Android - MVC: как загрузить файлы с Android в метод контроллера MVC - PullRequest
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Android - MVC: как загрузить файлы с Android в метод контроллера MVC

0 голосов
/ 16 июня 2019

Мне удалось загрузить файл из Android в MVC, но в этот раз я пытаюсь загрузить несколько файлов. У меня есть этот код, который получает файл с Android

Когда код получит ответ, он получит ответ не OK 500, может кто-нибудь определить, где я ошибаюсь.

У меня есть код, который работает для одного файла, но код отличается от загрузки нескольких файлов, и он прекрасно работает, просто когда я загружаю несколько файлов с этим кодом, я получаю ошибку 500 ответа

MVC 

    public string UploadSellImage(HttpPostedFileBase[] file)
    {

        return file[0].FileName;

    }

Клиент Android

Multipart.java 

package com.asianretail.trikam.asianretail;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

/**
 * This utility class provides an abstraction layer for sending multipart HTTP
 * POST requests to a web server.
 * @author www.codejava.net
 *
 */

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);
    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, byte[] uploadFile)
        throws IOException {
    String fileName = fieldName;
    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();

    InputStream inputStream = new ByteArrayInputStream(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;
}
*/




/**
 * 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 = "";

    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) {

        BufferedInputStream in = new BufferedInputStream(httpConn.getInputStream());
        response = inputStreamToString(in);

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

    return response;
}


private static String inputStreamToString(InputStream in) {
    String result = "";
    if (in == null) {
        return result;
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in,"UTF-8"));
        StringBuilder out = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            out.append(line);
        }
        result = out.toString();
        reader.close();

        return result;
    } catch (Exception e) {
        // TODO: handle exception
        //Logcat.e("InputStream", "Error : " + e.toString());
        return result;
    }

}
}

Часть, которая отправляет файлы: 

    SharedPreferences preferences = getActivity().getSharedPreferences(PREFERENCE, Context.MODE_PRIVATE);
            String userId = preferences.getString("id","0");

            MultipartUtility multipart = new 
 MultipartUtility("http://xx.xx.xx.xxx/Home/UploadSellImage", charset);

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

            multipart.addFormField("Username", "TestUser");

            multipart.addFilePart("uploaded_file[]", imgS.get(0).bytes);

            String response = multipart.finish();
...