Jsf uploadFile.getInputstream（）抛出java.nio.file.NoSuchFileException

我使用JSF2.2和PrimeFaces5.3。我想把上传的文件保存在磁盘上。下面你可以看到我是如何做到这一点的。当我按下一个

Send

按钮时，我得到一个

java.nio.file.NoSuchFileException

异常（在我文章的末尾，我还放了一个完整的stacktrace）：

错误[stderr]（默认任务-24）java.nio.file.NoSuchFileException:[PATH]\Wildfly\u 10\Wildfly\u HOME\standalone\tmp\MasterProject.war\endow1357918758070690245upload

当我跟踪stacktrace时，我看到异常是由这行引起的（我认为是这样）：

try（InputStream input=uploadFile.getInputstream（））{

这对我来说很奇怪。我可以得到上传文件的名称（通过

uploadFile.getFileName（）

），但我不能得到文件的大小（通过

uploadFile.getSize（）

），也不能得到

InputStream

（通过

uploadFile.getInputstream（）

），在这两种情况下我都得到

NoSuchFileException

异常

附加信息：我必须上传大文件（即200 MB或更多）。当然，我上传小文件时也会遇到同样的例外情况

你知道我为什么会遇到这个异常吗？我如何解决这个问题

这是我上传文件的页面的一部分：

<h:form>
    <p:growl id="messages" showDetail="true" />
    <p:panelGrid id="panel" columns="2" styleClass="ui-noborder" columnClasses="rightalign,leftalign">

        <p:outputLabel for="file" value="File:" />
        <p:fileUpload id="file" fileLimit="1"
                    fileUploadListener="#{dataController.handleFileUpload}" 
                    mode="advanced" dragDropSupport="true" sizeLimit="1000000000" 
                    uploadLabel="Upload" cancelLabel="Delete" allowTypes="/(\.|\/)(csv|binetflow)$/" />                                             
        <p:commandButton id="buttonSend" value="Send" 
                        action="#{dataController.send()}" update="messages"/>                       

    </p:panelGrid>                                              
</h:form>

这是完整的堆栈跟踪：

10:40:45,822 ERROR [stderr] (default task-24) java.nio.file.NoSuchFileException: [PATH]\Wildfly_10\WILDFLY_HOME\standalone\tmp\MasterProject.war\undertow1357918758070690245upload

10:40:45,823 ERROR [stderr] (default task-24)   at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79)

10:40:45,823 ERROR [stderr] (default task-24)   at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)

10:40:45,823 ERROR [stderr] (default task-24)   at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)

10:40:45,823 ERROR [stderr] (default task-24)   at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:230)

10:40:45,823 ERROR [stderr] (default task-24)   at java.nio.file.Files.newByteChannel(Files.java:361)

10:40:45,824 ERROR [stderr] (default task-24)   at java.nio.file.Files.newByteChannel(Files.java:407)

10:40:45,824 ERROR [stderr] (default task-24)   at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384)

10:40:45,824 ERROR [stderr] (default task-24)   at java.nio.file.Files.newInputStream(Files.java:152)

10:40:45,824 ERROR [stderr] (default task-24)   at io.undertow.servlet.spec.PartImpl.getInputStream(PartImpl.java:63)

10:40:45,824 ERROR [stderr] (default task-24)   at org.primefaces.model.NativeUploadedFile.getInputstream(NativeUploadedFile.java:45)

10:40:45,824 ERROR [stderr] (default task-24)   at com.system.controller.DataController.send(DataController.java:163)

10:40:45,824 ERROR [stderr] (default task-24)   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

10:40:45,825 ERROR [stderr] (default task-24)   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

10:40:45,825 ERROR [stderr] (default task-24)   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

10:40:45,825 ERROR [stderr] (default task-24)   at java.lang.reflect.Method.invoke(Method.java:498)

10:40:45,825 ERROR [stderr] (default task-24)   at javax.el.ELUtil.invokeMethod(ELUtil.java:308)

