java - 下载二进制文件会抛出 org.jvnet.mimepull.MIMEParsingException : java. io.IOException:流已关闭

Question

我正在使用 Jersey Multipart 通过 Rest API 将文件上传到服务器。我使用 Jersey 提供给我的 InputStream 对象作为参数 @FormDataParam("upload_scn") ( upload_scn 在我的 index.html 中定义如下
<div><input type="file" id="upload-suite-file" name="upload_scn" class="file_upload" ></div> )。

准确地说，我正在下载一个 *.pdf 文件(我不知道为什么这是一个问题，因为下载小“.txt”文件很好 - 它总是成功)。当我执行下面的代码时:

private void saveToDisk(InputStream uploadedInputStream, FormDataContentDisposition fileDetail,
    FormDataMultiPart multiPart) {

  String uploadedFileLocation = "C:\\temp\\" + fileDetail.getFileName();
  Object str = multiPart.getField("upload_scn");
  Map<String, String> params = fileDetail.getParameters();
  System.out.println(params);
  try {

    OutputStream out = new FileOutputStream(new File(uploadedFileLocation));

    int read = 0;
    byte[] bytes = new byte[1024];
    out = new FileOutputStream(new File(uploadedFileLocation));

    while ((read = uploadedInputStream.read(bytes)) != -1) {
      out.write(bytes, 0, read);
    }

    out.flush();
    out.close();

  } catch (Exception ex) {
    ex.printStackTrace();
    System.out.println("Problem");
  }
}

...我遇到异常:

{name=upload_scn, filename=11092019105903-0001.pdf}  
    org.jvnet.mimepull.MIMEParsingException: java.io.IOException: Stream Closed
        at org.jvnet.mimepull.WeakDataFile.read(WeakDataFile.java:85)
        at org.jvnet.mimepull.DataFile.read(DataFile.java:47)
        at org.jvnet.mimepull.FileData.read(FileData.java:39)
        at org.jvnet.mimepull.DataHead$ReadMultiStream.fetch(DataHead.java:235)
        at org.jvnet.mimepull.DataHead$ReadMultiStream.read(DataHead.java:189)
        at java.io.InputStream.read(InputStream.java:101)
        at com.jci.remoteUploaderResources.DownloadFile.saveToDisk(DownloadFile.java:61)
        at com.jci.remoteUploaderResources.DownloadFile.uploadFile(DownloadFile.java:42)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124)
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167)
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:219)
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79)
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:469)
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:391)
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:80)
        at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:253)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:232)
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680)
        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:392)
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:365)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:318)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1839)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
    Caused by: java.io.IOException: Stream Closed
        at java.io.RandomAccessFile.seek0(Native Method)
        at java.io.RandomAccessFile.seek(RandomAccessFile.java:557)
        at org.jvnet.mimepull.WeakDataFile.read(WeakDataFile.java:82)
        ... 55 more

我做错了什么？为什么OutputStream out从路径 uploadedFileLocation 创建突然关闭了 - 我还在处理它!!!
我在这里缺少什么？

Answer 1

如果您使用 SpotBugs 分析源代码你得到 OS_OPEN_STREAM和 OS_OPEN_STREAM_EXCEPTION_PATH警告表明您可能无法关闭流:

com.lloyds.mavenproject1.NewClass.saveToDisk(InputStream, FormDataContentDisposition, FormDataMultiPart) may fail to close stream [com.lloyds.mavenproject1.NewClass] At NewClass.java:[line 22] OS_OPEN_STREAM
com.lloyds.mavenproject1.NewClass.saveToDisk(InputStream, FormDataContentDisposition, FormDataMultiPart) may fail to close stream on exception [com.lloyds.mavenproject1.NewClass] At NewClass.java:[line 26] OS_OPEN_STREAM_EXCEPTION_PATH

有一种简单的方法可以将输入流中的所有字节复制到文件 - Files.copy(in, path) :

Path path = Paths.get("C:\\temp\\" + fileDetail.getFileName());
try (InputStream in = uploadedInputStream) {
  Files.copy(in, path);
}