使用POST和HttpURLConnection发送文件


124

由于Android开发人员建议使用HttpURLConnection该类,所以我想知道是否有人可以为我提供一个很好的示例,说明如何通过POST将位图“文件”(实际上是内存中的流)通过POST发送到Apache HTTP服务器。我对Cookie或身份验证或任何复杂的事物不感兴趣,但我只想拥有可靠的逻辑实现。我在这里看到的所有示例看起来都更像是“让我们尝试一下,也许行得通”。

现在,我有以下代码:

URL url;
HttpURLConnection urlConnection = null;
try {
    url = new URL("http://example.com/server.cgi");

    urlConnection = (HttpURLConnection) url.openConnection();

} catch (Exception e) {
    this.showDialog(getApplicationContext(), e.getMessage());
}
finally {
    if (urlConnection != null)
    {
        urlConnection.disconnect();
    }
}

在哪里showDialog应该只显示一个AlertDialog(如果URL无效?)。

现在,让我们说我生成了一个像这样的位图:Bitmap image = this.getBitmap()在派生自控件的控件中View,我想通过POST发送它。实现这种目标的正确程序是什么?我需要使用什么课程?我可以HttpPost此示例中使用吗?如果是这样,我将如何InputStreamEntity为我的位图构造?我会发现首先将位图存储在设备上的文件中是必需的。


我还应该提到,我确实需要将原始位图的所有未更改的像素发送到服务器,因此无法将其转换为JPEG。


Answers:


194

我不知道为什么HttpURLConnection该类没有提供任何方法来发送文件,而不必手动编写文件包装器。这就是我最终要做的,但是如果有人知道更好的解决方案,请告诉我。

输入数据:

Bitmap bitmap = myView.getBitmap();

静态内容:

String attachmentName = "bitmap";
String attachmentFileName = "bitmap.bmp";
String crlf = "\r\n";
String twoHyphens = "--";
String boundary =  "*****";

设置请求:

HttpURLConnection httpUrlConnection = null;
URL url = new URL("http://example.com/server.cgi");
httpUrlConnection = (HttpURLConnection) url.openConnection();
httpUrlConnection.setUseCaches(false);
httpUrlConnection.setDoOutput(true);

httpUrlConnection.setRequestMethod("POST");
httpUrlConnection.setRequestProperty("Connection", "Keep-Alive");
httpUrlConnection.setRequestProperty("Cache-Control", "no-cache");
httpUrlConnection.setRequestProperty(
    "Content-Type", "multipart/form-data;boundary=" + this.boundary);

启动内容包装器:

DataOutputStream request = new DataOutputStream(
    httpUrlConnection.getOutputStream());

request.writeBytes(this.twoHyphens + this.boundary + this.crlf);
request.writeBytes("Content-Disposition: form-data; name=\"" +
    this.attachmentName + "\";filename=\"" + 
    this.attachmentFileName + "\"" + this.crlf);
request.writeBytes(this.crlf);

转换BitmapByteBuffer

//I want to send only 8 bit black & white bitmaps
byte[] pixels = new byte[bitmap.getWidth() * bitmap.getHeight()];
for (int i = 0; i < bitmap.getWidth(); ++i) {
    for (int j = 0; j < bitmap.getHeight(); ++j) {
        //we're interested only in the MSB of the first byte, 
        //since the other 3 bytes are identical for B&W images
        pixels[i + j] = (byte) ((bitmap.getPixel(i, j) & 0x80) >> 7);
    }
}

request.write(pixels);

最终内容包装器:

request.writeBytes(this.crlf);
request.writeBytes(this.twoHyphens + this.boundary + 
    this.twoHyphens + this.crlf);

刷新输出缓冲区:

request.flush();
request.close();

得到回应:

InputStream responseStream = new 
    BufferedInputStream(httpUrlConnection.getInputStream());

BufferedReader responseStreamReader = 
    new BufferedReader(new InputStreamReader(responseStream));

String line = "";
StringBuilder stringBuilder = new StringBuilder();

while ((line = responseStreamReader.readLine()) != null) {
    stringBuilder.append(line).append("\n");
}
responseStreamReader.close();

String response = stringBuilder.toString();

关闭响应流:

responseStream.close();

关闭连接:

httpUrlConnection.disconnect();

