java - CommonsMultipartFile - FileNotFoundException

Question

我正在尝试开发一个应用程序，用户将从屏幕上传文件，该文件将在服务器端进行处理。我正在使用 Adob​​e Flex 的 UI，Spring 3.2 作为中间件和 Java 5。我可以成功上传文件并在服务器端获取文件名。但是当我尝试获取 InputStream 时，我得到了 FileNotFoundException。它试图在应用程序服务器内的某个位置创建临时文件并尝试读取该临时文件进行处理，但未能创建临时文件。以下是我尝试获取文件的代码片段 -

public List<TransactionVO> populateVO(VoucherUploadCommandForm object,
Connection conn) throws XenosException {
   log.debug("InVoucherVOPopulatorForExcelUpload.populateVO()");
     if(object == null){
     log.debug(" No file uploaded :(");
   }else{
     CommonsMultipartFile file = object.getFileName();
     log.debug(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Excel file uploaded :)");
     log.debug("Excel file= "+ file.getOriginalFilename());
     try {
        log.debug("Excel Size= "+ file.getSize());
        log.debug("Excel fileItem= "+ file.getFileItem().getInputStream());
     } catch (IOException e) {
         log.error(e);
     }
   }
   return null;
}

错误的stackTrace如下-

SEVERE: Exception loading sessions from persistent storage
java.io.FileNotFoundException: C:\apache-tomcat-6.0.20\work\Catalina\localhost\rui-1.1-xenos\upload_375f4172_d416_4ae2_975f_bc5e908a8303_00000007.tmp (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at org.apache.commons.fileupload.disk.DiskFileItem.readObject(DiskFileItem.java:663)
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:585)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1441)
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:942)
at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:394)
at org.apache.catalina.session.StandardManager.load(StandardManager.java:321)
at org.apache.catalina.session.StandardManager.start(StandardManager.java:637)
at org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:438)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4358)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:630)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:556)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:491)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
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:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Nov 25, 2013 2:56:18 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8084
Nov 25, 2013 2:56:18 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Nov 25, 2013 2:56:18 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/20 config=null
Nov 25, 2013 2:56:18 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 45220 ms

Answer 1

配置您的 CommonsMultipartResolver 使用默认目录以外的目录。为此，设置 CommonsMultipartResolver 的 uploadTempDir 属性。

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="uploadTempDir" value="d:/temp" />
</bean>

请注意您的代码，您应该针对接口(interface)而不是具体类进行编程。在您的 Controller 中，将 CommonsMultipartFile 更改为 MultipartFile。

在您的代码中，您正在直接检索底层 FileItem，为此您应该使用 MultipartFile 便捷方法。您可以简单地在您拥有的 MultipartFile 实例上调用 getInputStream()。

public List<TransactionVO> populateVO(VoucherUploadCommandForm object, Connection conn) throws XenosException {
    log.debug("InVoucherVOPopulatorForExcelUpload.populateVO()");
    if(object == null){
        log.debug(" No file uploaded :(");
    }else{
        MultipartFile file = object.getFileName();
        log.debug(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Excel file uploaded :)");
        log.debug("Excel file= "+ file.getOriginalFilename());
        try {
            log.debug("Excel Size= "+ file.getSize());
            log.debug("Excel fileItem= "+ file.getInputStream());
        } catch (IOException e) {
            log.error(e);
        }
    }
    return null;
}