<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="com.rao.struts2.bean.Sex"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>My JSP 'OGNL1.jsp' starting page</title>

  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->

 </head>

 <body>
  <%
   request.setAttribute("req", "request scope");
   request.getSession().setAttribute("sess", "session scope");
   request.getSession().getServletContext().setAttribute("app",
     "aplication scope");
  %>
 1.通过ognl表达式获取 属性范围中的值
  <br>
  <s:property value="#request.req" />
  <br />
  <s:property value="#session.sess" />
  <br />
  <s:property value="#application.app" />
  <br />
  <hr>
 2.通过<SPAN style="BACKGROUND-COLOR: #fafafa">ognl表达式创建list 集合 ,并且遍历出集合中的值
  <br>
  <s:set name="list" value="{'eeeee','ddddd','ccccc','bbbbb','aaaaa'}"></s:set>
  <s:iterator value="#list" var="o">
   <!-- ${o }<br/> -->
   <s:property />
   <br />
  </s:iterator>
  <br />
  <hr>
 3.通过ognl表达式创建Map 集合 ,并且遍历出集合中的值
  <br>
  <s:set name="map"
   value="#{'1':'eeeee','2':'ddddd','3':'ccccc','4':'bbbbb','5':'aaaaa'}"></s:set>
  <s:iterator value="#map" var="o">
   <!--   ${o.key }->${o.value }<br/>   -->
   <!-- <s:property value="#o.key"/>-><s:property value="#o.value"/><br/>   -->
   <s:property value="key" />-><s:property value="value" />
   <br />
  </s:iterator>
  <br />
  <hr>
 4.通过ognl表达式 进行逻辑判断
  <br>
  <s:if test="'aa' in {'aaa','bbb'}">
   aa 在 集合{'aaa','bbb'}中;
  </s:if>
  <s:else>
   aa 不在 集合{'aaa','bbb'}中;
  </s:else>

  <br />

  <s:if test="#request.req not in #list">
   不 在 集合list中;
  </s:if>
  <s:else>
   在 集合list中;
  </s:else>
  <br />
  <hr>
 5.通过ognl表达式 的投影功能进行数据筛选
  <br>
  <s:set name="list1" value="{1,2,3,4,5}"></s:set>
  <s:iterator value="#list1.{?#this>2}" var="o">
   <!-- #list.{?#this>2}:在list1集合迭代的时候,从中筛选出当前迭代对象>2的集合进行显示 -->
   ${o }<br />
  </s:iterator>
  <br />
  <hr>
 5.通过ognl表达式 访问某个类的静态方法和值
  <br>
  <s:property value="@java.lang.Math@floor(32.56)" />

  <s:property value="@com.rao.struts2.action.OGNL1Action@aa" />
  <br />
  <br />
  <hr>
 6.ognl表达式 迭代标签 详细
  <br>
  <s:set name="list2"
   value="{'aa','bb','cc','dd','ee','ff','gg','hh','ii','jj'}"></s:set>
  <table border="1">
   <tr>
    <td>
     索引
    </td>
    <td>
     值
    </td>
    <td>
     奇?
    </td>
    <td>
     偶?
    </td>
    <td>
     首?
    </td>
    <td>
     尾?
    </td>
    <td>
     当前迭代数量
    </td>
   </tr>
   <s:iterator value="#list2" var="o" status="s">
    <tr bgcolor="<s:if test="#s.even">pink</s:if>">
     <td>
      <s:property value="#s.getIndex()" />
     </td>
     <td>
      <s:property />
     </td>
     <td>
      <s:if test="#s.odd">Y</s:if>
      <s:else>N</s:else>
     </td>
     <td>
      <s:if test="#s.even">Y</s:if>
      <s:else>N</s:else>
     </td>
     <td>
      <s:if test="#s.first">Y</s:if>
      <s:else>N</s:else>
     </td>
     <td>
      <s:if test="#s.isLast()">Y</s:if>
      <s:else>N</s:else>
     </td>
     <td>
     <s:property value="#s.getCount()"/>
    </td>
    </tr>

