您可以尝试使用以下算法:

You can try with this algorithm:

1. 将JSON读取为Map.
2. 平面地图
3. 使用ObjectMapper将Map转换为POJO.

实施可能看起来像这样:

Implementation could looks like this:

ObjectMapper mapper = new ObjectMapper();

Map<String, Map<String, String>> map = mapper.readValue(new File("X:/test.json"), Map.class);
Map<String, String> result = new HashMap<String, String>();
for (Entry<String, Map<String, String>> entry : map.entrySet()) {
    result.putAll(entry.getValue());
}

System.out.println(mapper.convertValue(result, MyPojo.class));