我正在尝试<p:cellEditor>使用<p:fileUpload>. 当我尝试上传文件时，它以null. 这是如何引起的，我该如何解决？
我正在使用 PrimeFaces 3.5 和 JSF 2.0。
这是视图：
<p:dataTable id="question" var="question" value="#{editor.questions}" editable="true" widgetVar="carsTable" resizableColumns="true">
<f:facet name="header">Economic</f:facet>
<p:ajax event="rowEdit" listener="#{editor.onEdit}" />
<p:ajax event="rowToggle" listener="#{editor.onRowToggle}" />
<p:column style="width:6%">
<p:rowEditor />
</p:column>
<p:column style="width:2%">
<p:rowToggler />
</p:column>
<p:column headerText="Performance Indicator" style="width:25%">
<h:outputText value="#{question.performanceIndicator}" title="#{question.performanceIndicator}"/>
</p:column>
<p:column headerText="Description" style="heigh:200px;width:200px">
<h:outputText value="#{question.description}" />
</p:column>
<p:column headerText="CSR Label" style="width:25%">
<h:outputText value="#{question.csrLabel}" />
</p:column>
<p:column headerText="Response" style="width:25%">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{question.response}" />
</f:facet>
<f:facet name="input">
<h:selectOneMenu value="#{question.response}" style="width:100%">
<f:selectItem value="#{tableBean.manufacturers}" itemLabel="Yes" itemValue="Y" />
<f:selectItem value="#{tableBean.manufacturers}" itemLabel="No" itemValue="N" />
<f:selectItem value="#{tableBean.manufacturers}" itemLabel="Partial" itemValue="P" />
</h:selectOneMenu>
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="File" style="width:25%">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{question.file.fileName}" />
</f:facet>
<f:facet name="input">
<p:fileUpload value="#{question.file}" mode="simple"/>
</f:facet>
</p:cellEditor>
</p:column>
<p:rowExpansion>
<h:panelGrid id="display" columns="2">
<h:outputText id="model" value="#{question.description}" />
</h:panelGrid>
</p:rowExpansion>
</p:dataTable>
更新：是的，它在一个<h:form>.
这是支持bean：
package org.zicon.web.jsf;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import org.primefaces.event.CellEditEvent;
import org.primefaces.event.FlowEvent;
import org.primefaces.event.RowEditEvent;
import org.primefaces.event.ToggleEvent;
import org.primefaces.model.UploadedFile;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.zicon.domain.GRI;
import org.zicon.domain.User;
@ManagedBean(name="userWizard")
@RequestScoped
public class UserWizard {
private List<GRI> questions;
private User user = new User();
private boolean skip;
private String effect = "fade";
private static Logger logger = Logger.getLogger(UserWizard.class.getName());
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public void save(ActionEvent actionEvent) {
//Persist user
for(GRI gri:questions)
{
System.out.println("Response"+gri.getResponse());
System.out.println("File Name"+gri.getFile().getFileName());
}
FacesMessage msg = new FacesMessage("Successful", "Welcome :" + user.getFirstname());
FacesContext.getCurrentInstance().addMessage(null, msg);
}
public String getEffect() {
return effect;
}
public void setEffect(String effect) {
this.effect = effect;
}
public boolean isSkip() {
return skip;
}
public void setSkip(boolean skip) {
this.skip = skip;
}
public String onFlowProcess(FlowEvent event) {
logger.info("Current wizard step:" + event.getOldStep());
logger.info("Next step:" + event.getNewStep());
if(skip)
return "confirm";
else
return event.getNewStep();
}
public UserWizard() {
questions=new ArrayList<GRI>();
GRI gri=new GRI();
gri.setPerformanceIndicator("EC1");
gri.setDescription("Direct economic value generated and distributed, including " +
"revenues, operating costs, employee compensation, donations and other community investments, " +
"retained earnings, and payments to capital providers and governments.");
gri.setCsrLabel("3.1");
questions.add(gri);
GRI gri1=new GRI();
gri1.setPerformanceIndicator("EC2");
gri1.setDescription("Financial implications and other risks and opportunities for the organization's activities due to climate change" );
questions.add(gri1);
GRI gri2=new GRI();
gri2.setPerformanceIndicator("EC1");
gri2.setDescription("Direct economic value generated and distributed, including " +
"revenues, operating costs, employee compensation, donations and other community investments, " +
"retained earnings, and payments to capital providers and governments.");
gri2.setCsrLabel("3.1");
questions.add(gri2);
GRI gri3=new GRI();
gri3.setPerformanceIndicator("EC3");
gri3.setDescription("Coverage of the organization's defined benefit plan obligations. ");
questions.add(gri3);
GRI gri4=new GRI();
gri4.setPerformanceIndicator("EC4");
gri4.setDescription("Significant financial assistance received from government. ");
questions.add(gri4);
GRI gri5=new GRI();
gri5.setPerformanceIndicator("EC5");
gri5.setDescription("Range of ratios of standard entry level wage compared to local minimum wage at significant" +
" locations of operation.");
gri5.setCsrLabel("1.2");
questions.add(gri5);
}
public void onCellEdit(CellEditEvent event) {
Object oldValue = event.getOldValue();
Object newValue = event.getNewValue();
if(newValue != null && !newValue.equals(oldValue)) {
FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO, "Cell Changed", "Old: " + oldValue + ", New:" + newValue);
FacesContext.getCurrentInstance().addMessage(null, msg);
}
}
public List<GRI> getQuestions() {
return questions;
}
public void setQuestions(List<GRI> questions) {
this.questions = questions;
}
public void onRowToggle(ToggleEvent event) {
FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO,
"Row State " + event.getVisibility(),
"Model:" );
FacesContext.getCurrentInstance().addMessage(null, msg);
}
public void onEdit(RowEditEvent event) {
FacesMessage msg = new FacesMessage("Question Edited", ((GRI) event.getObject()).getResponse());
GRI gri=((GRI) event.getObject());
FacesContext.getCurrentInstance().addMessage(null, msg);
}
private UploadedFile file;
public UploadedFile getFile() {
return file;
}
public void setFile(UploadedFile file) {
this.file = file;
}
public void upload() {
if(file != null) {
FacesMessage msg = new FacesMessage("Succesful", file.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, msg);
}
}
}