PS:当然,我必须将请求包装在中private class AsyncUploadBitmaps extends AsyncTask<Bitmap, Void, String>,以使Android平台满意,因为它不希望在主线程上有网络请求。


6
最后,这个问题的答案得到了完美的解释!谢谢!顺便说一句,我刚刚从Android开发者博客(android-developers.blogspot.com/2011/09/…)找到了这篇文章,他们建议在Apache HTTPClient上使用HTTPURLConnection。干杯!
安德烈斯帕琼

PS:根据这个,`[错误] => 3`意味着“上传文件只有部分被上传”,因此我可以假设,有一些缓冲的问题,但我不知道如何调试/修复这样的事情。
Mihai Todor 2014年

1
请参阅上方我的评论。您需要将它们添加到url变量中,如下所示:URL url = new URL("http://example.com/?param1=val1&param2=val2");。您可以根据需要添加任意数量(尽管我认为有一些限制)。
Mihai Todor

太好了,只是错过了一件事:应该在try / catch的最后关闭responseStreamReader。这种方式:尝试{所有代码} catch(IOException e){e.printStackTrace(); }最后{如果(connection!= null)connection.disconnect(); 尝试{如果(responseStreamReader!= null)responseStreamReader.close(); } catch(IOException e){e.printStackTrace(); }
弗洛里安(FlorianB)

2
完美的答案!我建议看一下有关表单的w3.org文档
pippo

68

我实际上找到了一种使用MultipartEntity使用HttpURLConnection发送文件的更好方法

private static String multipost(String urlString, MultipartEntity reqEntity) {
    try {
        URL url = new URL(urlString);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setReadTimeout(10000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("POST");
        conn.setUseCaches(false);
        conn.setDoInput(true);
        conn.setDoOutput(true);

        conn.setRequestProperty("Connection", "Keep-Alive");
        conn.addRequestProperty("Content-length", reqEntity.getContentLength()+"");
        conn.addRequestProperty(reqEntity.getContentType().getName(), reqEntity.getContentType().getValue());

        OutputStream os = conn.getOutputStream();
        reqEntity.writeTo(conn.getOutputStream());
        os.close();
        conn.connect();

        if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
            return readStream(conn.getInputStream());
        }

    } catch (Exception e) {
        Log.e(TAG, "multipart post error " + e + "(" + urlString + ")");
    }
    return null;        
}

private static String readStream(InputStream in) {
    BufferedReader reader = null;
    StringBuilder builder = new StringBuilder();
    try {
        reader = new BufferedReader(new InputStreamReader(in));
        String line = "";
        while ((line = reader.readLine()) != null) {
            builder.append(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return builder.toString();
} 

假设您要上传带有位图数据的图像:

    Bitmap bitmap = ...;
    String filename = "filename.png";
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
    ContentBody contentPart = new ByteArrayBody(bos.toByteArray(), filename);

    MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
    reqEntity.addPart("picture", contentPart);
    String response = multipost("http://server.com", reqEntity);

和瞧!您的帖子数据将包含图片字段以及服务器上的文件名和路径。


1
我注意到您没有调用conn.disconnect(),这是故意的吗?
jerrytouille

1
@MihaiTodor您将需要将位图压缩到文件中,以减少通过网络传输的数据量。
隐身直升机2013年

5
您应该调用setFixedLengthStreamingMode(reqEntity.getContentLength()),而不是直接设置Content-Length标头。这样,您的数据就不会在套接字上发送之前被缓冲(至少在较新的设备上,在Android 2.3或更低版本上,无论如何似乎它们都会被缓冲)。我通过使用okhttp作为传输方式修复了旧设备上的缓冲问题,并且可以正常工作。
马特·沃尔夫

16
太糟糕MultipartEntity不与Android SDK捆绑
mente

2
@mente它与httpmime捆绑在一起。我将其用作Gradle依赖项:org.apache.httpcomponents:httpmime:4.1.1
david.perez 2014年

63

使用MultipartUtility简单的方法使用某些参数将文件上传到服务器上。

MultipartUtility.java

public class MultipartUtility {

    private final String boundary;
    private static final String LINE_FEED = "\r\n";
    private HttpURLConnection httpConn;
    private String charset;
    private OutputStream outputStream;
    private PrintWriter writer;

    /**
     * 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)
            throws IOException {
        this.charset = charset;

