[Android] Parser un fichier JSON

Parser un fichier JSON [Android] - Java - Programmation

Marsh Posté le 06-01-2013 à 17:45:36    

Bonjour,
 
Je doit parser un fichier JSON, je n'ai pas de soucis avec un fichier de type :
 

Code :
  1. {
  2.     "Users": [
  3.         {
  4.             "firstname": "",
  5.             "lastname": "",
  6.             "login": "",
  7.             "twitter": "",
  8.             "mail": "",
  9.     "telephone" :
  10.  {
  11.   "fixe": "",
  12.   "mobile": ""
  13.  }
  14.         },
  15.         {
  16.             "firstname": "",
  17.             "lastname": "",
  18.             "login": "",
  19.             "twitter": "",
  20.             "mail": "",
  21.             "telephone" :
  22.  {
  23.   "fixe": "",
  24.   "mobile": ""
  25.  }
  26.         }
  27.     ]
  28. }


 
J'utilise le code suivant :
 
UsersController

Code :
  1. package com.example.parsingtest;
  3. import java.io.File;
  4. import java.io.FileNotFoundException;
  5. import java.io.FileOutputStream;
  6. import java.io.IOException;
  7. import java.io.InputStream;
  8. import java.net.HttpURLConnection;
  9. import java.net.MalformedURLException;
  10. import java.net.URL;
  11. import java.util.ArrayList;
  13. import org.codehaus.jackson.JsonFactory;
  14. import org.codehaus.jackson.JsonParseException;
  15. import org.codehaus.jackson.JsonParser;
  16. import org.codehaus.jackson.map.ObjectMapper;
  18. import android.os.Environment;
  20. public class UsersController {
  22.     private static final String DL_URL = "http://XXX/users.json";
  24.     private ObjectMapper objectMapper = null;
  25.     private JsonFactory jsonFactory = null;
  26.     private JsonParser jp = null;
  27.     private ArrayList<User> userList = null;
  28.     private Users users = null;
  29.     private File jsonOutputFile;
  30.     private File jsonFile;
  32.     public UsersController() {
  33.     objectMapper = new ObjectMapper();
  34.     jsonFactory = new JsonFactory();
  35.     }
  37.     public void init() {
  38.     downloadJsonFile();
  39.     try{
  40.         jp = jsonFactory.createJsonParser(jsonFile);
  41.         users = objectMapper.readValue(jp, Users.class);
  42.         userList = users.get("users" );
  43.     } catch(JsonParseException e) {
  44.         e.printStackTrace();
  45.     } catch(IOException e) {
  46.         e.printStackTrace();
  47.     }
  48.     }
  50.     private void downloadJsonFile() {
  51.     try{
  52.         createFileAndDirectory();
  53.         URL url = new URL(UsersController.DL_URL);
  54.         HttpURLConnection urlConnection;
  55.         urlConnection = (HttpURLConnection) url.openConnection();
  56.         urlConnection.setRequestMethod("GET" );
  57.         urlConnection.setDoOutput(true);
  58.         urlConnection.connect();
  59.         FileOutputStream fileOutput = new FileOutputStream(jsonFile);
  60.         InputStream inputStream = urlConnection.getInputStream();
  61.         byte[] buffer = new byte[1024];
  62.         int bufferLength = 0;
  63.         while((bufferLength = inputStream.read(buffer)) > 0) {
  64.         fileOutput.write(buffer, 0, bufferLength);
  65.         }
  66.         fileOutput.close();
  67.     } catch(MalformedURLException e) {
  68.         e.printStackTrace();
  69.     } catch(IOException e) {
  70.         e.printStackTrace();
  71.     }
  72.     }
  74.     private void createFileAndDirectory() throws FileNotFoundException {
  75.     final String extStorageDirectory = Environment
  76.         .getExternalStorageDirectory().toString();
  77.     final String meteoDirectory_path = extStorageDirectory + "/tutos-android";
  78.     jsonOutputFile = new File(meteoDirectory_path, "/" );
  79.     if(jsonOutputFile.exists() == false)
  80.         jsonOutputFile.mkdirs();
  81.     jsonFile = new File(jsonOutputFile, "users.json" );
  82.     }
  84.     public ArrayList<User> findAll() {
  85.      return userList;
  86.     }
  88.     public User findById(int id) {
  89.      return userList.get(id);
  90.     }
  92. }


