struts2第七天总结（ognl标签的使用）

在Action中存值

public String ognltest1(){

ActionContext ac=ActionContext.getContext();

ac.put("username", "request-chenhj");

ac.getSession().put("username", "session-chenhj");

ac.getApplication().put("username", "application-chenhj");

ac.put("user", new Users(1,"张三","123","[e-mail]"));

ac.getSession().put("user", new Users(2,"lisi","1ad2adad3","[e-mail]"));

ac.getApplication().put("user", new Users(3,"adada","1ad23","[e-mail]"));

return SUCCESS;

}

//在jsp页面中取值

<div align="center">

<div id="ognl1">

<h3>显示request,session,application采用ognl表达式</h3><br>

request:<s:property value="#request.username"/><br>

session:<s:property value="#session.['username']"/><br>

application:<s:property value="#application.username"/><br>

</div>

</div>

讲解：

private User user;

必须提供get方法 才能在页面中通过上述标签获取

如果 在域中 直接存放对象 也可以采用上面的标签获取

分析：

第一个案例：struts_scope案例

第二个案例:struts_ognl

Context --_root和valueStack root是一样

Root;值栈

如果访问action之后比如：UserAction_ognltest1.action

Root 第一个对象：当前Action

第二个对象：DefaultTextProvider

对象栈：

valueSack.getRoot().add(new Users(1,”chenhj”,”123”,”[e-mail]”));

valueSack.getRoot().add(new Users(2,”zhangsan”,”123”,”[e-mail]”));

valueSack.getRoot().add(0,new Users(1,”chenhj”,”123”,”[e-mail]”));

valueSack.getRoot().add(1,new Users(2,”zhangsan”,”123”,”[e-mail]”));

语法#{key:value,key1:value1,key2:value2}

案例：

<s:iterator var="entity" value="#{1:'chenhj',2:'caojianbo',3:'liqiang' }">

<s:property value="key"/>

<s:property value="value"/>

<%-- <s:property value="#entity.key"/>

<s:property value="#entity.value"/> --%>

</s:iterator>

构造List

语法:{value1，value2,value3}

<s:iterator var="edu" value="{'java','php','3g'}">

<s:property/>

<s:property value="edu"/>

</s:iterator>

单选按钮：

<s:radio list="#{'w':'女','m':'男' }" listKey="key" listValue="value" value="'w'"></s:radio>

<br>

<s:radio name="sex" list="#{'1':'男','0':'女'}" value="'0'"></s:radio>

<br>

<s:radio list="{'女','男'}" value="'女'"></s:radio>

多选按钮：

<s:checkbox label="看书" name="fav"></s:checkbox>

<s:checkbox label="打篮球" name="fav"></s:checkbox>

<s:checkbox label="写字" name="fav"></s:checkbox>

<s:checkbox label="读书" name="fav"></s:checkbox>

<br>

<s:checkboxlist name="fav" list="{'看书','打篮球','写字','读书'}" value="{'读书','打篮球'}" />

<br>

<s:checkboxlist name="fav" list="#{1:'看书',2:'打篮球',3:'写字',4:'读书'}" listKey="key" listValue="value" value="{1,2,3}"/>

下拉列表：

<s:select label="Months" name="moths" headerKey="-1" headerValue="选择月份" list="#{'01':'Jan','02':'Feb','03':'Mat' }" value="selectedMonth" required="false"></s:select>

<br>

<s:select list="{'java','3g','php','.net'}" label="选择专业" name="edu" value="'.net'"></s:select>

<br>

<s:select list="#{1:'瑜伽',2:'户外'}" name="map" value="1"></s:select>

<hr>

if标签：

<s:if test="'Java' not in{'Java','Net'}">

Java in

</s:if>

<s:else>

Java not in

</s:else>

Set标签

<s:set var="msg" value="'aaa<br/>aaaaaa'" scope="request" ></s:set>

<s:property value="#requestmsg" escape="false"/>

<hr>

push:

<s:push value="'abc'">

<s:property/>

</s:push>

<hr>

Bean标签：

<s:bean name="www.csdn.struts2_tag.domain.Users" var="myUsers">

<s:param name="id" value="1"/>

<s:param name="name" value="'hahaha'"/>

<s:param name="pass" value="'123'"/>

<s:param name="email" value="'[e-mail]'"/>

<s:property value="name"/>

</s:bean>

输出1：

<s:property value="#myUsers.name"/>

<s:set var="user" value="#myUsers"></s:set>

输出2：

<s:property value="#user.name"/>

<hr>

iterator标签:

<table border="1">

<s:iterator var="name" value="{'java','net','php','3g'}" status="st">

<tr class="<s:property value='#st.even?"even":"odd"'/>">

<td>

<s:property value="name"/>

</td>

</tr>

</s:iterator>

</table>