struts2 <s:select>赋值方法

我的应用中，有个产品由哪个单位供应，所以在录入产品的时候供应商(厂家)希望是下来选择:
使用<s:select>一直报错：
tag 'select', field 'list', name 'supplierId': The requested list key '#product.getComPanys' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]

我分别采用了4中方法：上面报错只是其中一种，但4中方法报错都一致。。。我google、baidu了 看了N多贴依然是解决不了超级郁闷，还请给位多指教！！！

下面贴出我的类以及处理方法：

ProductAction

package model.activion;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import model.service.CompanyService;
import model.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import util.UtilRandow;
import util.UtilString;
import com.opensymphony.xwork2.ActionSupport;
import entity.Company;
import entity.Product;

@SuppressWarnings("serial")
public class ProductAction extends ActionSupport {
	@Autowired
	private ProductService productService;
	@Autowired
	private CompanyService companyService;

	private String productNo;
	private String productName;
	private String supplierId;
         
	private List<Company> comPanys;   [color=red]//第一种与第二种都采用List赋值[/color]
	private HashMap  mapCom;          [color=red]//第三种 才偶那个Map赋值[/color]
    //保存产品
    public String   saveProduct(){
    	Product product = new Product();
    	product.setProductNo("CP"+UtilRandow.getDateRandow());
    	product.setProductName(productName);
        product.setSupplierId(supplierId);
    	boolean falge = productService.addProduct(product);
    	
    	if (falge==true) return SUCCESS;
    	else return ERROR;
    }  
	public String getProductNo() {
		return productNo;
	}

	public void setProductNo(String productNo) {
		this.productNo = productNo;
	}

	public String getProductName() {
		return productName;
	}

	public void setProductName(String productName) {
		this.productName = productName;
	}
       
	public void setSupplierId(String supplierId) {
		this.supplierId = supplierId;
	}
	public String getSupplierId() {
		return supplierId;
	}
       [color=red]//Map 取值方法获取数据库种所有的company [/color]
	public HashMap getMapCom() {
		List<Company> ls = this.companyService.queryCompany(null, null);
    	   for(Company c :ls){
    		mapCom.put("companyId",c.getCompanyId());
    		mapCom.put("companyName",  c.getCompanyName());
    	   }
		return mapCom;
	}

	public void setMapCom(HashMap mapCom) {
		this.mapCom = mapCom;
	}
       [color=red]//List 取值方法获取数据库种所有的company [/color]
       public List<Company> getComPanys() {
		List<Company> comPanys = new ArrayList<Company>();
		comPanys = this.companyService.queryCompany(null, null);
		return comPanys;
	}

	public void setComPanys(List comPanys) {
		this.comPanys = comPanys;
	}
}

UtilBean:只是其中一个方法有使用  //第四种采用<s:bean>的方式赋值

package model.bean;
import java.util.ArrayList;
import java.util.List;
import model.service.CompanyService;
import org.springframework.beans.factory.annotation.Autowired;
import util.UtilString;
import entity.Company;
public class UtilBean {
	@Autowired
	private CompanyService companyService;
	private List<Company> lc  = new ArrayList<Company>();
	public List<Company> getLc() {
		List<Company> listCom  = this.companyService.queryCompany(null, null);
		if (UtilString.isEmpty(listCom)) lc = null;
		else lc = listCom;
		return lc;
	}
	public void setLc(List<Company> lc) {
		this.lc = lc;
	}
}

Struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	 <package name="model.activion" extends="struts-default">
                <!-- 输入校验-->
	 	<action name="validateProduct"
	 		class="model.activion.ProductAction">
	 		<result name="input">/jsp/product.jsp</result>
	 	</action>
	 	<action name="addProduct" class="model.activion.ProductAction"
	 		method="saveProduct">
	 		<result name="success">/jsp/success.jsp</result>
	 		<result name="error">/jsp/error.jsp</result>
	 		<result name="input">/jsp/product.jsp</result>
	 	</action>	 	
	 </package>
</struts>

JSP界面：product.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
	<head>
		<title>产品信息</title>
                <s:head theme="ajax"/>
	</head>
	<body>
		<center>
			<s:tabbedPanel id="productList" theme="ajax" doLayout="false" closeButton="pane"
				labelposition="top" selectedTab="product" >
				<s:div id="product" theme="ajax" label="基本信息">
					<s:form action="validateProduct" validate="true">
						<s:textfield name="productNo" label="产品编号" readonly="true" />
						<s:textfield name="productName" label="产品名称" required="true" />
						<!-- 第1种  List-->
						<s:select list="companys" listKey="companyId"
							listValue="companyName" name="supplierId" label="厂家名称"
							headerKey="" headerValue="" />
						<!-- 第2种 List-->						
						<s:action name="product" id="getComPanys" />
						<s:select list="#product.getComPanys" listKey="companyId"
							listValue="companyName" name="supplierId" label="厂家名称"
							headerKey="" headerValue="" />
						<!-- 第3种 Map-->
						<s:select list="mapCom" key="companyId"
							value="companyName" name="supplierId" label="厂家名称"
							headerKey="" headerValue="" />
						<!-- 第4种 List-->
						<s:bean id="ub" name="model.action.UtilBean" />
						<s:select list="#ub.lc" listKey="companyId"
							listValue="companyName" name="supplierId" label="厂家名称"
							headerKey="" headerValue="" />
						<s:submit value="确定" action="addProduct" />
						<s:reset value="重置" />
					</s:form>
				</s:div>
				<!-- 图片上传未处理  -->
				<s:div id="image" theme="ajax" label="图片上传">
					<s:form>
						<s:textfield name="productName" label="产品名称"/>
						<s:file name="file" accept="jpeg/gif/*" label="图片一"/>
						<s:file name="file" accept="jpeg/gif/*" label="图片二"/>
						<s:file name="file" accept="jpeg/gif/*" label="图片三"/>
						<s:submit value="上传" />
						<s:reset value="重置" />
					</s:form>
				</s:div>
			</s:tabbedPanel>
		</center>
	</body>
</html>

实体类：
供应商：company

package entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name = "bsc_company", catalog = "jxc_db")
public class Company implements java.io.Serializable {

	// Fields

	private String companyId;
	private String companyNo;
	private String companyName;

        @GenericGenerator(name = "generator", strategy = "uuid.hex")
	@Id
	@GeneratedValue(generator = "generator")
	@Column(name = "company_id", unique = true, nullable = false, length = 50)
	public String getCompanyId() {
		return this.companyId;
	}

	public void setCompanyId(String companyId) {
		this.companyId = companyId;
	}

	@Column(name = "company_no", length = 50)
	public String getCompanyNo() {
		return this.companyNo;
	}

	public void setCompanyNo(String companyNo) {
		this.companyNo = companyNo;
	}

	@Column(name = "company_name", length = 50)
	public String getCompanyName() {
		return this.companyName;
	}

	public void setCompanyName(String companyName) {
		this.companyName = companyName;
	}
}

首先保证;

 List<Company> listCom  = this.companyService.queryCompany(null, null);  

返回一定有值！！！

总结的好!

在第一种list=companys改成list=%{companys}试试。

谢谢 楼上兄弟 我试试看 !!!