 
User

Code :
  1. package com.example.parsingtest;
  3. public class User {
  4.     private String firstname;
  5.     private String lastname;
  6.     private String login;
  7.     private String twitter;
  8.     private String mail;
  9.     private Telephone telephone;
  11.     public User() {
  12.     super();
  13.     this.firstname = "";
  14.     this.lastname = "";
  15.     this.login = "";
  16.     this.twitter = "";
  17.     this.mail = "";
  18.     this.telephone = null;
  19.     }
  21.     public User(String firstName, String lastName, String login,
  22.                 String twitter, String web) {
  23.     super();
  24.     this.firstname = firstName;
  25.     this.lastname = lastName;
  26.     this.login = login;
  27.     this.twitter = twitter;
  28.     this.mail = web;
  29.     }
  31.     public String getFirstname() {
  32.         return firstname;
  33.     }
  35.     public void setFirstname(String firstName) {
  36.         this.firstname = firstName;
  37.     }
  39.     public String getLastname() {
  40.         return lastname;
  41.     }
  43.     public void setLastname(String lastName) {
  44.         this.lastname = lastName;
  45.     }
  47.     public String getLogin() {
  48.         return login;
  49.     }
  51.     public void setLogin(String login) {
  52.         this.login = login;
  53.     }
  55.     public String getTwitter() {
  56.         return twitter;
  57.     }
  59.     public void setTwitter(String twitter) {
  60.         this.twitter = twitter;
  61.     }
  63.     public String getMail() {
  64.         return mail;
  65.     }
  67.     public void setMail(String mail) {
  68.         this.mail = mail;
  69.     }
  71. public Telephone getTelephone() {
  72.  return telephone;
  73. }
  75. public void setTelephone(Telephone telephone) {
  76.  this.telephone = telephone;
  77. }
  79. }


 
Users

Code :
  1. package com.example.parsingtest;
  3. import java.util.ArrayList;
  4. import java.util.HashMap;
  6. public class Users extends HashMap<String, ArrayList<User>> {
  8.     private static final long serialVersionUID = 1L;
  10. }


 
Telephone

Code :
  1. package com.example.parsingtest;
  3. import org.json.JSONObject;
  5. public class Telephone extends JSONObject {
  7. private String fixe;
  8. private String mobile;
  10. public String getFixe() {
  11.  return fixe;
  12. }
  13. public void setFixe(String fixe) {
  14.  this.fixe = fixe;
  15. }
  16. public String getMobile() {
  17.  return mobile;
  18. }
  19. public void setMobile(String mobile) {
  20.  this.mobile = mobile;
  21. }
  28. }


 
MainActivity

Code :
  1. package com.example.parsingtest;
  3. import android.os.Bundle;
  4. import android.app.Activity;
  5. import android.view.View;
  6. import android.view.View.OnClickListener;
  7. import android.widget.Button;
  8. import android.widget.TextView;
  10. public class MainActivity extends Activity {
  12. private UsersController usersController;
  13.     private TextView displayJson;
  15.     @Override
  16.     public void onCreate(Bundle savedInstanceState) {
  17.    
  18.  super.onCreate(savedInstanceState);
  19.  setContentView(R.layout.activity_main);
  20.  usersController = new UsersController();
  22.  displayJson = (TextView) findViewById(R.id.jsonDisplay);
  24.  Button startParsing = (Button) findViewById(R.id.startParsing);
  25.  startParsing.setOnClickListener(new OnClickListener() {
  26.      @Override
  27.      public void onClick(View view) {
  28.   gettingJson();
  29.      }
  30.  });
  31.     }
  33.     final void gettingJson() {
  34.    
  35.  final Thread checkUpdate = new Thread() {
  36.      public void run() {
  37.   usersController.init();
  38.   final StringBuilder str = new StringBuilder("user :\n " );
  39.   for (User u : usersController.findAll()) {
  40.       str.append("\n" ).append("first name : " ).append(u.getFirstname());
  41.       str.append("\n" ).append("last name : " ).append(u.getLastname());
  42.       str.append("\n" ).append("login : " ).append(u.getLogin());
  43.       str.append("\n" ).append("twitter : " ).append(u.getTwitter());
  44.       str.append("\n" ).append("Mail : " ).append(u.getMail());
  45.       str.append("\n" ).append("Mobile : " ).append(u.getTelephone().getMobile());
  46.       str.append("\n" ).append("Fixe : " ).append(u.getTelephone().getFixe());
  47.       str.append("\n" );
  48.   }
  49.   runOnUiThread(new Runnable() {
  50.           @Override
  51.           public void run() {
  52.               displayJson.setText(str.toString());
  53.           }
  54.       });
  56.      }
  57.  };
  58.  checkUpdate.start();
  59.     }
  60. }


