primefaces自动完成与POJO

本文介绍了primefaces自动完成与POJO的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我读了关于SO同一组件一些QA，但我觉得我失去了一些东西，因为我是一步落后。
使用primefaces它自动完成组件时，我甚至不能使页面打开。
它的片段是：

 ＆LT;电话号码：自动完成值=＃{} indirizzoCtrl.selectedCodiceNazione
            completeMethod =＃{} indirizzoCtrl.completeNazione
            VAR =nazioneitemLabel =＃{} nazione.nome
            itemValue =＃{} nazione.codiceNazione/＆GT;

Nazione是一个POJO类，其中 CodiceNazione 和诺姆是两个String字段（getter和setter肯定）。 completeNazione 是返回上ManagedBean的方法列表与LT; Nazione＆GT; 。
看着这里 BalusC解释，在我看来，我不需要任何涉及转换器，因为这两个itemValue和价值属性映射到字符串属性。
无论如何，当我刚刚打开包含这个自动完成内容的网页，它与此错误崩溃：

  javax.el.PropertyNotFoundException：/Cliente/Indirizzo.xhtml @ 23,56 itemValue =＃{} nazione.codiceNazione：itemValue =＃{} nazione.codiceNazione：住宅'codiceNazione在java.lang.String类型未找到

为什么发生这种情况？我真的无法得到它。该方法completeNazione甚至没有叫呢，所以它不应该知道任何 Nazione 呢。
这有什么错呢？

编辑：的
继建议，我试图添加一个转换器，但我仍然得到同样的错误。
这里是我的转换器：

 公共类NazioneConverter实现转换器{    最终静态记录器记录= Logger.getLogger（NazioneConverter.class）;    @覆盖
    公共对象的getAsObject（FacesContext的上下文，UIComponent组件，字符串值）{
        如果（value.trim（）。等于（））{
            返回null;
        }其他{
            尝试{
                IndirizzoRepository IR =新IndirizzoRepository（）;
                清单＆LT; Nazione＆GT; Nazioni酒店= ir.getNazioneByName（值）;
                如果（nazioni.size（）== 1）返回nazioni.get（0）;
                否则抛出新的异常（）;            }赶上（例外五）{
                弦乐味精=Errore迪转换器类;
                log.error（味精，E）;
                抛出新的ConverterException（新的FacesMessage（FacesMessage.SEVERITY_ERROR，味精，非戊UNA nazione conosciuta））;
            }
        }
    }    @覆盖
    公共字符串符getAsString（FacesContext的上下文，UIComponent组件，对象的值）{
        如果（价值== NULL || value.equals（））{
            返回;
        }其他{
            返回将String.valueOf（（（Nazione）值）.getNome（））;
        }
    }}

现在在视图组件如下：

 ＆LT;电话号码：自动完成值=＃{} indirizzoCtrl.indirizzo.nazione.codiceNazione
            completeMethod =＃{} indirizzoCtrl.completeNazione
            VAR =nazioneitemLabel =＃{} nazione.nome转换器=＃{} nazioneConverter
            itemValue =＃{} nazione.codiceNazioneforceSelection =真/＆GT;

但仍然没有工作。该转换器甚至没有调用：我注册在我的faces-config.xml文件。
我也试过itemValue =＃{} nazione作为primefaces展示，但问题成为了 ItemLabel 属性，映射到 nazione.nome 。
我在做什么错了？

解决方案

这为我工作：

  //转换器
@FacesConverter（值=MarcaConverter）
公共类MarcaConverter实现转换器{
    MarcaDAO marcaDAO;
    公共对象的getAsObject（FacesContext的contet，UIComponent组件，字符串值）{
        如果（价值== NULL || value.equals（））
            返回null;
        尝试{
            INT ID =的Integer.parseInt（值）;
            返回marcaDAO.findMarcaById（ID）;
        }赶上（例外五）{
            e.printStackTrace（）;
            抛出新的ConverterException（新的FacesMessage（FacesMessage.SEVERITY_ERROR，马卡报没有válida，））;
        }
    }    公共字符串符getAsString（FacesContext的contet，UIComponent组件，对象的值）{
        如果（价值== NULL || value.equals（））
            返回null;
        返回将String.valueOf（（（马卡）值）.getCodigoMarca（））;
    }
}
// --------------------------------------
//豆
@ManagedBean
@ViewScoped
公共类MyBeans实现Serializable {
    私人马卡报马卡报;
    ...
    公共马卡getMarca（）{
        返回马尔卡;
    }
    公共无效setMarca（马卡米）{
        马卡报=米;
    }
    ...
    公开名单＆LT;＆马卡GT; obtenerMarcasVehiculos（String s）将{
        清单＆LT;＆马卡GT; MARCAS，smarcas =新的ArrayList＆LT;＆马卡GT;（）;
        尝试{
            MARCAS = marcaDAO.findAllMarcas（）;
            如果（s.trim（）等于（）。）返回MARCAS;
            对于（马卡玛：MARCAS）
                如果（m.getNombreMarca（）。的toString（）。含有（S）|| m.getNombreMarca（）。与toLowerCase（）。包括（s.toLowerCase（）））{
                    smarcas.add（米）;
                }
            返回smarcas;
        }赶上（例外五）{
            //JsfUtil.showFacesMsg(e,\"Error人obtener拉斯MARCAS德辆＆放大器; iacute; culos，，FacesMessage.SEVERITY_WARN）;
            e.printStackTrace（）;
            JsfUtil.lanzarException（E）;
            返回null;
        }
    }
// -----------------------------------------
//*.xhtml页
...
    ＆LT;电话号码：自动完成
       ID =cbxMarcaVALUE =＃{} myBean.marca大小=40
       转换器=MarcaConverter
       completeMethod =＃{} myBean.obtenerMarcasVehiculos
       VAR =MitemLabel =＃{} m.nombreMarcaitemValue =＃{m}这样
       forceSelection =真下拉菜单=真
       所需=真scrollHeight属性=200＆GT;
    ＆LT; / P：自动完成＆GT;
...// -----------------------------------------
//类马卡报
公共类马卡实现Serializable {
       私有静态最后的serialVersionUID长1L =;    私人整数codigoMarca;
    私人字符串nombreMarca;
        ...

