Js解析Json数据获取元素JsonPath与深度
JsonPath 是⼀种信息抽取类库，是从JSON⽂档中抽取指定信息的⼯具，提供多种语⾔实现版本，包括：Javascript, Python， PHP 和 Java，JsonPath 对于JSON 来说，相当于 XPATH 对于 XML。
（⼀）JsonPath与Xpath⽤法对⽐
（⼆）Java使⽤Jsonpath解析json数据
（三）Js获取Json每个节点的JsonPath
文本编辑器哪个好用知乎（四）将输出结果转换成树形结构
JsonPath与Xpath⽤法对⽐
XPathJSONPath描述
/$根节点
.@现⾏节点
/.or[]取⼦节点
..n/a取⽗节点，Jsonpath未⽀持
//..就是不管位置，选择所有符合条件的条件全球新冠确诊病例累计超635229101
**匹配所有元素节点
@n/a根据属性访问，Json不⽀持，因为Json是个Key-value递归结构，不需要。
[][]迭代器标⽰（可以在⾥边做简单的迭代操作，如数组下标，根据内容选值等）
|[,]⽀持迭代器中做多选。
[]?()⽀持过滤操作.
n/a()⽀持表达式计算
()n/a分组，JsonPath不⽀持
Java使⽤Jsonpath解析json数据
引⼊fastjson依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.6</version>
</dependency>
java简单的解析案例
public class JsonPath {
public static void main(String[] args) {
String jsonStr = "{\n" +
"  \"store\": {\n" +
"    \"book\": [\n" +
"      {\n" +
"        \"category\": \"reference\",\n" +
"        \"author\": \"Nigel Rees\",\n" +
"        \"title\": \"Sayings of the Century\",\n" +
"        \"price\": 8.95\n" +
"      },\n" +
"      {\n" +
"        \"category\": \"fiction\",\n" +
"        \"author\": \"Evelyn Waugh\",\n" +
"        \"title\": \"Sword of Honour\",\n" +
"        \"price\": 12.99,\n" +
"        \"isbn\": \"0-553-21311-3\"\n" +
"      }\n" +
"      {\n" +
"        \"category\": \"fiction\",\n" +
"        \"author\": \"Evelyn Waugh\",\n" +
"        \"title\": \"Sword of Honour two\",\n" +
"        \"price\": 12.99,\n" +
"        \"isbn\": \"0-553-21311-3\"\n" +
"      }\n" +
"    ],\n" +
"    \"bicycle\": {\n" +
"      \"color\": \"red\",\n" +
"      \"price\": 19.95\n" +
"    }\n" +
"  }\n" +
"}";
JSONObject jsonObject = JSON.parseObject(jsonStr);
手游发卡网System.out.println("Book：" + JSONPath.eval(jsonObject, "$.store.book"));
System.out.println("Book数⽬：" + JSONPath.eval(jsonObject, "$.store.book.size()"));
System.out.println("第⼀本书title：" + JSONPath.eval(jsonObject, "$.store.book[0].title"));
System.out.println("price⼤于10元的book：" + JSONPath.eval(jsonObject, "$.store.book[price > 10]"));
System.out.println("price⼤于10元的title：" + JSONPath.eval(jsonObject, "$.store.book[price > 10][0].title"));
System.out.println("price⼤于10元的title：" + JSONPath.eval(jsonObject, "$.store.book[price > 10][1].title"));
System.out.println("category(类别)为fiction(⼩说)的book：" + JSONPath.eval(jsonObject, "$.store.book[category = 'fiction']"));
System.out.println("bicycle的所有属性值" + JSONPath.eval(jsonObject, "$.store.bicycle.*"));
System.out.println("bicycle的color和price属性值" + JSONPath.eval(jsonObject, "$.store.bicycle['color','price']"));    }
Js获取Json每个节点的JsonPath
准备json测试数据
var root = {
name: '测试节点',
doms: {
name: "dom测试",
children: [
{
name: '茶馆',
val: 'demo',
child: [
{"name": "李四", "cal": "ceshi"}, {"name": "王五", "cal": "ceshi"}
]
},
{
name: '红与⿊',
val: 'demo',
child: [
{"name": "张三", "cal": "ceshi"}, {"name": "张三", "cal": "ceshi"}
]
}
]
},
children: [
{
name: '学习',
children: []
},
{
name: '电影',
children: [
{
name: '喜剧电影'
},
{
name: '动作电影'
}
]
}
]
}
遍历Json对象获取每个节点的深度与JsonPath
function traverseTree(node, flat) {
var stack = [], res = [];
if (!node) return;
stack.push({"dom": node, "dep": 0, "path": "$", "name": "根节点"});
var tmpNode;
while (stack.length > 0) {
tmpNode = stack.pop();
res.push({
"name": tmpNode.name,
"pid": tmpNode.pid,
"path": tmpNode.path,
"dep": tmpNode.dep
});
traverseNode2(tmpNode, tmpNode.dep);
}
// 遍历单个节点
function traverseNode2(node, dep) {
var doc = node.dom;
if (String.call(doc) === '[object Object]') {
for (var val in doc) {
var cpath = (node.path + "." + val);
stack.push({
"dom": doc[val],
"dep": (dep + 1),
"path": cpath,
"pid": node.path,
"name": val
});
}
}
if (String.call(doc) === '[object Array]') {
for (let i = 0; i < doc.length; i++) {
stack.push({
"dom": doc[i],
"dep": (dep + 1),
"path": (node.path + "[" + i + "]"),
"pid": node.path,
"name": node.name + "[" + i + "]"
