java – Android：使用HttpURLConnection中的进度回调在Cloudinary中上传照片

概述我正在尝试修改cloudinary的开源库,以便我可以收听上传照片的进度.库类包含一个MultipartUtility java类,我修改它以监听上载的进度. 修改前的原始代码可以在github：https://github.com/cloudinary/cloudinary_java/blob/master/cloudinary-android/src/main/java/com/cloudin 我正在尝试修改cloudinary的开源库,以便我可以收听上传照片的进度.库类包含一个MultipartUtility java类,我修改它以监听上载的进度.

修改前的原始代码可以在github：https://github.com/cloudinary/cloudinary_java/blob/master/cloudinary-android/src/main/java/com/cloudinary/android/MultipartUtility.java上找到

我将其修改为类似于另一个云服务CloudFS的代码,该代码在上传文件/图像等时支持进度：

https://github.com/bitcasa/CloudFS-Android/blob/master/app/src/main/java/com/bitcasa/cloudfs/api/MultipartUpload.java

package com.cloudinary.androID;import com.cloudinary.Cloudinary;import java.io.*;import java.net.httpURLConnection;import java.net.URL;import java.util.Map;/** * This utility class provIDes an abstraction layer for sending multipart http * POST requests to a web server. * * @author www.codejava.net * @author Cloudinary */public class MultipartUtility {    private final String boundary;    private static final String liNE_Feed = "\r\n";    private static final String APPliCATION_OCTET_STREAM = "application/octet-stream";    private httpURLConnection httpConn;    private String charset;    private OutputStream outputStream;    private PrintWriter writer;    UploadingCallback uploadingCallback;    public final static String USER_AGENT = "CloudinaryAndroID/" + Cloudinary.VERSION;    Long filesize;    public voID setUploadingCallback(UploadingCallback uploadingCallback) {        this.uploadingCallback = uploadingCallback;    }    /**     * This constructor initializes a new http POST request with content type is     * set to multipart/form-data     *     * @param requestURL     * @param charset     * @throws IOException     */    public MultipartUtility(String requestURL,String charset,String boundary,Map<String,String> headers,Long filesize) throws IOException {        this.charset = charset;        this.boundary = boundary;        this.filesize = filesize;        URL url = new URL(requestURL);        httpConn = (httpURLConnection) url.openConnection();        httpConn.setDoOutput(true); // indicates POST method        httpConn.setDoinput(true);        httpConn.setFixedLengthStreamingMode(filesize); //added this in        if (headers != null) {            for (Map.Entry<String,String> header : headers.entrySet()) {                httpConn.setRequestProperty(header.getKey(),header.getValue());            }        }        httpConn.setRequestProperty("Content-Type","multipart/form-data; boundary=" + boundary);        httpConn.setRequestProperty("User-Agent",USER_AGENT);        outputStream = httpConn.getoutputStream();        writer = new PrintWriter(new OutputStreamWriter(outputStream,charset),true);    }    public MultipartUtility(String requestURL,String boundary) throws IOException {        this(requestURL,charset,boundary,null,0L);    }    /**     * Adds a form fIEld to the request     *     * @param name  fIEld name     * @param value fIEld value     */    public voID addFormFIEld(String name,String value) {        writer.append("--" + boundary).append(liNE_Feed);        writer.append("Content-disposition: form-data; name=\"" + name + "\"").append(liNE_Feed);        writer.append("Content-Type: text/plain; charset=" + charset).append(liNE_Feed);        writer.append(liNE_Feed);        writer.append(value).append(liNE_Feed);        writer.flush();    }    /**     * Adds a upload file section to the request     *     * @param fIEldname  name attribute in {@code <input type="file" name="..." />}     * @param uploadfile a file to be uploaded     * @throws IOException     */    public voID addfilePart(String fIEldname,file uploadfile,String filename) throws IOException {        if (filename == null) filename = uploadfile.getname();        fileinputStream inputStream = new fileinputStream(uploadfile);        addfilePart(fIEldname,inputStream,filename);    }    public voID addfilePart(String fIEldname,file uploadfile) throws IOException {        addfilePart(fIEldname,uploadfile,"file");    }    public voID addfilePart(String fIEldname,inputStream inputStream,String filename) throws IOException {        if (filename == null) filename = "file";        writer.append("--" + boundary).append(liNE_Feed);        writer.append("Content-disposition: form-data; name=\"" + fIEldname + "\"; filename=\"" + filename + "\"").append(liNE_Feed);        writer.append("Content-Type: ").append(APPliCATION_OCTET_STREAM).append(liNE_Feed);        writer.append("Content-transfer-encoding: binary").append(liNE_Feed);        writer.append(liNE_Feed);        writer.flush();        int progress = 0;        byte[] buffer = new byte[4096];        int bytesRead = -1;        while ((bytesRead = inputStream.read(buffer)) != -1) {            outputStream.write(buffer,bytesRead);            progress += bytesRead;/*            int percentage = ((progress / filesize.intValue()) * 100);*/            if (uploadingCallback != null) {                uploadingCallback.uploadListener(progress);            }        }        outputStream.flush();        writer.flush();        uploadingCallback = null;        inputStream.close();        writer.append(liNE_Feed);        writer.flush();    }    public voID addfilePart(String fIEldname,inputStream inputStream) throws IOException {        addfilePart(fIEldname,"file");    }    /**     * Completes the request and receives response from the server.     *     * @return a List of Strings as response in case the server returned status     * OK,otherwise an exception is thrown.     * @throws IOException     */    public httpURLConnection execute() throws IOException {        writer.append("--" + boundary + "--").append(liNE_Feed);        writer.close();        return httpConn;    }}

