我在使用Primefaces 2.2.1 + Hibernate的JBoss AS 6上使用Mojarra 2.0.3。
我有一个带有p：datatable和p：对话框的主 - 详细信息 - 视图，用于Person（prename，lastname）。
Person.java代码：
@Entity
public class Person implements Serializable {
private static final long serialVersionUID = 279906432340876832L;
@Id
@GeneratedValue(strategy = javax.persistence.GenerationType.AUTO)
private Long id;
private String prename;
private String lastname;
// getter and setter...
}
使用“创建”按钮可以创建一个新实例，通过“编辑”按钮，可以编辑所选项目。
.xhtml代码：
<h:form id="personForm">
<!-- 2 Buttons to open create/edit Dialog -->
<p:panel id="tableButtons">
<p:commandButton value="create" action="#{personBean.showCreateView}"
update="personForm:detailPanel" oncomplete="personDialog.show()" />
<p:commandButton value="edit" action="#{personBean.showEditView}"
update="personForm:detailPanel" oncomplete="personDialog.show()"
rendered="#{personBean.rowSelected}" />
</p:panel>
<!-- DataTable for list-View -->
<p:dataTable var="item" styleClass="table"
value="#{personBean.personList}" id="personTable" paginator="true"
selectionMode="single" selection="#{personBean.selectedPerson}"
rowSelectListener="#{personBean.select}"
onRowSelectUpdate="personForm:tableButtons"
rowUnselectListener="#{personBean.unselect}"
onRowUnselectUpdate="personForm:tableButtons" rows="10">
<p:column sortBy="#{item.prename}">
<f:facet name="header">
<h:outputText value="prename" />
</f:facet>
<h:outputText value="#{item.prename}" />
</p:column>
<p:column sortBy="#{item.lastname}">
<f:facet name="header">
<h:outputText value="lastname" />
</f:facet>
<h:outputText value="#{item.lastname}" />
</p:column>
</p:dataTable>
<!-- Dialog for detailed-View -->
<p:dialog id="personDialog" widgetVar="personDialog">
<p:panel id="detailPanel">
<h:panelGrid cellpadding="4">
<h:outputText value="prename: " />
<h:inputText value="#{personBean.selectedPerson.prename}" />
<h:outputText value="lastname: " />
<h:inputText value="#{personBean.selectedPerson.lastname}" />
</h:panelGrid>
<p:commandButton value="persist"
actionListener="#{personBean.persist}"
rendered="#{personBean.createView}" update="personForm"
oncomplete="personDialog.hide()" />
<p:commandButton value="save" actionListener="#{personBean.merge}"
update="personForm" rendered="#{personBean.editView}"
oncomplete="personDialog.hide()" />
</p:panel>
</p:dialog>
</h:form>
managedBean包含2个布尔属性createView / editView，它们出现在对话框命令按钮的render-attribute中，一个是DataTable的List，另一个是用于Detail-View的“selectedPerson”，另一个是在行的情况下触发edit-Button的布尔值在DataTable中进行选择。
Managed-Bean代码：
@ManagedBean(name = "personBean")
@ViewScoped
public class PersonMBean {
private List<Person> personList;
private Person selectedPerson;
// row in the table has been selected
private boolean rowSelected;
// only render the active View
private boolean createView;
private boolean editView;
// ... displayView and more possible
@EJB
private CRUDService crudService;
public PersonMBean() {
personList = new ArrayList<Person>();
selectedPerson = new Person();
}
// CRUD-options
public String persist(ActionEvent actionEvent) {
crudService.persist(selectedPerson);
return null;
}
public String merge(ActionEvent actionEvent) {
selectedPerson = crudService.merge(selectedPerson);
return null;
}
// switch between Views
public String showCreateView() {
selectedPerson = new Person();
createView = true;
editView = false;
return null;
}
public String showEditView() {
createView = false;
editView = true;
return null;
}
public List<Person> getPersonList() {
return crudService.getAllPerson();
}
public Person getSelectedPerson() {
if (selectedPerson == null) {
selectedPerson = new Person();
}
return selectedPerson;
}
public String select(SelectEvent event) {
setRowSelected(true);
return null;
}
public String unselect(UnselectEvent event) {
setRowSelected(false);
return null;
}
// getter + setter
public void setPersonList(List<Person> personList) {this.personList = personList;}
public void setSelectedPerson(Person selectedPerson) {this.selectedPerson = selectedPerson;}
public boolean isRowSelected() {return rowSelected;}
public void setRowSelected(boolean rowSelected) {this.rowSelected = rowSelected;}
public void setCreateView(boolean createView) {this.createView = createView;}
public boolean isCreateView() {return createView;}
public void setEditView(boolean editView) {this.editView = editView;}
public boolean isEditView() {return editView;}
}
问题在于，虽然单个创建/编辑Person是成功的，但在此之后，create-Action会插入一个空行，而edit-Action会插入一个具有错误值的行。当我重新加载页面时，第一个动作再次正常，第二个动作失败...... :(
我认为PersonMBean.selectedPerson有一个过时的状态，但我无法弄明白，也无法找到解决方案。
P.S。 crudService只调用em.persist + em.merge
CRUDService代码：
@Stateless
public class CRUDService {
@PersistenceContext
EntityManager em;
public <T> T persist(T t) {
this.em.persist(t);
return t;
}
public <T> T merge(T t) {
return this.em.merge(t);
}
@SuppressWarnings("unchecked")
public List<Person> getAllPerson() {
Query q = em.createQuery("from Person");
return q.getResultList();
}
}
web.xml如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID"
version="3.0">
<context-param>
<param-name>javax.faces.PARTIAL_STATE_SAVING</param-name>
<param-value>false</param-value>
</context-param>
<servlet>
<servlet-name>facesServlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>facesServlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
</web-app>
我真的很挣这个，希望你能帮助我。
如果格式/样式有任何问题，请告诉我，以便我可以更新。
答案 0 :(得分：1)
查看http://www.jaxio.com/en/celerio.html它输出可用作示例的JSF + Primefaces主/详细页面
答案 1 :(得分：0)
您可以将它添加到您的web.xml然后重新运行代码吗？
<context-param>
<param-name>javax.faces.PARTIAL_STATE_SAVING</param-name>
<param-value>false</param-value>