Parsing JSON

Version imprimable

Parsing JSON

Bonjour,

J'ai un petit souci pour parser du JSON.

Pour m'aider, j'ai repris cet exemple qui marche très bien : http://www.androidhive.info/2012/01/...sing-tutorial/

Le fichier JSON est de type :

Code:

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{
****"contacts":*[
********{
****************"id":*"c200",
****************"name":*"Ravi*Tamada",
****************"email":*"ravi@gmail.com",
****************"address":*"xx-xx-xxxx,x*-*street,*x*-*country",
****************"gender"*:*"male",
****************"phone":*{
********************"mobile":*"*+91*0000000000",
********************"home":*"00*000000",
********************"office":*"00*000000"
****************}
********},
********{
****************"id":*"c201",
****************"name":*"Johnny*Depp",
****************"email":*"johnny_depp@gmail.com",
****************"address":*"xx-xx-xxxx,x*-*street,*x*-*country",
****************"gender"*:*"male",
****************"phone":*{
********************"mobile":*"*+91*0000000000",
********************"home":*"00*000000",
********************"office":*"00*000000"
****************}
********},
********.
********.
********.
********.
**]
}

Mais le problème et que je dois parser un fichier du type :

Code:

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{
"expirationDate":"2012-12-16*3:45",
"lines":
{
"line":[
{
**********"color"*********:*"(255,0,0)",
**********"id"************:*"11821949021891694",
**********"name"**********:*"Basso*Cambo*/*Balma-Gramont",
**********"shortName"*****:*"A",**********
**********"network"*******:*"Tisséo",
**********"transportMode"*:
*****************{*********
******************"id"*****:"13792273858822586",
******************"article":*"le",
******************"name"***:*"métro"
****************}*************************
********}
********,{
**********"color"*********:*"(255,94,22)",
**********"id"************:*"11821949021891902",
**********"name"**********:*"Navette*aéroport",
**********"shortName"*****:*"AERO",**********
**********"network"*******:*"Tisséo",
**********"transportMode"*:
*****************{*********
******************"id"*****:"13792273858822585",
******************"article":*"le",
******************"name"***:*"bus"
****************}*************************
********}
********,
.
.
.

J'ai donc essayé de modifier le code du tutoriel cité plus haut de cette manière(mais rien ne s'affiche, par contre l'application ne plante pas) :

Code:

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private static String url = "http://pt.data.tisseo.fr/linesList?format=json";
 
    // JSON Node names
    private static final String TAG_expirationDate = "expirationDate";
    private static final String TAG_line = "line";
    private static final String TAG_color = "color";
    private static final String TAG_id = "id";
    private static final String TAG_name = "name";
    private static final String TAG_shortName = "shortName";
    private static final String TAG_network = "network";
    private static final String TAG_transportMode = "transportMode";
    private static final String TAG_id_transportMode = "id_transportMode";
    private static final String TAG_article = "article";
    private static final String TAG_name_transportMode = "name_transportMode";
 
    // contacts JSONArray
    JSONArray line = null;
    String expirationDate = null;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        // Hashmap for ListView
        ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
 
        // Creating JSON Parser instance
        JSONParser jParser = new JSONParser();
 
        // getting JSON string from URL
        JSONObject json = jParser.getJSONFromUrl(url);
 
        try {
            expirationDate = json.getString(TAG_expirationDate);
            // Getting Array of Contacts
            line = json.getJSONArray(TAG_line);
 
            // looping through All Contacts
            for(int i = 0; i < line.length(); i++){
                JSONObject l = line.getJSONObject(i);
 
                // Storing each json item in variable
                String color = l.getString(TAG_color);
                String id = l.getString(TAG_id);
                String name = l.getString(TAG_name);
                String shortName = l.getString(TAG_shortName);
                String network = l.getString(TAG_network);
 
                // Phone number is agin JSON Object
                JSONObject transportMode = l.getJSONObject(TAG_transportMode);
                String id_transportMode = transportMode.getString(TAG_id_transportMode);
                String article = transportMode.getString(TAG_article);
                String name_transportMode = transportMode.getString(TAG_name_transportMode);
 
                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();
 
                // adding each child node to HashMap key => value
                map.put(TAG_name, name);
                map.put(TAG_shortName, shortName);
                map.put(TAG_network, network);
                map.put(TAG_name_transportMode, name_transportMode);
 
                // adding HashList to ArrayList
                contactList.add(map);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

Je pense que le probleme vient du début du fichier mais je ne trouve pas de solution...

