javascript调用java List示例

来源：互联网发布：手机版玻璃优化软件编辑：程序博客网时间：2024/05/17 21:52

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}'] = '${item.name}';    </c:forEach>  function selectChange(id) {      var selectOption = document.getElementById(id);      var linkURL = document.getElementById("linkUrl");      if (selectOption.value === "") {         linkURL.innerHTML="<a href=\"\" target=_blank>友情链接</a>";      }      else {          if (values[selectOption.value] === undefined ) {             linkURL.innerHTML="<a href=\"\" target=_blank>友情链接</a>";          }          else {             linkURL.innerHTML="<a href=" + values[selectOption.value] + " target=_blank> project '"+ values[selectOption.value]+ "'</a>";          }      }      console.log("key:" + selectOption.value + " value:" + values[selectOption.value]);   }  </script></head><body><div style="padding-bottom: 1em;"><div >  <br/>  <form name="demo">    <table >      <tbody>        <tr>          <td><span >please select item id &nbsp;</span>          <td align="left" width="20%">          <select id="selectItemID" name="itemID" onchange="selectChange(this.id)">          <c:forEach var="itemId"  items="${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

代码重点

<script type="text/javascript">    var values = {};    <c:forEach var="item" items="${itemList}">        values['${item.uuid}'] = '${item.name}';    </c:forEach>

1 0