EL表达式, JSTL, 获取map集合中key的value

来源：互联网发布：caffe 数据增强编辑：程序博客网时间：2024/05/17 06:56

序言：今天在项目中使用了map存储list和普通对象，但是在jsp中显示的时候出来问题，后经查阅，终于解决，现在记录一下，以便以后查阅：

一：后台代码如下：

package cn.gov.csrc.cms.action;import java.util.HashMap;import java.util.Map;import javax.annotation.Resource;import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.Result;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import cn.gov.csrc.base.action.BaseAction;import cn.gov.csrc.cms.model.RoleInfo;import cn.gov.csrc.cms.service.RoleService;import cn.gov.csrc.cms.util.PageData;import cn.gov.csrc.cms.util.PageNavUtil;import com.opensymphony.xwork2.ActionContext;@Controller@Scope("prototype")public class RoleAction extends BaseAction<RoleInfo>{private static Logger logger = LoggerFactory.getLogger(RoleAction.class);private static final long serialVersionUID = 1L;private Integer page;private Map<String, Object> dataMap;private RoleService roleService;public RoleAction() {dataMap = new HashMap<String, Object>();}@Resourcepublic void setRoleService(RoleService roleService) {this.roleService = roleService;}@Action(value = "RoleAction_find", results={@Result(name = "success", location = "/ucenter/sys/roleList.jsp")})public String find(){page = page == null ? 1 : page < 1 ? 1:page;int pageSize = 5;PageData<RoleInfo> pageData = this.roleService.getRoles(page,pageSize,model.getRoleName());dataMap.clear();dataMap.put("dataList", pageData.getPageData());dataMap.put("totalCount", pageData.getTotalCount());dataMap.put("totalPage", pageData.getTotalPage());dataMap.put("currentPage", page);dataMap.put("pageNav", PageNavUtil.getPageNavHtml(page.intValue(), pageSize, pageData.getTotalCount(), 15));ActionContext.getContext().getSession().put("dataMap", dataMap);return "success";}public Integer getPage() {return page;}public void setPage(Integer page) {this.page = page;}}

二：前台jsp代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ include file="../../common/include_tag.jsp"%><%@ include file="../../common/page_var.jsp"%><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title><%=pageTitle%> - 角色管理</title><%@ include file="../../common/page_head.jsp"%><script type="text/javascript">    function add(){    $.jBox("iframe:#.action", {        title: "添加角色",        width: 700,        height: 320,        buttons: {}    });    }    function edit(id){    $.jBox("iframe:#.action?id="+id, {        title: "修改角色",        width: 700,        height: 320,        buttons: {}    });    }        function delRole(id,msg){    $.jBox.confirm("确定删除 ["+msg+"] 角色吗？", "确认操作", function (v, h, f) {        if (v == 'ok'){        $.post("#.action",{id:id},function(responseText){        if(responseText==true){        $.jBox.info("操作成功，请刷新查看结果", "成功信息",{top: '20%'});        }else{        $.jBox.error("操作失败", "失败信息");        }        });    }        return true;     },{top: '40%'});    }        function changeRoleStatus(id,status){    $.jBox.confirm("确定 "+(status==0?"禁用":"启用")+" 用户吗？", "确认操作", function (v, h, f) {        if (v == 'ok'){        $.post("#.action",{id:id,status:status},function(responseText){        if(responseText==true){        $.jBox.info("操作成功，请刷新查看结果", "成功信息",{top: '20%'});        }else{        $.jBox.error("操作失败", "失败信息");        }        });    }        return true;     },{top: '40%'});    }        function roleResourceSet(roleId){    $.jBox("iframe:#.action?roleId="+roleId, {        title: "角色资源授权",        width: 700,        height: 550,        buttons: {}    });    }        $().ready(function(){    pilicat.alternately('list');    });    </script></head><body><div style="height: 60px; overflow: hidden"><%@ include file="../u_top.jsp"%></div><div id="frame_side"><%@ include file="../u_login_info.jsp"%><jsp:include page="../u_left_menu.jsp" flush="true"><jsp:param name="current" value="roles" /></jsp:include></div><div id="body_box"><table cellpadding="0" cellspacing="0" border="0" class="icon"><tr><td></td></tr></table><span style="text-align: left;padding-left: 10px;">系统管理 -> 角色管理 -> 角色列表</span><table cellpadding="0" cellspacing="0" border="0" class="table"><tbody><tr><td valign="top" align="right"><form action="" method="get" name="search" id="search"><table cellpadding="0" cellspacing="5" border="0"><tbody><tr><td><a class="button_4" href="javascript:;" onclick="add();">添加新角色</a></td></tr></tbody></table></form></td></tr></tbody></table><div class="rounded table"><form action="" method="get" name="search_form" id="search_form"><table width="100%" cellpadding="0" cellspacing="0" border="0"class="box_top"><tr><td class="title">角色列表</td><td></td></tr></table></form><form action="" method="post" name="manage" id="manage"><table class="list td_align" cellpadding="0" cellspacing="1"border="0"><tr><td class="field_head" width="30">选择</td><td class="field_head">角色ID</td><td class="field_head">角色名称</td><td class="field_head">角色描述</td><td class="field_head">操作</td></tr><c:forEach items="${dataMap.dataList}" var="dataItem" varStatus="rowStatus"><tr><td><input type="checkbox" name="cbitem" value="${dataItem.id }" /></td><td>${dataItem.id}</td><td>${dataItem.roleName}</td><td>${dataItem.roleDesc}</td><td class="operation"><a href="javascript:;"onclick="edit(${dataItem.id});"> <imgsrc="./css/images/operation/pencil.png"title="修改角色信息" /></a>  <a href="javascript:;"onclick="roleResourceSet(${dataItem.id});"> <imgsrc="./css/images/operation/folder.png"title="角色权限" /></a> <a href="javascript:;"onclick="delRole(${dataItem.id},'${dataItem.roleName}');"> <imgsrc="./css/images/operation/trashcan_delete.png"title="删除角色" /></a></td></tr></c:forEach></table><table class="table top_line"><tr><td><table cellpadding="0" cellspacing="0" border="0"><tr><td class="all_action"><input name="allChkbox"id="allChkbox" type="checkbox"onclick="pilicat.select_all(this.form);" /></td><td> 全选/取消  </td><td class="operation"></td></tr></table></td></tr></table></form><table class="page" cellpadding="0" cellspacing="5"><tr><td><div id="pageNav" class="scott"><font color="#88af3f">共${dataMap["totalCount"]} 条数据， ${dataMap["totalPage"]} 页</font>${dataMap["pageNav"]}</div></td></tr></table></div><%@ include file="../u_bottom.jsp"%></div></body></html>

注：主要是下面的分页显示：

<div id="pageNav" class="scott"><font color="#88af3f">共${dataMap["totalCount"]} 条数据， ${dataMap["totalPage"]} 页</font>${dataMap["pageNav"]}</div>

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