[英]Serialize java.nio.file.Path with JsonBuilder in Groovy
[英]How to serialize java.nio.file.Path with Gson?
嘗試序列化包含java.nio.file.Path
Object
,我得到了java.lang.StackOverflowError
即使我寫道:
public class PathConverter implements JsonDeserializer<Path>, JsonSerializer<Path> {
@Override
public Path deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
return Paths.get(jsonElement.getAsString());
}
@Override
public JsonElement serialize(Path path, Type type, JsonSerializationContext jsonSerializationContext) {
return new JsonPrimitive(path.toString());
}
}
並應用它:
String json = new GsonBuilder()
.registerTypeAdapter(Path.class, new PathConverter())
.create()
.toJson(constructorSetup, new TypeToken<ConstructorSetup>() {}.getType());
我仍然無法序列化這個類:
public class ConstructorSetup {
private Path appIconMimmapDirPathOnPc;
}
Stacktrace :(完全在pastebin上 )
Exception in thread "main" java.lang.StackOverflowError
at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:375)
at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
...
at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:380)
at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:355)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
at com.google.gson.Gson.getAdapter(Gson.java:356)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:82)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:118)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
at com.google.gson.Gson.getAdapter(Gson.java:356)
...
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:82)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:81)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:118)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
at com.google.gson.Gson.getAdapter(Gson.java:356)
有解決方案嗎
你的問題是Path
是一個interface
。 假設您使用了Paths.get("/")
,它將在我的Windows PC上創建類似WindowsPath
實例。 現在,您必須告訴GSON如何反序列化此類型:
ConstructorSetup setup = new ConstructorSetup();
setup.setAppIconMimmapDirPathOnPc(Paths.get("/"));
// here we get actual class type of our Path object
Class classT = setup.getAppIconMimmapDirPathOnPc().getClass();
Gson gson = new GsonBuilder().registerTypeAdapter(classT, new MyPathConverter())
您可以使用的另一種方法是registerTypeHierarchyAdapter
:
.registerTypeHierarchyAdapter(Path.class, new MyPathConverter())
typeHierarchyAdapter的目的是覆蓋類型的所有子類型需要相同表示的情況,這與Path
的情況完全相同。
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