我已经在本文中解决了其他一些问题（fileuploadhandler现在正在工作），其中我的代码如下：
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（或我提出一个新问题的原因）是，当我上传多个（例如三个）文件时，只有其中一个被追加到空列表中。当我重新上传剩余的两个文件时，再次，只有其中一个附加到列表中。
有趣的是为每个文件都调用handleFileUpload（…）。
当我同时上传三个文件时，这是控制台输出：
@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
如何使fileupload-component正常运行？这是bug还是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JSF实现MyFaces 2.2.0-20130426中的错误引起的。
当我尝试使用MyFaces 2.2.0-beta（目前可在myfaces.apache.org上使用）和Mojarra 2.2.4（目前可通过javaserverfaces.java.net上使用）时，它对我有用。
正如对问题的评论所证实的，它也可以为您服务。
