使用HttpURLConnection上传多个图像文件

Question

使用HttpURLConnection上传多个图像文件

9

我想使用HttpURLConnection上传多个图片文件，并且可以从Android上传任意数量的图片。请不要发送MultiPartEntity的链接，我只想使用HttpURLConnection完成此操作，并且不想使用任何其他外部库来上传文件。例如，我想通过HTTPUrlConnection上传文件，请参考此链接：http://www.17od.com/2010/02/18/multipart-form-upload-on-android/，这是单个文件上传代码，我想上传多个文件。请提供php脚本的示例。

- akhil batlawala

1

尝试使用HttpURLConnection访问http://www.codejava.net/java-se/networking/upload-files-by-sending-multipart-request-programmatically。 - Hiren Dabhi

但是PHP的实现方式是什么？ - akhil batlawala

1

这些链接都是在服务器端进行单个文件上传的。我将一次性向服务器发送多个图像文件，那么我该如何保存到服务器呢？ - akhil batlawala

1

请查看此链接：http://stackoverflow.com/questions/16069837/php-get-names-of-multiple-uploaded-files - Hiren Dabhi

抱歉，我尝试了但是没有起作用。 - akhil batlawala

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1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- akhil batlawala · Accepted Answer

是的，终于我得到了答案。

在安卓端。

Fileuploader.java

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

    public FileUploader(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);
        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 List<String> finish() throws IOException {
        List<String> response = new ArrayList<String>();

        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.add(line);
            }
            reader.close();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }

        return response;
    }
}

在MainActivity文件中

在MainActivity.java文件中，只需调用此函数，imgPaths是图像路径的数组。

 public void uploadFile(ArrayList<String> imgPaths) {

        String charset = "UTF-8";
        //File uploadFile1 = new File("e:/Test/PIC1.JPG");
        //File uploadFile2 = new File("e:/Test/PIC2.JPG");

        File sourceFile[] = new File[imgPaths.size()];
        for (int i=0;i<imgPaths.size();i++){
            sourceFile[i] = new File(imgPaths.get(i));
           // Toast.makeText(getApplicationContext(),imgPaths.get(i),Toast.LENGTH_SHORT).show();
        }

        String requestURL = "your API";

        try {
            FileUploader multipart = new FileUploader(requestURL, charset);

            multipart.addHeaderField("User-Agent", "CodeJava");
            multipart.addHeaderField("Test-Header", "Header-Value");

            multipart.addFormField("description", "Cool Pictures");
            multipart.addFormField("keywords", "Java,upload,Spring");

            for (int i=0;i<imgPaths.size();i++){
                multipart.addFilePart("uploaded_file[]", sourceFile[i]);
            }

            /*multipart.addFilePart("fileUpload", uploadFile1);
            multipart.addFilePart("fileUpload", uploadFile2);*/

            List<String> response = multipart.finish();

            System.out.println("SERVER REPLIED:");

            for (String line : response) {
                System.out.println(line);
            }
        } catch (IOException ex) {
            System.err.println(ex);
        }
    }

上传文件的php脚本

foreach ($_FILES["uploaded_file"]["error"] as $key => $error) {
    if ($error == UPLOAD_ERR_OK) {
        $tmp_name = $_FILES["uploaded_file"]["tmp_name"][$key];
        $name = $_FILES["uploaded_file"]["name"][$key];
    $file_path = "../post_uploaded_images/";
        $file_path = $file_path . $name;
            if(@move_uploaded_file($tmp_name, $file_path)) 
            {
               echo "success";

            } else{

                echo "fail";
            }   
    }
}