Java：合并两个JSON对象而不进行迭代

Question

我有两个JSON对象，例如

{  
   "key1":"value1",
   "key2":"value2",
   "key3":"value3",
   "key4":"value4"
}

和

{
   "key2":"value1",
   "key4":"value2",
   "key6":"value3",
   "key8":"value4"
}

我想将这两个JSON对象合并为单个Json对象，而无需遍历每个键，最终结果应为

{
   "key1":"value1",
   "key2":"value1",
   "key3":"value3",
   "key4":"value2",
   "key6":"value3",
   "key8":"value4"
}

Answer 1

使用任何Json Mapper（例如Jackson）将json转换为Map。

ObjectMapper mapper = new ObjectMapper();
Map<String, Object> map = mapper.readValue(json, new TypeReference<Map<String, String>>(){})

一旦获得了两个这样的地图，就可以将它们合并

Map<String, Object> mergedMap = new HashMap<>();
mergedMap.putAll(map1);
mergedMap.putAll(map2);
String json = mapper.writeValueAsString(mergedMap);