Code:

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{
"expirationDate":"2012-12-16*3:45",
"lines":

Quelqu'un aurait une idée du problème ?

Merci d'avance pour votre aide.

18/12/2012, 18h35
sinok

C'est pas franchement très élégant comme solution.

Crée plutôt des beans correspondant à ton json (un attribut par tag de ton json) et utilise jackson qui fera le parsing et la population du bean pour toi: http://nbenbourahla.developpez.com/t...ckson-android/

C'est vrai que ça a l'air mieux, mais cette méthode ne marche pas :?, même si je ne modifie rien a l'exemple...

Code:

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12-18 18:52:20.194: E/dalvikvm(381): Could not find class 'org.codehaus.jackson.map.ObjectMapper', referenced from method com.example.jsonjacksontest.UsersController.<init>
12-18 18:52:20.204: W/dalvikvm(381): VFY: unable to resolve new-instance 563 (Lorg/codehaus/jackson/map/ObjectMapper;) in Lcom/example/jsonjacksontest/UsersController;
12-18 18:52:20.204: D/dalvikvm(381): VFY: replacing opcode 0x22 at 0x000e
12-18 18:52:20.204: D/dalvikvm(381): VFY: dead code 0x0010-001c in Lcom/example/jsonjacksontest/UsersController;.<init> ()V
12-18 18:52:20.214: I/dalvikvm(381): Could not find method org.codehaus.jackson.JsonFactory.createJsonParser, referenced from method com.example.jsonjacksontest.UsersController.init
12-18 18:52:20.214: W/dalvikvm(381): VFY: unable to resolve virtual method 3503: Lorg/codehaus/jackson/JsonFactory;.createJsonParser (Ljava/io/File;)Lorg/codehaus/jackson/JsonParser;
12-18 18:52:20.224: D/dalvikvm(381): VFY: replacing opcode 0x6e at 0x0007
12-18 18:52:20.224: W/dalvikvm(381): VFY: unable to resolve exception class 561 (Lorg/codehaus/jackson/JsonParseException;)
12-18 18:52:20.224: W/dalvikvm(381): VFY: unable to find exception handler at addr 0x28
12-18 18:52:20.224: W/dalvikvm(381): VFY:  rejected Lcom/example/jsonjacksontest/UsersController;.init ()V
12-18 18:52:20.224: W/dalvikvm(381): VFY:  rejecting opcode 0x0d at 0x0028
12-18 18:52:20.224: W/dalvikvm(381): VFY:  rejected Lcom/example/jsonjacksontest/UsersController;.init ()V
12-18 18:52:20.224: W/dalvikvm(381): Verifier rejected class Lcom/example/jsonjacksontest/UsersController;
12-18 18:52:20.234: D/AndroidRuntime(381): Shutting down VM
12-18 18:52:20.234: W/dalvikvm(381): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
12-18 18:52:20.254: E/AndroidRuntime(381): FATAL EXCEPTION: main
12-18 18:52:20.254: E/AndroidRuntime(381): java.lang.VerifyError: com.example.jsonjacksontest.UsersController
12-18 18:52:20.254: E/AndroidRuntime(381): 	at com.example.jsonjacksontest.MainActivity.onCreate(MainActivity.java:19)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.os.Looper.loop(Looper.java:123)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at android.app.ActivityThread.main(ActivityThread.java:4627)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at java.lang.reflect.Method.invokeNative(Native Method)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at java.lang.reflect.Method.invoke(Method.java:521)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-18 18:52:20.254: E/AndroidRuntime(381): 	at dalvik.system.NativeStart.main(Native Method)

19/12/2012, 00h52
nicroman

Attention aussi à la fonction getJSONFromUrl(String url) du premier tuto qui est complètement buguée (et doit être appelée dans un thread)..
(NullPointerException en cas de probleme, non gestion du code retour HTTP, non gestion des exceptions tout court d'ailleurs, non gestion de l'encodage et du charset,...)
19/12/2012, 10h50
sinok

Et accessoirement, l'erreur est due au fait que tu n'as pas intégré jackson dans les dépendances de ton projet.

A savoir jackson-core, jackson-databinding et éventuellement jackson-annotations

http://jackson.codehaus.org/
19/12/2012, 11h41
thomas3128
effectivement je les avais mis dans le dossier lib au lieu de libs et sa ne marchais pas :roll: par contre j'ai deux fichier jar "jackson-core-asl-1.8.5.jar" et "jackson-mapper-asl-1.8.5.jar"
C'est la même chose que le lien ?

Mais le projet d'exemple (http://nbenbourahla.developpez.com/t...ckson-android/) ne fonctionne toujours pas :/

Code:

usersController.findAll()

renvoie un nullPointerException.
cette fonction retourne userList donc je suppose donc que c'est les lignes
Code:

1 2 3 users = objectMapper.readValue(jp, Users.class); userList = users.get("Users");
userList reste null. Est-ce que cela vient d'un problème lors du téléchargement du fichier ?

Code complet : http://nbenbourahla.developpez.com/t...ckson-android/
19/12/2012, 14h03
sinok

a quelle ligne exactement as tu la NPE?
19/12/2012, 14h49
thomas3128

Code:

for(User u : usersController.findAll()) {

dans JsonParserMainActivity
20/12/2012, 12h34
nicroman

Parceque dans le tutorial toute les exceptions sont "catchées" et passées sous silence (aucune remontée à l'appelant), même pour les exceptions indiquant clairement que la fonction n'a pas pu effectué son boulot....

Commencez par virer tous les try/catch

J'ai toujours ce NPE :?

Il n'y a personne qui a réussi à faire fonctionner ce tuto et qui a trouver l'erreur ? :p

Le logcat :

Code:

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12-26 13:21:07.646: W/System.err(275): java.net.SocketException: Permission denied (maybe missing INTERNET permission)
12-26 13:21:07.656: W/System.err(275): 	at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocketImpl(Native Method)
12-26 13:21:07.666: W/System.err(275): 	at org.apache.harmony.luni.platform.OSNetworkSystem.createStreamSocket(OSNetworkSystem.java:187)
12-26 13:21:07.666: W/System.err(275): 	at org.apache.harmony.luni.net.PlainSocketImpl.create(PlainSocketImpl.java:266)
12-26 13:21:07.666: W/System.err(275): 	at java.net.Socket.checkClosedAndCreate(Socket.java:872)
12-26 13:21:07.666: W/System.err(275): 	at java.net.Socket.connect(Socket.java:1019)
12-26 13:21:07.666: W/System.err(275): 	at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:62)
12-26 13:21:07.666: W/System.err(275): 	at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionManager$ConnectionPool.getHttpConnection(HttpConnectionManager.java:145)
12-26 13:21:07.666: W/System.err(275): 	at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionManager.getConnection(HttpConnectionManager.java:67)
12-26 13:21:07.676: W/System.err(275): 	at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection.getHTTPConnection(HttpURLConnection.java:821)
12-26 13:21:07.676: W/System.err(275): 	at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:807)
12-26 13:21:07.676: W/System.err(275): 	at com.example.jsonjacksontest.UsersController.downloadJsonFile(UsersController.java:51)
12-26 13:21:07.676: W/System.err(275): 	at com.example.jsonjacksontest.UsersController.init(UsersController.java:37)
12-26 13:21:07.676: W/System.err(275): 	at com.example.jsonjacksontest.MainActivity$2.run(MainActivity.java:42)
12-26 13:21:07.676: W/dalvikvm(275): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
12-26 13:21:07.685: E/AndroidRuntime(275): Uncaught handler: thread Thread-8 exiting due to uncaught exception
12-26 13:21:07.685: E/AndroidRuntime(275): java.lang.NullPointerException
12-26 13:21:07.685: E/AndroidRuntime(275): 	at com.example.jsonjacksontest.MainActivity$2.run(MainActivity.java:51)
12-26 13:21:07.696: I/dalvikvm(275): threadid=7: reacting to signal 3
12-26 13:21:07.696: E/dalvikvm(275): Unable to open stack trace file '/data/anr/traces.txt': Permission denied

Et mon code complet :

MainActivity.java :

Code:

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package com.example.jsonjacksontest;
 
import java.io.IOException;
 
import org.codehaus.jackson.JsonParseException;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
	private UsersController usersController;
    private TextView displayJson;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
 
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		usersController = new UsersController();
 
		displayJson = (TextView) findViewById(R.id.jsonDisplay);
 
