如何重写完整更新的json而不仅仅是嵌套部分

Question

我有一个名为test.json的json文件，看起来像这样:

{
  "Added": {
    "type": "K",
    "newmem": {
      "IDNew": {
        "id": "777709",
        "type": "LOP"
      },
      "birthDate": "2000-12-09"
    },
    "code": "",
    "newest": {
      "curlNew": "",
      "addedForNew": ""
    }
  }
}

我可以使用以下代码更新json中的id并写回文件：

FileReader reader = new FileReader(filePath); //where file path = D://.../test.json
String keyToUpdate = "Added.newmem.IDNew.id"
String[] keyArr = jsonKey.split("\\." );
String keyToUpdate = keyArr [keyArr.length-1]
keyArr.removeElement(keyArr, keyToUpdate)
for (String key: keyArr){ 
   jsonObject = (JSONObject) jsonObject.get(key);
}

jsonObject.put("id",12345);
FileOutputStream outputStream = new FileOutputStream(filePath);
byte[] strToBytes = jsonObject.toString().getBytes();
outputStream.write(strToBytes);

但是，它不是使用更新的值重写整个 json，而是只写入：

  {
    "id": "777709",
    "type": "LOP"
  }

我可以做什么来重写整个json，而不是只重写它的嵌套部分？

Answer 1

更新前的jsonObject只包含“IDNew”节点。

最好的方法是使用Jayway的xPath

private static final Configuration configuration = Configuration.builder()
    .jsonProvider(new JacksonJsonNodeJsonProvider())
    .mappingProvider(new JacksonMappingProvider())
    .build();



    String originalJson = "{\r\n"
            + "  \"Added\": {\r\n"
            + "    \"type\": \"K\",\r\n"
            + "    \"newmem\": {\r\n"
            + "      \"IDNew\": {\r\n"
            + "        \"id\": \"777709\",\r\n"
            + "        \"type\": \"LOP\"\r\n"
            + "      },\r\n"
            + "      \"birthDate\": \"2000-12-09\"\r\n"
            + "    },\r\n"
            + "    \"code\": \"\",\r\n"
            + "    \"newest\": {\r\n"
            + "      \"curlNew\": \"\",\r\n"
            + "      \"addedForNew\": \"\"\r\n"
            + "    }\r\n"
            + "  }\r\n"
            + "}";

JsonNode updatedJson = JsonPath.using(configuration).parse(originalJson).set("$.Added.IDNew.id", 12345).json();

System.out.println(updatedJson.toString());
}