Java Vert.x使用BLOB和hibernate使用数据库中的数据对答案进行分块
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)发送大块二进制数据作为响应,但收到了错误的响应(在我看来,有些位丢失了)。以下是我在Kotlin中的代码:Java Vert.x使用BLOB和hibernate使用数据库中的数据对答案进行分块,java,postgresql,hibernate,kotlin,vert.x,Java,Postgresql,Hibernate,Kotlin,Vert.x,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)发送大块二进制数据作为响应,但收到了错误的响应(在我看来,有些位丢失了)。以下是我在Kotlin中的代码: fun getFile(user: User, messageId: Long, fileId: Short, response: HttpServerResponse) { val mediaContent = mediaContentRep
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=\"${mediaContent.name}\"") //TODO: prevent injections
.putHeader("Content-Type", mediaContent.contentType)
//.putHeader("Content-Length", mediaContent.file.length().toString())
.apply {
//write(Buffer.buffer().apply { delegate.setBytes(0, mediaContent.file.binaryStream.readAllBytes()) })
val buffer = Buffer.buffer(BUFFER_SIZE)
val stream = mediaContent.file.binaryStream
val byteArray = ByteArray(BUFFER_SIZE)
for (i in (0L..(mediaContent.file.length() / BUFFER_SIZE))) {
val bytesRead = stream.read(byteArray)
buffer.delegate.setBytes(0, byteArray, 0, bytesRead)
write(if (bytesRead == BUFFER_SIZE) buffer else buffer.slice(0, bytesRead))
}
}
.end()
else ->
response.apply { statusCode = 403 }.end()
}
}
但当我试图使用这一行同时发送整个文件时,响应是正确的
write(Buffer.buffer().apply { delegate.setBytes(0, mediaContent.file.binaryStream.readAllBytes()) })
知道我做错了什么吗
编辑:对于同一个文件,我通常会收到不同的响应,这也很有帮助。我让它工作了,但我不知道它工作的确切原因。就我而言,在循环中重用vert.x缓冲区似乎有问题。代码如下
fun getFile(user: User, messageId: Long, fileId: Short, response: HttpServerResponse) {
val mediaContent = mediaContentRepository.getFile(messageId, fileId)
when {
mediaContent == null ->
response.apply { statusCode = 404 }.end()
conversationUserRepository.authorize(user.id!!, mediaContent.message!!.conversation!!.id, mediaContent.message!!.created) ->
response.putHeader("Content-Disposition", "attachment; filename=\"${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()
}
}