		Button startParsing = (Button) findViewById(R.id.startParsing);
		startParsing.setOnClickListener(new OnClickListener() {
		    @Override
		    public void onClick(View view) {
			gettingJson();
		    }
		});
    }
 
    final void gettingJson() {
 
		final Thread checkUpdate = new Thread() {
		    public void run() {
			try {
				usersController.init();
			} catch (JsonParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			final StringBuilder str = new StringBuilder("user : ");
			for (User u : usersController.findAll()) {
			    str.append("\n").append("first name : ").append(u.getFirstname());
			    str.append("\n").append("last name : ").append(u.getLastname());
			    str.append("\n").append("login : ").append(u.getLogin());
			    str.append("\n").append("twitter : ").append(u.getTwitter());
			    str.append("\n").append("Web : ").append(u.getWeb());
			}
			runOnUiThread(new Runnable() {
			        @Override
			        public void run() {
			            displayJson.setText(str.toString());
			        }
			    });
 
		    }
		};
		checkUpdate.start();
	    }
}

User.java :

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package com.example.jsonjacksontest;
 
public class User {
    private String firstname;
    private String lastname;
    private String login;
    private String twitter;
    private String web;
 
    public User() {
 
	    super();
	    this.firstname = "";
	    this.lastname = "";
	    this.login = "";
	    this.twitter = "";
	    this.web = "";
    }
 
    public User(String firstName, String lastName, String login,
                String twitter, String web) {
	    super();
	    this.firstname = firstName;
	    this.lastname = lastName;
	    this.login = login;
	    this.twitter = twitter;
	    this.web = web;
    }
 
    public String getFirstname() {
        return firstname;
    }
 
    public void setFirstname(String firstName) {
        this.firstname = firstName;
    }
 
    public String getLastname() {
        return lastname;
    }
 
    public void setLastname(String lastName) {
        this.lastname = lastName;
    }
 
    public String getLogin() {
        return login;
    }
 
    public void setLogin(String login) {
        this.login = login;
    }
 
    public String getTwitter() {
        return twitter;
    }
 
    public void setTwitter(String twitter) {
        this.twitter = twitter;
    }
 
    public String getWeb() {
        return web;
    }
 
    public void setWeb(String web) {
        this.web = web;
    }
 
}

Users.java :

Code:

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package com.example.jsonjacksontest;
 
import java.util.ArrayList;
import java.util.HashMap;
 
public class Users extends HashMap<String, ArrayList<User>> {
 
    private static final long serialVersionUID = 1L;
 
}

UsersController.java :

Code:

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package com.example.jsonjacksontest;
 
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
 
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.ObjectMapper;
 
import android.os.Environment;
 
public class UsersController {
 
    private static final String DL_URL = "";
 
    private ObjectMapper objectMapper = null;
    private JsonFactory jsonFactory = null;
    private JsonParser jp = null;
    private ArrayList<User> userList = null;
    private Users users = null;
    private File jsonOutputFile;
    private File jsonFile;
 
    public UsersController() {
	    objectMapper = new ObjectMapper();
	    jsonFactory = new JsonFactory();
    }
 
    public void init() throws JsonParseException, IOException {
	    downloadJsonFile();
	        jp = jsonFactory.createJsonParser(jsonFile);
	        users = objectMapper.readValue(jp, Users.class);
	        userList = users.get("Users");
    }
 
    private void downloadJsonFile() throws IOException {
 
		createFileAndDirectory();
		URL url = new URL(UsersController.DL_URL);
		HttpURLConnection urlConnection;
		urlConnection = (HttpURLConnection) url.openConnection();
		urlConnection.setRequestMethod("GET");
		urlConnection.setDoOutput(true);
		urlConnection.connect();
		FileOutputStream fileOutput = new FileOutputStream(jsonFile);
		InputStream inputStream = urlConnection.getInputStream();
		byte[] buffer = new byte[1024];
		int bufferLength = 0;
		while((bufferLength = inputStream.read(buffer)) > 0) {
			fileOutput.write(buffer, 0, bufferLength);
		}
		fileOutput.close();
    }
 
    private void createFileAndDirectory() throws FileNotFoundException {
 
	    final String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
	    final String meteoDirectory_path = extStorageDirectory + "/tutos-android";
	    jsonOutputFile = new File(meteoDirectory_path, "/");
	    if(jsonOutputFile.exists() == false)
	        jsonOutputFile.mkdirs();
	    jsonFile = new File(jsonOutputFile, "users.json");
    }
 
    public ArrayList<User> findAll() {
    	return userList;
    }
 
    public User findById(int id) {
    	return userList.get(id);
    }
 
}

26/12/2012, 15h09
sinok

La NPE n'est qu'une conséquence (à corriger également, tu dois tenter d'exécuter une méthode sur un objet qui est potentiellement null à la ligne 52 de ta classe MainActivity.

