Spring MVC 之传递模型数据到视图中

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类似于 JSP-Servlet 中的 req.setAttribute 、 req.getSession().setAttribute ...

--> 最后在 JSP 用 EL 表达式取得这些数据对象，

STEP-1 传递模型数据的三种方式

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;

    @Autowired

    public SpittleController(SpittleRepository spittleRepository) {

        this.spittleRepository = spittleRepository;

    }

    @RequestMapping(value="/spittles", method=GET)

    public List<Spittle> spittles() {

        return spittleRepository.findSpittles(Long.MAX_VALUE, 20);

    } // 采用用无 String 的方式传递模型数据到视图

      // --> 属性名推断为 spittleList

      // --> 视图名称推断为 spittles --> 去掉了 /

//    public String spittles(Model model) {

//        model.addAttribute(spittleRepository.findSpittles(Long.MAX_VALUE, 20));

//        return "spittles";

//    } 这是等价方法-1：半自定义 --> 自定义视图名

//    public String spittles(Model model) {

//        model.addAttribute("myList", spittleRepository.findSpittles(Long.MAX_VALUE, 20));

//        return "spittles";

//    } 这是等价方法-2：高度自定义。 --> 自定义视图名以及属性名

}

STEP-2 在 JSP 页面中获取数据

<%@ 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>