如何将try-catch放在事件方法中以定制catch-java
我已经创建了一种方法,用于在使用PrimeFaces的p:fileupload标记时处理文件上载:如何将try-catch放在事件方法中以定制catch-java,java,events,file-upload,primefaces,try-catch,Java,Events,File Upload,Primefaces,Try Catch,我已经创建了一种方法,用于在使用PrimeFaces的p:fileupload标记时处理文件上载: public void handleFileUpload(FileUploadEvent event) throws IOException { FacesContext.getCurrentInstance() .getExternalContext() .getSessionMap().put("limage", event.getFile());
public void handleFileUpload(FileUploadEvent event) throws IOException {
FacesContext.getCurrentInstance()
.getExternalContext()
.getSessionMap().put("limage", event.getFile());
}
但在测试此代码时,我遇到了一个异常:
GRAVE: C:\tmp\upload_6d3af437_13dda559a63__8000_00000082.tmp (Le fichier spécifié est introuvable)
java.io.FileNotFoundException: C:\tmp\upload_6d3af437_13dda559a63__8000_00000082.tmp (Le fichier spécifié est introuvable)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:120)
at org.apache.commons.fileupload.disk.DiskFileItem.readObject(DiskFileItem.java:719)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at java.util.HashMap.readObject(HashMap.java:1030)
at sun.reflect.GeneratedMethodAccessor105.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1666)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1322)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at java.util.HashMap.readObject(HashMap.java:1030)
at sun.reflect.GeneratedMethodAccessor105.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at com.sun.faces.renderkit.ClientSideStateHelper.doGetState(ClientSideStateHelper.java:255)
at com.sun.faces.renderkit.ClientSideStateHelper.getState(ClientSideStateHelper.java:198)
at com.sun.faces.renderkit.ResponseStateManagerImpl.getState(ResponseStateManagerImpl.java:100)
at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:227)
at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:188)
at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:453)
at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:148)
at com.ocpsoft.pretty.faces.application.PrettyViewHandler.restoreView(PrettyViewHandler.java:109)
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:192)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:126)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
我认为问题不在指令中,但可能发生在指令运行之前。以下是我的UI代码:
<p:fileUpload mode="advanced" auto="true"
fileUploadListener="#{articlesMB.handleFileUpload}" />
我如何修复错误?谢谢。getFile不会引发异常。您显示的代码只是将文件放入会话映射中。异常被抛出到使用文件对象的其他地方
正如我从stacktrace中看到的,当会话试图在请求之间进行反序列化时,就会发生这种情况。您应该将该文件存储在其他地方,因为该文件在多部分http请求完成后立即被框架删除。能否显示完整的stacktrace?您的primefaces和myfaces/Mojarra版本是什么?即使我对会话行进行注释,例外情况是launchedwhat您建议我如何处理您上传的文件在请求之间的传递。它试图还原视图,但失败了,因为file对象在临时目录中只保存文件名,但该文件已被删除。@simonTifo很难说,我没有看到您的源代码。你需要解决这个问题。试着从教程的上传页面开始,看看它是否有效。我的问题是当我第一次上传时,第二次也是,但第三次是50%…,但是当我在没有ajax的情况下使用这个文件上传时,它就有效了,如果你想我制作一个视频来解释更多的问题,或者。。。
<p:fileUpload mode="advanced" auto="true"
fileUploadListener="#{articlesMB.handleFileUpload}" />