La source du problème est la suivante:

Code:

12-26 13:21:07.646: W/System.err(275): java.net.SocketException: Permission denied (maybe missing INTERNET permission)

Et, pour le coup, c'est relativement explicite, non?

En effet,
J'ai donc rajouter les lignes

Code:

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<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

dans le AndroidManifest.xml. Sa marche :) Merci.

Mais du coup j'en reviens à mon problème de base, j'ai du mal avec la structure de mon fichier Json...

Code:

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{
"expirationDate":"2012-12-30 3:45",
"lines":
{
"line":[
{
	  "color"         : "(255,0,0)",
	  "id"            : "11821949021891694",
	  "name"          : "Basso Cambo / Balma-Gramont",
	  "shortName"     : "A",	  
	  "network"       : "Tisséo",
	  "transportMode" :
	 	{	 
		  "id"     :"13792273858822586",
		  "article": "le",
		  "name"   : "métro"
		} 			
	}
        ,{
	  "color"         : "(255,94,22)",
	  "id"            : "11821949021891902",
	  "name"          : "Navette aéroport",
	  "shortName"     : "AERO",	  
	  "network"       : "Tisséo",
	  "transportMode" :
	 	{	 
		  "id"     :"13792273858822585",
		  "article": "le",
		  "name"   : "bus"
		} 			
	}
        ,{}
]
}
}

J'ai une classe line :

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package com.example.jsonjacksontest;
 
public class Line {
    private String color;
    private String name;
    private String shortName;
 
    public Line() {
	    super();
	    this.color = "";
	    this.name = "";
	    this.shortName = "";
    }
 
    public Line(String color, String name, String shortName) {
	    super();
	    this.color = color;
	    this.name = name;
	    this.shortName = shortName;
    }
 
	/**
         * @return the color
         */
	public String getColor() {
		return color;
	}
 
	/**
         * @param color the color to set
         */
	public void setColor(String color) {
		this.color = color;
	}
 
	/**
         * @return the name
         */
	public String getName() {
		return name;
	}
 
	/**
         * @param name the name to set
         */
	public void setName(String name) {
		this.name = name;
	}
 
	/**
         * @return the shortName
         */
	public String getShortName() {
		return shortName;
	}
 
	/**
         * @param shortName the shortName to set
         */
	public void setShortName(String shortName) {
		this.shortName = shortName;
	}
 
 
 
}

une classe Lines :

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package com.example.jsonjacksontest;
 
import java.util.ArrayList;
import java.util.HashMap;
 
public class Lines extends HashMap<String, ArrayList<Line>> {
 
    private static final long serialVersionUID = 1L;
 
}

et une classe LinesController :

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package com.example.jsonjacksontest;
 
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
 
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.ObjectMapper;
 
import android.os.Environment;
 
public class LinesController {
 
    private static final String DL_URL = "http://pt.data.tisseo.fr/linesList?format=json";
 
    private ObjectMapper objectMapper = null;
    private JsonFactory jsonFactory = null;
    private JsonParser jp = null;
    private ArrayList<Line> lineList = null;
    private Lines lines = null;
    private File jsonOutputFile;
    private File jsonFile;
 
    public LinesController() {
	    objectMapper = new ObjectMapper();
	    jsonFactory = new JsonFactory();
    }
 
    public void init() throws JsonParseException, IOException {
	    downloadJsonFile();
	        jp = jsonFactory.createJsonParser(jsonFile);
	        lines = objectMapper.readValue(jp, Lines.class);
	        lineList = lines.get("lines");
    }
 
    private void downloadJsonFile() throws IOException {
 
		createFileAndDirectory();
		URL url = new URL(LinesController.DL_URL);
		HttpURLConnection urlConnection;
		urlConnection = (HttpURLConnection) url.openConnection();
		urlConnection.setRequestMethod("GET");
		urlConnection.setDoOutput(true);
		urlConnection.connect();
		FileOutputStream fileOutput = new FileOutputStream(jsonFile);
		InputStream inputStream = urlConnection.getInputStream();
		byte[] buffer = new byte[1024];
		int bufferLength = 0;
		while((bufferLength = inputStream.read(buffer)) > 0) {
			fileOutput.write(buffer, 0, bufferLength);
		}
		fileOutput.close();
    }
 
    private void createFileAndDirectory() throws FileNotFoundException {
 
	    final String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
	    final String meteoDirectory_path = extStorageDirectory + "/Toulouse";
	    jsonOutputFile = new File(meteoDirectory_path, "/");
	    if(jsonOutputFile.exists() == false)
	        jsonOutputFile.mkdirs();
	    jsonFile = new File(jsonOutputFile, "lines.json");
    }
 
    public ArrayList<Line> findAll() {
    	return lineList;
    }
 
    public Line findById(int id) {
    	return lineList.get(id);
    }
 
}

mais le logcat m'affiche :

