如何从 java SpringBoot 中的 json 中删除“nameValuePairs”键？

Question

我有以下方法，当在字符串中接收 xml 时，将其转换为CitiMarketSSAEvent类型的对象

public CitiMarketSSAEvent convertXmlToObject(String xml){
    CitiMarketSSAEvent citiMarket = null;
    
    JAXBContext jaxbContext =     JAXBContext.newInstance(CitiMarketSSAEvent.class);
    Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
    StringReader reader = new StringReader(xml);
    citiMarket = (CitiMarketSSAEvent) unmarshaller.unmarshal(reader);
    return citiMarket;
}

然后我有以下方法将 class 的对象转换为 json

public String convertObjectToJson(CitiMarketSSAEvent citiMarketObject) {
    GsonBuilder gsonBuilder = new GsonBuilder();
    gsonBuilder.setPrettyPrinting();
    gsonBuilder.disableHtmlEscaping();

    Gson gson = gsonBuilder.create();
    return gson.toJson(citiMarketObject, CitiMarketSSAEvent.class);
}

并将 json 绘制如下

 { "header":{ "name": "transactionCount", "version": "2.0", "code": "1530", "country": "MX", "domain": "counts", "time": "2018-10-11 11:20:34.323 GMT", }, "body":{ "INPUNT": "I", "MESSAGE_01": "RSTW", "MESSAGE_02": "MNXTYP", "MESSAGE_03": "RSTWERDCV", "SEND_TIME": "20-NOV-2011 04:53:04 pm", "RCV_ID": "ABGRCV", "FORMAT0_MONTO": "200,000,300.00", "FORMATO_MONEDA": "USD", "CONTROL_01": "MSG1RCVSND", "CONTROL_02": "MSG2RCVSND", "CONTROL_03": "MSG3RCVSND", } }

但我想以这样的方式将“事件”键添加到 json 中：

 { "event":{ "header":{ "name": "transactionCount", "version": "2.0", "code": "1530", "country": "MX", "domain": "counts", "time": "2018-10-11 11:20:34.323 GMT", }, "body":{ "INPUNT": "I", "MESSAGE_01": "RSTW", "MESSAGE_02": "MNXTYP", "MESSAGE_03": "RSTWERDCV", "SEND_TIME": "20-NOV-2011 04:53:04 pm", "RCV_ID": "ABGRCV", "FORMAT0_MONTO": "200,000,300.00", "FORMATO_MONEDA": "USD", "CONTROL_01": "MSG1RCVSND", "CONTROL_02": "MSG2RCVSND", "CONTROL_03": "MSG3RCVSND", } } }

然后我使用JSONObject如下修改了我的方法

public String convertObjectToJson(CitiMarketSSAEvent citiMarketObject) {
        GsonBuilder gsonBuilder = new GsonBuilder();
        gsonBuilder.setPrettyPrinting();
        gsonBuilder.disableHtmlEscaping();
        
        JSONObject jsonObj = new JSONObject();
        jsonObj.put("event",citiMarketObject);
        
        Gson gson = gsonBuilder.create();
        return gson.toJson(jsonObj, JSONObject.class);                                            
  }

它抛出 json 但添加了键“nameValuePairs”，如何删除它？ 或者我还能怎么做才能添加“事件”键？

 { "nameValuePairs":{ "event":{ "header":{ "name": "transactionCount", "version": "2.0", "code": "1530", "country": "MX", "domain": "counts", "time": "2018-10-11 11:20:34.323 GMT", }, "body":{ "INPUNT": "I", "MESSAGE_01": "RSTW", "MESSAGE_02": "MNXTYP", "MESSAGE_03": "RSTWERDCV", "SEND_TIME": "20-NOV-2011 04:53:04 pm", "RCV_ID": "ABGRCV", "FORMAT0_MONTO": "200,000,300.00", "FORMATO_MONEDA": "USD", "CONTROL_01": "MSG1RCVSND", "CONTROL_02": "MSG2RCVSND", "CONTROL_03": "MSG3RCVSND", } } } }

Answer 1

试试这个代码，它应该做你需要的。

package com;


import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.LinkedHashMap;

public class Main {
    public static void main(String[] args) throws JsonProcessingException {
        String json = "{\n" +
                "    \"header\":{\n" +
                "        \"name\": \"transactionCount\",\n" +
                "        \"version\": \"2.0\",\n" +
                "        \"code\": \"1530\",\n" +
                "        \"country\": \"MX\",\n" +
                "        \"domain\": \"counts\",\n" +
                "        \"time\": \"2018-10-11 11:20:34.323 GMT\"\n" +
                "    },\n" +
                "    \"body\":{\n" +
                "        \"INPUNT\": \"I\",\n" +
                "        \"MESSAGE_01\": \"RSTW\",\n" +
                "        \"MESSAGE_02\": \"MNXTYP\",\n" +
                "        \"MESSAGE_03\": \"RSTWERDCV\",\n" +
                "        \"SEND_TIME\": \"20-NOV-2011 04:53:04 p.m.\",\n" +
                "        \"RCV_ID\": \"ABGRCV\",\n" +
                "        \"FORMAT0_MONTO\": \"200,000,300.00\",\n" +
                "        \"FORMATO_MONEDA\": \"USD\",\n" +
                "        \"CONTROL_01\": \"MSG1RCVSND\",\n" +
                "        \"CONTROL_02\": \"MSG2RCVSND\",\n" +
                "        \"CONTROL_03\": \"MSG3RCVSND\"\n" +
                "    }\n" +
                "}";

        ObjectMapper objectMapper = new ObjectMapper();
        LinkedHashMap hashMap = objectMapper.readValue(json, LinkedHashMap.class);
        Event event =  new Event(hashMap);
        System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(event));
    }

    public static class Event {
        @JsonProperty("event")
        private LinkedHashMap event;
        public Event(LinkedHashMap event){
            this.event = event;
        }
    }
}