10:40:45,825 ERROR [stderr] (default task-24)   at javax.el.BeanELResolver.invoke(BeanELResolver.java:415)

10:40:45,825 ERROR [stderr] (default task-24)   at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)

10:40:45,825 ERROR [stderr] (default task-24)   at com.sun.el.parser.AstValue.invoke(AstValue.java:285)

10:40:45,825 ERROR [stderr] (default task-24)   at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)

10:40:45,826 ERROR [stderr] (default task-24)   at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)

10:40:45,826 ERROR [stderr] (default task-24)   at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)

10:40:45,826 ERROR [stderr] (default task-24)   at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)

10:40:45,826 ERROR [stderr] (default task-24)   at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)

10:40:45,826 ERROR [stderr] (default task-24)   at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)

10:40:45,826 ERROR [stderr] (default task-24)   at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)

10:40:45,826 ERROR [stderr] (default task-24)   at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)

10:40:45,827 ERROR [stderr] (default task-24)   at javax.faces.component.UICommand.broadcast(UICommand.java:315)

10:40:45,827 ERROR [stderr] (default task-24)   at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)

10:40:45,827 ERROR [stderr] (default task-24)   at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)

10:40:45,827 ERROR [stderr] (default task-24)   at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)

10:40:45,827 ERROR [stderr] (default task-24)   at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

10:40:45,827 ERROR [stderr] (default task-24)   at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)

10:40:45,828 ERROR [stderr] (default task-24)   at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)

10:40:45,828 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)

10:40:45,828 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)

10:40:45,828 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)

10:40:45,829 ERROR [stderr] (default task-24)   at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)

10:40:45,829 ERROR [stderr] (default task-24)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

10:40:45,829 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)

10:40:45,829 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)

10:40:45,829 ERROR [stderr] (default task-24)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

10:40:45,830 ERROR [stderr] (default task-24)   at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)

10:40:45,830 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)

10:40:45,830 ERROR [stderr] (default task-24)   at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)

10:40:45,830 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)

10:40:45,831 ERROR [stderr] (default task-24)   at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)

10:40:45,831 ERROR [stderr] (default task-24)   at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)

10:40:45,831 ERROR [stderr] (default task-24)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

10:40:45,831 ERROR [stderr] (default task-24)   at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)

10:40:45,831 ERROR [stderr] (default task-24)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

10:40:45,832 ERROR [stderr] (default task-24)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)

10:40:45,832 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)

10:40:45,832 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)

10:40:45,832 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)

10:40:45,833 ERROR [stderr] (default task-24)   at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)

10:40:45,833 ERROR [stderr] (default task-24)   at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)

10:40:45,833 ERROR [stderr] (default task-24)   at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)

10:40:45,833 ERROR [stderr] (default task-24)   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

10:40:45,833 ERROR [stderr] (default task-24)   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

10:40:45,834 ERROR [stderr] (default task-24)   at java.lang.Thread.run(Thread.java:745)

更新： 我注意到一些新的内容。如果我将

send（）

方法的内容移动到

handleFileUpload（）

方法（下面的代码）-文件将保存在磁盘上：

@Named
@ViewScoped
public class DataController implements Serializable {

    private static final long serialVersionUID = 1383572529241805730L;

    public void handleFileUpload(FileUploadEvent event){

        uploadFile=event.getFile(); 

        try(InputStream input = uploadFile.getInputstream()){

            Path folder=Paths.get("F:/Files");
            String filename = FilenameUtils.getBaseName(uploadFile.getFileName()); 
            String extension = FilenameUtils.getExtension(uploadFile.getFileName());
            Path file = Files.createTempFile(folder, filename + "-", "." + extension);
            Files.copy(input, file, StandardCopyOption.REPLACE_EXISTING);

            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Successful", "Uploaded file successfully saved in " + file));          

        } catch (IOException e1) {
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERROR", null));
            e1.printStackTrace();
        }

