使用Jackson更改嵌套JSON对象中的数组

Question

我试图通过指定该数组的路径来弄清楚如何更改JSON数组中的现有对象.

问题是我不知道如何指定数组的路径,以便可以更改它.我在那里尝试的每个方法都没有关于如何更改ObjectNode中的数组的示例.

这是我现在的代码,在其中我尝试通过指针表示法指定数组的路径来获取和更改数组,但是,这总是不返回数组:

构建POJO类不是一种选择.

我的json结构中的数组如下:

{
  RESULTS: {
     ATTACHMENTS: {
       ATTACHMENT: [{object}]
  }
 }
}

码:

   private JsonNode attachmentConversion(JsonNode object){
        final String ATTACHMENT_POINTER = "/RESULTS/ATTACHMENTS/ATTACHMENT"; //Path to the array
        ObjectNode OUTPUT = object.deepCopy();
        OUTPUT.remove("DETAILS");

        //Validate is an array - It properly fetches the array 
        if(object.at(ATTACHMENT_POINTER).isArray()){
            int counter=0;

            //Loop through attachment array - It properly fethes each object in the array
            for(final JsonNode objNode : object.at(ATTACHMENT_POINTER)){
                ObjectNode objectNode = objNode.deepCopy();
                OUTPUT.withArray(ATTACHMENT_POINTER) //HERE IS THE PROBLEM - How do I specify the path to the array I want to replace with a new object in the withArray api?  This always returns back as an empty array, even though the loop above properly fetches the array elements.
                        .set(counter
                                , objectNode
                                .replace("ATTACH_CONTENT"
                                        , xmlToJson.parseXmlToJson(objNode.get("ATTACH_CONTENT")
                                        .asText())));
                counter = counter+1;
            }
        }
        return new ObjectMapper()
                .createObjectNode()
                .set("customertopology", OUTPUT);
    }

Answer 1

我认为你不想改变传递给方法的对象，所以你做了一个深拷贝。并且您想返回一个新的 JSON 对象。

到目前为止我是对的吗？如果是，当您制作了深层副本时，请使用它，遍历您关注的数组的每个元素，并用您想要的值替换 Node 值。

private static JsonNode attachmentConversion(JsonNode object){



    final String ATTACHMENT_POINTER = "/RESULTS/ATTACHMENTS/ATTACHMENT"; //Path to the array
    ObjectNode OUTPUT = object.deepCopy();
    OUTPUT.remove("DETAILS");

    //Validate is an array - It properly fetches the array
    if(OUTPUT.at(ATTACHMENT_POINTER).isArray()){
        int counter=0;

        //Loop through attachment array - It properly fethes each object in the array
        for(final JsonNode objNode : OUTPUT.at(ATTACHMENT_POINTER)){
            ((ObjectNode)objNode).replace("ATTACH_CONTENT", xmlToJson.parseXmlToJson(objNode.get("ATTACH_CONTENT"));
        }

    }
    return new ObjectMapper()
            .createObjectNode()
            .set("customertopology", OUTPUT);
}