Struts2动态下拉列表实现【action+struts2标签】

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采用action+struts2标签实现

action负责响应视图请求，从后台调出数据，回传到视图

struts2标签负责生成下拉列表

例子：

数据库：

表名upfilekind

id 类别编号

kindname 类别名称

项目中domain包中映射类 Upfilekind

属性 id kindname （getter setter方法）

项目中dao包UpfilekindDao ||| daoImpl包下 UpfilekindDaoImpl

项目中service包UpfilekindService |||serviceImpl报下 UpfilekindServiceImpl

Action包下代码：UpfilekindAction

package com.ds.action;import java.util.List;import org.apache.struts2.ServletActionContext;import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.Namespace;import org.apache.struts2.convention.annotation.Result;import org.springframework.beans.factory.annotation.Autowired;import com.ds.domain.Upfilekind;import com.ds.service.UpfilekindService;@Namespace("/upfilekind")public class UpfilekindAction {@Autowiredprivate UpfilekindService upfilekindService;private Upfilekind upfilekind;public UpfilekindService getUpfilekindService() {return upfilekindService;}public void setUpfilekindService(UpfilekindService upfilekindService) {this.upfilekindService = upfilekindService;}public Upfilekind getUpfilekind() {return upfilekind;}public void setUpfilekind(Upfilekind upfilekind) {this.upfilekind = upfilekind;}@Action(value="browseUpfilekind",results={@Result(name="success",location="/success.jsp")})public String browseUpfilekind(){List<Upfilekind> kindlist = upfilekindService.searchAll();ServletActionContext.getRequest().setAttribute("kindlist",kindlist);return "success";}}

这里面：取出存储类名称的list 命名为kindlist Requst中的名称为kindlist

在jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%@ taglib prefix="s" uri="/struts-tags" %><%@taglib uri= "http://java.sun.com/jsp/jstl/core" prefix= "c" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">  </head>    <body>  <s:action name="browseUpfilekind" namespace="/upfilekind" executeResult="false"></s:action>    <s:select name="upfilekind.kindname" list="#request.kindlist" listKey="kindname" listValue="kindname">    </s:select>  </body></html>

这里面先用一个action来响应请求将executeResult设为false

在select中 list属性从request中取得kindlist listKey和listValue 为你想要取得的字段名称和想要显示的字段名称

Ok 测试