        // creates a unique boundary based on time stamp
        boundary = "===" + System.currentTimeMillis() + "===";

        URL url = new URL(requestURL);
        Log.e("URL", "URL : " + requestURL.toString());
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true); // indicates POST method
        httpConn.setDoInput(true);
        httpConn.setRequestProperty("Content-Type",
                "multipart/form-data; boundary=" + boundary);
        httpConn.setRequestProperty("User-Agent", "CodeJava Agent");
        httpConn.setRequestProperty("Test", "Bonjour");
        outputStream = httpConn.getOutputStream();
        writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
                true);
    }

    /**
     * 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 <input type="file" name="..." />
     * @param uploadFile a File to be uploaded
     * @throws IOException
     */
    public void addFilePart(String fieldName, File uploadFile)
            throws IOException {
        String fileName = uploadFile.getName();
        writer.append("--" + boundary).append(LINE_FEED);
        writer.append(
                "Content-Disposition: form-data; name=\"" + fieldName
                        + "\"; filename=\"" + fileName + "\"")
                .append(LINE_FEED);
        writer.append(
                "Content-Type: "
                        + URLConnection.guessContentTypeFromName(fileName))
                .append(LINE_FEED);
        writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
        writer.append(LINE_FEED);
        writer.flush();

        FileInputStream inputStream = new FileInputStream(uploadFile);
        byte[] buffer = new byte[4096];
        int bytesRead = -1;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        outputStream.flush();
        inputStream.close();

        writer.append(LINE_FEED);
        writer.flush();
    }

    /**
     * Adds a header field to the request.
     *
     * @param name  - name of the header field
     * @param value - value of the header field
     */
    public void addHeaderField(String name, String value) {
        writer.append(name + ": " + value).append(LINE_FEED);
        writer.flush();
    }

    /**
     * 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 String finish() throws IOException {
        StringBuffer response = new StringBuffer();

        writer.append(LINE_FEED).flush();
        writer.append("--" + boundary + "--").append(LINE_FEED);
        writer.close();

        // checks server's status code first
        int status = httpConn.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpConn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }

        return response.toString();
    }
}

uploadfile参数。

注意:将此代码放在下面的非ui线程中以获得响应。

String charset = "UTF-8";
String requestURL = "YOUR_URL";

MultipartUtility multipart = new MultipartUtility(requestURL, charset);
multipart.addFormField("param_name_1", "param_value");
multipart.addFormField("param_name_2", "param_value");
multipart.addFormField("param_name_3", "param_value");
multipart.addFilePart("file_param_1", new File(file_path));
String response = multipart.finish(); // response from server.

14

Jaydipsinh Zala的解决方案对我没有用,我不知道为什么,但是它似乎很接近解决方案。

因此,将这一课程与Mihai Todor的出色解决方案和说明相结合,结果是该课程目前对我有用。如果它可以帮助某人:

MultipartUtility2V.java

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.file.Files;

public class MultipartUtilityV2 {
    private HttpURLConnection httpConn;
    private DataOutputStream request;
    private final String boundary =  "*****";
    private final String crlf = "\r\n";
    private final String twoHyphens = "--";

    /**
     * This constructor initializes a new HTTP POST request with content type
     * is set to multipart/form-data
     *
     * @param requestURL
     * @throws IOException
     */
    public MultipartUtilityV2(String requestURL)
            throws IOException {

        // creates a unique boundary based on time stamp
        URL url = new URL(requestURL);
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true); // indicates POST method
        httpConn.setDoInput(true);

        httpConn.setRequestMethod("POST");
        httpConn.setRequestProperty("Connection", "Keep-Alive");
        httpConn.setRequestProperty("Cache-Control", "no-cache");
        httpConn.setRequestProperty(
                "Content-Type", "multipart/form-data;boundary=" + this.boundary);

        request =  new DataOutputStream(httpConn.getOutputStream());
    }

    /**
     * Adds a form field to the request
     *
     * @param name  field name
     * @param value field value
     */
    public void addFormField(String name, String value)throws IOException  {
        request.writeBytes(this.twoHyphens + this.boundary + this.crlf);
        request.writeBytes("Content-Disposition: form-data; name=\"" + name + "\""+ this.crlf);
        request.writeBytes("Content-Type: text/plain; charset=UTF-8" + this.crlf);
        request.writeBytes(this.crlf);
        request.writeBytes(value+ this.crlf);
        request.flush();
    }

    /**
     * Adds a upload file section to the request
     *
     * @param fieldName  name attribute in <input type="file" name="..." />
     * @param uploadFile a File to be uploaded
     * @throws IOException
     */
    public void addFilePart(String fieldName, File uploadFile)
            throws IOException {
        String fileName = uploadFile.getName();
        request.writeBytes(this.twoHyphens + this.boundary + this.crlf);
        request.writeBytes("Content-Disposition: form-data; name=\"" +
                fieldName + "\";filename=\"" +
                fileName + "\"" + this.crlf);
        request.writeBytes(this.crlf);

        byte[] bytes = Files.readAllBytes(uploadFile.toPath());
        request.write(bytes);
    }

    /**
     * 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 String finish() throws IOException {
        String response ="";

        request.writeBytes(this.crlf);
        request.writeBytes(this.twoHyphens + this.boundary +
                this.twoHyphens + this.crlf);

        request.flush();
        request.close();

        // checks server's status code first
        int status = httpConn.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            InputStream responseStream = new
                    BufferedInputStream(httpConn.getInputStream());

            BufferedReader responseStreamReader =
                    new BufferedReader(new InputStreamReader(responseStream));

            String line = "";
            StringBuilder stringBuilder = new StringBuilder();

            while ((line = responseStreamReader.readLine()) != null) {
                stringBuilder.append(line).append("\n");
            }
            responseStreamReader.close();

            response = stringBuilder.toString();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }

        return response;
    }
}

1
这是仅对我有效的解决方案。非常感谢你。
Yucel Bayram

3

这个答案https://stackoverflow.com/a/33149413/6481542使我可以将90%的大型文件上传到开发Django服务器,但是我必须使用setFixedLengthStreamingMode使其工作。这要求在写入内容之前设置Content-Length,因此需要对上述答案进行相当大的重写。这是我的最终结果

public class MultipartLargeUtility {
    private final String boundary;
    private static final String LINE_FEED = "\r\n";
    private HttpURLConnection httpConn;
    private String charset;
    private OutputStream outputStream;
    private PrintWriter writer;
    private final int maxBufferSize = 4096;
    private long contentLength = 0;
    private URL url;

    private List<FormField> fields;
    private List<FilePart> files;

    private class FormField {
        public String name;
        public String value;

        public FormField(String name, String value) {
            this.name = name;
            this.value = value;
        }
    }

    private class FilePart {
        public String fieldName;
        public File uploadFile;

        public FilePart(String fieldName, File uploadFile) {
            this.fieldName = fieldName;
            this.uploadFile = uploadFile;
        }
    }

    /**
     * This constructor initializes a new HTTP POST request with content type
     * is set to multipart/form-data
     *
     * @param requestURL
     * @param charset
     * @throws IOException
     */
    public MultipartLargeUtility(String requestURL, String charset, boolean requireCSRF)
            throws IOException {
        this.charset = charset;

        // creates a unique boundary based on time stamp
        boundary = "===" + System.currentTimeMillis() + "===";
        url = new URL(requestURL);
        fields = new ArrayList<>();
        files = new ArrayList<>();

        if (requireCSRF) {
            getCSRF();
        }
    }

    /**
     * Adds a form field to the request
     *
     * @param name  field name
     * @param value field value
     */
    public void addFormField(String name, String value)
            throws UnsupportedEncodingException {
        String fieldContent = "--" + boundary + LINE_FEED;
        fieldContent += "Content-Disposition: form-data; name=\"" + name + "\"" + LINE_FEED;
        fieldContent += "Content-Type: text/plain; charset=" + charset + LINE_FEED;
        fieldContent += LINE_FEED;
        fieldContent += value + LINE_FEED;
        contentLength += fieldContent.getBytes(charset).length;
        fields.add(new FormField(name, value));
    }

    /**
     * Adds a upload file section to the request
     *
     * @param fieldName  name attribute in <input type="file" name="..." />
     * @param uploadFile a File to be uploaded
     * @throws IOException
     */
    public void addFilePart(String fieldName, File uploadFile)
            throws IOException {
        String fileName = uploadFile.getName();

