gjson

GJSONGojson
SJSON jsonJJ
GJSONGJSON

github 的地址在这里。

安装

gjsongo

go install github.com/tidwall/gjson@latest

在文件的目录下执行:

$ go get -u github.com/tidwall/gjson

gjson

使用

获取相应的数值。

json
package main
import "github.com/tidwall/gjson"
const json = `{"name":{"first":"Janet","last":"Prichard"},"age":47}`
func main() {
	value := gjson.Get(json, "name.last")
	println(value.String())
}

这将打印:

Prichard

jsongjsonjson

路径语法

路径是由点分隔的一系列键。密钥可能包含特殊的通配符“*”和“?”。要访问数组值,请使用索引作为键。要获取数组中的元素数量或访问子路径,请使用“#”字符。点和通配符可以用“\”转义。

{
  "name": {"first": "Tom", "last": "Anderson"},
  "age":37,
  "children": ["Sara","Alex","Jack"],
  "fav.movie": "Deer Hunter",
  "friends": [
    {"first": "Dale", "last": "Murphy", "age": 44, "nets": ["ig", "fb", "tw"]},
    {"first": "Roger", "last": "Craig", "age": 68, "nets": ["fb", "tw"]},
    {"first": "Jane", "last": "Murphy", "age": 47, "nets": ["ig", "tw"]}
  ]
}

"name.last"          >> "Anderson"
"age"                >> 37
"children"           >> ["Sara","Alex","Jack"]
"children.#"         >> 3
"children.1"         >> "Alex"
"child*.2"           >> "Jack"
"c?ildren.0"         >> "Sara"
"fav\.movie"         >> "Deer Hunter"
"friends.#.first"    >> ["Dale","Roger","Jane"]
"friends.1.last"     >> "Craig"

您还可以使用 查询数组中的第一个匹配项#(…),或使用 查找所有匹配项#(…)#。查询支持==, !=, <, <=, >,>= 比较运算符和简单的模式匹配%(like) 和!% (not like) 运算符。

friends.#(last=="Murphy").first    >> "Dale"
friends.#(last=="Murphy")#.first   >> ["Dale","Jane"]
friends.#(age>45)#.last            >> ["Craig","Murphy"]
friends.#(first%"D*").last         >> "Murphy"
friends.#(first!%"D*").last        >> "Craig"
friends.#(nets.#(=="fb"))#.first   >> ["Dale","Roger"]

这样我们查找起来就非常方便了。