javascript调用java List示例

港控/mmm° 2022-07-15 02:42 151阅读 0赞

这里演示一个javascript调用java List的例子。例子中我们使用jsp页面，jsp页面通过servlet或者spring mvc的controller获得一个list对象，然后将该list对象遍历后存储成map形式(List中的对象有uuid和name属性)，然后我们在页面上选择uuid，下面的文字显示该uuid对应的name。 例子比较简单，主要是为了说明如何js如何在jsp页面中调用java List对象。

直接上代码：

<%@ page import="java.util.*" %>
    <%@ page import="java.lang.String" %>
    
    <%@page import="com.quickcd.common.entity.Project" %>
    <%@page import="com.quickcd.common.entity.AgentPool" %>
    <%@page import="com.quickcd.common.service.AgentPoolService" %>
    <%@page import="com.quickcd.web.common.QCWebConstants" %>
    
    
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
    <%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
    
    <%@ page language="java" contentType="text/html; charset=UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>JS call the java list </title>
    <% List<Project> projectList = (List<Project>) pageContext.findAttribute(QCWebConstants.ALL_PROJECT_LIST); pageContext.setAttribute("itemList", projectList); List<String> projectIDList = (List<String>) pageContext.findAttribute("ALL_PROJECT_ID_LIST"); pageContext.setAttribute("itemIdList", projectIDList); %>
    
    <script type="text/javascript"> var values = {}; <c:forEach var="item" items="${itemList}"> values['${item.uuid}'] = '${item.name}'; </c:forEach> function selectChange(id) { var selectOption = document.getElementById(id); var linkURL = document.getElementById("linkUrl"); if (selectOption.value === "") { linkURL.innerHTML="<a href=\"\" target=_blank>友情链接</a>"; } else { if (values[selectOption.value] === undefined ) { linkURL.innerHTML="<a href=\"\" target=_blank>友情链接</a>"; } else { linkURL.innerHTML="<a href=" + values[selectOption.value] + " target=_blank> project '"+ values[selectOption.value]+ "'</a>"; } } console.log("key:" + selectOption.value + " value:" + values[selectOption.value]); } </script>
    </head>
    <body>
    
    <div style="padding-bottom: 1em;">
    <div >
    
      <br/>
    
      <form name="demo">
        <table >
          <tbody>
            <tr>
              <td><span >please select item id  </span>
              <td align="left" width="20%">
              <select id="selectItemID" name="itemID" onchange="selectChange(this.id)">
              <c:forEach var="itemId" items="${itemIdList}">
                  <option value="${itemId}">
                     ${itemId}
                   </option>
              </c:forEach>
            </tr>
            <tr>
              <td colspan="3">
               <c:choose>
                 <c:when test="${fn:length(itemList) eq 1}">
                     <div id="linkUrl"><a target="_blank" href="${itemList[0].name}">hyper links click here</a> </div>
                 </c:when>
                 <c:otherwise>
                     <div id="linkUrl"><a href="">友情链接</a></div>
                 </c:otherwise>
                </c:choose>
              </td>
            </tr>
          </tbody>
        </table>
      </form>
    </div>
    </div>
    </body>
    </html>

页面实际效果

![这里写图片描述][20161030162035774]

代码重点

[20161030162035774]: /images/20220715/2e824596a2414fc2bac2afce65801809.png