如何在JSON文件中转义字符串值并替换

Question

在下面的代码中，我正在替换＆＃34; con＆＃34;标记值与新声明的字符串＆＃34; con＆＃34;值（的＆＃34; {\＆＃34; payload_dl \＆＃34;：{\＆＃34; deveui \＆＃34;：\＆＃34; 23456 \＆＃34;}}＆＃ 34; ）。但是这样做时，值将存储为普通字符串而不包含转义字符。

如何在jsonNode中替换时转义字符串值。

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.jayway.jsonpath.JsonPath;

        ObjectMapper mapper = new ObjectMapper();
        JsonFactory jsonFactory = new JsonFactory();            
        JsonParser jp = jsonFactory.createJsonParser({"m2m:cin":{"con":"{\"payload_dl\":{\"deveui\":\"765348\"}});
        jp.setCodec(new ObjectMapper());
        JsonNode jsonNode = jp.readValueAsTree();

        String con = "{\"payload_dl\":{\"deveui\":\"23456\"}}";

        changePayloadContent(jsonNode, "con", con); 

        logger.info("Modified Payload content ::: "+ jsonNode);

        return mapper.writeValueAsString(jsonNode);

changePayloadContent方法，

public static void changePayloadContent(JsonNode parent, String fieldName, String newValue) throws JsonProcessingException, IOException {
        logger.debug("Start of change");
        ObjectMapper mapper = new ObjectMapper();
        if (parent.has(fieldName)) {
            try {
                JsonNode jsonNode = mapper.readTree(newValue);
                ((ObjectNode) parent).put(fieldName, jsonNode);
            } catch (Exception e) {
                logger.info("GenericFlow::replace::NewValue is not JSON String");
                ((ObjectNode) parent).put(fieldName, newValue);
            }
        }
        for (JsonNode child : parent) {
            changePayloadContent(child, fieldName, newValue);
        }
        logger.debug("End of change");
    }