Question

当我将值设为{zdsqlBean.zdljs}时，我可以得到我想要的结果。

<h:outputLabel value="#{msgs.zdlj}" style="font-weight:bold" />
<p:selectOneMenu id="zdlj2" value="#{zsjBean.zdlj}">
    <f:selectItems value="#{zdsqlBean.zdljs}" var="bll4"
                   itemLabel="#{bll4.descri}" itemValue="#{bll4.value}" />
</p:selectOneMenu>

但是当我把值设为{zdsqlBean.thszfas}时，我无法得到我想要的结果。

<h:outputLabel value="#{msgs.zdlj}" style="font-weight:bold" />
<p:selectOneMenu id="zdlj2" value="#{zsjBean.zdlj}">
    <f:selectItems value="#{zdsqlBean.thszfas}" var="bll4"
                   itemLabel="#{bll4.descri}" itemValue="#{bll4.value}" />
</p:selectOneMenu>

为什么呢？以下是zdsqlBean：

@ManagedBean(name = "zdsqlBean")
@SessionScoped

public class ZdsqlBean {

    private List<Zdsql> zdsqls;
    private List<Zdsql> zdljs;
    private List<Zdsql> thszfas;


    public ZdsqlBean(){
        this.genzdljs();
        this.getThszfas();
    }   


    public List<Zdsql> getZdsqls() {
        return zdsqls;
    }

    public List<Zdsql> getThszfas() {

        System.out.println("zdsqls1==");

        return thszfas;
    }

    public List<Zdsql> getZdljs() {
        return zdljs;
    }


    public void genzdljs() {
        try {
            String queryString = "select m from Zdsql m where m.filter = :filter Order by m.id";
            TypedQuery<Zdsql> query = DBDAO.getEntityManager().createQuery(
                    queryString, Zdsql.class);
            query.setParameter("filter", "zdlj");

            System.out.println("zdsqls1==");

            zdljs = query.getResultList();

        } catch (Exception re) {
            DBDAO.log("genzdljs() failed", Level.SEVERE, re);
        }
    }


    public void genthszfas() {
        try {

            System.out.println("zdsqls1`1==");

            String queryString = "select m from Zdsql m where m.filter = :filter Order by m.id";
            TypedQuery<Zdsql> query = DBDAO.getEntityManager().createQuery(
                    queryString, Zdsql.class);
            query.setParameter("filter", "thszfas");

            System.out.println("zdsqls12==");

            thszfas = query.getResultList();

        } catch (Exception re) {
            DBDAO.log("genthszfas() failed", Level.SEVERE, re);
        }
    }
}

Answer 1

您没有填充第二个列表。您的构造函数应如下所示：

public ZdsqlBean(){
    this.genzdljs();
    this.genthszfas();  //and not this.getThszfas();
}

Luiggi Mendoza是对的。如果你想避免这样的错误，请使用可理解的名称!!

为什么我不能将值作为{zdsqlBean.thszfas}放在jsf中？

1 个答案: