com.livk.commons.jackson.util.JsonNodeUtils Maven / Gradle / Ivy
/*
* Copyright 2021-2024 spring-boot-extension the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.livk.commons.jackson.util;
import com.fasterxml.jackson.core.JsonPointer;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Streams;
import com.livk.commons.util.ObjectUtils;
import lombok.experimental.UtilityClass;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
*
* JsonNodeUtils
*
*
* @author livk
*/
@UtilityClass
public class JsonNodeUtils {
/**
* The String set.
*/
public final TypeReference> STRING_SET = new TypeReference<>() {
};
/**
* The String object map.
*/
public final TypeReference> STRING_OBJECT_MAP = new TypeReference<>() {
};
/**
* 查找某个节点，转成string
* @param jsonNode the json node
* @param fieldName the field name
* @return the string
*/
public String findStringValue(JsonNode jsonNode, String fieldName) {
if (jsonNode == null) {
return null;
}
JsonNode value = jsonNode.findValue(fieldName);
return (value != null && value.isTextual()) ? value.asText() : null;
}
/**
* 查找某个节点
* @param jsonNode the json node
* @param fieldName the field name
* @return the json node
*/
public JsonNode findObjectNode(JsonNode jsonNode, String fieldName) {
if (jsonNode == null) {
return null;
}
JsonNode value = jsonNode.findValue(fieldName);
return (value != null && value.isObject()) ? value : null;
}
/**
* 查找某个节点
* @param the type parameter
* @param jsonNode the json node
* @param fieldName the field name
* @param valueTypeReference the value type reference
* @param mapper the mapper
* @return the t
*/
public T findValue(JsonNode jsonNode, String fieldName, TypeReference valueTypeReference,
ObjectMapper mapper) {
JavaType javaType = TypeFactoryUtils.javaType(valueTypeReference);
return findValue(jsonNode, fieldName, javaType, mapper);
}
/**
* 查找某个节点
* @param the type parameter
* @param jsonNode the json node
* @param fieldName the field name
* @param type the type
* @param mapper the mapper
* @return the t
*/
public T findValue(JsonNode jsonNode, String fieldName, Class type, ObjectMapper mapper) {
JavaType javaType = TypeFactoryUtils.javaType(type);
return findValue(jsonNode, fieldName, javaType, mapper);
}
/**
* 查找某个节点
* @param the type parameter
* @param jsonNode the json node
* @param fieldName the field name
* @param javaType the java type
* @param mapper the mapper
* @return T t
*/
public T findValue(JsonNode jsonNode, String fieldName, JavaType javaType, ObjectMapper mapper) {
if (jsonNode == null) {
return null;
}
JsonNode value = jsonNode.findValue(fieldName);
return (value != null && value.isContainerNode()) ? mapper.convertValue(value, javaType) : null;
}
/**
* 获取json字符串的第一个子节点 从json串中自顶向下依次查找第一个出现的节点 {example { "c": "1", "a": "2", "b": {"c":
* 3} } getNodeFirst(json,"c")==>1
*
* { "c": "1", "a": "2", "b": {"c": 3,"d":4}, "d": 5 } getNodeFirst(json,"d")==>4}
* @param jsonNode json
* @param nodeName node
* @return str node first
* @see JsonNode#at(String)
* @see JsonNode#at(JsonPointer)
* @see JsonNode#findValue(String)
*/
@Deprecated(since = "1.3.3", forRemoval = true)
public JsonNode findNodeFirst(JsonNode jsonNode, String nodeName) {
if (jsonNode == null || ObjectUtils.isEmpty(nodeName)) {
return null;
}
if (jsonNode.isArray()) {
Iterator elements = jsonNode.elements();
while (elements.hasNext()) {
JsonNode result = findNodeFirst(elements.next(), nodeName);
if (result != null) {
return result;
}
}
}
else {
Iterator iterator = jsonNode.fieldNames();
while (iterator.hasNext()) {
String node = iterator.next();
if (node.equals(nodeName)) {
return jsonNode.get(nodeName);
}
else {
JsonNode child = jsonNode.get(node);
if (child.isContainerNode()) {
JsonNode result = findNodeFirst(child, nodeName);
if (result != null) {
return result;
}
}
}
}
}
return null;
}
/**
* 获取所有节点为nodeName的数据
* @param jsonNode json
* @param nodeName name
* @return list
*/
@Deprecated(since = "1.3.3", forRemoval = true)
public List findNodeAll(JsonNode jsonNode, String nodeName) {
if (jsonNode == null || ObjectUtils.isEmpty(nodeName)) {
return Collections.emptyList();
}
List jsonNodeList = new ArrayList<>();
if (jsonNode.isArray()) {
Iterator elements = jsonNode.elements();
while (elements.hasNext()) {
List firstAll = findNodeAll(elements.next(), nodeName);
jsonNodeList.addAll(firstAll);
}
}
else {
Iterator iterator = jsonNode.fieldNames();
while (iterator.hasNext()) {
String node = iterator.next();
if (node.equals(nodeName)) {
jsonNodeList.add(jsonNode.get(nodeName));
}
else {
JsonNode child = jsonNode.get(node);
if (child.isContainerNode()) {
List firstAll = findNodeAll(child, nodeName);
jsonNodeList.addAll(firstAll);
}
}
}
}
return jsonNodeList;
}
/**
* 获取json字符串的节点 {example { "c": "1", "a": "2", "b": { "c": 3, "d": { "ab": 6 } } }
* getNode(json, "b"))==>{"c":3,"d":{"ab":6}} getNode(json, "b.c"))==>3 getNode(json,
* "b.d"))==>{"ab":6} getNode(json, "b.d.ab"))==>6 getNode(json, "d"))==>null}
* @param jsonNode json
* @param nodePath node(节点之间以.隔开)
* @return node node
* @see JsonNode#at(String)
* @see JsonNode#at(JsonPointer)
*/
@Deprecated(since = "1.3.3", forRemoval = true)
public JsonNode findNode(JsonNode jsonNode, String nodePath) {
if (jsonNode == null || ObjectUtils.isEmpty(nodePath)) {
return null;
}
int index = nodePath.indexOf('.');
if (jsonNode.isArray()) {
int range = Integer.parseInt(nodePath.substring(0, index));
Iterator elements = jsonNode.elements();
JsonNode node = Streams.stream(elements).toList().get(range);
return findNode(node, nodePath.substring(index + 1));
}
else {
Iterator iterator = jsonNode.fieldNames();
while (iterator.hasNext()) {
String node = iterator.next();
if (index <= 0) {
if (node.equals(nodePath)) {
return jsonNode.get(nodePath);
}
}
else {
String parentNode = nodePath.substring(0, index);
if (node.equals(parentNode)) {
JsonNode child = jsonNode.get(node);
if (child.isContainerNode()) {
String childNode = nodePath.substring(index + 1);
JsonNode result = findNode(child, childNode);
if (result != null) {
return result;
}
}
}
}
}
}
return null;
}
}