Java 如何将 JsonNode 转换为 ObjectNode
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How to convert JsonNode to ObjectNode
提问by Mr. Noddy
I have a com.fasterxml JsonNodeobject with some data. I need to do some manipulation on its data. I googled for answer but didn't got it properly. Can you please suggest me how to manipulate JsonNode data.
I have also tried to convert JsonNodeto ObjectNodeas follows
我有一个com.fasterxml JsonNode带有一些数据的对象。我需要对其数据进行一些操作。我用谷歌搜索答案，但没有得到正确的答案。您能否建议我如何操作 JsonNode 数据。我也试图转换JsonNode到ObjectNode如下
ObjectNode objectNode = (ObjectNode)filterJson;
but its giving following exception....
但它给出了以下例外......
java.lang.ClassCastException: com.fasterxml.Hymanson.databind.node.TextNode cannot be cast to
com.fasterxml.Hymanson.databind.node.ObjectNode
please help!!
请帮忙！！
采纳答案by Mr. Noddy
Finally, I got the solution as follows...
最后，我得到了以下解决方案......
JsonNode jsonNode = Json.toJson("Json String");
ObjectNode node = (ObjectNode) new ObjectMapper().readTree(jsonNode.asText());
//perform operations on node
jsonNode = (JsonNode) new ObjectMapper().readTree(node.toString());
or another one as below...
或另一种如下...
ObjectNode node = (ObjectNode) new ObjectMapper().readTree("Json String")
//perform operations on node
jsonNode = (JsonNode) new ObjectMapper().readTree(node.toString());
but I don't know if this is good approach or not ? If there is any better than above, please let me know. Thank you!
但我不知道这是否是好方法？如果有比上面更好的，请告诉我。谢谢！
回答by Daniele Licitra
You can convert a JsonNodein an ObjectNodein this simple way:
您可以JsonNode通过ObjectNode这种简单的方式将 a 转换为an ：
ObjectNode objectNode = jsonNode.deepCopy();
Available from Hymanson 2.0and tested with Hymanson 2.4.0
可从 Hymanson 2.0 获得并使用 Hymanson 2.4.0 进行测试
回答by Daejong Lin
I try it some times, it will be ok! You only define a Student Classto map the properties. Then you could convert the jsonNodeto StudentObject.
我试了几次，会好的！您只需定义一个Student Class来映射属性。然后你可以将对象转换jsonNode为Student对象。
Student student = objectMapper.convertValue(jsonNode1, Student.class);
Student student = objectMapper.convertValue(jsonNode1, Student.class);
I think this will be suitable for your need!
我认为这将适合您的需要！
回答by dozer
I had this error too although in my case it was a stupid mistake.
I accidentally imported org.codehaus.Hymanson.node.ObjectNodeinstead of com.fasterxml.Hymanson.databind.node.ObjectNode.
Using the Hymanson ObjectNode fixed the issuse.
我也有这个错误，尽管在我的情况下这是一个愚蠢的错误。我不小心导入org.codehaus.Hymanson.node.ObjectNode而不是com.fasterxml.Hymanson.databind.node.ObjectNode. 使用 Hymanson ObjectNode 解决了这个问题。