});
}
}
}
// 树形结构转换
function flat2tree(jsonData) {
var result = [], temp = {}, i = 0, j = 0, len = jsonData.length;
for (; i < len; i++)
temp[jsonData[i]['path']] = jsonData[i]
for (; j < len; j++) {
var cel = jsonData[j]
var tcel = temp[cel['pid']]
if (tcel) {
if (!tcel['children']) {
tcel['children'] = [];
}
tcel['children'].push(cel)
} else {
result.push(cel);
}
}
return result;
}
return flat ? flat2tree(res) : res;
}
测试输出
console.log("res-tree:\n" + JSON.stringify(traverseTree(root, false))); res-tree:
[
{
"name":"根节点",
"path":"$",
"dep":0
},
{
"name":"children",
"pid":"$",
"path":"$.children",
"dep":1
},
变量名的命名规则和使用{
"name":"children[1]",
"pid":"$.children",
"path":"$.children[1]",
"dep":2
},
{
"name":"children",
"pid":"$.children[1]",
"path":"$.children[1].children",
"dep":3
},
{
"name":"children[1]",
"pid":"$.children[1].children",
"path":"$.children[1].children[1]",
"dep":4
},
python解析json文件
{
"name":"name",
"pid":"$.children[1].children[1]",
"path":"$.children[1].children[1].name",
"dep":5
},
{
"name":"children[0]",
"pid":"$.children[1].children",
"path":"$.children[1].children[0]",
"dep":4
},
{
"name":"name",
"pid":"$.children[1].children[0]",
"path":"$.children[1].children[0].name",        "dep":5
},
{
"name":"name",
"pid":"$.children[1]",
"path":"$.children[1].name",
"dep":3
},
{
"name":"children[0]",
"pid":"$.children",
"path":"$.children[0]",
"dep":2
},
{
"name":"children",
"pid":"$.children[0]",
"path":"$.children[0].children",
"dep":3
},
{
"name":"name",
"pid":"$.children[0]",
"path":"$.children[0].name",
"dep":3
},
{
"name":"doms",
"pid":"$",
"path":"$.doms",
"dep":1
},
{
"name":"children",
"pid":"$.doms",
"path":"$.doms.children",
"dep":2
},
{
"name":"children[1]",
"pid":"$.doms.children",
"path":"$.doms.children[1]",
"dep":3
},
{
"name":"child",
"pid":"$.doms.children[1]",
"path":"$.doms.children[1].child",
"dep":4
},
{
"name":"child[1]",
"pid":"$.doms.children[1].child",
"path":"$.doms.children[1].child[1]",
"dep":5
},
{
"name":"cal",
"pid":"$.doms.children[1].child[1]",
"path":"$.doms.children[1].child[1].cal",        "dep":6
},
{
"name":"name",
"pid":"$.doms.children[1].child[1]",
"path":"$.doms.children[1].child[1].name",        "dep":6
},
{
"name":"child[0]",
"pid":"$.doms.children[1].child",
"path":"$.doms.children[1].child[0]",
"dep":5
},
{
"name":"cal",
"pid":"$.doms.children[1].child[0]",
"path":"$.doms.children[1].child[0].cal",
"dep":6
},
{
"name":"name",
"pid":"$.doms.children[1].child[0]",
"path":"$.doms.children[1].child[0].name",        "dep":6
},
{
"name":"val",
"pid":"$.doms.children[1]",
"path":"$.doms.children[1].val",
"dep":4
},
{
"name":"name",
"pid":"$.doms.children[1]",
"path":"$.doms.children[1].name",
"dep":4
},
{
"name":"children[0]",
"pid":"$.doms.children",
"path":"$.doms.children[0]",
"dep":3
},
{
"name":"child",
"pid":"$.doms.children[0]",
"path":"$.doms.children[0].child",
"dep":4
},
{
"name":"child[1]",
"pid":"$.doms.children[0].child",
"path":"$.doms.children[0].child[1]",
"dep":5
},
{
"name":"cal",
"pid":"$.doms.children[0].child[1]",
"path":"$.doms.children[0].child[1].cal",        "dep":6
},
{
"name":"name",
"pid":"$.doms.children[0].child[1]",
"path":"$.doms.children[0].child[1].name",        "dep":6
},
{
"name":"child[0]",
"pid":"$.doms.children[0].child",
"path":"$.doms.children[0].child[0]",jfreechart图表
"dep":5
},
{
"name":"cal",
"pid":"$.doms.children[0].child[0]",
"path":"$.doms.children[0].child[0].cal",        "dep":6
},
{
"name":"name",
"pid":"$.doms.children[0].child[0]",
"path":"$.doms.children[0].child[0].name",        "dep":6
},
{
"name":"val",
"pid":"$.doms.children[0]",
"path":"$.doms.children[0].val",
"dep":4
},
{
"name":"name",
"pid":"$.doms.children[0]",
"path":"$.doms.children[0].name",
"dep":4

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