Astuces et trucs informatique

[Android] uploader une fichier sur un serveur web

Un petit tuto pour apprendre à uploader une fichier depuis votre application android vers un serveur web.
Pour ce genre de tâche qui peut être longue, Android conseille d’implémenter un Service plutôt qu’une activité : un service tourne en tâche de fond et ne bloque pas l’application.
Pour ce tuto :

• créez une nouvelle application UploadFile et une classe UploadFile.
• ajouter la permission internet pour l’application
• créez le fichier main.xml pour la layout de la classe UploadFile
• créez  script PHP upload.php qui va traiter la réception du fichier.

Le code de la classe UploadFile :

  

package com.projet.UploadFile;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class UploadFile extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        HttpURLConnection connection = null;
        DataOutputStream outputStream = null;
        DataInputStream inputStream = null;
        String pathToOurFile = "/sdcard/nom_fichier";  
        String urlServer = "http://10.0.2.2:80/upload.php";
        String lineEnd = "\r\n";
        String twoHyphens = "--";
        String boundary =  "******";
        int bytesRead, bytesAvailable, bufferSize;
        byte[] buffer;
        int maxBufferSize = 1*1024*1024;
        try
        {
        FileInputStream fileInputStream = new FileInputStream(new       File(pathToOurFile) );
        URL url = new URL(urlServer);
        connection = (HttpURLConnection) url.openConnection();
        // Allow Inputs & Outputs
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        // Enable POST method
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Content-Type", "multipart/form-   data;boundary="+boundary);
        outputStream = new DataOutputStream( connection.getOutputStream() );
        outputStream.writeBytes(twoHyphens + boundary + lineEnd);
        outputStream.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + pathToOurFile +"\"" + lineEnd);
        outputStream.writeBytes(lineEnd);
        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        buffer = new byte[bufferSize];
        // Read file
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        while (bytesRead > 0)
        {
        outputStream.write(buffer, 0, bufferSize);
        bytesAvailable = fileInputStream.available();
        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        }
        outputStream.writeBytes(lineEnd);
        outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
        // Responses from the server (code and message)
        int serverResponseCode = connection.getResponseCode();
       String serverResponseMessage = connection.getResponseMessage();
        fileInputStream.close(); 
        outputStream.flush();
        outputStream.close();
        }
        catch (Exception ex)
        {   
        //Exception handling
         Log.d("MainActivity", "Print " + ex.toString());
        }
    }
}  

Le fichier de layout main.xml :

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

</LinearLayout>

Le fichier upload.php a été placé dans le Répertoires www de votre serveur web:

<?php
$target_path  = "./";
$target_path = $target_path . basename( $_FILES['uploadedfile']['name']);
if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
 echo "The file ".  basename( $_FILES['uploadedfile']['name']).
 " has been uploaded";
} else{
 echo "There was an error uploading the file, please try again!";
}
?>