jsonpath 判断是否包含_JsonNode findPath方法详解 JsonNode判断是否为空详解

在使用com.fasterxml.jackson.databind.JsonNode的findPath方法,会用于判断是否是否正确的查找到结果,path()只能查找儿子节点,而findPath则会查找子孙节点,对于层级较多的json使用findPath更加便利!

话不多说直接贴代码,创建JsonNode的过程请忽略.

JSONObject jsonObject = new JSONObject();

jsonObject.put("a", "a");

jsonObject.put("B", "B");

jsonObject.put("C", "C");

jsonObject.put("D", "D");

JSONObject jsonObject2 = new JSONObject();

jsonObject2.put("a2", "a2");

jsonObject2.put("B2", "B2");

jsonObject2.put("C2", "C2");

jsonObject2.put("D2", "D2");

jsonObject.put("obj", jsonObject2);

jsonObject.put("arr", Collections.singletonList(jsonObject2));

JsonNode warehouseOrderJsonNode = (JsonNode) YGJson.fromJson(jsonObject.toJSONString(), JsonNode.class);

boolean missingNode1 = warehouseOrderJsonNode.findPath("aaaa").isNull();//false

boolean missingNode2 = warehouseOrderJsonNode.findPath("aaaa").isEmpty();//true

boolean missingNode3 = warehouseOrderJsonNode.findPath("aaaa").isMissingNode();//true

String missingNode4 = warehouseOrderJsonNode.findPath("aaaa").asText();//""

boolean missingNode5 = warehouseOrderJsonNode.findPath("aaaa").isArray();//false

boolean missingNode6 = warehouseOrderJsonNode.findPath("aaaa").isObject();//false

boolean child1 = warehouseOrderJsonNode.findPath("a").isNull();//false

boolean child2 = warehouseOrderJsonNode.findPath("a").isEmpty();//true

boolean child3 = warehouseOrderJsonNode.findPath("a").isMissingNode();//false

String child4 = warehouseOrderJsonNode.findPath("a").asText();//"a"

boolean child5 = warehouseOrderJsonNode.findPath("aaaa").isArray();//false

boolean child6 = warehouseOrderJsonNode.findPath("aaaa").isObject();//false

boolean son1 = warehouseOrderJsonNode.findPath("a2").isNull();//false

boolean son2 = warehouseOrderJsonNode.findPath("a2").isEmpty();//true

boolean son3 = warehouseOrderJsonNode.findPath("a2").isMissingNode();//false

String son4 = warehouseOrderJsonNode.findPath("a2").asText();//"a2"

boolean son5 = warehouseOrderJsonNode.findPath("aaaa").isArray();//false

boolean son6 = warehouseOrderJsonNode.findPath("aaaa").isObject();//false

boolean obj1 = warehouseOrderJsonNode.findPath("obj").isNull();//false

boolean obj2 = warehouseOrderJsonNode.findPath("obj").isEmpty();//false

boolean obj3 = warehouseOrderJsonNode.findPath("obj").isMissingNode();//false

String obj4 = warehouseOrderJsonNode.findPath("obj").asText();//""

boolean obj5 = warehouseOrderJsonNode.findPath("obj").isArray();//false

boolean obj6 = warehouseOrderJsonNode.findPath("obj").isObject();//true

boolean arr1 = warehouseOrderJsonNode.findPath("arr").isNull();//false

boolean arr2 = warehouseOrderJsonNode.findPath("arr").isEmpty();//false

boolean arr3 = warehouseOrderJsonNode.findPath("arr").isMissingNode();//false

String arr4 = warehouseOrderJsonNode.findPath("arr").asText();//""

boolean arr5 = warehouseOrderJsonNode.findPath("arr").isArray();//true

boolean arr6 = warehouseOrderJsonNode.findPath("arr").isObject();//false

将以上方法的findPath()替换为path()后所有的返回值不变.

附上debug的结果图