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android - Gson 无法解析日期

问题描述

在我的应用程序中的一些用户抛出致命异常：com.google.gson.JsonSyntaxException。我使用 gson 向磁盘 LRU 缓存写入和读取数据。当我从缓存中读取数据时，我如何理解这个异常。

这就是我创建 json 实例的方式：

Gson gson = new Gson();

此异常发生在 Android 5、6、7、8 中。这是来自 Crashlytics 的统计数据。

这是来自 Crashlytics 的异常堆栈跟踪：

Fatal Exception: com.google.gson.JsonSyntaxException: Nov 5, 2019 20:18:24
       at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:87)
       at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:75)
       at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:46)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
       at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
       at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
       at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
       at com.google.gson.Gson.fromJson(Gson.java:927)
       at com.google.gson.Gson.fromJson(Gson.java:892)
       at com.google.gson.Gson.fromJson(Gson.java:841)
       at com.google.gson.Gson.fromJson(Gson.java:813)
       at com.example.data.repository.MbCacheImpl.getDashboard(MbCacheImpl.java:44)
       at com.example.data.repository.DataRepository.getDashboard(DataRepository.java:64)
       at com.example.ui.main.main.TabMainViewModel.loadDashboard(TabMainViewModel.java:289)
       at com.example.ui.main.main.TabMainViewModel.loadData(TabMainViewModel.java:260)
       at com.example.ui.base.BaseDataViewModel$onAttach$1.onAvailable(BaseDataViewModel.java:124)
       at android.net.ConnectivityManager$CallbackHandler.handleMessage(ConnectivityManager.java:3108)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:154)
       at android.os.HandlerThread.run(HandlerThread.java:61)

Caused by java.text.ParseException: Failed to parse date ["Nov 5, 2019
                20:18:24"]: Invalid number: Nov 
                       at com.google.gson.internal.bind.util.ISO8601Utils.parse(ISO8601Utils.java:274)
       at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:85)
       at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:75)
       at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:46)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
       at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
       at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
       at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
       at com.google.gson.Gson.fromJson(Gson.java:927)
       at com.google.gson.Gson.fromJson(Gson.java:892)
       at com.google.gson.Gson.fromJson(Gson.java:841)
       at com.google.gson.Gson.fromJson(Gson.java:813)
       at com.example.data.repository.MbCacheImpl.getDashboard(MbCacheImpl.java:44)
       at com.example.data.repository.DataRepository.getDashboard(DataRepository.java:64)
       at com.example.ui.main.main.TabMainViewModel.loadDashboard(TabMainViewModel.java:289)
       at com.example.ui.main.main.TabMainViewModel.loadData(TabMainViewModel.java:260)
       at com.example.ui.base.BaseDataViewModel$onAttach$1.onAvailable(BaseDataViewModel.java:124)
       at android.net.ConnectivityManager$CallbackHandler.handleMessage(ConnectivityManager.java:3108)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:154)
       at android.os.HandlerThread.run(HandlerThread.java:61)

Caused by java.lang.NumberFormatException: Invalid number: Nov
                       at com.google.gson.internal.bind.util.ISO8601Utils.parseInt(ISO8601Utils.java:311)
       at com.google.gson.internal.bind.util.ISO8601Utils.parse(ISO8601Utils.java:129)
       at com.google.gson.internal.bind.DateTypeAdapter.deserializeToDate(DateTypeAdapter.java:85)
       at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:75)
       at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:46)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
       at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
       at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
       at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:131)
       at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:222)
       at com.google.gson.Gson.fromJson(Gson.java:927)
       at com.google.gson.Gson.fromJson(Gson.java:892)
       at com.google.gson.Gson.fromJson(Gson.java:841)
       at com.google.gson.Gson.fromJson(Gson.java:813)
       at com.example.data.repository.MbCacheImpl.getDashboard(MbCacheImpl.java:44)
       at com.example.data.repository.DataRepository.getDashboard(DataRepository.java:64)
       at com.example.ui.main.main.TabMainViewModel.loadDashboard(TabMainViewModel.java:289)
       at com.example.ui.main.main.TabMainViewModel.loadData(TabMainViewModel.java:260)
       at com.example.ui.base.BaseDataViewModel$onAttach$1.onAvailable(BaseDataViewModel.java:124)
       at android.net.ConnectivityManager$CallbackHandler.handleMessage(ConnectivityManager.java:3108)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:154)
       at android.os.HandlerThread.run(HandlerThread.java:61)

标签： androidgson

解决方案

Caused by java.text.ParseException: Failed to parse date ["Nov 5, 2019 20:18:24"]: Invalid number: Nov

Try to setup date format for parsing purposes.

Gson gson = new GsonBuilder().setDateFormat("MMM dd, yyyy HH:mm:ss").create();

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