使用 jersey-1.7 在 Google Appengine 上上传多部分文件

2022-01-21 00:00:00 google-app-engine java jersey

我用 Jersey 在 Google Appengine 上编写了一个应用程序来处理简单的文件上传.这在球衣 1.2 上运行良好.在更高版本(当前 1.7)中，引入了 @FormDataParam 来处理多部分/表单输入.我正在使用 jersey-multipart 和 mimepull 依赖项.似乎新的做法是在 appengine 中创建我们都知道是非法的临时文件...

I wrote an application on Google Appengine with Jersey to handle simple file uploading. This works fine when it was on jersey 1.2. In the later versions (current 1.7) @FormDataParam is introduced to handle multipart/form inputs. I am using jersey-multipart and the mimepull dependency. It seems that the new way of doing it is creating temporary files in appengine which we all know is illegal...

由于 Jersey 现在应该与 AppEngine 兼容，我是否在这里遗漏了什么或做错了什么?

Am I missing something or doing something wrong here since Jersey is now supposedly compatible with AppEngine?

@POST 
@Path("upload") 
@Consumes(MediaType.MULTIPART_FORM_DATA) 
public void upload(@FormDataParam("file") InputStream in) { .... }

上述异常调用时会失败...

The above will fail when called with these exceptions...

/upload
java.lang.SecurityException: Unable to create temporary file
    at java.io.File.checkAndCreate(File.java:1778)
    at java.io.File.createTempFile(File.java:1870)
    at java.io.File.createTempFile(File.java:1907)
    at org.jvnet.mimepull.MemoryData.createNext(MemoryData.java:87)
    at org.jvnet.mimepull.Chunk.createNext(Chunk.java:59)
    at org.jvnet.mimepull.DataHead.addBody(DataHead.java:82)
    at org.jvnet.mimepull.MIMEPart.addBody(MIMEPart.java:192)
    at org.jvnet.mimepull.MIMEMessage.makeProgress(MIMEMessage.java:235)
    at org.jvnet.mimepull.MIMEMessage.parseAll(MIMEMessage.java:176)
    at org.jvnet.mimepull.MIMEMessage.getAttachments(MIMEMessage.java:101)
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.readMultiPart(MultiPartReaderClientSide.java:177)
    at com.sun.jersey.multipart.impl.MultiPartReaderServerSide.readMultiPart(MultiPartReaderServerSide.java:80)
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:139)
    at com.sun.jersey.multipart.impl.MultiPartReaderClientSide.readFrom(MultiPartReaderClientSide.java:77)
    at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:474)
    at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:538)

有人知道吗?有没有办法在防止 mimepull 创建临时文件的同时做事?

Anyone have a clue? Is there a way to do thing while preventing mimepull from creating the temporary file?

推荐答案

对于超出其默认大小的文件，multipart 将创建一个临时文件.为了避免这种情况——在 gae 上创建文件是不可能的——你可以在项目的资源文件夹中创建一个 jersey-multipart-config.properties 文件并将这一行添加到其中:

For files beyond its default size, multipart will create a temporary file. To avoid this — creating a file is impossible on gae — you can create a jersey-multipart-config.properties file in the project's resources folder and add this line to it: 

bufferThreshold = -1

那么，代码就是你给的那个:

Then, the code is the one you gave:

@POST
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response post(@FormDataParam("file") InputStream stream, @FormDataParam("file") FormDataContentDisposition disposition) throws IOException {
  post(file, disposition.getFileName());
  return Response.ok().build();
}

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