假设 Jackson 中根节点的所有子节点都是字段名是否合理？
Is it reasonable to assume that all children of root node in Jackson are field names?
我正在尝试遍历 JsonNode 树，我编写了以下代码段，该代码段遍历根节点的子节点并从中获取文本，我假设这将是一个字段名称。
JsonNode rootNode = new ObjectMapper().readTree(jsonParser);
for (JsonNode node : rootNode){
String fieldName = node.asText(); // <- is it safe to assume this?
JsonNode value = node.get(fieldName);
}
我已阅读this similar post, but the accepted answer simply doesn't work because both fields and fieldNames return iterator, which cannot be iterated through a foreach loop just by itself as far as I know。
另一个最受赞誉的答案有效，但我想知道上面片段的假设是否仍然有效。
没有
JsonNode#iterator() 的 javadoc 指出
Same as calling elements(); implemented so that convenience "for-each"
loop can be used for looping over elements of JSON Array constructs.
JsonNode#elements() 的 javadoc 指出
Method for accessing all value nodes of this Node, iff this node is a
JSON Array or Object node. In case of Object node, field names (keys)
are not included, only values. For other types of nodes, returns empty
iterator.
所以返回的元素是对象节点的每个键值对的值。对于数组节点，它是数组元素。
我正在尝试遍历 JsonNode 树，我编写了以下代码段，该代码段遍历根节点的子节点并从中获取文本，我假设这将是一个字段名称。
JsonNode rootNode = new ObjectMapper().readTree(jsonParser);
for (JsonNode node : rootNode){
String fieldName = node.asText(); // <- is it safe to assume this?
JsonNode value = node.get(fieldName);
}
我已阅读this similar post, but the accepted answer simply doesn't work because both fields and fieldNames return iterator, which cannot be iterated through a foreach loop just by itself as far as I know。
另一个最受赞誉的答案有效，但我想知道上面片段的假设是否仍然有效。
没有
JsonNode#iterator() 的 javadoc 指出
Same as calling
elements();implemented so that convenience "for-each" loop can be used for looping over elements of JSON Array constructs.
JsonNode#elements() 的 javadoc 指出
Method for accessing all value nodes of this Node, iff this node is a JSON Array or Object node. In case of Object node, field names (keys) are not included, only values. For other types of nodes, returns empty iterator.
所以返回的元素是对象节点的每个键值对的值。对于数组节点，它是数组元素。