[英]java uses gson to parse from json format to map issues
我想使用Google的gson從json測試解析為映射,這是我的代碼,但出現異常:
Gson gson = new GsonBuilder().serializeNulls().setLenient().setPrettyPrinting().create();
Map<String, List<String>> map = new LinkedHashMap<>();
map = gson.fromJson("The json text", new TypeToken<Map<String, List<String>>>(){}.getType());
json文字為:
{
"Worker": {
"127.0.0.1:9001",
"127.0.0.1:9002",
"127.0.0.1:9003",
"127.0.0.1:9004",
"127.0.0.1:9005",
"127.0.0.1:9006",
"127.0.0.1:9007"
}
}
錯誤消息是:
Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 2 column 16 path $.
at com.google.gson.Gson.fromJson(Gson.java:891)
at com.google.gson.Gson.fromJson(Gson.java:844)
at com.google.gson.Gson.fromJson(Gson.java:793)
at TestBasic.TestBasic.main(TestBasic.java:140)
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 2 column 16 path $.
at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:351)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:80)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:187)
at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145)
at com.google.gson.Gson.fromJson(Gson.java:879)
... 3 more
您的json文本無效。 Worker中的字符串標記應使用json數組[]
括起來
"Worker": [
"127.0.0.1:9001",
"127.0.0.1:9002",
"127.0.0.1:9003",
"127.0.0.1:9004",
"127.0.0.1:9005",
"127.0.0.1:9006",
"127.0.0.1:9007"
]
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