[英]Storing JSON Object in Key Value Field
I have a data structure to store some data in that accepts very specific JSON structure: 我有一个数据结构来存储一些接受非常特定的JSON结构的数据:
{ "NVPS": [ "NAME": "formData", "VALUE" : "myData" ] } {“ NVPS”:[“ NAME”:“ formData”,“ VALUE”:“ myData”]}
I'm serialising a large object that contains sub-objects into a string which I'm putting in the value field - replaces "myData" above. 我正在将一个包含子对象的大对象序列化为一个字符串,并将其放入值字段中-替换上面的“ myData”。
// Serialise the form object
Map<String, String> formData = new HashMap<String, String>();
String foJson = JsonUtils.serializeJson(formObject); // returns a serialised version of formObject
formData.put("NAME", "formData");
formData.put("VALUE", foJson);
String storeJson = JsonUtils.serializeJson(formData);
storeJson = "{\"NVPS\":[" + storeJson + "]}";
Can anyone suggest a less ugly way I might be able to do this? 任何人都可以建议一个不太丑陋的方式来执行此操作吗? I'm particularly not that happy with the last line where I create a JSON string by hand. 我对手动创建JSON字符串的最后一行不满意。
Here is the serializeJson() function from JsonUtils: 这是来自JsonUtils的serializeJson()函数:
public static String serializeJson(Object dto) {
String result = null;
try {
ObjectWriter writer = mapper.writer();
result = writer.writeValueAsString(dto);
} catch (Exception e) {
String errorMsg = "Exception in serializeJson input= " + dto;
logger.error(JSON_UTILS_DEBUG_TEXT + errorMsg);
throw new RuntimeException(e);
}
return result;
}
It's using Jackson's ObjectWriter com.fasterxml.jackson.databind.ObjectWriter. 它使用Jackson的ObjectWriter com.fasterxml.jackson.databind.ObjectWriter。
How can I clean up the first block of code? 如何清除第一段代码?
Be aware that { "NVPS": [ "NAME": "formData", "VALUE" : "myData" ] }
is not a valid JSON. 请注意{ "NVPS": [ "NAME": "formData", "VALUE" : "myData" ] }
不是有效的JSON。
For valid JSON, you can try: 对于有效的JSON,您可以尝试:
ObjectMapper mapper = new ObjectMapper();
ArrayNode arrayNode = mapper.createArrayNode();
arrayNode.addObject().put("NAME", "formData");
arrayNode.addObject().put("VALUE", "myData");
ObjectNode rootNode = mapper.createObjectNode();
rootNode.set("NVPS", arrayNode);
String json = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
It will give you: 它会给你:
{
"NVPS" : [ {
"NAME" : "formData"
}, {
"VALUE" : "myData"
} ]
}
You also can try: 您也可以尝试:
ObjectMapper mapper = new ObjectMapper();
ObjectNode objectNode = mapper.createObjectNode();
objectNode.put("NAME", "formData");
objectNode.put("VALUE", "myData");
ObjectNode rootNode = mapper.createObjectNode();
rootNode.set("NVPS", objectNode);
String json = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
And the result will be: 结果将是:
{
"NVPS" : {
"NAME" : "formData",
"VALUE" : "myData"
}
}
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