selectManyMenu有三种实现方式

有三种方式：
(1)
页面中：
<h:selectManyMenu value="#{parameterList.categoryIds}">
      <s:selectItems value="#{siteList.resultList}" var="category" label="#{category.name}"/>     
</h:selectManyMenu>
解释：#{siteList.resultList}是个查询出来的集合。label="#{category.name}"实际显示出name来，
     用value="#{parameterList.categoryIds}"来获取直实际上是个一条一条的记录，然后从而可以获取到它对应的ID直。
     但是这中方式只能使用与seam自己产生出来的siteList.java中。因为那个页面中可以直接用#{siteList.resultList}，所以那样写很好。
     如果用这个标签的话：s:selectItems来做选项的话，里面value="#{siteList.属性}"，如果用属性的话，这个属性的类型必须是SelectItem，要这样定一private List<SelectItem> cities;


(2)
页面中：
<h:selectManyMenu style="height:100;" value="#{selectManyMenuBean.selCities}">
    <f:selectItems value="#{selectManyMenuBean.cities}" />
</h:selectManyMenu>

类中：
public class SelectManyMenuBean {
    private List<String> languages;
    private List<SelectItem> cities;
    private List<String> selCities;

    public SelectManyMenuBean() {
        cities = new ArrayList<SelectItem>();
        cities.add(new SelectItem("Chennai"));
        cities.add(new SelectItem("Bangalore"));
        cities.add(new SelectItem("Pune"));
        cities.add(new SelectItem("Delhi"));
        cities.add(new SelectItem("Mumbai"));
    }

    public List<SelectItem> getCities() {
        return cities;
    }

    public void setCities(List<SelectItem> cities) {
        this.cities = cities;
    }

    public List<String> getSelCities() {
        return selCities;
    }

    public void setSelCities(List<String> selCities) {
        this.selCities = selCities;
    }



解释:cities是个selectManyMenuBean类的属性


(3)
<h:selectManyMenu style="height:100;" value="#{selectManyMenuBean.languages}">
   <f:selectItem itemLabel="Java" itemValue="Java" />
   <f:selectItem itemLabel="C" itemValue="C"/>
   <f:selectItem itemLabel="C++" itemValue="C++"/>
</h:selectManyMenu>


(4)
					
<ui:define name="label">Select Sites</ui:define>
<h:selectManyMenu value="#{newscreate.chosesites}" style="width:115px;height:80px;">
    <c:forEach items="#{newscreate.siteResults}" var="site">
      <f:selectItem itemValue="#{site.id}" itemLabel="#{site.name}"></f:selectItem>
    </c:forEach>
</h:selectManyMenu>

类中：
private List<Long> chosesites;
private List<Site> siteResults;

public List<Site> getSiteResults() {
//		siteResults = new ArrayList<Site>();
		Long userid = user2.getId();
		siteList.setEjbql("select s from UserSite userSite,Site s where userSite.siteId=s.id and userSite.userId = "+userid);
		if(siteList.getResultCount()>0){
			return siteList.getResultList();
		}else{
			return null;
		}
		
	}

	public void setSiteResults(List<Site> siteResults) {
		this.siteResults = siteResults;
	}



public List<Long> getChosesites() {
		return chosesites;
	}

	public void setChosesites(List<Long> chosesites) {
		this.chosesites = chosesites;
	}