        String fieldContent = "--" + boundary + LINE_FEED;
        fieldContent += "Content-Disposition: form-data; name=\"" + fieldName
                + "\"; filename=\"" + fileName + "\"" + LINE_FEED;
        fieldContent += "Content-Type: "
                + URLConnection.guessContentTypeFromName(fileName) + LINE_FEED;
        fieldContent += "Content-Transfer-Encoding: binary" + LINE_FEED;
        fieldContent += LINE_FEED;
        // file content would go here
        fieldContent += LINE_FEED;
        contentLength += fieldContent.getBytes(charset).length;
        contentLength += uploadFile.length();
        files.add(new FilePart(fieldName, uploadFile));
    }

    /**
     * Adds a header field to the request.
     *
     * @param name  - name of the header field
     * @param value - value of the header field
     */
    //public void addHeaderField(String name, String value) {
    //    writer.append(name + ": " + value).append(LINE_FEED);
    //    writer.flush();
    //}

    /**
     * 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 List<String> finish() throws IOException {
        List<String> response = new ArrayList<String>();
        String content = "--" + boundary + "--" + LINE_FEED;
        contentLength += content.getBytes(charset).length;

        if (!openConnection()) {
            return response;
        }

        writeContent();

        // checks server's status code first
        int status = httpConn.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpConn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                response.add(line);
            }
            reader.close();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }
        return response;
    }

    private boolean getCSRF()
            throws IOException {
        /// First, need to get CSRF token from server
        /// Use GET request to get the token
        CookieManager cookieManager = new CookieManager();
        CookieHandler.setDefault(cookieManager);
        HttpURLConnection conn = null;

        conn = (HttpURLConnection) url.openConnection();

        conn.setUseCaches(false); // Don't use a Cached Copy
        conn.setRequestMethod("GET");
        conn.setRequestProperty("Connection", "Keep-Alive");
        conn.getContent();
        conn.disconnect();

        /// parse the returned object for the CSRF token
        CookieStore cookieJar = cookieManager.getCookieStore();
        List<HttpCookie> cookies = cookieJar.getCookies();
        String csrf = null;
        for (HttpCookie cookie : cookies) {
            Log.d("cookie", "" + cookie);
            if (cookie.getName().equals("csrftoken")) {
                csrf = cookie.getValue();
                break;
            }
        }
        if (csrf == null) {
            Log.d(TAG, "Unable to get CSRF");
            return false;
        }
        Log.d(TAG, "Received cookie: " + csrf);

        addFormField("csrfmiddlewaretoken", csrf);
        return true;
    }

    private boolean openConnection()
            throws IOException {
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true);    // indicates POST method
        httpConn.setDoInput(true);
        //httpConn.setRequestProperty("Accept-Encoding", "identity");
        httpConn.setFixedLengthStreamingMode(contentLength);
        httpConn.setRequestProperty("Connection", "Keep-Alive");
        httpConn.setRequestProperty("Content-Type",
                "multipart/form-data; boundary=" + boundary);
        outputStream = new BufferedOutputStream(httpConn.getOutputStream());
        writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
                true);
        return true;
    }

    private void writeContent()
            throws IOException {

        for (FormField field : fields) {
            writer.append("--" + boundary).append(LINE_FEED);
            writer.append("Content-Disposition: form-data; name=\"" + field.name + "\"")
                    .append(LINE_FEED);
            writer.append("Content-Type: text/plain; charset=" + charset).append(
                    LINE_FEED);
            writer.append(LINE_FEED);
            writer.append(field.value).append(LINE_FEED);
            writer.flush();
        }

        for (FilePart filePart : files) {
            String fileName = filePart.uploadFile.getName();
            writer.append("--" + boundary).append(LINE_FEED);
            writer.append(
                    "Content-Disposition: form-data; name=\"" + filePart.fieldName
                            + "\"; filename=\"" + fileName + "\"")
                    .append(LINE_FEED);
            writer.append(
                    "Content-Type: "
                            + URLConnection.guessContentTypeFromName(fileName))
                    .append(LINE_FEED);
            writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
            writer.append(LINE_FEED);
            writer.flush();

