newModelAndView("/WEBINF/jsp/showData.jsp","message",message)

@RequestMapping(value="/mad/showData_1.do")
public ModelAndView showData_1(){
  String message = "这个是要传递的数据";
  /*其中第一个参数为url,第二个参数为要传递的数据的key,第三个参数为数据对象。在这里要注意的是:数据是默认被存放在request中的。*/
  return new ModelAndView("/WEB-INF/jsp/showData.jsp","message",message);
}

request:${requestScope.message}

@SessionAttributes({“message”,”user”})

session:${sessionScope.message}<br/>

//使用modelAndView对象将数据传递到前台。
//传递多个参数（不同类型的）
  @RequestMapping(value="/mad/showData_2.do")
  public ModelAndView showData_2(){
   System.out.println("showData_2");
   String message = "这个是要传递的数据";
   User user = new User("张三", 12, new Date());
   List<User> us= new ArrayList<User>();
   us.add(new User("张三", 12, new Date()));
   us.add(new User("张四", 13, new Date()));
   us.add(new User("张五", 14, new Date()));
   ModelAndView mad = new ModelAndView("/WEB-INF/jsp/showData.jsp");
   //将数据存入modelMap
   mad.addObject("message", message);
   mad.addObject(user);//默认为类名的首字母小写
   mad.addObject("users", us);
   return mad;
 }

request:${requestScope.message}<br/>
<c:forEach items="${requestScope.users }"var="u">
   ${u.name }-${u.age }-${u.birth }<br/>
  </c:forEach>

//使用modelMap对象将数据传递到前台。
  //传递多个参数（不同类型的）
  @RequestMapping(value="/mad/showData_3.do")
  public String showData_3(ModelMap map){
   System.out.println("showData_3");
   String message = "这个是要传递的数据";
   User user = new User("张三", 12, new Date());
   List<User> us= new ArrayList<User>();
   us.add(new User("张三", 12, new Date()));
   us.add(new User("张四", 13, new Date()));
   us.add(new User("张五", 14, new Date()));
   //将数据存入modelMap
   map.put("message", message);
   map.addAttribute("user", user);
   map.put("users", us);
   return"/WEB-INF/jsp/showData.jsp";
  }

request:${requestScope.message}<br/>
  session:${sessionScope.message }<br/>
  application:${applicationScope.message}<br/>
  <hr/>
  <h1>ModelMap中的数据</h1>
  ${requestScope.message}<br/>
  ${requestScope.user.name}<br/>
  <p>列表</p>
  <c:forEach items="${requestScope.users}" var="u">
   ${u.name }-${u.age }-${u.birth }<br/>
  </c:forEach>