[英]CDI params in @PostConstruct
我认为我的问题与此类似,但尚未发现它可行
<f:metadata>
<f:viewParam id="id" name="id" value="#{detailsBean.id}"/>
</f:metadata>
为什么我不能用@Named执行此操作并使用CDI:
@Named
@RequestScoped
public class DetailsBean {
private Contacts detailsContact;
@EJB
ContactsFacade contactsEJB;
private int id;
public DetailsBean() {
System.out.println("details bean called");
}
@PostConstruct
public void onLoad() {
detailsContact = contactsEJB.find(id);
}
我无法记录身份证。
当然,@ ManagedProperty与CDI不兼容。
***** UPDATE *****
一些xhtml:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns:ui="http://java.sun.com/jsf/facelets"
template="../template.xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.prime.com.tr/ui"
xmlns:f="http://java.sun.com/jsf/core">
<ui:define name="head">
<f:metadata>
<f:viewParam name="paginator" value="#{contactsBean.contactsTablePaginator}"/>
<f:viewParam name="rows" value="#{contactsBean.contactsTableRows}"/>
</f:metadata>
</ui:define>
<ui:define name="content">
<p:growl id="growl" showDetail="true"/>
<p:panel id="contactsPanel" >
<h:form id ="contactsForm">
<p:dataTable id="contactsTable" value="#{contactsBean.contacts}" selection="#{detailsBean.detailsContact}" var="contacts" widgetVar="contactsTable"
selectionMode="single" rowSelectListener="#{contactsBean.rowSelect}" rowUnselectListener="#{contactsBean.rowUnSelect}"
onRowUnselectUpdate="detailsForm" onRowSelectUpdate="detailsForm"
paginator="#{contactsBean.contactsTablePaginator}" rows="#{contactsBean.contactsTableRows}" rowsPerPageTemplate="5,10,15,25,50,100"
paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}">
<f:facet name="header">
<p:outputPanel>
<h:outputText value="Search:" />
<p:inputText id="globalFilter" onkeyup="contactsTable.filter()" style="width:150px" />
</p:outputPanel>
</f:facet>
<p:column filterStyle="display:none" filterBy="#{contacts.name}" headerText="Name" style="width:200px">
<h:outputText value="#{contacts.name}" />
</p:column>
<p:column filterStyle="display:none" filterBy="#{contacts.street}" headerText="Street" style="width:280px">
<h:outputText value="#{contacts.street}" />
</p:column>
<p:column filterStyle="display:none" filterBy="#{contacts.city}" headerText="City" style="width:150px">
<h:outputText value="#{contacts.city}" />
</p:column>
<p:column filterStyle="display:none" filterBy="#{contacts.state}" headerText="State" style="width:50px">
<h:outputText value="#{contacts.state}" />
</p:column>
<p:column filterStyle="display:none" filterBy="#{contacts.zip}" headerText="Zip" style="width:100px">
<h:outputText value="#{contacts.zip}" />
</p:column>
<p:column filterStyle="display:none" filterBy="#{contacts.country}" headerText="Country" style="width:150px">
<h:outputText value="#{contacts.country}" />
</p:column>
<p:column filterStyle="display:none" filterBy="#{contacts.sent}" headerText="Sent" style="width:50px">
<h:outputText value="#{contacts.sent}" />
</p:column>
</p:dataTable>
<p:ajaxStatus >
<f:facet name="start">
<h:graphicImage value="../resources/images/ajax-loader-bar.gif" />
</f:facet>
<f:facet name="complete">
<h:graphicImage value="../resources/images/ajax-loader-bar-still.gif" />
</f:facet>
<f:facet name="default">
<h:graphicImage value="../resources/images/ajax-loader-bar-still.gif" />
</f:facet>
</p:ajaxStatus>
<br />
<p:commandLink value="View All" action="#{contactsBean.viewAll}" />
<p:commandLink value="Default View" action="#{contactsBean.viewDefault}" />
<p:commandLink value="Advanced Search" action="search?faces-redirect=true" />
<br />
</h:form>
<br />
</p:panel>
<br />
<br />
<h:form id="detailsForm">
<p:panel id="detailsPanel" visible="#{detailsBean.visible}" >
<h:panelGrid id="detailsPanelGrid" cellpadding="2" cellspacing="2" columns="3" >
<h:outputText value="Name :" />
<p:inputText id="name" value="#{detailsBean.detailsContact.name}" style="width:400px" />
<p:message for="name" />
<h:outputText value="Email :" />
<p:inputText id="email" value="#{detailsBean.detailsContact.email}" style="width:400px" validatorMessage="Must be a valid email address. EX: test@test.com" >
<f:validateRegex pattern="[a-zA-Z0-9]+@[a-zA-Z0-9]+\.[a-zA-Z0-9]+"/>
<p:ajax event="blur" update="emailMsg" />
</p:inputText>
<p:message id="emailMsg" for="email" />
<h:outputText value="Street :" />
<p:inputText id="street" value="#{detailsBean.detailsContact.street}" style="width:400px" />
<p:message for="street" />
<h:outputText value="City :" />
<p:inputText id="city" value="#{detailsBean.detailsContact.city}" style="width:400px" />
<p:message for="city" />
<h:outputText value="State :" />
<p:inputText id="state" value="#{detailsBean.detailsContact.state}" style="width:400px" validatorMessage="Length is greater than 2" >
<f:validateLength maximum="2" />
<p:ajax event="blur" update="stateMsg" />