我所做的更改是按照此线程的建议将以下内容添加到httpURLConnection：How to implement file upload progress bar in android：httpConn.setFixedLengthStreamingMode(filesize);

然后我创建了一个简单的界面来监听上传进度：

public interface UploadingCallback {    voID uploadListener(int progress);}

然后我在httpURLConnection写下照片时附上它：

while ((bytesRead = inputStream.read(buffer)) != -1) {            outputStream.write(buffer,bytesRead);            progress += bytesRead;/*            int percentage = ((progress / filesize.intValue()) * 100);*/            if (uploadingCallback != null) {                uploadingCallback.uploadListener(progress);            }        }

代码已运行,但上传的进度似乎没有正确测量.这张照片大概是365kb,上传时间大约是十分之一秒(我开始上传时间为17：56：55.481,17：56：55.554已完成上传,这只是超过0.7秒).我不相信我的互联网连接速度很快,并且预计它至少需要5秒钟.我感觉它正在测量将照片写入缓冲区所花费的时间,而不是将它发送到cloudinary服务器所花费的时间.

我怎样才能测量上传照片所需的时间,以便我可以将数据用于进度条？

04-24 17:56:55.481 28306-28725/com.a  upload  409604-24 17:56:55.486 28306-28725/com.a  upload  819204-24 17:56:55.486 28306-28725/com.a  upload  1228804-24 17:56:55.486 28306-28725/com.a  upload  1638404-24 17:56:55.487 28306-28725/com.a  upload  2048004-24 17:56:55.487 28306-28725/com.a  upload  2457604-24 17:56:55.487 28306-28725/com.a  upload  2867204-24 17:56:55.487 28306-28725/com.a  upload  3276804-24 17:56:55.491 28306-28725/com.a  upload  3686404-24 17:56:55.492 28306-28725/com.a  upload  4096004-24 17:56:55.493 28306-28725/com.a  upload  4505604-24 17:56:55.493 28306-28725/com.a  upload  4915204-24 17:56:55.493 28306-28725/com.a  upload  5324804-24 17:56:55.493 28306-28725/com.a  upload  5734404-24 17:56:55.494 28306-28725/com.a  upload  6144004-24 17:56:55.494 28306-28725/com.a  upload  6553604-24 17:56:55.494 28306-28725/com.a  upload  6963204-24 17:56:55.494 28306-28725/com.a  upload  7372804-24 17:56:55.494 28306-28725/com.a  upload  7782404-24 17:56:55.495 28306-28725/com.a  upload  8192004-24 17:56:55.495 28306-28725/com.a  upload  8601604-24 17:56:55.495 28306-28725/com.a  upload  9011204-24 17:56:55.495 28306-28725/com.a  upload  9420804-24 17:56:55.495 28306-28725/com.a  upload  9830404-24 17:56:55.495 28306-28725/com.a  upload  10240004-24 17:56:55.495 28306-28725/com.a  upload  10649604-24 17:56:55.496 28306-28725/com.a  upload  11059204-24 17:56:55.496 28306-28725/com.a  upload  11468804-24 17:56:55.496 28306-28725/com.a  upload  11878404-24 17:56:55.497 28306-28725/com.a  upload  12288004-24 17:56:55.498 28306-28725/com.a  upload  12697604-24 17:56:55.498 28306-28725/com.a  upload  13107204-24 17:56:55.498 28306-28725/com.a  upload  13516804-24 17:56:55.498 28306-28725/com.a  upload  13926404-24 17:56:55.499 28306-28725/com.a  upload  14336004-24 17:56:55.506 28306-28725/com.a  upload  14745604-24 17:56:55.510 28306-28725/com.a  upload  15155204-24 17:56:55.510 28306-28725/com.a  upload  15564804-24 17:56:55.514 28306-28725/com.a  upload  15974404-24 17:56:55.515 28306-28725/com.a  upload  16384004-24 17:56:55.517 28306-28725/com.a  upload  16793604-24 17:56:55.517 28306-28725/com.a  upload  17203204-24 17:56:55.518 28306-28725/com.a  upload  17612804-24 17:56:55.518 28306-28725/com.a  upload  18022404-24 17:56:55.518 28306-28725/com.a  upload  18432004-24 17:56:55.519 28306-28725/com.a  upload  18841604-24 17:56:55.519 28306-28725/com.a  