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12-29 17:41:07.307: D/dalvikvm(402): GC freed 6700 objects / 390024 bytes in 138ms
12-29 17:41:07.776: D/dalvikvm(402): GC freed 11955 objects / 524848 bytes in 122ms
12-29 17:41:08.016: W/System.err(402): org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token
12-29 17:41:08.016: W/System.err(402):  at [Source: /sdcard/Toulouse/lines.json; line: 2, column: 1]
12-29 17:41:08.028: W/System.err(402): 	at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:198)
12-29 17:41:08.028: W/System.err(402): 	at org.codehaus.jackson.map.deser.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:149)
12-29 17:41:08.028: W/System.err(402): 	at org.codehaus.jackson.map.deser.CollectionDeserializer.deserialize(CollectionDeserializer.java:107)
12-29 17:41:08.028: W/System.err(402): 	at org.codehaus.jackson.map.deser.CollectionDeserializer.deserialize(CollectionDeserializer.java:97)
12-29 17:41:08.028: W/System.err(402): 	at org.codehaus.jackson.map.deser.CollectionDeserializer.deserialize(CollectionDeserializer.java:26)
12-29 17:41:08.036: W/System.err(402): 	at org.codehaus.jackson.map.deser.MapDeserializer._readAndBind(MapDeserializer.java:235)
12-29 17:41:08.036: W/System.err(402): 	at org.codehaus.jackson.map.deser.MapDeserializer.deserialize(MapDeserializer.java:165)
12-29 17:41:08.036: W/System.err(402): 	at org.codehaus.jackson.map.deser.MapDeserializer.deserialize(MapDeserializer.java:25)
12-29 17:41:08.036: W/System.err(402): 	at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2376)
12-29 17:41:08.036: W/System.err(402): 	at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1087)
12-29 17:41:08.046: W/System.err(402): 	at com.example.jsonjacksontest.LinesController.init(LinesController.java:39)
12-29 17:41:08.056: W/System.err(402): 	at com.example.jsonjacksontest.MainActivity$2.run(MainActivity.java:42)
12-29 17:41:08.056: W/dalvikvm(402): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
12-29 17:41:08.066: E/AndroidRuntime(402): Uncaught handler: thread Thread-8 exiting due to uncaught exception
12-29 17:41:08.066: E/AndroidRuntime(402): java.lang.NullPointerException
12-29 17:41:08.066: E/AndroidRuntime(402): 	at com.example.jsonjacksontest.MainActivity$2.run(MainActivity.java:51)
12-29 17:41:08.086: I/dalvikvm(402): threadid=7: reacting to signal 3
12-29 17:41:08.086: E/dalvikvm(402): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
12-29 17:41:09.567: I/Process(402): Sending signal. PID: 402 SIG: 9

Que doit-on faire pour le transportMode ? J'ai créer dans la classe line, un attribut de type TransportMode. TransportMode étant une classe possédant les attributs "id", "article" et "name". C'est bien cela qu'il faut faire ?
Suis-je obligé de récupéré toutes les valeurs du fichier ? je me fiche de "expirationDate"

Code:

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{
"expirationDate":"2012-12-30 3:45",
"lines":
{
"line":[
{
	  "color"         : "(255,0,0)",
	  "id"            : "11821949021891694",
	  "name"          : "Basso Cambo / Balma-Gramont",
	  "shortName"     : "A",	  
	  "network"       : "Tisséo",
	  "transportMode" :
	 	{	 
		  "id"     :"13792273858822586",
		  "article": "le",
		  "name"   : "métro"
		} 			
	}
        ,{
	  "color"         : "(255,94,22)",
	  "id"            : "11821949021891902",
	  "name"          : "Navette aéroport",
	  "shortName"     : "AERO",	  
	  "network"       : "Tisséo",
	  "transportMode" :
	 	{	 
		  "id"     :"13792273858822585",
		  "article": "le",
		  "name"   : "bus"
		} 			
	}
        ,{}
]
}
}