</p:inputText>
<p:message id="stateMsg" for="state" />
<h:outputText value="Country :" />
<p:inputText id="country" value="#{detailsBean.detailsContact.country}" style="width:400px" />
<p:message for="country" />
<h:outputText value="Phone :" />
<p:inputText id="phone" value="#{detailsBean.detailsContact.phone}" style="width:400px"/>
<p:message for="phone" />
<h:outputText value="Guests :" />
<p:inputText id="guests" value="#{detailsBean.detailsContact.guests}" style="width:400px"/>
<p:message for="guests" />
<h:outputText value="Arrival :" />
<p:calendar id="arrival" value="#{detailsBean.detailsContact.arrival}" showOn="button" />
<p:message for="arrival" />
<h:outputText value="Departure :" />
<p:calendar id="departure" value="#{detailsBean.detailsContact.departure}" showOn="button" />
<p:message for="departure" />
<h:outputText value="Message :" />
<p:inputTextarea id="message" effectDuration="30" style="width:400px;height:100px;" value="#{detailsBean.detailsContact.message}" />
<p:message for="message" />
<h:outputText value="Departure :" />
<p:calendar id="inserted" value="#{detailsBean.detailsContact.inserted}" showOn="button"/>
<p:message for="inserted" />
<h:outputText value="Sent :" />
<h:selectBooleanCheckbox id="sent" value="#{detailsBean.detailsContact.sent}" />
<p:message for="sent" />
<br />
</h:panelGrid>
<p:commandButton value="Submit" action="#{detailsBean.updateContactDetails}" update="contactsForm, growl, stateMsg" />
<p:commandButton value="Close" action="#{detailsBean.handleClose}" update="contactsForm, detailsForm" />
</p:panel>
</h:form>
</ui:define>
</ui:composition>
更多java代码:
package com.atlanticpkg.view.beans;
import com.atlanticpkg.model.entities.Contacts;
import com.atlanticpkg.util.FacesUtils;
import java.io.Serializable;
import javax.annotation.PostConstruct;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
@Named(value = "detailsBean")
@RequestScoped
public class EditBean {
private Contacts detailsContact;
private boolean visible = false;
@Inject
ContactsBean contactsBean;
public EditBean() {
}
@PostConstruct
public void onLoad() {
}
public void handleClose() {
this.setVisible(false);
this.setDetailsContact(new Contacts());
}
public void updateContactDetails() {
try {
contactsBean.getContactsEJB().edit(detailsContact);
FacesUtils.addMessage(detailsContact.getName() + " was updated successfully!");
} catch (Exception e) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERROR", e.toString()));
}
}
}
甚至更多:
@Named(value = "contactsBean")
@RequestScoped
public class ContactsBean {
@Inject
EditBean editBean;
@EJB
private ContactsFacade contactsEJB;
private List<Contacts> contacts = new ArrayList<Contacts>();
private boolean contactsTablePaginator = true;
private int contactsTableRows = 10;
private Contacts selectedContact = new Contacts();
public ContactsBean() {
}
@PostConstruct
public void onLoad() {
updateContactsList();
}
public String viewDefault() {
contactsTablePaginator = true;
contactsTableRows = 10;
return "index?faces-redirect=true&includeViewParams=true";
}
public String viewAll() {
contactsTablePaginator = false;
contactsTableRows = 100;
return "index?faces-redirect=true&includeViewParams=true";
}
public void updateContactsList() {
contacts.clear();
contacts = contactsEJB.findAll();
}
public void rowSelect(SelectEvent event) {
editBean.setVisible(true);
editBean.setDetailsContact((Contacts) event.getObject());
}
public void rowUnSelect(UnselectEvent event) {
editBean.setVisible(false);
editBean.setDetailsContact(new Contacts());
}
}
inputText框填充得很好。 但是当我点击提交时,它表示值为空。 此代码与SessionScope完美配合。
警告:/admin/index.xhtml @ 104,109 value =“#{detailsBean.detailsContact.name}”:目标无法访问,'null'返回null javax.el.PropertyNotFoundException:/admin/index.xhtml @ 104,109 value =“#{ detailsBean.detailsContact.name}“:目标无法访问,'null'返回null
我可以看到它在选择数据表时调用EditBean。 然后,当我单击提交按钮时,它再次调用它。
我遇到了与你完全相同的问题,并通过使用外部上下文(包含GET参数)而不是f:viewParam
来解决它。
在@PostConstruct
方法中,只需使用类似的方法获取参数
FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();
生命周期不允许您的方法。
首先,创建bean(构造函数)。 之后,执行依赖注入,然后是@PostConstruct
方法,然后评估JSF文件。 viewParam
在该文件中。 因此,您必须注册另一个在填充视图参数后调用的侦听器。
我有一个@RequestScope
bean的解决方案,但如果bean的范围更长(如View),则在每个请求(包括AJAX)之后执行此方法,这可能是不可取的。
将此用于请求范围bean:
<f:metadata>
<f:viewParam id="id" name="id" value="#{detailsBean.id}"/>
<f:event type="preRenderView" listener="#{detailsBean.onLoad}" />
</f:metadata>
对于@ViewScope
bean,我使用的是“hack”,但它可能不是最佳实践。 它做同样的事情,但可能它不是正确的方法。
#{detailsBean.onLoad()}
<f:metadata>
<f:viewParam id="id" name="id" value="#{detailsBean.id}"/>
</f:metadata>
我希望这对你有所帮助。
编辑:
你在这里使用了很多AJAX。 这些调用必须至少ViewScoped
bean。 View Scope与RequestScope
类似,但它需要更长的时间 - 直到页面被留下。
但我还没有完全阅读,有很多代码,如果ViewScope没有帮助,那么也许你应该提供一小段有问题的代码,以便有机会找到并专注于真正的问题。
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