Java <p:fileUpload> 总是给我空内容

<p:fileUpload> always give me null contents

提问by mohamed abdelbassat

I'm trying to get working like what is documented in the primefaces user guide, and some posts founded there.

我正在尝试像 primefaces 用户指南中记录的那样工作，以及在那里建立的一些帖子。

Upload file in JSF primefaces.

在 JSF primefaces 中上传文件。

the environnement is : javaee full + jpa + jsf 2.2 + primefaces 4 + glassfish v4

环境是：javaee full + jpa + jsf 2.2 + primefaces 4 + glassfish v4

I m posting again, because i have tried every sample and suggestion i have found on the web, without success.

我再次发帖，因为我已经尝试了我在网上找到的所有示例和建议，但都没有成功。

I m able, to get the file uploaded name with : event.getFile.getFileName, but the content is always null

我可以使用：event.getFile.getFileName 获取文件上传名称，但内容始终为空

-------------Updates----------------------------

- - - - - - -更新 - - - - - - - - - - - - - -

My xhtml page :

我的 xhtml 页面：

<h:form enctype="multipart/form-data">

                <p:outputLabel value="La photo :"/>
                <p:fileUpload fileUploadListener="#{personController.upload}"
        mode="advanced" 
        update="messages"
        sizeLimit="100000" 
        allowTypes="/(\.|\/)(gif|jpe?g|png)$/"/>
                <p:growl id="messages" showDetail="true"/>

            </h:form>

my managed bean :

我的托管豆：

@Named(value = "personController")
@SessionScoped
public class PersonController implements Serializable {

    /**
     * Creates a new instance of PersonController
     */
    @Inject
    private PersonneFacade personneService;
    private Personne current;
    private Personne newPerson;
    private List<Personne> personnes;


    public PersonController() {
    }

    public List<Personne> getAll(){
        return personneService.findAll();
    }


    public void upload(FileUploadEvent event) {
        FacesMessage msg = new FacesMessage("Success! ", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
        // Do what you want with the file

        System.out.println(event.getFile().getFileName());
        System.out.println("le fichier " + event.getFile().getContents());
        newPerson.setPhoto(event.getFile().getContents());
    }

my web.xml

我的 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.xhtml</welcome-file>
    </welcome-file-list>

     <!-- ############################################# -->
<!-- # File upload                                      # -->
<!-- ############################################# -->
<filter>
    <filter-name>PrimeFaces FileUpload Filter</filter-name>
    <filter-class>
        org.primefaces.webapp.filter.FileUploadFilter
    </filter-class>

</filter>

<filter-mapping>
    <filter-name>PrimeFaces FileUpload Filter</filter-name>
    <servlet-name>Faces Servlet</servlet-name>
    <dispatcher>FORWARD</dispatcher>
</filter-mapping>


</web-app>

sure i have on my pom.xml :

确定我有我的 pom.xml ：

<dependencies>
        <dependency>  
    <groupId>org.primefaces</groupId>  
    <artifactId>primefaces</artifactId>  
    <version>4.0</version>  
</dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>eclipselink</artifactId>
            <version>2.5.0-SNAPSHOT</version>
            <scope>provided</scope>
        </dependency>

when i m triyng to upload i got on the glassfish output log:

当我尝试上传时，我进入了 glassfish 输出日志：

INFO:   mdmx.jpg
INFO:   le fichier null

any idea about ??

有什么想法吗？

回答by Kishor Prakash

Include Apache-Commons IOand FileuploadAPI's to your app:

将Apache-Commons IO和FileuploadAPI包含到您的应用程序中：

• Commons IO
• Commons Fileupload

• 公共IO
• 共享文件上传

回答by mohamed abdelbassat

I have solved this issue like folowing :

我已经解决了这个问题，如下所示：

The upload worked for me when using : IOUtils.toByteArray(file.getInputstream());

使用时上传对我有用：IOUtils.toByteArray(file.getInputstream());

the environnement is : Java EE 7(JPA, EJB, JSF 2.2.4), Glassfish V4, Primefaces 4

环境是：Java EE 7（JPA、EJB、JSF 2.2.4）、Glassfish V4、Primefaces 4

i give here the complete example, for reusing.

我在这里给出了完整的例子，以供重用。

First : upload.xhtml

第一：upload.xhtml

<h:form enctype="multipart/form-data">
    <p:fileUpload fileUploadListener="#{personController.handleFileUpload}" />
            <p:growl id="messages" showDetail="true"/>
</h:form>

Second : PersonController.java (the jsf managed bean) : package com.sos.fso.grh.controllers;

第二个：PersonController.java（jsf 托管 bean）：包 com.sos.fso.grh.controllers;

import com.sos.fso.grh.entities.Person;
import com.sos.fso.grh.services.PersonFacade;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;
import javax.enterprise.context.SessionScoped;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.inject.Named;
import org.apache.commons.io.IOUtils;
import org.primefaces.event.FileUploadEvent;
import org.primefaces.model.DefaultStreamedContent;
import org.primefaces.model.UploadedFile;

@Named
@SessionScoped
public class PersonController implements Serializable{

@Inject
private PersonFacade personService;

private Person current;
private Person newPerson;
private List<Person> personnes;

public void handleFileUpload(FileUploadEvent event) throws IOException {

    UploadedFile file = event.getFile();
    System.out.println(file.getFileName());

    byte[] foto = IOUtils.toByteArray(file.getInputstream());
    System.out.println(foto);
    newPerson.setPhoto(foto);
 //application code
}

}

Third : the web.xml

第三个：web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>bootstrap</param-value>
    </context-param>
         <context-param>   
 <param-name>primefaces.UPLOADER</param-name>   
 <param-value>auto</param-value>
</context-param>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.xhtml</welcome-file>
    </welcome-file-list>
        </web-app>

if you have an entity bean "person" for example with a @Lob binary attribute, you can fill it with the byte data. to save the image (or file if you need).

如果您有一个实体 bean “person”，例如带有 @Lob 二进制属性，您可以用字节数据填充它。保存图像（或文件，如果需要）。

to restore it on a

将其恢复到

the view.xhtml

视图.xhtml

    <!DOCTYPE html>
<html xmlns="http://www.w3c.org/1999/xhtml"   
 xmlns:h="http://java.sun.com/jsf/html"   
 xmlns:p="http://primefaces.org/ui">
<h:head>
</h:head>
<h:body>
    <h:form>
    #{personController.current.FName}

        <p:panelGrid columns="2">
        <p:outputLabel value="Nom :"/>
        <h:outputText value="#{personController.current.FName}" />

        <p:outputLabel value="Prénom :"/>
        <h:outputText value="#{personController.current.LName}" />

        <p:outputLabel value="Date de naissance :"/>
        <h:outputText value="#{personController.current.birthDate}" />

        <p:outputLabel value="photo :"/>
        <p:graphicImage value="#{personController.byteToImage(personController.current.photo)}" />
        </p:panelGrid>
        <p:commandLink value="retour a la liste" action="#{personController.showList}"/>
        </h:form>

</h:body>
</html>

and the PersonController Method to restore the image (This code is of BalusC from stackOverFlow )

以及恢复图像的 PersonController 方法（此代码来自 stackOverFlow 的 BalusC ）

public DefaultStreamedContent byteToImage(byte[] imgBytes) throws IOException {
ByteArrayInputStream img = new ByteArrayInputStream(imgBytes);
return new DefaultStreamedContent(img,"image/jpg");
}

thanks for everyone helped me.

谢谢大家帮助我。

thanks again

再次感谢