为什么在jsp页面上获取的常量值都为空？
claim_voucher_deal.jsp
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | <%@ page contentType="text/html;charset=UTF-8" language="java" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %><%@ page import="com.yuan.oa.global.Constant" %><jsp:include page="top.jsp"/><section id="content" class="table-layout animated fadeIn"> <div class="tray tray-center"> <div class="content-header"> <h2> 待处理报销单 </h2> <p class="lead"></p> </div> <div class="admin-form theme-primary mw1000 center-block" style="padding-bottom: 175px;"> <div class="panel heading-border"> <div class="panel-menu"> <div class="row"> <div class="hidden-xs hidden-sm col-md-3"> <div class="btn-group"> <button type="button" class="btn btn-default light"> <i class="fa fa-refresh"></i> </button> <button type="button" class="btn btn-default light"> <i class="fa fa-trash"></i> </button> <button type="button" class="btn btn-default light"> <i class="fa fa-plus" onclick="javascript:window.location.href='/claim_voucher/to_add';"></i> </button> </div> </div> <div class="col-xs-12 col-md-9 text-right"> <div class="btn-group"> <button type="button" class="btn btn-default light"> <i class="fa fa-chevron-left"></i> </button> <button type="button" class="btn btn-default light"> <i class="fa fa-chevron-right"></i> </button> </div> </div> </div> </div> <div class="panel-body pn"> <table id="message-table" class="table admin-form theme-warning tc-checkbox-1"> <thead> <tr class=""> <th class="text-center hidden-xs">Select</th> <th class="hidden-xs">事由</th> <th>状态</th> <th class="hidden-xs">创建人</th> <th class="hidden-xs">金额</th> <th class="text-center">创建时间</th> <th>操作</th> </tr> </thead> <tbody> <c:forEach items="${list}" var="cv"> <tr class="message-unread"> <td class="hidden-xs"> <label class="option block mn"> <input type="checkbox" name="mobileos" value="FR"> <span class="checkbox mn"></span> </label> </td> <td>${cv.cause}</td> <td class="hidden-xs"> <span class="badge badge-warning mr10 fs11">${cv.status}</span> </td> <td>${cv.creater.name}</td> <td class="text-center fw600">${cv.totalAmount}</td> <td><spring:eval expression="cv.createTime"/></td> <td> //为何这里的常量值都为空（如Constant.CLAIMVOUCHER_CREATED是个空字符串） <c:if test="${cv.status==Constant.CLAIMVOUCHER_CREATED || cv.status==Constant.CLAIMVOUCHER_BACK}"> <a href="/claim_voucher/details?id=${cv.id}">修改</a> <a href="/claim_voucher/details?id=${cv.id}">提交</a> </c:if> <c:if test="${cv.status==Constant.CLAIMVOUCHER_SUBMIT || cv.status==Constant.CLAIMVOUCHER_RECHECK}"> <a href="/claim_voucher/details?id=${cv.id}">打回</a> <a href="/claim_voucher/details?id=${cv.id}">审核</a> </c:if> <c:if test="${cv.status==Constant.CLAIMVOUCHER_APPROVED}"> <a href="/claim_voucher/details?id=${cv.id}">打款</a> </c:if> <a href="/claim_voucher/details?id=${cv.id}">${Constant.CLAIMVOUCHER_CREATED}详细信息${cv.status}</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div> </div> </div></section><jsp:include page="bottom.jsp"/> |
Constant.java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | package com.yuan.oa.global;import java.util.ArrayList;import java.util.List;//常量类public class Constant { //职务 public static final String POST_STAFF="员工"; public static final String POST_FM="部门经理"; public static final String POST_GM="总经理"; public static final String POST_CASHIER="财务"; //职务集合 public static List<String> getPosts() { List<String> list=new ArrayList<String>(); list.add(POST_STAFF); list.add(POST_FM); list.add(POST_GM); list.add(POST_CASHIER); return list; } //费用类型 public static List<String> getItems() { List<String> list=new ArrayList<String>(); list.add("交通"); list.add("餐饮"); list.add("住宿"); list.add("办公"); list.add("其他"); return list; } //报销单状态(不要忘了加final) public static final String CLAIMVOUCHER_CREATED="新创建"; public static final String CLAIMVOUCHER_SUBMIT="提交"; public static final String CLAIMVOUCHER_APPROVED="已审核"; public static final String CLAIMVOUCHER_BACK="已打回"; public static final String CLAIMVOUCHER_TEAMINATED="已终止"; public static final String CLAIMVOUCHER_RECHECK="待复审"; public static final String CLAIMVOUCHER_PAID="已打款"; //审核额度 public static final double LIMIT_CHECK=5000; //处理方式（处理状态）：不要忘了加final public static final String DEAL_CREATED="创建"; public static final String DEAL_SUBMIT="提交"; public static final String DEAL_UPDATE="修改"; public static final String DEAL_BACK="打回"; public static final String DEAL_REJECT="拒绝"; public static final String DEAL_PASS="通过"; public static final String DEAL_PAID="打款";} |
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你的现象好诡异，我测了一下也是能正常显示的。。。。我的是tomcat8.5 , jdk1.8
源自我心
2018-05-24 18:53:18
1 | ${Constant.CLAIMVOUCHER_CREATED} |
1 | <c:out value="${Constant.CLAIMVOUCHER_CREATED}"/> |
我使用了这两种方法还是没有取出常量值，显示的依然为空。
我这里的把常量值直接改成字符串，相应的这些链接是可以显示的，比如
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <td> <c:out value="${Constant.CLAIMVOUCHER_CREATED}"/> <c:if test="${cv.status=='新创建' || cv.status=='已打回'}"> <a href="/claim_voucher/to_update?id=${cv.id}">修改</a> <a href="/claim_voucher/submit?id=${cv.id}">提交</a> </c:if> <c:if test="${cv.status=='已提交' || cv.status=='待复审'}"> <a href="/claim_voucher/to_check?id=${cv.id}">审核</a> </c:if> <c:if test="${cv.status=='已审核'}"> <a href="/claim_voucher/to_check?id=${cv.id}">打款</a> </c:if> <a href="/claim_voucher/details?id=${cv.id}">详细信息</a></td> |
但是使用常量值就不行了
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