Отправить файл изображения с помощью HTTP-соединений java HTTP

Ответ 1

import java.io.File;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.util.EntityUtils;


public class PostFile {
  public static void main(String[] args) throws Exception {
    HttpClient httpclient = new DefaultHttpClient();
    httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

    HttpPost httppost = new HttpPost("http://localhost:9000/upload");
    File file = new File("C:\\Users\\joao\\Pictures\\bla.jpg"");

    MultipartEntity mpEntity = new MultipartEntity();
    ContentBody cbFile = new FileBody(file, "image/jpeg");
    mpEntity.addPart("userfile", cbFile);


    httppost.setEntity(mpEntity);
    System.out.println("executing request " + httppost.getRequestLine());
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity resEntity = response.getEntity();

    System.out.println(response.getStatusLine());
    if (resEntity != null) {
      System.out.println(EntityUtils.toString(resEntity));
    }
    if (resEntity != null) {
      resEntity.consumeContent();
    }

    httpclient.getConnectionManager().shutdown();
  }
}

Используйте HttpClient для разработки этого кода. Всегда лучше использовать стабильные библиотеки, кроме обработки с нуля, если только что-то не обрабатывается обычным способом.

Ответ 2

Классы Reader/Writer предназначены для обработки текстовых данных, а изображения - двоичные. Вам нужно интерпретировать ваши файлы как двоичные:

FileChannel         in  = new FileInputStream(fileToUpload).getChannel();
WritableByteChannel out = Channels.newChannel(connection.getOutputStream());

in.transferTo(0, fileToUpload.size(), out)

Конечно, вам все равно нужно закрыть все открытые ресурсы.

Ответ 3

Попробуйте следующее:

private DefaultHttpClient mHttpClient;
Context context;
public String error = "";

//Contrutor para que metodos possam ser usados fora de uma activity
public HTTPconector(Context context) {
    this.context = context;
}


public HTTPconector() {
    HttpParams params = new BasicHttpParams();
    params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
    mHttpClient = new DefaultHttpClient(params);
}


public void FileClientPost(String txtUrl, File file){
    try
    {
        error = "";
        HttpPost httppost = new HttpPost(txtUrl);
        MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
        multipartEntity.addPart("Image", new FileBody(file));
        httppost.setEntity(multipartEntity);
        mHttpClient.execute(httppost, new PhotoUploadResponseHandler());
    }
    catch (Exception e)
    {
        Log.e(HTTPconector.class.getName(), e.getLocalizedMessage(), e);
        e.getStackTrace();
        error = e.getMessage();
    }
}

//Verifica se a rede esta disponível
public boolean isNetworkAvailable() {
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    // if no network is available networkInfo will be null
    // otherwise check if we are connected
    if (networkInfo != null && networkInfo.isConnected()) {
        return true;
    }
    return false;
}

public String Get(String txtUrl){
    try {
        URL url = new URL(txtUrl);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setReadTimeout(10000);
        con.setConnectTimeout(15000);
        con.setRequestMethod("GET");
        con.setDoInput(true);
        con.connect();

        return readStream(con.getInputStream());

    }  catch (ProtocolException e) {
        e.printStackTrace();
        return "ERRO: "+e.getMessage();
    } catch (IOException e) {
        e.printStackTrace();
        return "ERRO: "+e.getMessage();
    }
}


public String Post(String txtUrl){
    File image;

    try {
        URL url = new URL(txtUrl);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("POST");
        con.setDoInput(true);
        con.setDoOutput(true);
        con.connect();

        //con.getOutputStream().write( ("name=" + "aa").getBytes());

        return readStream(con.getInputStream());
    } catch (ProtocolException e) {
        e.printStackTrace();
        return "ERRO: "+e.getMessage();
    } catch (IOException e) {
        e.printStackTrace();
        return "ERRO: "+e.getMessage();
    }
}


//Usado para fazer conexão com a internet
public String conectar(String u){
    String resultServer = "";
    try {
        URL url = new URL(u);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        resultServer = readStream(con.getInputStream());
    } catch (Exception e) {
        e.printStackTrace();
        resultServer = "ERRO: "+ e.getMessage();
    }

    Log.i("HTTPMANAGER: ", resultServer);
    return resultServer;
}

//Lê o resultado da conexão
private String readStream(InputStream in) {
    String serverResult = "";
    BufferedReader reader = null;
    try {
        reader = new BufferedReader(new InputStreamReader(in));
        String line = "";
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }

        serverResult = reader.toString();
    }   catch (IOException e) {
        e.printStackTrace();
        serverResult = "ERRO: "+ e.getMessage();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
                serverResult = "ERRO: "+ e.getMessage();
            }
        }
    }
    return  serverResult;
}

private class PhotoUploadResponseHandler implements ResponseHandler<Object>
{
    @Override
    public Object handleResponse(HttpResponse response)throws ClientProtocolException, IOException {

        HttpEntity r_entity = response.getEntity();
        String responseString = EntityUtils.toString(r_entity);
        Log.d("UPLOAD", responseString);
        return null;
    }
}