EL表达式, JSTL, 获取map集合中key的value

灰太狼 2024-02-17 14:59 54阅读 0赞

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>();
    	}
    
    	@Resource
    	public 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:;" οnclick="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>${dataItem.roleDesc}</td>
    						<td class="operation"><a href="javascript:;"
    							οnclick="edit(${dataItem.id});"> <img
    								src="./css/images/operation/pencil.png"
    								title="修改角色信息" />
    						</a>  <a href="javascript:;"
    							οnclick="roleResourceSet(${dataItem.id});"> <img
    								src="./css/images/operation/folder.png"
    								title="角色权限" />
    						</a> <a href="javascript:;"
    							οnclick="delRole(${dataItem.id},'${dataItem.roleName}');"> <img
    								src="./css/images/operation/trashcan_delete.png"
    								title="删除角色" />
    						</a></td>
    					</tr>
    					</c:forEach>
    				</table>
    				<table class="table top_line">
    					<tr>
    						<td>
    							<table cellpadding="0" cellspacing="0" border="0">
    								<tr>
    									<td class="all_action"><input name="allChkbox"
    										id="allChkbox" type="checkbox"
    										οnclick="pilicat.select_all(this.form);" /></td>
    									<td> 全选/取消  </td>
    									<td class="operation"></td>
    								</tr>
    							</table>
    						</td>
    					</tr>
    				</table>
    			</form>
    			<table class="page" cellpadding="0" cellspacing="5">
    				<tr>
    					<td>
    						<div id="pageNav" class="scott">
    							<font color="#88af3f">共${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>