亲爱的Stackoverflow社区，
这个问题与以下problem described几乎相同。区别在于我已经更新了我的JSF实现，但我仍然得到了相同的行为。在我的情况下，可能导致列表的原因是不保留以前上传的名称？
我正在使用PrimeFaces 5.2社区版，Glassfish4和Mojarra 2.2.12在创建此问题时最新版本的2.2.x分支。
2015-08-08T20:41:42.748-0400|INFO: Initializing Mojarra 2.2.12 ( 20150720-0848 https://svn.java.net/svn/mojarra~svn/tags/2.2.12@14885) for context '/Pack_Encrypt'
2015-08-08T20:41:44.630-0400|INFO: Monitoring jndi:/server/Pack_Encrypt/WEB-INF/faces-config.xml for modifications
2015-08-08T20:41:44.666-0400|INFO: Running on PrimeFaces 5.2
如果可以的话，我想向您展示我的配置文件和我的代码。
@ManagedBean
@ViewScoped
public class FileMultipleBean implements Serializable {
private static final long serialVersionUID = 1672580425686966809L;
private List<String> names;
public FileMultipleBean() {
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;
}
}
<!DOCTYPE html>
<html xmlns="http://www.w3c.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head></h:head>
<h:body>
<h:form>
<p:fileUpload
fileUploadListener="#{fileMultipleBean.handleFileUpload}"
mode="advanced"
dragDropSupport="false"
multiple="true"
update="messages"
sizeLimit="100000"
fileLimit="3"
allowTypes="/(\.|\/)(gif|jpe?g|png|txt)$/"
/>
<p:growl id="messages" showDetail="true" />
</h:form>
</h:body>
<p:dialog modal="true" widgetVar="statusDialog" header="Status" draggable="false" closable="false" resizable="false">
<p:graphicImage name="images/ajaxloadingbar.gif" />
</p:dialog>
<script type="text/javascript">
function start() {
PF('statusDialog').show();
}
function stop() {
PF('statusDialog').hide();
}
</script>
</html>
当我同时上传三个文件时，这是我的控制台输出，你会看到文件没有保存在列表中：
控制台输出
2015-08-08T20:43:23.468-0400|INFO: @constructor
2015-08-08T20:43:26.182-0400|INFO: @constructor
2015-08-08T20:43:32.350-0400|INFO: @postconstruct
2015-08-08T20:43:40.868-0400|INFO: @constructor
2015-08-08T20:43:44.213-0400|INFO: @postconstruct
2015-08-08T20:43:54.936-0400|INFO: INCOMING FILE: PKG_AUDIT.txt
2015-08-08T20:43:59.483-0400|INFO: Files uploaded:
2015-08-08T20:44:02.985-0400|INFO: # PKG_AUDIT.txt
2015-08-08T20:44:13.391-0400|INFO: @postconstruct
2015-08-08T20:44:19.255-0400|INFO: INCOMING FILE: PKG_AUDIT_ALERT.txt
2015-08-08T20:44:20.654-0400|INFO: Files uploaded:
2015-08-08T20:44:22.886-0400|INFO: # PKG_AUDIT_ALERT.txt
2015-08-08T20:44:31.806-0400|INFO: INCOMING FILE: Test SQL.txt
2015-08-08T20:44:39.194-0400|INFO: Files uploaded:
2015-08-08T20:44:41.946-0400|INFO: # Test SQL.txt
我的Web.xml文件如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>Pack_Encrypt</display-name>
<welcome-file-list>
<welcome-file>index.xhtml</welcome-file>
</welcome-file-list>
<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>
</filter-mapping>
<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>
</web-app>
我的faces.config像这样：
<?xml version="1.0" encoding="UTF-8"?>
<faces-config
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-facesconfig_2_2.xsd"
version="2.2">
</faces-config>
如果我在第一次加载@ViewScoped页面时更改@SessionScoped index.xhtml并上传三个文件，行为是相同的，那么如果我刷新页面并再试一次，列表将包含第一次尝试的最后一项，其他三项，检查下一个控制台输出：
首次上传
2015-08-10T10:15:53.530-0400|INFO: @postconstruct
2015-08-10T10:15:53.604-0400|INFO: INCOMING FILE: PKG_AUDIT.txt
2015-08-10T10:15:54.506-0400|INFO: Files uploaded:
2015-08-10T10:15:54.506-0400|INFO: # PKG_AUDIT.txt
2015-08-10T10:15:55.606-0400|INFO: @postconstruct
2015-08-10T10:15:56.149-0400|INFO: INCOMING FILE: PKG_AUDIT_ALERT.txt
2015-08-10T10:15:56.587-0400|INFO: Files uploaded:
2015-08-10T10:15:56.587-0400|INFO: # PKG_AUDIT_ALERT.txt
2015-08-10T10:15:57.038-0400|INFO: @postconstruct
2015-08-10T10:15:57.449-0400|INFO: INCOMING FILE: Test SQL.txt
2015-08-10T10:15:57.989-0400|INFO: Files uploaded:
2015-08-10T10:15:57.989-0400|INFO: # Test SQL.txt
第二次上传
2015-08-10T10:25:06.850-0400|INFO: INCOMING FILE: 1.txt
2015-08-10T10:25:09.215-0400|INFO: Files uploaded:
2015-08-10T10:25:11.119-0400|INFO: # Test SQL.txt
2015-08-10T10:25:11.999-0400|INFO: # 1.txt
2015-08-10T10:25:15.939-0400|INFO: INCOMING FILE: 2.txt
2015-08-10T10:25:16.488-0400|INFO: Files uploaded:
2015-08-10T10:25:16.488-0400|INFO: # Test SQL.txt
2015-08-10T10:25:16.488-0400|INFO: # 1.txt
2015-08-10T10:25:16.488-0400|INFO: # 2.txt
2015-08-10T10:25:16.888-0400|INFO: INCOMING FILE: 3.txt
2015-08-10T10:25:17.189-0400|INFO: Files uploaded:
2015-08-10T10:25:17.189-0400|INFO: # Test SQL.txt
2015-08-10T10:25:17.189-0400|INFO: # 1.txt
2015-08-10T10:25:17.189-0400|INFO: # 2.txt
2015-08-10T10:25:17.189-0400|INFO: # 3.txt
我检查了Cookie，正如@BalusC建议的那样，以下说明中的数据可能会有所帮助，39的大小，域名，路径，过期/最大年龄设置为N/A：
Request Cookies 39
JSESSIONID 7f6179234f8ec0b82e482901bfff N/A N/A N/A 39
Response 0