Jackson 是否允许您自定义它如何序列化 EnumMap 键?例如,如果我有
public enum MyKey
{
ABC, DEF, XYZ;
public String getKey()
{
return "my-key-" + ordinal();
}
}
还有一些
public class MyObject
{
private final Map<MyKey,String> map = new EnumMap<>(MyKey.class);
public MyObject()
{
map.put(MyKey.ABC, "foo");
map.put(MyKey.DEF, "bar");
map.put(MyKey.XYZ, "baz");
}
public Map<MyKey,String> getMap()
{
return map;
}
}
然后杰克逊将序列MyObject
化为
{"map":{"ABC":"foo","DEF":"bar","XYZ":"baz"}}
.
相反,我希望它像
{"map":{"my-key-0":"foo","my-key-1":"bar","my-key-2":"baz"}}
. 我不想覆盖任何toString()
内容以使其正常工作。这在杰克逊有可能吗?
我试过这样做:
public class MyKeySerializer extends JsonSerializer<MyKey>
{
@Override
public void serialize(MyKey value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException
{
jgen.writeString(value.getKey());
}
}
然后添加
public class MyObject
{
...
@JsonSerialize(keyUsing = MyKeySerializer.class)
public Map<MyKey,String> getMap()
{
return map;
}
...
}
但这失败了,但有一个org.codehaus.jackson.JsonGenerationException: Can not write text value, expecting field name
例外。
有任何想法吗???