Struct2.0 后台list数据传递到前端jsp面

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第一种方法

action:

    List<SysUserGroup> sysUserGroupList = sysUserGroupService.findSysUserGroups(null, null);
       //获取值栈
       ActionContext.getContext().getValueStack()
       .set("sysUserGroupList", sysUserGroupList);

jsp页面：

首先是导入：标签 <%@ taglib prefix="s" uri="/struts-tags"%>

    <s:iterator var="c" value="sysUserGroupList">
           <tr>
               <td>
                  <input type="checkbox" name="ids" value="12" class="checkbox" onClick="changeCheckCount();">
               </td>
                <td><a href="${pageContext.request.contextPath}/sys/sysUserGroupAction_edit.do"><s:property value="#c.name"/></a></td>
               <td><s:property value="#c.principal"/></td>
               <td><s:property value="#c.incumbent"/></td>
               <td><a href="javascript:OpenWin('${pageContext.request.contextPath}/sys/group/usersInGroup.jsp?id=12')">设置</a></td>
           </tr>
       </s:iterator>

第二种方法

使用一些Servlet API进行值的存取操作：HttpServletRequest、HttpSession和ServletContext。Struts2对这个三个对象用Map进行了封装，我们就可以使用Map对象来存取数据了。

ServletActionContext.getRequest().getSession().setAttribute("user", "张三");

jsp页面接收

session.getAttribute("user");

HttpServletRequest request=ServletActionContext.getRequest()request.setAttribute("c2", "test5");

Action 往浏览器界面传递参数：

方式有三种：

1）种：直接给Action 属性（有get/set方法）赋值，JSP中用

<s:property value="OGNL表达式"/> 取值，注意返回结果类型为forward

例如：

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

2）种：通过ActionContext传值，在Action中所调用的方法中加入：

<p><span style="font-family:Arial,Helvetica,sans-serif;line-height:22px; white-space:normal"><span class="typ">                      ActionContext</span><span class="pun">.</span><span class="pln">getContext</span><span class="pun">().</span><span class="pln">put</span><span class="pun">(</span></span><span style="font-family:Arial,Helvetica,sans-serif;line-height:22px; white-space:normal"><span class="str">"key"</span></span><span style="font-family:Arial,Helvetica,sans-serif;line-height:22px; white-space:normal"><span class="pun">,</span><span class="pln"> </span></span><span style="font-family:Arial,Helvetica,sans-serif;line-height:22px; white-space:normal"><span class="str">"value"</span></span><span style="font-family:Arial,Helvetica,sans-serif;line-height:22px; white-space:normal"><span class="pun">);</span><span class="pln">  </span></span></p>

JSP中用

<s:property value="#key"/>取值

例如：

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

3 ）种：通过request、session 传值。Action方法中通过取得HttpServletRequest 、HttpSession 和 Map对象设置值，

<span class="typ">                   ServletActionContext</span><span class="pun">.</span><span class="pln">getRequest</span><span class="pun">().</span><span class="pln">setAttribute</span><span class="pun">(</span><span class="str">"arg0"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"value"</span><span class="pun">);</span><span class="pln">  </span><span class="typ">                   ServletActionContext</span><span class="pun">.</span><span class="pln">getRequest</span><span class="pun">().</span><span class="pln">getSession</span><span class="pun">().</span><span class="pln">setAttribute</span><span class="pun">(</span><span class="str">"arg0"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"value"</span><span class="pun">);</span><span class="pln">  </span><span class="typ">                  ActionContext</span><span class="pun">.</span><span class="pln">getContext</span><span class="pun">().</span><span class="pln">getSession</span><span class="pun">().</span><span class="pln">put</span><span class="pun">(</span><span class="str">"key"</span><span class="pun">,</span><span class="pln"> </span><span class="str">"value"</span><span class="pun">);</span><span class="pln"> </span>

例如：

jsp页面

获取requets范围的值

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

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