book);
    map.put("haha", book);
    b1 = book;
    o1 = map;
    System.out.println("modelAttribute方法...查詢了圖書并給你保存起來了...他用的map的類				型："+map.getClass());
    }
}

// 目標方法，在目標方法中使用查詢到的對象
@RequestMapping("/updateBook")
public String updateBook(@ModelAttribute("haha")Book book,Map<String, Object> model){
    o2 = model;
    b2  = book;
    Object haha = model.get("haha");
    //System.out.println("傳入的model："+model.getClass());
    System.out.println("o1==o2?"+(o1 == o2));
    System.out.println("b1==b2?"+(b1 == b2)+"-->"+(b2 == haha));
     System.out.println("頁面要提交過來的圖書信息："+book);
    return "success";
    }