I read on SO some QA about the same component, but I feel I'm missing something, because I am one step behind.I can't even make the page open when using the primefaces autocomplete component in it.The snippet for it is:

<p:autoComplete value="#{indirizzoCtrl.selectedCodiceNazione}"
            completeMethod="#{indirizzoCtrl.completeNazione}"
            var="nazione" itemLabel="#{nazione.nome}"
            itemValue="#{nazione.codiceNazione}" />

Nazione is a Pojo class where CodiceNazione and Nome are two String field (with getter and setter for sure). completeNazione is a method on the ManagedBean that returns List<Nazione>.Looking at BalusC explanation here, it seems to me that i don't need any converter involved, because both itemValue and value attributes are mapped to string property.Anyway, when I just open the page containing this autocomplete snippet, it crashes with this error:

javax.el.PropertyNotFoundException: /Cliente/Indirizzo.xhtml @23,56 itemValue="#{nazione.codiceNazione}": itemValue="#{nazione.codiceNazione}": Property 'codiceNazione' not found on type java.lang.String

Why this is happening? I really can't get it. The method completeNazione hasn't even called yet, so it shouldn't know any Nazione yet.What's wrong with it?

Edited:Following the suggestion, I tried to add a converter, but I still get the same error.Here's my converter:

    public class NazioneConverter implements Converter {

    final static Logger log = Logger.getLogger(NazioneConverter.class);

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        if (value.trim().equals("")) {
            return null;
        } else {
            try {
                IndirizzoRepository ir = new IndirizzoRepository();
                List<Nazione> nazioni = ir.getNazioneByName(value);
                if (nazioni.size()==1) return nazioni.get(0);
                else throw new Exception();

            } catch (Exception e) {
                String msg = "Errore di conversione";
                log.error(msg, e);
                throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, "Non è una nazione conosciuta"));
            }
        }
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
        if (value == null || value.equals("")) {
            return "";
        } else {
            return String.valueOf(((Nazione) value).getNome());
        }
    }

}

now the component in the view looks like:

<p:autoComplete value="#{indirizzoCtrl.indirizzo.nazione.codiceNazione}"
            completeMethod="#{indirizzoCtrl.completeNazione}"
            var="nazione" itemLabel="#{nazione.nome}" converter="#{nazioneConverter}"
            itemValue="#{nazione.codiceNazione}" forceSelection="true"  />

But still don't working. The converter is not even invoked: I registered it in my faces-config.xml file.I also tried itemValue="#{nazione}" as in the primefaces showcase but the problem became the ItemLabel attribute, mapped to nazione.nome.What am I doing wrong?

解决方案

This worked for me:

//Converter
@FacesConverter(value="MarcaConverter")
public class MarcaConverter implements Converter{
    MarcaDAO marcaDAO;
    public Object getAsObject(FacesContext contet, UIComponent component, String value) {
        if(value==null || value.equals(""))
            return null;
        try{
            int id = Integer.parseInt(value);
            return marcaDAO.findMarcaById(id);
        }catch (Exception e) {
            e.printStackTrace();
            throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Marca no válida", ""));
        }
    }

    public String getAsString(FacesContext contet, UIComponent component, Object value) {
        if(value==null || value.equals(""))
            return null;
        return String.valueOf(((Marca)value).getCodigoMarca());
    }
}




//--------------------------------------
//Bean
@ManagedBean
@ViewScoped
public class MyBeans implements Serializable{
    private Marca marca;
    ...
    public Marca getMarca(){
        return marca;
    }
    public void setMarca(Marca m){
        marca=m;
    }
    ...
    public List<Marca> obtenerMarcasVehiculos(String s) {
        List<Marca> marcas,smarcas=new ArrayList<Marca>();
        try{
            marcas= marcaDAO.findAllMarcas();
            if(s.trim().equals("")) return marcas;
            for(Marca m:marcas)
                if (m.getNombreMarca().toString().contains(s) || m.getNombreMarca().toLowerCase().contains(s.toLowerCase())) {
                    smarcas.add(m);
                }
            return smarcas;
        }catch(Exception e){
            //JsfUtil.showFacesMsg(e,"Error al obtener las marcas de veh&iacute;culos","",FacesMessage.SEVERITY_WARN);
            e.printStackTrace();
            JsfUtil.lanzarException(e);
            return null;
        }
    }


//-----------------------------------------
//*.xhtml page
...
    <p:autoComplete
       id="cbxMarca" value="#{myBean.marca}" size="40"
       converter="MarcaConverter"
       completeMethod="#{myBean.obtenerMarcasVehiculos}"
       var="m" itemLabel="#{m.nombreMarca}" itemValue="#{m}"
       forceSelection="true" dropdown="true"
       required="true" scrollHeight="200">
    </p:autoComplete>
...

//-----------------------------------------
//Class Marca
public class Marca implements Serializable{
       private static final long serialVersionUID = 1L;

    private Integer codigoMarca;
    private String nombreMarca;
        ...

这篇关于primefaces自动完成与POJO的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！