 
Mais j'ai un gros problème avec un fichier de type :
 

Code :
  1. {
  2. "attribut": "",
  3. "objetUsers" :
  4. {
  5.     "Users": [
  6.         {
  7.             "firstname": "",
  8.             "lastname": "",
  9.             "login": "",
  10.             "twitter": "",
  11.             "mail": "",
  12.     "telephone" :
  13.  {
  14.   "fixe": "",
  15.   "mobile": ""
  16.  }
  17.         },
  18.         {
  19.             "firstname": "",
  20.             "lastname": "",
  21.             "login": "",
  22.             "twitter": "",
  23.             "mail": "",
  24.             "telephone" :
  25.  {
  26.   "fixe": "",
  27.   "mobile": ""
  28.  }
  29.         }
  30.     ]
  31. }
  32. }


 
Ces lignes en plus...

Code :
  1. {
  2. "attribut": "",
  3. "objetUsers" :
  4. {


 
J'ai tenter de modifier avec le code suivant...
 
ObjetUsers

Code :
  1. package com.example.parsingtest;
  3. import org.json.JSONObject;
  5. public class ObjetUsers extends JSONObject  {
  7. private Users users;
  9. public Users getUsers() {
  10.  return users;
  11. }
  13. public void setUsers(Users objetUsers) {
  14.  this.users = objetUsers;
  15. }
  16. }


 
Users

Code :
  1. package com.example.parsingtest;
  3. import java.util.ArrayList;
  5. public class Users {
  7. private ArrayList<User> listUser;
  9. public ArrayList<User> getListUser() {
  10.  return listUser;
  11. }
  13. public void setListUser(ArrayList<User> listUser) {
  14.  this.listUser = listUser;
  15. }
  16. }


 
User

Code :
  1. package com.example.parsingtest;
  3. public class User {
  4.     private String firstname;
  5.     private String lastname;
  6.     private String login;
  7.     private String twitter;
  8.     private String mail;
  9.     private Telephone telephone;
  11.     public User() {
  12.     super();
  13.     this.firstname = "";
  14.     this.lastname = "";
  15.     this.login = "";
  16.     this.twitter = "";
  17.     this.mail = "";
  18.     this.telephone = null;
  19.     }
  21.     public User(String firstName, String lastName, String login,
  22.                 String twitter, String web) {
  23.     super();
  24.     this.firstname = firstName;
  25.     this.lastname = lastName;
  26.     this.login = login;
  27.     this.twitter = twitter;
  28.     this.mail = web;
  29.     }
  31.     public String getFirstname() {
  32.         return firstname;
  33.     }
  35.     public void setFirstname(String firstName) {
  36.         this.firstname = firstName;
  37.     }
  39.     public String getLastname() {
  40.         return lastname;
  41.     }
  43.     public void setLastname(String lastName) {
  44.         this.lastname = lastName;
  45.     }
  47.     public String getLogin() {
  48.         return login;
  49.     }
  51.     public void setLogin(String login) {
  52.         this.login = login;
  53.     }
  55.     public String getTwitter() {
  56.         return twitter;
  57.     }
  59.     public void setTwitter(String twitter) {
  60.         this.twitter = twitter;
  61.     }
  63.     public String getMail() {
  64.         return mail;
  65.     }
  67.     public void setMail(String mail) {
  68.         this.mail = mail;
  69.     }
  71. public Telephone getTelephone() {
  72.  return telephone;
  73. }
  75. public void setTelephone(Telephone telephone) {
  76.  this.telephone = telephone;
  77. }
  78. }


 
Telephone

Code :
  1. package com.example.parsingtest;
  3. import org.json.JSONObject;
  5. public class Telephone extends JSONObject {
  7. private String fixe;
  8. private String mobile;
  10. public String getFixe() {
  11.  return fixe;
  12. }
  13. public void setFixe(String fixe) {
  14.  this.fixe = fixe;
  15. }
  16. public String getMobile() {
  17.  return mobile;
  18. }
  19. public void setMobile(String mobile) {
  20.  this.mobile = mobile;
  21. }
  22. }


 
UsersController

Code :
  1. package com.example.parsingtest;
  3. import java.io.File;
  4. import java.io.FileNotFoundException;
  5. import java.io.FileOutputStream;
  6. import java.io.IOException;
  7. import java.io.InputStream;
  8. import java.net.HttpURLConnection;
  9. import java.net.MalformedURLException;
  10. import java.net.URL;
  11. import java.util.ArrayList;
  13. import org.codehaus.jackson.JsonFactory;
  14. import org.codehaus.jackson.JsonParseException;
  15. import org.codehaus.jackson.JsonParser;
  16. import org.codehaus.jackson.map.ObjectMapper;
  18. import android.os.Environment;
  20. public class UsersController {
  22.     private static final String DL_URL = "http://s414547850.onlinehome.fr/users.json";
  24.     private ObjectMapper objectMapper = null;
  25.     private JsonFactory jsonFactory = null;
  26.     private JsonParser jp = null;
  27.     private ArrayList<User> userList = null;
  28.     private Parse parse = null;
  29.     private File jsonOutputFile;
  30.     private File jsonFile;
  32.     public UsersController() {
  33.     objectMapper = new ObjectMapper();
  34.     jsonFactory = new JsonFactory();
  35.     }
  37.     public void init() {
  38.     downloadJsonFile();
  39.     try{
  40.         jp = jsonFactory.createJsonParser(jsonFile);
  41.         parse = objectMapper.readValue(jp, Parse.class);
  42.         userList = parse.getObjetUsers().getUsers().getListUser();
  43.     } catch(JsonParseException e) {
  44.         e.printStackTrace();
  45.     } catch(IOException e) {
  46.         e.printStackTrace();
  47.     }
  48.     }
  50.     private void downloadJsonFile() {
  51.     try{
  52.         createFileAndDirectory();
  53.         URL url = new URL(UsersController.DL_URL);
  54.         HttpURLConnection urlConnection;
  55.         urlConnection = (HttpURLConnection) url.openConnection();
  56.         urlConnection.setRequestMethod("GET" );
  57.         urlConnection.setDoOutput(true);
  58.         urlConnection.connect();
  59.         FileOutputStream fileOutput = new FileOutputStream(jsonFile);
  60.         InputStream inputStream = urlConnection.getInputStream();
  61.         byte[] buffer = new byte[1024];
  62.         int bufferLength = 0;
  63.         while((bufferLength = inputStream.read(buffer)) > 0) {
  64.         fileOutput.write(buffer, 0, bufferLength);
  65.         }
  66.         fileOutput.close();
  67.     } catch(MalformedURLException e) {
  68.         e.printStackTrace();
  69.     } catch(IOException e) {
  70.         e.printStackTrace();
  71.     }
  72.     }
  74.     private void createFileAndDirectory() throws FileNotFoundException {
  75.     final String extStorageDirectory = Environment
  76.         .getExternalStorageDirectory().toString();
  77.     final String meteoDirectory_path = extStorageDirectory + "/tutos-android";
  78.     jsonOutputFile = new File(meteoDirectory_path, "/" );
  79.     if(jsonOutputFile.exists() == false)
  80.         jsonOutputFile.mkdirs();
  81.     jsonFile = new File(jsonOutputFile, "users.json" );
  82.     }
  84.     public ArrayList<User> findAll() {
  85.      return userList;
  86.     }
  88.     public User findById(int id) {
  89.      return userList.get(id);
  90.     }
  91. }


 
Parse

Code :
  1. package com.example.parsingtest;
  3. public class Parse {
  5. private String attribut;
  6. private ObjetUsers objetUsers;
  8. public String getAttribut() {
  9.  return attribut;
  10. }
  11. public void setAttribut(String attribut) {
  12.  this.attribut = attribut;
  13. }
  14. public ObjetUsers getObjetUsers() {
  15.  return objetUsers;
  16. }
  17. public void setObjetUsers(ObjetUsers objetUsers) {
  18.  this.objetUsers = objetUsers;
  19. }
  20. }


 
... Mais cela ne fonctionne pas. Voici le logcat :
 

Code :
  1. 01-05 21:51:51.649: D/dalvikvm(327): GC freed 5586 objects / 356272 bytes in 59ms
  2. 01-05 21:51:51.829: D/dalvikvm(327): GC freed 13527 objects / 590536 bytes in 54ms
  3. 01-05 21:51:52.049: D/dalvikvm(327): GC freed 12646 objects / 504056 bytes in 55ms
  4. 01-05 21:51:52.079: W/System.err(327): org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "Users" (Class com.example.parsingtest.ObjetUsers), not marked as ignorable
  5. 01-05 21:51:52.079: W/System.err(327):  at [Source: /sdcard/tutos-android/users.json; line: 5, column: 15] (through reference chain: com.example.parsingtest.Parse["objetUsers"]->com.example.parsingtest.ObjetUsers["Users"])
  6. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.StdDeserializationContext.unknownFieldException(StdDeserializationContext.java:246)
  7. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.StdDeserializer.reportUnknownProperty(StdDeserializer.java:604)
  8. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.StdDeserializer.handleUnknownProperty(StdDeserializer.java:590)
  9. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.BeanDeserializer.handleUnknownProperty(BeanDeserializer.java:689)
  10. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:514)
  11. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:350)
  12. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:252)
  13. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.SettableBeanProperty$MethodProperty.deserializeAndSet(SettableBeanProperty.java:356)
  14. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:494)
  15. 01-05 21:51:52.079: W/System.err(327):  at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:350)
  16. 01-05 21:51:52.090: W/System.err(327):  at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2376)
  17. 01-05 21:51:52.090: W/System.err(327):  at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1087)
  18. 01-05 21:51:52.090: W/System.err(327):  at com.example.parsingtest.UsersController.init(UsersController.java:41)
  19. 01-05 21:51:52.090: W/System.err(327):  at com.example.parsingtest.MainActivity$2.run(MainActivity.java:37)
  20. 01-05 21:51:52.090: W/dalvikvm(327): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
  21. 01-05 21:51:52.090: E/AndroidRuntime(327): Uncaught handler: thread Thread-8 exiting due to uncaught exception
  22. 01-05 21:51:52.090: E/AndroidRuntime(327): java.lang.NullPointerException
  23. 01-05 21:51:52.090: E/AndroidRuntime(327):  at com.example.parsingtest.MainActivity$2.run(MainActivity.java:39)
  24. 01-05 21:51:52.109: I/dalvikvm(327): threadid=7: reacting to signal 3
  25. 01-05 21:51:52.109: E/dalvikvm(327): Unable to open stack trace file '/data/anr/traces.txt': Permission denied


 
Le problème et que je sais même pas si je m'y prend bien au niveau de la structure du fichier Json, et du coup de mes classes. Est-ce que le problème viens de la structure de mes classes ou des quelques lignes suivantes ?
 

Code :
  1. public void init() {
  2.     downloadJsonFile();
  3.     try{
  4.         jp = jsonFactory.createJsonParser(jsonFile);
  5.         parse = objectMapper.readValue(jp, Parse.class);
  6.         userList = parse.getObjetUsers().getUsers().getListUser();
  7.     } catch(JsonParseException e) {
  8.         e.printStackTrace();
  9.     } catch(IOException e) {
  10.         e.printStackTrace();
  11.     }
  12.     }


 
Merci d'avance...

Message cité 1 fois
Reply

Marsh Posté le 06-01-2013 à 17:45:36   

Reply

Marsh Posté le 09-01-2013 à 00:07:21    

Thomas3128 a écrit :


Mais j'ai un gros problème avec un fichier de type :
 

Code :
  1. {
  2. "attribut": "",
  3. "objetUsers" :
  4. {
  5.     "Users": [
  6.         {
  7.             "firstname": "",
  8.             "lastname": "",
  9.             "login": "",
  10.             "twitter": "",
  11.             "mail": "",
  12.     "telephone" :
  13.  {
  14.   "fixe": "",
  15.   "mobile": ""
  16.  }
  17.         },
  18.         {
  19.             "firstname": "",
  20.             "lastname": "",
  21.             "login": "",
  22.             "twitter": "",
  23.             "mail": "",
  24.             "telephone" :
  25.  {
  26.   "fixe": "",
  27.   "mobile": ""
  28.  }
  29.         }
  30.     ]
  31. }
  32. }




 
En mettant "Users" en minuscule, ça donne quoi ?

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