Android通过OKHTTP上传文件不使用MultiPart

Posted 2023-03-22

【中文标题】Android通过OKHTTP上传文件不使用MultiPart

【英文标题】：Android Upload a file via OKHTTP not using MultiPart

【发布时间】：2020-05-08 11:35:39

【问题描述】：

这是我必须上传文件的代码：

fun uploadFile(oid: String, file: Attachment, mime: String, callback: Callback): Call 
    val url = getURL(XelionOKHttpAPIRestLinks.UPLOAD_FILE.replace("__OID__", oid))
    var mediaType = mime.toMediaType()
    var body = MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", file.originalLocation,
            RequestBody.create(mediaType, file.originalLocation)).build()
    val request = Request.Builder().url(url).headers(setHeaderUpload(mime, file.commonName, file.size.toString())).post(body).build()
    val call = client.newCall(request)
    call.enqueue(callback)
    return call

这对我来说非常有效。但是服务器不支持 MultiPart。所以我需要一次性发送文件。这怎么可能？

我也尝试过使用 HTTPConnection：

     var async = object : AsyncTask<Void, Void, String>() 
        override fun doInBackground(vararg params: Void?): String 
            val url = URL(getURL(XelionOKHttpAPIRestLinks.UPLOAD_FILE.replace("__OID__", oid)))
            try 
                val urlConnection: HttpURLConnection = url.openConnection() as HttpURLConnection
                var nameOnly = attachment.commonName.split("/")
                urlConnection.setRequestMethod("POST")
                urlConnection.setDoOutput(true)
                urlConnection.setRequestProperty("Authorization", "xelion " + XelionPreferences.INSTANCE.authToken)
                urlConnection.setRequestProperty("Content-Type", mime)
                urlConnection.setRequestProperty("Content-Disposition", "attachment; filename=\"" + nameOnly.last() + "\"")
                urlConnection.setRequestProperty("Content-Length", attachment.size.toString())
                urlConnection.connect()
                val fileOutput = FileOutputStream(file)
                var decodedBytes = Base64.decode(attachment.contentsB64String, Base64.NO_WRAP)
                fileOutput.write(decodedBytes)
                fileOutput.close()
                var responseCode = urlConnection.getResponseCode()
                callback.sendData("")
             catch (e: MalformedURLException) 
                e.printStackTrace()
             catch (e: IOException) 
                e.printStackTrace()
            
            return ""
        
    
    async.execute()

但是为此我遇到了这个问题：

java.net.ProtocolException: content-length promised 318848 bytes, but received 0

我在这里遗漏了什么/弄错了什么？

【参考方案1】：

多次尝试后，在我的 AsyncTask 中使用它使其工作：

val url = URL(getURL(XelionOKHttpAPIRestLinks.UPLOAD_FILE.replace("__OID__", oid)))
            var baos = ByteArrayOutputStream()
            try 
                val urlConnection: HttpURLConnection = url.openConnection() as HttpURLConnection
                var nameOnly = attachment.commonName.split("/")
                urlConnection.setRequestMethod("POST")
                urlConnection.setDoInput(true)
                urlConnection.setDoOutput(true)
                urlConnection.setRequestProperty("Authorization", "xelion " + XelionPreferences.INSTANCE.authToken)
                urlConnection.setRequestProperty("Content-Type", mime)
                urlConnection.setRequestProperty("Content-Disposition", "attachment; filename=\"" + nameOnly.last() + "\"")
                urlConnection.connect()
                var decodedBytes = Base64.decode(attachment.contentsB64String, Base64.DEFAULT)
                urlConnection.getOutputStream().write(decodedBytes)

                val `is`: InputStream = urlConnection.getInputStream()
                val b = ByteArray(1024)

                while (`is`.read(b) !== -1) baos.write(b)

                urlConnection.disconnect()
                callback.sendData("")
             catch (e: MalformedURLException) 
                e.printStackTrace()
             catch (e: IOException) 
                e.printStackTrace()
            
            return ""

【参考方案2】：

我认为是关于getBytes()

使用时要小心，因为你必须传递字符编码参数，如.getBytes("UTF-8")

如果不传递任何参数，它将使用系统默认值。

请喜欢：

fileOutput.write("你的解码字符串".getBytes("UTF-8"));

【讨论】：

在哪里？我尝试了attachment.contentsB64String.getBytes("UTF-8")，但字符串的 getBytes 是“未解决的引用”。如果我在“decodedBytes”（这是一个 byte[] ）上尝试它也是一样的

我使用了：" var decodedBytes = attachment.contentsB64String.toByteArray(Charsets.UTF_8)" 但在 urlConnection.getResponseCode 上我仍然得到相同的 PROTOCOL EXCEPTION ERROR