   </s:iterator>
  </table>
  <br>
  <hr>
 7.ognl表达式:  if/else if/else 详细<br>
  <% request.setAttribute("aa",0); %>
  <s:if test="#request.aa>=0 && #request.aa<=4">
   在0-4之间;
  </s:if>
  <s:elseif test="#request.aa>=4 && #request.aa<=8">
   在4-8之间;
  </s:elseif>
  <s:else>
   大于8;
  </s:else>
  <br>
  <hr>
 8.ognl表达式: url 详细<br>
  <% request.setAttribute("aa","sss"); %>
  <s:url action="testAction" namespace="/aa/bb">
   <s:param name="aa" value="#request.aa"></s:param>
   <s:param name="id">100</s:param>
  </s:url>
  <br/>
  <s:set name="myurl" value="'http://www.baidu.com'"></s:set>
  value以字符处理:   <s:url value="#myurl"></s:url><br>
  value明确指定以ognl表达式处理:    <s:url value="%{#myurl}"></s:url>
  <br>
  <hr>
 9.ognl表达式: checkboxlist 详细<br>
  1> .list 生成;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
  name:checkboxlist的名字<br>
  list:checkboxlist要显示的列表<br>
  value:checkboxlist默认被选中的选项,checked=checked<br>
  <s:checkboxlist name="checkbox1" list="{'上网','看书','爬山','游泳','唱歌'}" value="{'上网','看书'}" ></s:checkboxlist>
  <br>
  以上生成代码:<br>
  <xmp>
   <input type="checkbox" name="checkbox1" value="上网" id="checkbox1-1" checked="checked"/>
   <label for="checkbox1-1" class="checkboxLabel">上网</label>
   <input type="checkbox" name="checkbox1" value="看书" id="checkbox1-2" checked="checked"/>
   <label for="checkbox1-2" class="checkboxLabel">看书</label>
   <input type="checkbox" name="checkbox1" value="爬山" id="checkbox1-3"/>
   <label for="checkbox1-3" class="checkboxLabel">爬山</label>
   <input type="checkbox" name="checkbox1" value="游泳" id="checkbox1-4"/>
   <label for="checkbox1-4" class="checkboxLabel">游泳</label>
   <input type="checkbox" name="checkbox1" value="唱歌" id="checkbox1-5"/>
   <label for="checkbox1-5" class="checkboxLabel">唱歌</label>"
  </xmp>
  2> .Map 生成;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
  name:checkboxlist的名字<br>
  list:checkboxlist要显示的列表<br>
  listKey:checkbox 的value的值<br>
  listValue:checkbox 的lablel(显示的值)<br>
  value:checkboxlist默认被选中的选项,checked=checked<br>
  <s:checkboxlist name="checkbox2" list="#{1:'上网',2:'看书',3:'爬山',4:'游泳',5:'唱歌'}" listKey="key" listValue="value" value="{1,2,5}" ></s:checkboxlist>
  <br>
  以上生成代码:<br>
  <xmp>
   <input type="checkbox" name="checkbox2" value="1" id="checkbox2-1" checked="checked"/>
   <label for="checkbox2-1" class="checkboxLabel">上网</label>
   <input type="checkbox" name="checkbox2" value="2" id="checkbox2-2" checked="checked"/>
   <label for="checkbox2-2" class="checkboxLabel">看书</label>
   <input type="checkbox" name="checkbox2" value="3" id="checkbox2-3"/>
   <label for="checkbox2-3" class="checkboxLabel">爬山</label>
   <input type="checkbox" name="checkbox2" value="4" id="checkbox2-4"/>
   <label for="checkbox2-4" class="checkboxLabel">游泳</label>
   <input type="checkbox" name="checkbox2" value="5" id="checkbox2-5" checked="checked"/>
   <label for="checkbox2-5" class="checkboxLabel">唱歌</label>
  </xmp>
  <hr>
 10.ognl表达式: s:radio 详细<br>
  <%
   Sex sex1 = new Sex(1,"男");
   Sex sex2 = new Sex(2,"女");
   List<Sex> list = new ArrayList<Sex>();
   list.add(sex1);
   list.add(sex2);
   request.setAttribute("sexs",list);
  %>
  这个与checkboxlist差不多;<br>
  1>.如果集合为javabean:<s:radio name="sex" list="#request.sexs" listKey="id" listValue="name"></s:radio><br>
  2>.如果集合为list:<s:radio name="sexList" list="{'男','女'}"></s:radio><br>
  3>.如果集合为map:<s:radio name="sexMap" list="#{1:'男',2:'女'}" listKey="key" listValue="value"></s:radio><br>
  <hr>
 11.ognl表达式: s:select 详细<br>
  这个与s:checkboxlist差不多;<br>
  1>.如果集合为javabean:<s:select name="sex" list="#request.sexs" listKey="id" listValue="name"></s:select><br>
  2>.如果集合为list:<s:select name="sexList" list="{'男','女'}"></s:select><br>
  3>.如果集合为map:<s:select name="sexMap" list="#{1:'男',2:'女'}" listKey="key" listValue="value"></s:select><br>
 到此主要的ognl</SPAN>标签已经介绍完毕...由于表单标签相对简单不介绍了....
 </body>
</html>