Spring MVC 之傳遞模型數據到視圖中
阿新 • • 發佈：2017-07-16
sage size efi ram fix post head bmi 傳遞
類似於 JSP-Servlet 中的 req.setAttribute 、 req.getSession().setAttribute ...
--> 最後在 JSP 用 EL 表達式取得這些數據對象，
STEP-1 傳遞模型數據的三種方式
package spittr.web; import static org.springframework.web.bind.annotation.RequestMethod.GET; import java.util.List; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import spittr.Spittle; import spittr.data.SpittleRepository; @Controller public class SpittleController { private SpittleRepository spittleRepository; @Autowiredpublic SpittleController(SpittleRepository spittleRepository) { this.spittleRepository = spittleRepository; } @RequestMapping(value="/spittles", method=GET) public List<Spittle> spittles() { return spittleRepository.findSpittles(Long.MAX_VALUE, 20); }// 采用用無 String 的方式傳遞模型數據到視圖 // --> 屬性名推斷為 spittleList // --> 視圖名稱推斷為 spittles --> 去掉了 / // public String spittles(Model model) { // model.addAttribute(spittleRepository.findSpittles(Long.MAX_VALUE, 20)); // return "spittles"; // } 這是等價方法-1：半自定義 --> 自定義視圖名 // public String spittles(Model model) { // model.addAttribute("myList", spittleRepository.findSpittles(Long.MAX_VALUE, 20)); // return "spittles"; // } 這是等價方法-2：高度自定義。 --> 自定義視圖名以及屬性名 }
STEP-2 在 JSP 頁面中獲取數據
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <%@ taglib prefix="s" uri="http://www.springframework.org/tags"%> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <html> <head> <title>Spitter</title> <link rel="stylesheet" type="text/css" href="<c:url value="/resources/style.css" />" > </head> <body> <div class="spittleForm"> <h1>Spit it out...</h1> <form method="POST" name="spittleForm"> <input type="hidden" name="latitude"> <input type="hidden" name="longitude"> <textarea name="message" cols="80" rows="5"></textarea><br/> <input type="submit" value="Add" /> </form> </div> <div class="listTitle"> <h1>Recent Spittles</h1> <ul class="spittleList"> <c:forEach items="${spittleList}" var="spittle" > <li id="spittle_<c:out value="spittle.id"/>"> <div class="spittleMessage"><c:out value="${spittle.message}" /></div> <div> <span class="spittleTime"><c:out value="${spittle.time}" /></span> <span class="spittleLocation">(<c:out value="${spittle.latitude}" />, <c:out value="${spittle.longitude}" />)</span> </div> </li> </c:forEach> </ul> <%-- <c:if test="${fn:length(spittleList) gt 20}"> <hr /> <s:url value="/spittles?count=${nextCount}" var="more_url" /> <a href="${more_url}">Show more</a> </c:if> --%> </div> </body> </html>
Spring MVC 之傳遞模型數據到視圖中