[Java] Bild-Datei per POST an PHP-Script schicken

package com.android.nanobyte.postsender;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;



public class PostSender extends Activity {
 /** Called when the activity is first created. */
 
 
 
 protected void alertbox(String title, String mymessage)
 {
 new AlertDialog.Builder(this)
 .setMessage(mymessage)
 .setTitle(title)
 .setCancelable(true)
 .setNeutralButton(android.R.string.cancel,
 new DialogInterface.OnClickListener() {
 public void onClick(DialogInterface dialog, int whichButton){}
 })
 .show();
 }


 
 
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 
 DataOutputStream dos = null; 

 
 
 try {
 
 // Datei zum verschicken laden
 String fileName = "/sdcard/download/natur.jpg";
 File fl=new File(fileName);
 if(!fl.exists()) {
 alertbox("Fehler", "Datei wurde nicht gefunden!");
 }
 
 //String fileStream = readFileAsString(fileName);
 
 
 String agent = "Android 2.1 Uploader";
 
 String BONDARYSTRING = "----WebKitFormBoundarynx4g7AR1BWnBezIS";
 String lineEnd = "\r\n";
 String twoHyphens = "--";
 
 // Send data
 URL url = new URL("http://xXxXxXxXxXxXxXxXxXxXxX/versuchslabor/php/android/file-upload/index.php");
 HttpURLConnection conn = (HttpURLConnection) url.openConnection();
 conn.setRequestMethod("POST");
 conn.setDoOutput(true);
 conn.setDoInput(true);
 conn.setUseCaches(false);
 conn.setRequestProperty( "User-Agent", agent );
 conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BONDARYSTRING);
 
 dos = new DataOutputStream( conn.getOutputStream() );
 dos.writeBytes(twoHyphens+BONDARYSTRING+lineEnd); // Start Trenner
 dos.writeBytes("Content-Disposition: form-data; name=\"image\"; filename=\"dog.jpg\""+lineEnd);
 dos.writeBytes("Content-Type: image/jpeg"+lineEnd+lineEnd); // Datei-Type
 
 StringBuffer fileContent = ReadStringFromFile(fileName);
 
 dos.writeBytes(fileContent.toString());

 dos.writeBytes(lineEnd); // Neue Zeile
 dos.writeBytes(twoHyphens+BONDARYSTRING+lineEnd); // Zwischentrenner
 dos.writeBytes("Content-Disposition: form-data; name=\"title\""+lineEnd+lineEnd);
 dos.writeBytes("Sending from Android"); // Inhalt
 dos.writeBytes(lineEnd); // Neue Zeile
 dos.writeBytes(twoHyphens+BONDARYSTRING+twoHyphens+lineEnd); // Wichtig, letzter Trenner mit twoHyphens
 
 dos.flush(); // Abschicken
 
 
 // Get the response
 BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
 String line;
 while ((line = rd.readLine()) != null) {
 // Process line...
 }
 rd.close();
 
 dos.close();

 } catch (Exception e) {
 }
 }





 public StringBuffer ReadStringFromFile(String fileName) {
 //create file object
 File file = new File(fileName);
 
 int ch;
 StringBuffer strContent = new StringBuffer("");
 FileReader fin = null;
 
 try
 {
 /*
 * Create new FileInputStream object. Constructor of FileInputStream throws
 * FileNotFoundException if the agrument File does not exist.
 */
 
 fin = new FileReader(file);
 
 /*
 * To read bytes from stream use,
 * int read() method of FileInputStream class.
 *
 * This method reads a byte from stream. This method returns next byte of data
 * from file or -1 if the end of the file is reached.
 *
 * Read method throws IOException in case of any IO errors.
 */
 
 while( (ch = fin.read()) != -1)
 strContent.append((char)ch);
 
 /*
 * To close the FileInputStream, use
 * void close() method of FileInputStream class.
 *
 * close method also throws IOException.
 */
 fin.close(); 
 
 }
 catch(FileNotFoundException e)
 {
 System.out.println("File " + file.getAbsolutePath() + 
 " could not be found on filesystem");
 }
 catch(IOException ioe)
 {
 System.out.println("Exception while reading the file" + ioe);
 }
 
 //System.out.println("File contents :");
 // System.out.println(strContent);
 return strContent;
 }
}