        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Successful", event.getFile().getFileName() + " is uploaded"));
    }

    public void send(){

    }

    private UploadedFile uploadFile;
}

但是如果用户按下

Send

按钮，我想将上传的文件保存在磁盘上，而不是更早（即用户按下

Upload

按钮时），因此有必要将文件保存在

Send（）

方法中

我还注意到，当我使用

组件的一个简单模式（下面修改的表单）时，一切都正常（即，当用户按下按钮时，文件被保存）。我必须为

DataController

bean中的

uploadFile

对象创建getter和setter以使用

{DataController.uploadFile}

。我也必须将

enctype=“multipart/form data”

属性添加到

组件中（如果没有此属性，则无法工作）

这个解决方案的问题是：我需要

组件的高级模式

我不明白当我使用高级模式时，为什么我不能在

send（）

方法中访问上载的文件。我使用

@ViewScoped

范围，所以它应该可以工作

uploadFile.getInputstream（）抛出java.nio.file.NoSuchFileException

您的具体问题是因为您试图读取上一个请求中上载的上载文件。当HTTP请求完成时，一个稍微体面的容器将清理与HTTP请求相关的所有临时数据。这显然还包括WildFly中未读取的上载文件（但不知道其他人的行为如何）

如果有必要，最好直接将它们保存在某个临时位置。然后，在最终操作方法中，将它们移动/重命名到所需的永久位置/名称。为了清除“遗忘”文件如果最终用户在上传了一堆文件后从未调用最终操作方法，那么最好的办法是跟踪会话范围bean中的所有

文件
s，并在
@PreDestroy
注释方法中执行
File.delete（）

如果上传表单是视图范围，并且您使用的是OmniFaces，那么您也可以使用OmniFaces CDI，当用户通过导航或关闭选项卡/窗口卸载页面时，该CDI的
@PreDestroy
将已经运行。
所选答案的实现
我忘了添加所选答案的实现，所以我现在正在添加。基于@BalusC给出的解决方案之一：

我添加了
UserFileManager
bean（下面的代码），它管理未确认的文件，并在会话过期时删除它们
我将
UserFileManager
注入
DataController
bean
我将
try catch
从
send（）
方法移动到
handleFileUpload（）
方法，因此当用户按下
Upload
按钮时，文件保存在磁盘上
将文件保存到临时文件夹后，我在
handleFileUpload（）
方法中调用了
userFileManager.addUnconfirmedUploadedFile（file）
。现在，如果用户不按下
发送
按钮，我们可以确定该文件将被删除（会话到期时）
最后，我在
send（）
方法中调用了
userFileManager.confirmUploadedFile（file）
。现在我们确定用户希望将该文件保留在磁盘上，因此我们将该文件从未确认文件列表中删除
注意：您上传的文件存储在WildFly server的可写
/standalone/data/upload
文件夹或
/standalone/data
文件夹中，如果在创建
upload
文件夹过程中出现问题，则存储在
/data
文件夹中

这是经过修改的
DataController
bean：

@Named
@ViewScoped
public class DataController implements Serializable {

    private static final long serialVersionUID = 1383572529241805730L;

    public void handleFileUpload(FileUploadEvent event){

        uploadFile=event.getFile();    

        try(InputStream input = uploadFile.getInputstream()){

            Path folder=Paths.get(System.getProperty("jboss.server.data.dir"),"upload");

            if(!folder.toFile().exists()){
                if(!folder.toFile().mkdirs()){
                    folder=Paths.get(System.getProperty("jboss.server.data.dir"));
                }
            }

            String filename = FilenameUtils.getBaseName(uploadFile.getFileName()); 
            String extension = FilenameUtils.getExtension(uploadFile.getFileName());
            Path filePath = Files.createTempFile(folder, filename + "-", "." + extension);
            Files.copy(input, filePath, StandardCopyOption.REPLACE_EXISTING);

            userFileManager.addUnconfirmedUploadedFile(filePath.toFile());

            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Successful", event.getFile().getFileName() + " is uploaded"));

