ssh中在Action中的对象的属性存在,但jsp在页面显示不出,什么原因

Action中代码
public class ToUpdateAdminPasswordAction extends BaseAction{ //output private AdminVO admin; public String execute(){ admin=(AdminVO) session.get("admin"); System.out.println("action....id="+admin.getId()+" "+admin.getPassword()+" "+admin.getName());
//该行输出action....id=2144 123 wangwu1
if(admin!=null){ return "success"; }else{ return "error"; } } public Admin getAdminVO() { return admin; } public void setAdmin(AdminVO admin) { this.admin = admin; } }JSP中代码部分代码
<form action="" method="" class="main_form"> <div class="text_info clearfix"><span>管理员账号：</span></div> <div class="input_info"> <s:textfield name="admin.adminCode" cssClass="readonly" readonly="true"></s:textfield> </div> <div class="text_info clearfix"><span>角色：</span></div> <div class="input_info"><%--<s:textfield name="admin.rolesName" cssClass="readonly width400" readonly="true"></s:textfield> </div>
</form>