            FileInputStream inputStream = new FileInputStream(filePart.uploadFile);
            int bufferSize = Math.min(inputStream.available(), maxBufferSize);
            byte[] buffer = new byte[bufferSize];
            int bytesRead = -1;
            while ((bytesRead = inputStream.read(buffer, 0, bufferSize)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            outputStream.flush();
            inputStream.close();
            writer.append(LINE_FEED);
            writer.flush();
        }

        writer.append("--" + boundary + "--").append(LINE_FEED);
        writer.close();
    }
}

用法与上面的答案基本相同,但是我包括了Django默认使用的CSRF支持形式

boolean useCSRF = true;
MultipartLargeUtility multipart = new MultipartLargeUtility(url, "UTF-8",useCSRF);
multipart.addFormField("param1","value");
multipart.addFilePart("filefield",new File("/path/to/file"));
List<String> response = multipart.finish();
Log.w(TAG,"SERVER REPLIED:");
for(String line : response) {
    Log.w(TAG, "Upload Files Response:::" + line);
}

2

基于Mihai的解决方案,如果有人像我的服务器上发生的那样在服务器上保存图像有问题。将位图的字节缓冲区部分更改为:

ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG,100,bos);
        byte[] pixels = bos.toByteArray();

1

我尚未对此进行测试,但是您可以尝试使用PipedInputStream和PipedOutputStream。它可能看起来像:

final Bitmap bmp =  // your bitmap

// Set up Piped streams
final PipedOutputStream pos = new PipedOutputStream(new ByteArrayOutputStream());
final PipedInputStream pis = new PipedInputStream(pos);

// Send bitmap data to the PipedOutputStream in a separate thread
new Thread() {
    public void run() {
        bmp.compress(Bitmap.CompressFormat.PNG, 100, pos);
    }
}.start();

// Send POST request
try {
    // Construct InputStreamEntity that feeds off of the PipedInputStream
    InputStreamEntity reqEntity = new InputStreamEntity(pis, -1);

    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(url);
    reqEntity.setContentType("binary/octet-stream");
    reqEntity.setChunked(true);
    httppost.setEntity(reqEntity);
    HttpResponse response = httpclient.execute(httppost);
} catch (Exception e) {
    e.printStackTrace()
}

0

这是我使用帖子请求上传照片的方法。

public void uploadFile(int directoryID, String filePath) {
    Bitmap bitmapOrg = BitmapFactory.decodeFile(filePath);
    ByteArrayOutputStream bao = new ByteArrayOutputStream();

    String upload_url = BASE_URL + UPLOAD_FILE;
    bitmapOrg.compress(Bitmap.CompressFormat.JPEG, 90, bao);

    byte[] data = bao.toByteArray();

    HttpClient httpClient = new DefaultHttpClient();
    HttpPost postRequest = new HttpPost(upload_url);
    MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);

    try {
        // Set Data and Content-type header for the image
        FileBody fb = new FileBody(new File(filePath), "image/jpeg");
        StringBody contentString = new StringBody(directoryID + "");

        entity.addPart("file", fb);
        entity.addPart("directory_id", contentString);
        postRequest.setEntity(entity);

        HttpResponse response = httpClient.execute(postRequest);
        // Read the response
        String jsonString = EntityUtils.toString(response.getEntity());
        Log.e("response after uploading file ", jsonString);

    } catch (Exception e) {
        Log.e("Error in uploadFile", e.getMessage());
    }
}

注意:此代码需要库,因此请按照此处的说明进行操作以获取库。


2
很高兴知道有一种方法可以利用最新版本的HttpClient(您的链接已过时。请改用版本),Android家伙只是为了向后兼容而保留,而不是使用内置的HttpURLConnection。另一方面,似乎需要更多的工作来设置它,所以这也许不值得。
Mihai Todor 2014年


0

我尝试了上面的解决方案,但没有一个对我有用。

但是http://www.baeldung.com/httpclient-post-http-request。第6行POST多部分请求可在几秒钟内完成

public void whenSendMultipartRequestUsingHttpClient_thenCorrect() 
  throws ClientProtocolException, IOException {
    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost("http://www.example.com");

    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    builder.addTextBody("username", "John");
    builder.addTextBody("password", "pass");
    builder.addBinaryBody("file", new File("test.txt"),
      ContentType.APPLICATION_OCTET_STREAM, "file.ext");

    HttpEntity multipart = builder.build();
    httpPost.setEntity(multipart);

    CloseableHttpResponse response = client.execute(httpPost);
    client.close();
}
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