        } catch (IOException e1) {

            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERROR I/O", "Code of the error: DC1"));
            e1.printStackTrace();
        }
    }

    public void send(){

        userFileManager.confirmUploadedFile(filePath.toFile());

        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "The data has been added.", ""));
    }

     @Inject
    private UserFileManager userFileManager;
    private UploadedFile uploadFile;
}

这是@BalusC创建的
UserFileManager
bean：

@SessionScoped
公共类UserFileManager实现可序列化{
私有静态最终长serialVersionUID=-5410871255899363212L；
/**
*列表的初始化。
*/
@施工后
公共void init（）{
unconfirmedUploadedFiles=新建ArrayList（）；
}
/**
*将未确认的文件添加到列表中。
*@param unconfirmedUplo
<h:form enctype="multipart/form-data">
    <p:growl id="messages" showDetail="true" />
    <p:panelGrid id="panel" columns="2" styleClass="ui-noborder" columnClasses="rightalign,leftalign">

        <p:outputLabel for="file" value="File:" />
        <p:fileUpload id="file" value="#{dataController.uploadFile}" mode="simple" skinSimple="true" sizeLimit="1000000000" allowTypes="/(\.|\/)(csv|binetflow)$/"/>
        <p:commandButton value="Submit" ajax="false" actionListener="#{dataController.send()}" disabled="false" />                                                                                                                                          

    </p:panelGrid>                                              
</h:form>

@Named
@ViewScoped
public class DataController implements Serializable {

    private static final long serialVersionUID = 1383572529241805730L;

    public void handleFileUpload(FileUploadEvent event){

        uploadFile=event.getFile();    

        try(InputStream input = uploadFile.getInputstream()){

            Path folder=Paths.get(System.getProperty("jboss.server.data.dir"),"upload");

            if(!folder.toFile().exists()){
                if(!folder.toFile().mkdirs()){
                    folder=Paths.get(System.getProperty("jboss.server.data.dir"));
                }
            }

            String filename = FilenameUtils.getBaseName(uploadFile.getFileName()); 
            String extension = FilenameUtils.getExtension(uploadFile.getFileName());
            Path filePath = Files.createTempFile(folder, filename + "-", "." + extension);
            Files.copy(input, filePath, StandardCopyOption.REPLACE_EXISTING);

            userFileManager.addUnconfirmedUploadedFile(filePath.toFile());

            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Successful", event.getFile().getFileName() + " is uploaded"));

        } catch (IOException e1) {

            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "ERROR I/O", "Code of the error: DC1"));
            e1.printStackTrace();
        }
    }

    public void send(){

        userFileManager.confirmUploadedFile(filePath.toFile());

        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "The data has been added.", ""));
    }

     @Inject
    private UserFileManager userFileManager;
    private UploadedFile uploadFile;
}

@SessionScoped
public class UserFileManager implements Serializable {

    private static final long serialVersionUID = -5410871255899363212L;

    /**
     * Initialization of list.
     */
    @PostConstruct
    public void init(){
        unconfirmedUploadedFiles = new ArrayList<>();
    }

    /**
     * Adding the unconfirmed file to the list.
     * @param unconfirmedUploadedFile unconfirmed file.
     */
    public void addUnconfirmedUploadedFile(File unconfirmedUploadedFile) {
        unconfirmedUploadedFiles.add(unconfirmedUploadedFile);
    }

    /**
     * Deleting the confirmed file from the list.
     * @param confirmedUploadedFile confirmed file. 
     */
    public void confirmUploadedFile(File confirmedUploadedFile) {
        unconfirmedUploadedFiles.remove(confirmedUploadedFile);
    }

    /**
     * Deleting unconfirmed files from the disk if the session is expired.
     */
    @PreDestroy
    public void destroy() {
        for (File unconfirmedUploadedFile : unconfirmedUploadedFiles) {
            unconfirmedUploadedFile.delete();
        }
    }   

    //The list which stores the unconfirmed files.
    private List<File> unconfirmedUploadedFiles;
}