Java-Gson konvertieren Fehler

Question

Ich versuche, Swing-App auf Netbeans zu entwickeln. Ich benutze Gson zu decode json.İ erhalten Json Daten von PHP-Website. Ich konnte json-Daten nicht in Java-Array konvertieren.

Wie könnte ich bekommen JSON-Datei in Java-Array konvertieren. Und dann muss ich jcombobox datasource dieses Array setzen.

Meine JSON-Datei wie diese auf url

[{"id":"1", 
"ad":"jack", 
"latitude":"41.0000", 
"longitude":"32.000", 
"speed":"", 
"hour":"01:28:56", 
"day":"18.04.2016", 
"adres":"adres", 
"resimyol":"http:\/\/maps.google.com\/maps\/api\/staticmap?.jpg"}, 
{"id":"2", 
"ad":"Abraham", 
"latitude":"41.0000", 
"longitude":"41.0000", 
"speed":"", 
"hour":"01:28:56", 
"day":"18.04.2016", 
"adres":"adres", 
"resimyol":"http:\/\/maps.google.com\/maps\/api\/staticmap?.jpg"}] 

Und hier meine Java-Datei

public class JsonPojo { 
public String id; 
public String ad; 
public String latitude; 
public String longitude; 
public String speed; 
public String hour; 
public String day; 
public String adres; 
public String resimyol; 
public String getId() { return id; } 
public String getName() { return ad; } 
public String getlat() { return latitude; } 
public String getlon() { return longitude; } 
public String getspeed() { return speed; } 
public String gethour() { return hour; } 
public String getday() { return day; } 
public String getadres() { return adres; } 
public String getresim() { return resimyol; } 

} 

public static void main(String args[]) { 
public void run() { 
      new KonumGoster().setVisible(true); 
      String json = null; 
      try { 
       json = readUrl("http://url.com/" 
         + "json.php"); 
      } catch (Exception ex) { 
       Logger.getLogger(KonumGoster.class.getName()).log(Level.SEVERE, null, ex); 
      } 

Gson gson = new Gson();  
JsonPojo[] array = gson.fromJson(gson, JsonPojo[].class); 
JsonPojo obj = new Gson().fromJson(json, JsonPojo.class); 
System.out.println("ID: " +obj.getId()); 
System.out.println("ID: " +obj.getName()); 
System.out.println("ID: " +obj.getlat()); 
System.out.println("ID: " +obj.getlon()); 
System.out.println("ID: " +obj.getspeed()); 
System.out.println("ID: " +obj.gethour()); 
System.out.println("ID: " +obj.getday()); 
System.out.println("ID: " +obj.getadres()); 
System.out.println("ID: " +obj.getresim()); 

} 

Wenn ich versuche ich so

run: Exception in thread "AWT-EventQueue-0" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 2 column 13 path $ at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:224) at com.google.gson.Gson.fromJson(Gson.java:887) at com.google.gson.Gson.fromJson(Gson.java:852) at com.google.gson.Gson.fromJson(Gson.java:801) at com.google.gson.Gson.fromJson(Gson.java:773) at KonumGoster$1.run(KonumGoster.java:145) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 2 column 13 path $ at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:385) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:213) ... 19 more BUILD SUCCESSFUL (total time: 5 minutes 5 seconds)

seine gib mir Fehler Projekt auszuführen

Answer 1

Gson gson = new Gson();  
JsonPojo[] array = gson.fromJson(gson, JsonPojo[].class); 
JsonPojo obj = new Gson().fromJson(json, JsonPojo.class); 

Die zweite Anweisung verwendet gson anstelle von json als das erste Argument von Gson :: fromJson. Wenn Sie dies in json ändern, wird GSON seine Aufgabe korrekt ausführen.

Und die Fehlermeldung in Ihrem Build stammt aus der dritten Anweisung, wo Sie versuchen, ein einzelnes Objekt aus einem JSON-Array von Objekten zu lesen. Sie benötigen nur die zweite Anweisung und dann iterieren Sie über ihr Ergebnis, um jedes Element zu drucken.

Gson gson = new Gson(); 
JsonPojo[] array = gson.fromJson(json, JsonPojo[].class); 
for (JsonPojo obj : array) { 
    System.out.println("id: " + obj.getId()); 
    // etc 
}