EL表达式, JSTL, 获取map集合中key的value

标签：function EL map jBox value dataMap import id page

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>

标签：function,EL,map,jBox,value,dataMap,import,id,page
From： https://blog.51cto.com/u_4679008/5883755

EL表达式, JSTL, 获取map集合中key的value

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