在带有PrimeFaces 3.3的项目中，文件上传正常运行。我删除了Primefaces 3.3，并添加了3.5。从那时起，我无法进行文件上传。早些时候，我添加了commons-io和commons.fileupload，但我不确定它们是否仍然需要，因此我也保留了这些jar文件。
错误
java.lang.NullPointerException
at org.primefaces.component.fileupload.FileUploadRenderer.decodeSimple(FileUploadRenderer.java:56)
at org.primefaces.component.fileupload.FileUploadRenderer.decode(FileUploadRenderer.java:47)
at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:836)
at javax.faces.component.UIInput.decode(UIInput.java:771)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1228)
at javax.faces.component.UIInput.processDecodes(UIInput.java:676)
at javax.faces.component.UIForm.processDecodes(UIForm.java:225)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1223)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1223)
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:929)
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:724)
菜豆
public void handleFileUpload1(FileUploadEvent event) {
System.out.println("uploading");
FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, msg);
System.out.println("uploaf finished");
}
JSF页面
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Facelet Title</title>
<h:outputStylesheet library="css" name="maincss.css" />
</h:head>
<h:body>
<h:form enctype="multipart/form-data">
<p:fileUpload fileUploadListener="#{staffController.handleFileUpload1}" mode="simple" value="#{staffController.file}"
allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />
<p:commandButton ajax="false" value="Submit" />
</h:form>
</h:body>
</html>
web.xml文件
<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></param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
当版本从3.3更改为3.5时，我也遇到了同样的问题
但最终得到下面给出的第二个解决方案
第一种解决方案
primefaces高级文件上传中存在一些问题
我认为mode="simple"是p:fileUpload标签中的问题
制作mode="advanced"并测试一次。
如果有效，然后
问题是您正在给mode =“ simple”并尝试以高级方式进行处理。
第二个解决方案使您的文件上传如下所示，以一种简单的方式进行处理
<p:fileUpload value="#{staffController.file}" mode="simple"/>
<p:commandButton value="Submit" ajax="false" actionListener="#{staffController.upload}"/>
并在您的Backing Bean / Controller / staffController中
创建一个属性
private UploadedFile file;
//getter setters
并放置如下所示的上传方法
public void upload() {
System.out.println("uploading");
if(file != null) {
FacesMessage msg = new FacesMessage("Succesful", file.getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage(null, msg);
}
System.out.println("uploaf finished");
}
希望能帮助到你
您好，抱歉，回复晚了。
请检查您是否在web.xml中为Servlet添加了文件上传过滤器。
1）
<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><!-- your FacesServlet Name -->
</filter-mapping>
2）
在lib文件夹中添加commons-fileupload1.3.jar文件。
3）
确保您的表单是否具有enctype属性
<h:form enctype="multipart/form-data"> <!-- enctype tag is important -->
请检查以上3点。
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我来说两句