upload  19251204-24 17:56:55.519 28306-28725/com.a  upload  19660804-24 17:56:55.519 28306-28725/com.a  upload  20070404-24 17:56:55.520 28306-28725/com.a  upload  20480004-24 17:56:55.525 28306-28725/com.a  upload  20889604-24 17:56:55.526 28306-28725/com.a  upload  21299204-24 17:56:55.527 28306-28725/com.a  upload  21708804-24 17:56:55.530 28306-28725/com.a  upload  22118404-24 17:56:55.530 28306-28725/com.a  upload  22528004-24 17:56:55.530 28306-28725/com.a  upload  22937604-24 17:56:55.530 28306-28725/com.a  upload  23347204-24 17:56:55.530 28306-28725/com.a  upload  23756804-24 17:56:55.531 28306-28725/com.a  upload  24166404-24 17:56:55.532 28306-28725/com.a  upload  24576004-24 17:56:55.532 28306-28725/com.a  upload  24985604-24 17:56:55.532 28306-28725/com.a  upload  25395204-24 17:56:55.533 28306-28725/com.a  upload  25804804-24 17:56:55.533 28306-28725/com.a  upload  26214404-24 17:56:55.535 28306-28725/com.a  upload  26624004-24 17:56:55.540 28306-28725/com.a  upload  27033604-24 17:56:55.540 28306-28725/com.a  upload  27443204-24 17:56:55.541 28306-28725/com.a  upload  27852804-24 17:56:55.541 28306-28725/com.a  upload  28262404-24 17:56:55.543 28306-28725/com.a  upload  28672004-24 17:56:55.545 28306-28725/com.a  upload  29081604-24 17:56:55.545 28306-28725/com.a  upload  29491204-24 17:56:55.547 28306-28725/com.a  upload  29900804-24 17:56:55.547 28306-28725/com.a  upload  30310404-24 17:56:55.547 28306-28725/com.a  upload  30720004-24 17:56:55.547 28306-28725/com.a  upload  31129604-24 17:56:55.547 28306-28725/com.a  upload  31539204-24 17:56:55.548 28306-28725/com.a  upload  31948804-24 17:56:55.548 28306-28725/com.a  upload  32358404-24 17:56:55.548 28306-28725/com.a  upload  32768004-24 17:56:55.548 28306-28725/com.a  upload  33177604-24 17:56:55.549 28306-28725/com.a  upload  33587204-24 17:56:55.549 28306-28725/com.a  upload  33996804-24 17:56:55.549 28306-28725/com.a  upload  34406404-24 17:56:55.550 28306-28725/com.a  upload  34816004-24 17:56:55.550 28306-28725/com.a  upload  35225604-24 17:56:55.551 28306-28725/com.a  upload  35635204-24 17:56:55.551 28306-28725/com.a  upload  36044804-24 17:56:55.552 28306-28725/com.a  upload  36454404-24 17:56:55.554 28306-28725/com.a  upload  365790

要自己测试一下,您需要在cloudinary网站上创建一个免费帐户以获取您的云端名称,这样您就可以将AndroID SDK连接到他们的服务,从而直接从AndroID直接上传到他们的服务器.

编辑：

这是我尝试过的,当上传实际在7秒内完成时,它仍然会在0.7秒内从0 – 100％跳跃：

while ((bytesRead = inputStream.read(buffer)) != -1) {        outputStream.write(buffer,bytesRead);        progress += bytesRead;        Log.d("MultiPart","file transferred so far: "                + progress);        if (uploadingCallback != null) {            uploadingCallback.uploadListener(progress);        }        Log.d("Flushing","flush the writer");        outputStream.flush();        writer.flush();    }

解决方法 使用flush()方法和调用update callback()的时间有问题.

每次读取部分图片时都可以从代码中看到,将其写入输出缓冲区,但这并不意味着它被发送到服务器,它可能被缓冲,然后写入服务器.

你有两个选择,在每个outputStream.write()之后调用outputStream.flush(),但这会杀死上传的性能,因为你会失去缓冲的好处.

或者,您可以在方法结束时的outputStream.flush()之后调用updateCallback().因为在outputStream.flush()之后,您确定数据在服务器上,并且该进度已结束.

有关flush的更多信息,请参阅此主题What is the purpose of flush() in Java streams?

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