Question

我尝试使用Hibernate 5.2.11.Final（BLOB类型）和Vert.x 3.4.2从数据库（Postgresql 9.6.5）发送块的二进制数据，但我收到错误的响应（它找我像一些比特缺少）。这是我在Kotlin的代码：

fun getFile(user: User, messageId: Long, fileId: Short, response: HttpServerResponse) {
    val mediaContent = mediaContentRepository.getFile(messageId, fileId)
    when {
        mediaContent == null ->
            response.apply { statusCode = 404 }.end()
        conversationUserRepository.authorize(user.id!!, mediaContent.message!!.conversation!!.id, mediaContent.message!!.created) ->
            response.setChunked(true)
                    .putHeader("Content-Disposition", "attachment; filename=\"${mediaContent.name}\"") //TODO: prevent injections
                    .putHeader("Content-Type", mediaContent.contentType)
                    //.putHeader("Content-Length", mediaContent.file.length().toString())
                    .apply {
                        //write(Buffer.buffer().apply { delegate.setBytes(0, mediaContent.file.binaryStream.readAllBytes()) })
                        val buffer = Buffer.buffer(BUFFER_SIZE)
                        val stream = mediaContent.file.binaryStream
                        val byteArray = ByteArray(BUFFER_SIZE)
                        for (i in (0L..(mediaContent.file.length() / BUFFER_SIZE))) {
                            val bytesRead = stream.read(byteArray)
                            buffer.delegate.setBytes(0, byteArray, 0, bytesRead)
                            write(if (bytesRead == BUFFER_SIZE) buffer else buffer.slice(0, bytesRead))
                        }
                    }
                    .end()
        else ->
            response.apply { statusCode = 403 }.end()
    }
}

但是当我尝试使用此行一次发送整个文件时，响应是正确的。

write(Buffer.buffer().apply { delegate.setBytes(0, mediaContent.file.binaryStream.readAllBytes()) })

知道我做错了吗？

编辑：我通常会收到同一文件的不同回复，这也很有帮助。

Answer 1

我得到了它的工作，但我不知道为什么它正在工作。它对我来说看起来像循环中重用vert.x缓冲区有问题。代码

fun getFile(user: User, messageId: Long, fileId: Short, response: HttpServerResponse) {
        val mediaContent = mediaContentRepository.getFile(messageId, fileId)
        when {
            mediaContent == null ->
                response.apply { statusCode = 404 }.end()
            conversationUserRepository.authorize(user.id!!, mediaContent.message!!.conversation!!.id, mediaContent.message!!.created) ->
                response.putHeader("Content-Disposition", "attachment; filename=\"${mediaContent.name}\"") //TODO: prevent injections
                        .putHeader("Content-Type", mediaContent.contentType)
                        .putHeader("Content-Length", mediaContent.file.length().toString())
                        .apply {
                            val stream = mediaContent.file.binaryStream
                            val byteArray = ByteArray(BUFFER_SIZE)
                            for (i in (0L..(mediaContent.file.length() / BUFFER_SIZE))) {
                                val bytesRead = stream.read(byteArray)
                                write(Buffer(io.vertx.core.buffer.Buffer.buffer(byteArray)
                                        .let {
                                            if (bytesRead == BUFFER_SIZE) it
                                            else it.slice(0, bytesRead)
                                        }))
                            }
                        }
                        .end()
            else ->
                response.apply { statusCode = 403 }.end()
        }
    }

Vert.x使用BLOB和hibernate对来自数据库的数据进行了分块回答

1 个答案: