JodaTime LocalDate JSON反序列化ISO 8601問題

Question

我有一個LocalDate被序列化爲JSON爲："2014-10-17"。當我嘗試用下面提到的代碼解析它時，我得到一個格式不正確的logcat錯誤。

這裏是logcat的：

10-16 22:55:30.123: E/AndroidRuntime(31319): FATAL EXCEPTION: main 
10-16 22:55:30.123: E/AndroidRuntime(31319): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nanospark.cnc/com.nanospark.cnc.MainActivity}: java.lang.IllegalArgumentException: Invalid format: ""2014-10-17"" 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.ActivityThread.access$600(ActivityThread.java:141) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.os.Looper.loop(Looper.java:137) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.ActivityThread.main(ActivityThread.java:5103) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at java.lang.reflect.Method.invokeNative(Native Method) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at java.lang.reflect.Method.invoke(Method.java:525) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at dalvik.system.NativeStart.main(Native Method) 
10-16 22:55:30.123: E/AndroidRuntime(31319): Caused by: java.lang.IllegalArgumentException: Invalid format: ""2014-10-17"" 
10-16 22:55:30.123: E/AndroidRuntime(31319): at org.joda.time.format.DateTimeFormatter.parseLocalDateTime(DateTimeFormatter.java:854) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at org.joda.time.format.DateTimeFormatter.parseLocalDate(DateTimeFormatter.java:798) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.nanospark.cnc.LocalDateSerializer.deserialize(LocalDateSerializer.java:37) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.nanospark.cnc.LocalDateSerializer.deserialize(LocalDateSerializer.java:1) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:95) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:183) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.Gson.fromJson(Gson.java:805) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.Gson.fromJson(Gson.java:770) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.google.gson.Gson.fromJson(Gson.java:719) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.nanospark.cnc.GlobalData.retrieveGlobalDataFromStorage(GlobalData.java:115) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at com.nanospark.cnc.MainActivity.onCreate(MainActivity.java:35) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.Activity.performCreate(Activity.java:5133) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
10-16 22:55:30.123: E/AndroidRuntime(31319): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 
10-16 22:55:30.123: E/AndroidRuntime(31319): ... 11 more 

以及該處理序列化和反序列化類：

public class LocalDateSerializer implements JsonDeserializer<LocalDate>, JsonSerializer<LocalDate> 
{ 
    private static final DateTimeFormatter DATE_FORMAT = ISODateTimeFormat.date(); 

    @Override 
    public LocalDate deserialize(final JsonElement je, final Type type, 
          final JsonDeserializationContext jdc) throws JsonParseException 
    { 
     final String dateAsString = je.getAsString(); 
     Log.v("My Date Deserialized", je.getAsString()); 
     if (je.isJsonNull() || dateAsString.length()==0) 
     { 
     return null; 
     } 
     else 
     { 
     return DATE_FORMAT.parseLocalDate(dateAsString);   
     } 
    } 

    @Override 
    public JsonElement serialize(final LocalDate src, final Type typeOfSrc, 
           final JsonSerializationContext context) 
    { 
     String retVal; 
     if (src == null) 
     { 
     retVal = ""; 
     } 
     else 
     { 
     retVal = DATE_FORMAT.print(src); 
     } 
     Log.v("My Date Serialized", retVal); 
     return new JsonPrimitive(retVal); 
    } 
} 

是yyyy-MM-dd沒有考慮ISO 8601格式？

Answer 1

該問題是由於我的dateAsString值附加引號引起的。

只是簡單地用parseLocalDate(dateAsString)代替parseLocalDate(je.getAsString())修復了問題。