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ajax – jsf 2.0 Primefaces多个Fileupload不记得上传的文件

发布时间：2020-12-16 03:08:16 所属栏目：百科 来源：网络整理
导读：我已经在这篇文章中解决了一些其他问题(fileuploadhandler正在运行),我的代码如下： 豆： @ManagedBean@ViewScopedpublic class TempBean implements Serializable{ private static final long serialVersionUID = -70753689043016662L; private ListString
我已经在这篇文章中解决了一些其他问题(fileuploadhandler正在运行),我的代码如下：

豆：

@ManagedBean
@ViewScoped
public class TempBean implements Serializable{

    private static final long serialVersionUID = -70753689043016662L;
    private List<String> names; //to remember which files have been uploaded

    public void load(){
        System.out.println("@prerender");
    }

    public TempBean() {
        super();
        System.out.println("@constructor");
        names = new ArrayList<String>();
    }

    @PostConstruct
    public void pc(){
        System.out.println("@postconstruct");
    }

    public void handleFileUpload(FileUploadEvent event) { 
        String filename = event.getFile().getFileName();
        System.out.println("INCOMING FILE: " + filename);
        names.add(filename);

        if(!names.isEmpty()){
            System.out.println("Files uploaded:");
            for(String n : names){
                System.out.println("# " + n);
            }
            System.out.println();
        }
   }  

    public List<String> getNames() {
        return names; 
    }

    public void setNames(List<String> names) {
        this.names = names;
    }

}

XHTML页面：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:ui="http://java.sun.com/jsf/facelets"
        xmlns:p="http://primefaces.org/ui" >

    <h:head> 
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    </h:head>

    <f:event type="preRenderView" listener="#{tempBean.load}" />
    <h:body>

        <h:form>
            <p:fileUpload
                fileUploadListener="#{tempBean.handleFileUpload}"
                mode="advanced" dragDropSupport="true" multiple="true" update=":overview" />
        </h:form>

        <h:panelGroup id="overview">
            <ui:repeat var="file" value="#{tempBean.names}">
                #{file} <br/>
            </ui:repeat>
        </h:panelGroup>

    </h:body>
</html>

我现在面临的问题(或者我打开一个新问题的原因)是,当我上传多个(例如三个)文件时,其中只有一个被附加到空列表中.当我重新上载剩下的两个文件时,再次只将其中一个文件附加到列表中.

有趣的是,为每个文件调用handleFileUpload(…)…

当我同时上传三个文件时,这是我的控制台输出：

@constructor
@postconstruct
@prerender
INCOMING FILE: test1.jpe
INCOMING FILE: test3.jpe
Files uploaded:
INCOMING FILE: test2.jpe
# test3.jpe
-END OF LIST-
Files uploaded:
# test1.jpe
Files uploaded:
# test2.jpe
-END OF LIST-
-END OF LIST-
@prerender
@prerender
@prerender

我该怎么做才能使fileupload-component正常运行？这是一个bug还是一个ajax问题？

这是我的web.xml：

<?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" >

  <display-name>TestProjekt</display-name>
  <welcome-file-list>
    <welcome-file>test.xhtml</welcome-file>
  </welcome-file-list>
  <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>/faces/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
    <servlet-mapping> 
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
        <param-value>resources.application</param-value>
    </context-param>
    <context-param>
        <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>
    <context-param>
        <param-name>facelets.SKIP_COMMENTS</param-name>
        <param-value>true</param-value>
    </context-param>

    <context-param>
        <param-name>primefaces.UPLOADER</param-name>
        <param-value>commons</param-value>
    </context-param>

  <context-param>
    <description>
    This parameter tells MyFaces if javascript code should be allowed in
    the rendered HTML output.
    If javascript is allowed,command_link anchors will have javascript code
    that submits the corresponding form.
    If javascript is not allowed,the state saving info and nested parameters
    will be added as url parameters.
    Default is 'true'</description>
    <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
    <param-value>true</param-value>
  </context-param>

      <context-param> 
        <description> 
        If true,rendered HTML code will be formatted,so that it is 'human-readable'
        i.e. additional line separators and whitespace will be written,that do not
        influence the HTML code.
        Default is 'true'</description>
        <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
        <param-value>true</param-value>
      </context-param>

      <context-param>
        <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
        <param-value>false</param-value>
      </context-param>

      <context-param>
        <description>
        If true,a javascript function will be rendered that is able to restore the
        former vertical scroll on every request. Convenient feature if you have pages
        with long lists and you do not want the browser page to always jump to the top
        if you trigger a link or button action that stays on the same page.
        Default is 'false'
        </description>
        <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
        <param-value>true</param-value>
      </context-param>


    <filter> 
        <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
        <init-param>
            <param-name>uploadDirectory</param-name>
            <param-value>C:tmp</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <servlet-name>Faces Servlet</servlet-name>
    </filter-mapping>

</web-app>

和我的faces.config：

<?xml version="1.0" encoding="UTF-8"?>
<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0"> 

</faces-config>
这是由您的JSF实现MyFaces 2.2.0-20130426中的错误引起的.

当我尝试MyFaces 2.2.0-beta(目前可用于myfaces.apache.org)和Mojarra 2.2.4(目前可用作javaserverfaces.java.net)时,它适用于我.

正如对该问题的评论所证实,它也适用于您.

（编辑：李大同）

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